Model 232BOB1 Document 232BOB15299 This product Designed Man

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RS-232 BreakOut
Model 232BOB1
Document 232BOB15299
This product Designed Manufactured domestic imported parts
International Headquarters
Electronics Mfg. Inc. Dayton Road P.O. 1040 Ottawa, 61350 Phone (815) 433-5100 General (815) 433-5105 Home Page: www.bb-elec.com Sales e-mail: sales@bb-elec.com (815) 433-5109 Technical Support e-mail: support@bb.elec.com (815) 433-5104
European Headquarters
Electronics Ltd. Westlink Commercial Park, Oranmore, Galway, Ireland Phone +353 792444 +353 792445 Home Page: www.bb-europe.com Sales e-mail: sales@bb-europe.com Technical Support e-mail: support@bb-europe.com
1993 Electronics Revised January 2000
November 5299 Electronics RESERVED.
part this publication reproduced transmitted form means, electronic mechanical, including photography, recording, information storage retrieval system without written consent. Information this manual subject change without notice, does represent commitment part Electronics. Electronics shall liable incidental consequential damages resulting from furnishing, performance, this manual. brand names used this manual registered trademarks their respective owners. trademarks other designations this publication reference purposes only does constitute endorsement trademark holder.
232BOB15299 Manual
Cover Page
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
Table Contents
INTRODUCTION BITS, BYTES, VOLTAGES.3 TALKING OUTSIDE WORLD PLUG RECEPTACLES: First Incompatability.6 ASSIGNMENTS: Second Incompatability DIFFERENCE BETWEEN CONTROL SIGNALS DATA SIGNALS.9 RS-232D PINS ASSIGNMENTS IMPORTANCE SOFTWARE SUCCESSFULLY CONNECT RS-232 DEVICES GENERAL CONSIDERATIONS.16 BREAK-OUT INTERFACE.20 DECLARATION CONFORMITY .A-1
232BOB15299 Manual
Table Contents
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
INTRODUCTION
RS-232D Standard guidelines specifying pieces computer equipment should cabled together that they communicate certain way. problem with this standard that "standard" all. isn't standard same sense that American television signals, records, alternating current that flows from typical wall socket are. "Recommended Standard Number 232, Revision defined promulgated Electronics Industry Association (EIA), something that simply scrupulously followed manufacturers printers, computer terminals, graphic plotters, data acquisition equipment, other gear that sold "RS-232D compatible." Most standards, like those cited above, crisp, clear, uncompromising snapshot. unit either compatible with standard not, it's not, doesn't work. Period. Record appliance manufacturers aren't fools. result, record played turntable, everything from radial food processor will spring life when plugged into electrical outlet anywhere country. can't every matrix letter-quality printer behave same when plugged into personnel computer? fair that more hours have been wasted over apparently simple task getting Computer talk Printer than over other problem personal computing. What this means that whether dealer, user, corporate information center, anyone else, connect "RS-232 compatible" devices are, fact, embarking upon veritable magical mystery tour conflicting interfaces creative wiring. must first figure what each device doing with pins sockets that compose RS-232 interface. Then must figure build specify cable that fiddles with those pins that successfully mates machines.
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
Break-Out help both phases operation. you're experienced this sort thing, might want skip ahead step-by-step instructions presented later this manual. serial communications you, stick around we'll can't bring some order chaos RS232 "Standard" give background information need solve almost machine mating puzzle.
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
BITS, BYTES, VOLTAGES
first thing need know that computers communicate "bits", term that short "binary digits." Just bicycle wheels, binary digit forms. Both them electrical, course, variously described OFF, LOW, SPACE MARK, purposes, we'll think bits physical level, that different electrical voltages, each which exists wire other conductor certain number microseconds. electricity lifeblood personal computer, bits white corpuscles. They constantly whizzing around inside system, even when isn't doing anything particular. unlike corpuscles, bits don't whiz random. They are, computer, means communication with separate parts. When computer wants disk drives come example, pattern bits dispatched carry message circuit board that controls disk drive, instantly drive turned Other patterns, fired other sections system, control other operations. next thing that need know that virtually micro personnel computers, eight bits required send message. bits required send message. bits given message depart arrive same time. other words, bits travel groupings eight they travel abreast. make possible bits travel this fashion, internal components most computers typically connected electrical highways. Think highways wires imagine them running between Point Point within machine you'll begin picture. Naturally, highways "wires" parallel. that, haven't guessed already, this arrangement called "parallel communications".
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
TALKING OUTSIDE WORLD
Personal computers similar devices could communicate with external devices eight-bit-at-a-time parallel communications. fact, many them parallel printer example, expects receive information from attached computer eight-bit chunks, with each chunk byte arriving same time. course, order this happen, cable with minimum nine wires must used connect computer printer. need wire each eight bits wire serve circuit common ("signal ground," "common return"). Cables like these have advantage letting computer communicate with external device almost quickly communicates with disk drives other internal components. While they normally cheap, short runs (1.5 meters, five feet) parallel cables exorbitant. Longer distances, however, another matter. cost running least nine wires from device another mount quickly distance increases. That's just one-way communication. want device-to-device conversation flow both directions, even more wires will required cable cost will rise even faster. Small wonder then that host modern technologies (coaxial cable, multiplexed signals, fiber optic data pipes, etc.) have been developed around this problem. However, when RS-232 Standard developed (1969) there really only inexpensive alternative, so-called "twisted-pair" wires used phone system. dispose relatively complicated problem eight-bit units over two-wire cable very simply: ultimately microchip invented handle job. chip called UART (UNIVERSAL ASYCHRONOUS RECEIVER/TRANSMITTER). UARTs supplied different chip companies have different capabilities. essence, they same thing. Imagine military drill team eight-abreast formation with each facing north. UART gives command bits begin marking time. Another command rightmost remains same spot while bits left march forward begin swing their around like garden gate clock's secondhand moving from nine noon. When "secondhand" reaches twelve, bits stop execute left-face that when they finish, everyone facing north twelve o'clock. 232BOB15299 Manual
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issuing these commands, UART changed arrangement bits from "parallel" into "serial." still move this squad from machine another, each will depart arrive after other, "series", instead eight once. will take eight times longer transfer single byte from machine other, only wires (one bits serve circuit common) will needed bring off. Because electro-mechanical devices like printers slow compared computers, time difference probably won't factor, external device expects receive bits series, you'll rarely notice difference. complete analogy, assume that each team wears either green helmet. Green means that negative voltage (sometimes called "mark" "LO"). means that positive voltage ("space" "HI"). arrangement bits each eight-bit squad (byte) that significant both sender receiver this they tell them apart.
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
PLUG RECEPTACLES: First Incompatability
we've said, successful one-way serial connection made with only wires: sending data serve circuit common. Campbell points book, "The RS232 Solution", "The circuit common often erroneously called 'circuit ground.' absolutely nothing with ground earth. just absolute voltage reference interface circuitry, point circuit from which voltages measured." Successful two-way connections that allow both devices send receive information made adding just other wire, total three. variety reasons, three wires usually aren't enough. Indeed, RS-232 Standard provides total wires specifies which signals should sent each. Originally, RS-232 Standard said nothing about physical dimensions plugs receptacles used connect machines. Equipment manufacturers were free make them they wanted. Most settled DB-25 connector. latest version standard, RS-232D incorporates that connector. However, worth pointing that presence DB-25 connector does automatically mean serial, RS-232 connection. PCs, example, parallel connector. Conversely, absence familiar DB-25 does mean that connection RS-232 serial. example, some equipment round plugs. Plug problems first incompatibility encounter. While they nearly widespread other forms incompatibility, they first point should check. find that RS-232 compatible device sports non-DB-25 connector, contact your dealer cable that will plug into device terminate DB-25 connector. Note that DB-25 connectors come sexes-male (the with pins) female (the with receptacle holes). both devices male both female, Electronics tools need perform "sex change operation". These Gender Reversers, they available males female connectors. Male/male female/female cables also available meter (six ft.) meter (ten ft.) lengths.
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
ASSIGNMENTS: Second Incompatability
this point, know need minimum pins wires) one-way communication three pins connection which both devices send receive information. Fortunately, almost manufacturers obey RS-232 Standard regarding which pins should given these assignments. almost always circuit common, while used transmit data used receive that were that were necessary, connecting machines would relatively simple matter making sure that "wired straight through" (both connected each other) that sending device connected receiving other device. Sometimes connection like that will work perfectly you'll have need other available pins. more often than not, this isn't case. typical computer-toprinter connection makes easy why. computer "terminal" ability send information piece peripheral equipment almost fast speed electricity. printer labors under significant handicap-each time byte comes from computer must physically move printing element make mark piece paper. Consequently, printers cannot accept information anywhere near speed with which computers capable sending computer terminal doesn't know this course. knows that information send printer, it's going send Left own, computer would send, send, send. very short while, small reception room ("printer buffer") most printers maintain incoming information, would overflow. Still, incoming information flow would continue. printer could easily choked this deluge stop working. Unable keep with flow turn your letter into much garbled scratching. obvious solution make possible printer issue some sort control signal computer terminal saying "Hold minute, will you! Just stop sending until this last characters printed." Once characters have been dealt with, printer must able say, "All right, send some more characters print." Likewise, necessary desirable have printer send signal indicating that powered ready work 232BOB15299 Manual
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powered down, "offline," otherwise duty), paper, need ribbon, something else. Modems, plotters, laboratory instruments, tape drives, need exchange additional non-data signals with computers that control them. computers themselves need exchange such signals with their peripherals. With nearly pins play with, equipment designer enough capacity implement such signals content. Many have done exactly that, ignoring what RS-232 Standard about which signals should carried which pins. people write software control interfaces have been similarly creative. equipment designers software code writers this approach perfectly justifiable. RS-232 Standard, many would point out, written purpose only: facilitate connection Data Terminal Equipment (computers) with Data Communications Equipment (modems). you're making that kind connection, then bets off. standard doesn't apply. pins, UART, circuitry there, shouldn't them? Justifiable not, result untold confusion frustration part anyone would connect Brand computer Brand printer other serial device.
232BOB15299 Manual
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DIFFERENCE BETWEEN CONTROL SIGNALS DATA SIGNALS
signals we've been talking about referred with terms like "flow control," "device control," "control logic," "handshaking" signals. this point there need that specific. Instead, we'll refer such signals control signals. Though they employ same voltage levels used data pins (pins control signals voltages different purpose different way. instance, printer ready receive data, signal that fact computer putting positive voltage Sensing this, computer will begin dump data printer will continue long carries positive voltage. printer's buffer begins fill, will realize that must tell computer temporarily stop sending characters. will negative voltage keep there until ready accept more characters. computer will respond refusing send more characters until once again seen carry positive voltage, signaling that printer once again ready accept data. other words, control signals, unlike data signals, rapidly change from voltage another. They thus more like traffic lights than strobe lights. computer parlance, positive voltage control signals said "asserted" "enable." Positive signals cause indicator light equipment glow red, while negative signals cause them grow green.
232BOB15299 Manual
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RS-232D PINS ASSIGNMENTS
Take good look following list pins assignments specified RS-232 Standard. Then read text that follows.
Protective Ground Transmit Data Receive Data Request Send Clear Send Data Ready Circuit Common Carrier Detect (Reserved Testing) (Reserved Testing) Assigned Secondary Carrier Detect Secondary Clear Send Secondary Transmit Data Transmission Signal Timing Secondary Receive Data Receiver Signal Timing Assigned Secondary Request Send Data Terminal Ready Signal Quality Detector Ring Indicator Data Rate Selector Transmission Signal Timing Assigned
pins listed above, most cases, you'll only have concerned with seven eight. Here main pins most people will have deal with, accompanied their data communications shorthand abbreviations parentheses:
Transmit Data TxD) Receive Data RxD) Request Send (RTS) Clear Send (CTS) Data Ready (DSR) Circuit Common Signal Ground (SG) Carrier Detect DCD) Data Terminal Ready (DTR)
these, already know that carrying signal that others reference point, must wired straight 232BOB15299 Manual
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through. also know that each Break-Out Box's receiving must connected other Break-Out Box's sending pin. That leaves following control signals:
Request Send (RTS) Clear Send (CTS) Data Ready (DSR) Data Terminal Ready (DTR) Carrier Detect DCD)
Naturally, it's accident that we've presented first four signals pairs. almost every case, existence implies existence mate same interface. another way, plug your computer into Break-Out notice that (Request Send) lights that (Clear Send) also "active" your computer concerned, even though lamp moment. Your computer will almost certainly wired that expects receive signal before hands over data peripheral device. same points apply Data Ready/Data Terminal Ready pair pins active, mate active well. terms "data set" "data terminal" reflect RS-232 Standard. Carrier Detect, signal carried something loner. John McNamera says book, "Technical Aspects Data Communication (Digital Equipment Corporation, 1977)," additional lead called "Received line signal detect" "carrier detect" following function. when asserted indicates that receiver section modem receiving tones from distant modem." (The pin's signal also called "Data Carrier Detect"). This means that your modem distant modem will probably able lock onto each other thus facilitate data communications between your computer remote systems.
232BOB15299 Manual
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since carrier involved computer, printer similar hook-ups, "carrier detect" meaning. Thus equipment designers free some other purpose. sometimes used, example, disable receiving section UART chip much same that (Clear Send) disables transmitting section same chip.
232BOB15299 Manual
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IMPORTANCE SOFTWARE
Whether embedded microchips "firmware" loaded into memory from disk, each time power turned system re-set, software controls virtually every aspect computer's operations. software that "initializes" (prepares activates) computer's serial port, UART, RS-232 interface. software that determines fast data will sent received. software that often controls whether data will sent not. software exerts control monitoring status various pins interface responding accordingly. example, software will more than likely keep (Data Ready) RS-232 interface. that carries negative voltage, software will undoubtedly refuse allow UART send characters peripheral. Only when sees high (positive voltage) signaling that "data set" ready will allow transmission proceed. sensible program monitor virtually control signals we've been discussing. Where things complicated when program monitors additional pins well. example, might very well word processing program your computer with ability send text your serial printer. That program might monitor only pins cited above, (secondary request send) well. might this because expects receive signal that line your printer runs paper. Should that happen, program would then stop sending text printer. only problem this: Suppose you're using printer that doesn't send anything Suppose that your printer concerned, doesn't even exist? that's case, your word processing software will probably refuse print anything all. different word processing program, however, might care about start dumping text same printer like mad.
232BOB15299 Manual
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Similarly, most communications programs will refuse send data modem there isn't positive voltage (Carrier Detect). you're using inexpensively built modem, BreakOut send anything send incorrect signals. Either way, won't able communicate. both cases, demands software crucial success your interface. both cases, problems solved first identifying pins involved then cross-wiring them appropriate mates.
232BOB15299 Manual
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SUCCESSFULLY CONNECT RS-232 DEVICES
We're ready move into actual interfacing process. this point seems worthwhile point that time trying solve computer related problem, essential adopt patient, methodical approach. mental attitude characterized "Zen RS-232 Interfacing" might appropriate well. otherwise your personal sanity line with odds overwhelming house's favor. Take first step first, second step second. Don't omit steps. make careful notes results everything try. Your ultimate goal creation cable jumper that will successfully link "RS-232 compatible" devices that each functions intended function, regardless design manufacturer device other line. build this cable jumper box, instruct others should built, must first discover which RS-232 pins have cross-wired, jumpered, disconnected, otherwise fiddled with make successful connection. Break-Out your primary diagnostic tool this endeavor. course obtain materials need build custom cables jumper boxes from well.
232BOB15299 Manual
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GENERAL CONSIDERATIONS
There things aware before beginning process. first these that voltages we'll dealing with will harm RS-232 interface. According standard, positive voltage must somewhere range volts; negative voltages must range from volts. standard stipulates, RS-232 interfaces designed "withstand open circuit, short circuit," cross-connection "without sustaining damage itself associated equipment." other words, long devices RS-232 interfaces, connect other time without causing your circuit boards melt. goes without saying that must make sure that both interfaces indeed RS-232, regardless what their plugs receptacles look like.) Secondly, voltages RS-232 pins freely "borrowed." interface designed connect more than input single output thus share output pin's voltage. This means that your computer software needs signal particular that your printer other peripheral does supply, connect that that printer does actively use. This called "jumpering" "strapping" another. results "pulling formally inactive supplying with some form voltage. Thirdly, while (the circuit common that everything else uses reference) should always connected straight through, want connect protective ground, through. This supposed eventually lead back through machines round prong their power cords from there through building's electrical system reaches earth. private home, this isn't likely cause problem. office building with far-flung electrical system result electrical differences between machine bodies that prevent communication. Campbell points book mentioned earlier, under ordinary circumstances, more likely induce problems connecting your peripherals behave possessed, check your cables connected able exorcise ghosts spirits simply snipping case, RS-232D Standard, optional." Finally, read your hardware manuals will undoubtedly come across terms Data Terminal Equipment (DTE) Data 232BOB15299 Manual
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Communications Equipment (DCE). know what they are, certain that terms were created information theory specialist. There virtually determine what they signify from words alone. Data Terminal Equipment your computer. Data Communications Equipment your modem. surprisingly, RS-232 interface "terminal" designed mate with interface modem. This means that computer's information-sending connected modem's informationreceiving pin, example, with other mating pins discussed earlier. other words, since plugs receptacles interface already this way, cross-wiring necessary. That's terms still relevant, even don't have modem. They used refer interfaces that wired like modem's RS-232 interface wired like computer terminal's RS-232 interface.
232BOB15299 Manual
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BREAK-OUT
Preliminary step familiarize yourself with Break-Out Break-Out male DB-25 connector side female other. columns (Dual In-line Package) switches stand between these connectors, making possible selectively connect pins either side. small screw driver ball-point ideal tool this. Note that when switches "ON" signals will flow from whatever plugged into right side Break-Out left side. Note, too, that numbers printed switches themselves should ignored. only numbers printed white Break-Out determine which switch governs which receptacle. Next, should look twelve indicator bulbs. Break-Out contains pins There also indicators labeled "SPARE." These indicators glow GREEN when there negative voltage their respective pins when voltage positive.
232BOB15299 Manual
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Note that numbers label under their respective LEDs. bottom LEDs SPAREs. SPARE LEDs, connect strips (two pin-) that located right below next them. three strips that located above below switches patching. three pins connected each other where else. spare LEDs important because while most serial interfaces limit themselves pins cited above, some activate other pins well. active output, jumper wire into spare receptacles touch each others jumper receptacle turn. spare lights when touch receptacle example, know that interface makes some that pin.
232BOB15299 Manual
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INTERFAThe following general procedure should follow whenever want RS-232D devices live their billing "compatible." Step Make sure communications parameters match. Communications parameters covered this manual, they should covered manuals that came with your equipment. they're not, will find complete explanation Alfred Glossbrenner's "Complete Handbook Personal Computer Communications." Actually, important thing much know what "baud," "parity," "stop bits," "character length" (also known word length number data bits) mean make sure that these settings match exactly both pieces equipment. Mismatched communications settings cause even properly wired RS-232 connection fail pass data. Step Load actual software will using day. mentioned earlier, different programs treat pins RS-232 interface differently. (One program expect signal that some other program ignores, etc.) Consequently, only makes good sense load software will actually using (communications program, word processing program, whatever) your day-to-day work match interface requirements. most cases, interface program will probably work programs, important aware that this always case. Step Quick Fix. most common interfacing problems results when both machines wired like "terminals" (DTE). best example would RS-232 communications ports computers. almost every case, both will plugged into modem (DCE). That means they will both sending data expect receive data make them talk each other, these other relevant pins must switched that each computer thinks that talking modem (DCE). This situation common that companies like Electronics sell null modems reversers (also called "crossover cables" "modem eliminators") that have been pre-wired make switch. mentioned earlier, sells null modem plugs. before buying one, even feel strongly that null modem connection what need, plug each cable into Break-Out 232BOB15299 Manual
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(Transmit Data) lights lights both cases then pretty certain that null modem will trick. lights case other, null modem will good, skip ahead next step. (Receive Data) lights both cases also need null modem. Break-Out null modem, begin turning switches Break-Out "open") except Then supplied jumper cables crossover following pins: Left Side Right Side: 6.20 20.6 Next, plug each machine's cable into DB-25 connectors Break-Out Box, send some characters from machine another. successful, transmitting five more pages text from machine other. this does work, verify once again that your communications parameters both machines match again. Quick going work, will work now. does work, remove Break-Out Box's wires, ponder kaon your choosing. might also help roll your sleeves since it's time ready some real work. Step Examine cable. good idea this point physically check wiring DB-25 connectors cable supplied with your equipment. Since connectors contain pins, look connector which pins present. Make note that fact since, they're present, they probably active.
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Even DB-25 connectors that contain pins holes) there's good chance that connected from cable other. check this, remove shell your DB-25 connector. can, able exactly which pins receptacles connected cable. Again, this information important clue. find that pins wired together within connector, certain make note since this kind information invaluable later on.) cannot remove connector shell, still test cable using continuity tester (available your local hardware store). Hold ends cable side-by-side, then test each corresponding receptacle hole pin) other cable. continuity tester lights will know that connected straight through cable. Again, take notes which pins connected. Though probably will case, discover that continuity tester does come when testing receptacle your cable, testing receptacle tester comes almost certainly have null modem cable. Since such cable intended with some device other than want connect this time, need different cable rewire have. Step Determine which pins active each interface. Though necessary, idea this point start fresh have previously fiddled with interface this session. Reboot your computer reload necessary software. Verify that applicable communications parameter settings match. will using communications package (terminal software) your computer, sure that loaded terminal mode (ready communicate). trying connect printer, turn moment clear signals that have been caught circuitry, turn again. Then make sure that "on-line" mode (ready receive data from computer). other words, regardless equipment using, make certain that active mode such that proper RS-232 interface exist, would perform functions supposed Break-Out determine which pins active each RS-232 interface. Plug machine's interface into 232BOB15299 Manual
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Break-Out look which lights come Write name device ("printer," "terminal," "tape drive," etc.) start column piece paper. Make note each that lights what color appears. green light means that carrying negative voltage, means positive. Note that data pins will glow green. RS-232 Standard specifies that, when their idle state, these pins must hold negative voltage. some older communications manuals, this called MARKING. SPACE term used refer momentary positive voltage that appears line when positive transmitted received.) ones used carry control signals, negative voltage means that control signal inhibited this time; means being asserted. Next insert jumper into "Spare" jumper sockets touch each jumper holes that have their bulb turn. them cause "Spare" light, write down number bulb color column. Unplug first machine plug second. Repeat above procedure begin column notes second machine next first. Step Which pins natural mates interfaces. will have preliminary indication requirements interfaces. Review your notes. Which pins first column natural mate listed second column? Remember, pins pins pins natural mates. Draw lines between numbers each column natural mate. Step Which pins remain? Review your notes again check pins that same both devices. What pins remain each list? That which pins unique interface each device?
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This, they say, where begins. best possible worlds, there wouldn't unique pins. second best possible worlds, unique pins will side interface. machine (carrier detect), example, while other does not. When unique pins same side, your main find some appropriate wiring satisfy those pins. this ways: either borrow voltage from opposite side interface (the other machine) borrow voltage from some same side interface. example, Martin Seyer points book "RS-232 Made Easy," some connections pins some combination these pins) interface, with connection between them other side. Other connections involve both same-side jumpering cross connections. example, might jumper pins together interface then connect other interface. This effect borrowing voltage from other side distributing third best possible worlds (which isn't very good) when each side interface unique pins. When this case often best begin trying treat each side separately. That satisfy unique pins side first. Then satisfy unique pins other side. this first ignoring other side's unique pins. that does work, ahead those pins equation.
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Step Make "best guess" about purpose each unique pin. Before plugging both machines into Break-Out same time starting work actual interface, stop think moment about those unique signals. What could they signify? pins involved, pretty certain they represent standard request/clear send data set/data terminal ready signals. suppose pins even involved. More than likely they designed enable disable flow data telling other machine that some condition occurred. dealing with modem, probably really "data carrier detect." imagine under what condition device might want stop flow data. tape mounted tape drive, printer that paper, device "on-line" mode, good possibilities. even able conveniently test your guesses plugging device into Break-Out artificially creating these conditions. example, suppose plug your printer into Break-Out notice that causes spare glow red. suppose that button printer that takes offline. glows green, certain that you've determined function. Take some notes your ideas guesses. They accurate, they very helpful later when must decide enable particular control pin. Step Connect both devices Break-Out dump data. Now, making sure that switches "open," plug each device's RS-232 connector into Break-Out Box. With small screwdriver ballpoint pen, close switch This will connect
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Next, check your data connections. each device sending other device's receive data pin? Note that most printers they have built-in buffer) have need send data back their computers consequently their data transmitting pins will probably active. Next, check pins Request/Clear Send pair. most situations these pins have physical effect UART chip. That they satisfied with positive voltage, UART rendered unable send data. machine Clear Send (pin other does have mate with you'll have borrow some voltage from some other pin. Often, simplest solution jumper pins together same side interface. this point you're ready conduct your first real test interface. your computer begin dumping data RS232 port. using communications program, instance, order "download" long text file. interfacing printer, enter proper operating system command system "copy" "type" file printer. idea continuous data flow that will cause peripheral come life least something when more right connections made Break-Out Box. Step Continuous data flow test. some data flow, shown changing rapidly from green red, then check your output device. work similar pins above. they used your interface they have forced high connected together data flow. Carrier Detect, have forced high some cases also, this rare unless interfacing modem. else fails forcing high.
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
When have data flow your output device printing whatever, long time continues output (print) correctly. This especially important interfacing printer with buffer. buffer accept data faster than printer print. When buffer gets full must able stop device driving Data Terminal Ready normally used this control. When high send data into buffer, but, when goes (LED Green) sending device must stop. connect whatever your device will stop data flow.
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
Final Goal: cable that works! Once have Break-Out with jumper wires switches where want them, everything works, time build cable. Carefully make chart that shows every jumper wire connection turned switch that needed. chart assemble cable that your finished product-a cable that works! have existing cable that wish modify must first determine wired then change match your chart. With existing cable that wish change another short cable make connections correct jumper (available from Electronics) rewire match your chart. GOOD LUCK GOOD CABLING! Electronics 1987, 1988, 1989, 1990, 1991, 1992
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
DECLARATION CONFORMITY
DECLARATION CONFORMITY
Manufacturer's Name: Manufacturer's Address: Electronics Manufacturing Company P.O. 1040 Dayton Road Ottawa, 61350 232BOB1 RS-232 BreakOut Light industrial equipment 89/336/EEC 50082-1 (IEC 801-2, 801-3, 801-4) 50081-1 55022, 1000-4-2) 61000 (-4-2, -4-3, -4-4, -4-6, -4-8) 50204
Model Numbers: Description: Type: Application Council Directive: Standards:
Michael Fahrion, Director Engineering
232BOB15299 Manual
Electronics Dayton 1040 Ottawa 61350 815-433-5100 815-433-5104 Electronics Westlink Commercial Park Oranmore, Galway, Ireland +353-91-792444 +353-91-792445
FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFACE STATEMENT
Class Equipment This equipment been tested found comply with limits Class digital device, pursuant Part Rules. These limits designed provide reasonable protection against harmful interference when equipment operated commercial environment. This equipment generates, uses, radiate radio frequency energy and, installed used accordance with instructions, cause harmful interference radio communications. Operation this equipment residential area likely cause harmful interference, which case user will required correct interference personal expense.
Class Equipment Statement

Model 232BOB1 Document 232BOB15299 This product Designed Man

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