RS-485 RS-485 Optical Isolator/Repeater Model 485OP 485OP us
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Documentation Number 485OP3401-
RS-485 RS-485 Optical Isolator/Repeater
Model 485OP
485OP used optically isolate piece RS-485 equipment from rest RS-485 system, local group RS-485 equipment from another. also used RS-485 repeater expand existing RS-485 system greater than node limitation RS-485 Standard. typical setup using 485OP RS-485 repeater shown Figure data lines well power ground isolated from side 485OP other. 485OP uses terminal blocks each side device. supports Transmit Data (B), Receive Data (B), Protective Ground, Signal Ground.
Connection:
485OP operates either two-wire half-duplex systems four-wire half-duplex full-duplex systems (see Figures also operate four-wire two-wire converter. connecting side 485OP two-wire device side fourwire device, equipment meant point-to-point RS-422 interface connected directly RS-485 two-wire multi-drop system. Proper operation RS-485 system requires presence signal return path. RS-485 Standard recommends that third wire used this. safety, resistor should connected between frame ground signal ground every drop point. transient suppression 485OP work properly, protective ground (PG) terminal must tied good frame (chassis, green wire, earth) ground. wire type maximum length listed RS-485 Standard. However, RS-422 Standard, which very similar, recommends number 24AWG twisted pair telephone cable with shunt capacitance picofarads foot more than 4000 feet distance. Operation: When data being transmitted through 485OP, receivers enabled both sides device. data received side 485OP, opposite driver enabled data traffic turned When 485OP receives falling edge last data bit, waits character time disable driver. This timeout period factory preset millisecond accommodate baud rate 9,600 bits second. timeout period changed value between 0.26 4.16 milliseconds removing cover moving jumpers inside 485OP. preset jumper settings available 485OP should accommodate almost systems, different timeout achieved putting position changing values capacitors resistors R25. Spaces through-hole replacement these components also provided. They labeled C15, C16, R26, R27. jumper positions various baud rates, well resistor capacitor values time-out periods beyond this range given Table Figure location timing components. Jumpers determine whether receivers will disabled when transmitting (half-duplex) always enabled (fullduplex). general rule, should half-duplex position two-wire operation full-duplex position fourwire systems. Figure location jumpers JP1-JP4 board. Specifications: Isolation: Surge Suppression:
DECLARATION CONFORMITY
Manufacturer's Name: Manufacturer's Address: Electronics Manufacturing Company P.O. 1040 Dayton Road Ottawa, 61350 485OP RS-485 Optical Isolator/Repeater Light industrial equipment 89/336/EEC 50082-1 (IEC 801-3, 801-4) 50081-1 55022) 61000 (-3-2, -3-3, -4-2, -4-3, -4-4, -4-6, -4-8) 50204
2.000 volts min. optical isolation data lines ground. 6.5V working peak voltage, bi-directional over voltage suppressor. 600W peak power dissipation. 3,000 maximum capacitance.
Model Numbers: Description: Type: Application Council Directive: Standards:
Data Rates: Temperature Rating: Power Requirements:
460.8K baud. +70°C 9-14V 60mA (idle state), 170mA (Full-duplex data with load) Dimensions: 3.8"L 2.4"W 1.0"H Approved Class
Michael Fahrion, Director Engineering
Electronics January 1993 Revised August 2001
This product designed manufactured domestic imported parts
Documentation Number 485OP3401-
4000 CABLE OTHER RS-485 DEVICES TX/RX TX/RX SIG. GROUND FRAME
DATA DATA DATA DATA SIGNAL GROUND PROT. GROUND +12VDC
DATA DATA DATA DATA SIGNAL GROUND PROT. GROUND
4000 CABLE OTHER RS-485 DEVICES
HOST DEVICE
+12VDC
485OP
TX/RX TX/RX SIG. GROUND
TX/RX TX/RX SIG. GROUND
FRAME GROUND
FRAME GROUND
DEVICE
DEVICE
FIGURE 485OP Two-Wire Repeater
SIGNAL SOLID BLACK WIRE WHITE MARKED WIRE DATA DATA DATA DATA SIGNAL GROUND PROT. GROUND GROUND +12VDC
Table
APPROXIMATE TIMEOUT VALUES
Baud Rate 1200 2400 4800 9600 19.2K 38.4K 57.6K 115.2K Time (ms) 33.3 16.6 8.33 4.16 2.08 1.04 0.52 0.26 0.18 0.087 Resistor Capacitor Jumper Position (ohm) (mfd) 330K 160K 820K 430K 200K 100K 8.2K 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
485OP
FIGURE Four-Wire Setup
DATA DATA DATA DATA DATA DATA SIGNAL GROUND PROT. GROUND GROUND +12VDC
SIGNAL SOLID BLACK WIRE WHITE MARKED WIRE
485OP
FIGURE Two-Wire Setup
FIGURE Board Layout
FIGURE Board Layout Bottom
Electronics January 1993 Revised August 2001
This product designed manufactured domestic imported parts
Documentation Number 485OP3401-
FIGURE Circuit Diagram
Electronics January 1993 Revised August 2001
This product designed manufactured domestic imported parts
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