ANALOG-BOARD Revision Revision ANALOG-BOARD Meter Applicatio
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Meter Application
ANALOG-BOARD Revision
Revision
ANALOG-BOARD Meter Application
Dear Customer, Texas Instruments would like thank your request ANALOG BOARD Revision design kits. following disclaimer applies these design kits.
compliance with Directive (Council Directive 1989 approximation laws Members States relating electromagnetic compability (89/336/EEC) German Act: "Notification Amended Electromagnetic Compatibility August 1995" (para. sec. EMVG) design kits ordered have been marked. target users these design kits users, exclusively professionals (ie. designers, application engineers, etc.), proficient matters. design kits intended development only.
Again, Texas Instruments would like thank your request. have questions, please contact your local Texas Instruments Field Sales Representative your factory representatives. Sincerly Texas Instruments January 1997
ANALOG-BOARD Meter Application
IMPORTANT NOTICE Texas Instruments (TI) reserves right make changes products discontinue semiconductor product service without notice, advises customers obtain latest version relevant information verify, before placing orders, that information being relied current. warrants performance semiconductor products related software specifications applicable time sale accordance with TI's standard warranty. Testing other quality control techniques utilized extent deems necessary support this warranty. Specific testing parameters each device necessarily performed, except those mandated government requirements. Certain applications using semiconductor products involve potential risks death, personal injury, severe property environmental damage ("Critical Applications"). SEMICONDUCTOR PRODUCTS DESIGNED, INTENDED, AUTHORIZED, WARRANTED SUITABLE LIFE-SUPPORT APPLICATIONS, DEVICES SYSTEMS OTHER CRITICAL APPLICATIONS. Inclusion products such applications understood fully risk customer. products such applications requires written approval appropriate officer. Questions concerning potential risk applications should directed through local sales office. order minimize risks associated with customer's applications, adequate design operating safeguards should provided customer minimize inherent procedural hazards. assumes liability applications assistance, customer product design, software performance, infringement patents services described herein. does warrant represent that license, either express implied, granted under patent right, copyright, mask work right, other intellectual property right covering relating combination, machine, process which such semiconductor products services might used.
Copyright 1995, Texas Instruments Incorporated
ANALOG-BOARD Meter Application
Table Contents
Introduction. Specification Description Operation. Circuit Description. Voltage Supply. Transmitter Receiver. Overload Warning. Repeater METER-BUS Application. PCB: METER-BUS Interface Protection. Appendix Transmission Wave Forms. Appendix Parts List
ANALOG-BOARD Meter Application
Introduction
Electronic utility meters becoming commonplace measuring consumption electricity, water, other forms energy. reading such meters personnel unacceptably inconvenient costly. This stimulated development remote bi-directional link between users central unit; such system offers possibility near-continuous measurement, allows supplier change tariffs connect disconnect users. METER-BUS meets existing anticipated future requirements such system, achieved widespread acceptance standardisation. Texas Instruments developed special driver receiver METER-BUS user meters (slaves), TSS721 Transceiver. This powered METER-BUS, that local battery necessary. also does take power from test measurement equipment. corresponding analog board been developed central unit. ensure compatibility, this analog board been conceived such that TSS721 powered with This applications proposal concerned primarily with analog part central unit; only basic functions interface explained.
Warning: This equipment intended laboratory test environment only. generates, uses radiate radio frequency energy been tested compliance with limits computing devices pursuant subpart rules, which designed provide reasonable protection against radio frequency interference. Operation this equipment other environments cause interference with radio communications, which case user expense will required take whatever measures required correct this interference.
ANALOG-BOARD Meter Application
Specification
specification (extract) based Proposal "Physical Layer busfaehigen Schnittstelle", which resulted from meeting working group CEN/SPA 176, 18.06.90.
Parameter *Number slaves 1000 *Number slaves 4000 Capacitance slaves Master Slave direction Slave Master direction ***Baud rate Isolation resistance **MARK SPACE MARK SPACE
Unit
baud MOhm
MARK-12 Volt
2400
Notes: Using standard cable, example Y-(St)Y number slaves, this development board, limited output current voltage MARK ANALOG -BOARD features communication 9600 baud.
ANALOG-BOARD Meter Application
Description Operation
part Master, analog board provided with following functions: voltage modulation (TRANSMITTER) when transferring data from Master Slave current detection (RECEIVER) when transferring data from Slave Master Powering Remote powering slaves (via TSS721) current detection overload (OVERLOAD WARNING) System enlargement (REPEATER) Voltage regulation (VOLTAGE SUPPLY) Terminal connector (RS232 DRIVER)
+BUS -BUS
METER
+BUS -BUS
TRANSMITTER
REPEATER
RECEIVER RS232 DRIVER
OVERLOAD WARNING
-BUS
VOLTAGE SUPPLY
Figure Block Diagram ANALOG BOARD
ANALOG-BOARD Meter Application
Circuit Description
individual parts circuit block diagram Fig. will separately described. supply voltage should provided external power supply. voltages must isolated from earth high resistance, must also must have short-circuit protection with current limiting. auxiliary voltage derived from supply voltage. With this arrangement DC/DC converter used convert into required -BUS -30V.
Voltage Supply DC/DC converter IC101 simplifies multiple powering METER-BUS board converts voltage into auxiliary voltage -30V. supply loaded with about 1.5A current IBUS auxiliary voltage ensures stable working point amplifier input voltage.
J1-1 IC102 7805 C106 470µF IC101 PT4962 INPUT OUTPUT C101 4.7µF C102 C103 R101 R102 J1-2 IC103 MAX232 C1C2+ C2-2VCC+1.5V RS232 2VCC-1.5V D101 1N4001
C104 C105
-BUS
Figure Supply Voltage RS232 Connection
ANALOG-BOARD Meter Application
single supply RS232 driver IC103 connects METER-BUS Master with either directly MODEM. Half-duplex RS232 transmission 9600 Baud compatible with METER-BUS. signal controls voltage modulation direction slave, signal result current modulation from slave.
Transmitter information direction MASTER SLAVE transmitted with voltage modulation. modulation pulses pass from input RS232 driver IC103 (see Fig. isolating opto coupler OC502 REPEATER operation (see Fig. modulation amplitude (Mark resistors R204 R205 voltage. Transmitter includes power stages METER-BUS. power amplifier IC201 configured common-mode ensure matching voltage reference level impedance bus. This order able output (Pin 3,6) accurately with respect ground potential (GND). basic load (R208 R213 C206) central unit sets working point specified data rate: influence external capacitances (wiring, number slaves connected) rate pulse riseand fall-times thus kept within limits. remaining part circuit establishes current when transmitting data from Slave Master, also supplies power remotely powered slaves. current detection only possible voltage remains constant i.e. slow load changes must regulated. starting point such regulation charged state capacitor C202. Voltage changes detected comparator IC202 compensated current source transistor T202 until voltage across capacitor C204 reached same level C202. operation regulator stage arranged that unregulated state resistor R208 conducting current. time constants chosen such that during data modulation (fast pulses) slow regulation does follow voltage changes.
ANALOG-BOARD Meter Application
R209 T202 TIP117 J3-1 +BUS R214 6.8K
R203 IC201 TLE2301 C201 47pF R205 D201 1N4448 R206 2.74K R204 R207 249K C202 -BUS R208
C203 47µF
R213
R215 D202 1N4448 R210 2.74K R212 C205 IC202 TLE2021 R211 249K C204 22µF
R201
T201 BC183
C206 220nF
R202
J3-2 -BUS
Figure Transmitter
function resistors R208 R213 explained sections RECEIVER OVERLOAD WARNING.
ANALOG-BOARD Meter Application
Receiver receiver (see Fig. detects current pulses when data transmitted from Slave Master. current sink slave results voltage drop terminating resistors R208 R213 (Transmitter).
R304 D301 1N4148 IC301 LM393/A R302 4.7K R303 1.5M C302
C301 39pF R301 4.7K D302 BAT41
Figure Circuit Diagram Receiver
Schottky diode D302 together with resistors R302 R303 sets switching threshold, which remains stored capacitor C302 result long time constant. When comparator IC301 (/A) detects smaller voltage recovers signal which been recognised. output supplied from voltage opto coupler OC501.
ANALOG-BOARD Meter Application
Overload Warning This part circuit necessary indicate faults follows: Short circuit between both lines Excessive load (too many slaves)
D401 R405 IC301 LM393/B
C402 150pF R401 R402 2.2K R403 C401 10µF R404 C403 10µF
Figure Overload Warning voltage drop over resistor R213 (TRANSMITTER) greater than that over resistor R403 then comparator IC301 switches D401
ANALOG-BOARD Meter Application
Repeater repeater increases distance between Master last Slave also slave loading. transceiver TSS721 loads Master equivalent slave. opto-couplers isolate Repeater from Master Analog Board.
J4-1 J4-2 R502 R503 OC501 6N136 R510
D502 4148
IC501 TSS721 BUSL1 BUSL2 RIDD R504 C502 100nF R505 2.2K C503 10µF R506 150K T501 BC183 R507 RGND R508 OC502 6N139
R511
R514 D501 1N4148
R512 C504 220pF T502 BC183
R516 330K C501 100nF
R501
R509
R513 100K
R515
Figure Repeater Support
ANALOG-BOARD Meter Application
METER-BUS Application
This application proposal based with RS232 termination. supports development, functional test direct operation small medium sized test requirements. following diagram shows principle Master-Slave configuration. building, telephone line laid between central unit connection sockets, which slaves turn connected. master connected either directly MODEM.
SLAVE TSS721
SLAVE
METER
TSS721
+18V
SAFETY DEVICE
Meter-Bus Analog Board Rev.
RS232 e.g. MODEM TELECOM MODEM
Figure Block Diagram Meter-Bus Master
ANALOG-BOARD Meter Application
PCB: METER-BUS Interface circuits Figs single circuit board with dimensions connectors boards follows: Supply Voltage RS232 connection METER-BUS connection Repeater connection
METER REPEATER
DC/DC
RS232
Meter-Bus Analog Board Rev.
Figure PCB: Meter-Bus Interface
ANALOG-BOARD Meter Application
Protection Various alternatives exist protect system against excess voltages, which could otherwise cause faulty operation damage. Fig. shows simple approach using transient suppressor capacitor best solution depends very much application environment, therefore left user, e.g. short wiring blows fuse emission reduced connecting cable shield virtual ground BGND.
+BUS
+BUS'
from Analog Board BGND Meter
-BUS -BUS
Figure Simple Protection Circuit
ANALOG-BOARD Meter Application
Appendix Transmission Wave Forms
+BUS
Figure Direction: MASTER SLAVE
+BUS
Figure Direction: SLAVE MASTER
ANALOG-BOARD Meter Application
Appendix Parts List
(Fig Position Component Stand screw Type height Notes
Reference Voltage (Fig Position C101 C102, C103, C104, C105 C106 R101 R102 D101 IC101 IC102 IC103 Component Capacitor Capacitor Type Notes Tantalum Tantalum
Capacitor Resistor 0.25 Resistor 0.25 Diode DC-DCConverter Voltage regulator RS232 Transceiver Terminal block Connector
1N4001 4962 7805 MAX232 WAGO 166753-3
Elco
±15V TO220
Power Supply Sub-D, 25-pole, female
ANALOG-BOARD Meter Application
Transmitter (Fig Position R201, R203, R204 R202 R205 R206, R210 R207, R211 R208 R209 R212 R213 R214 R215 C201 C202 C203 C204 C205 C206 D201, D202 T201 T202 IC201 IC202 Component Resistor 0.25 Type Notes
Resistor 0.25 Resistor 0.25 Resistor 0.25 Resistor 0.25 Resistor 0.25 Resistor 0.25 Resistor 0.25 Resistor 0.25 Resistor 0.25 Resistor 0.25 Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Diode Transistor Transistor Amplifier Amplifier Terminal block
2.74 100V 100V 100V 1N4448 BC183 TIP117 TLE2301 TLE2021 WAGO
Ceramic Tantalum Tantalum Tantalum
npn, TO92 pnp-Darl., TO220 connects, female
ANALOG-BOARD Meter Application
Receiver (Fig Position R301, R302 R303 R304 C301 C302 D301 D302 IC301 Component Resistor 0.25 Resistor 0.25 Resistor 0.25 Capacitor Capacitor Diode Diode Comparator Type 100V 1N4148 BAT41 LM393 Notes
Ceramic Tantalum Schottky LM393/A
Note: half LM393/B used overload warning.
Overload Warning (Fig Position R401 R402 R403 R404 R405 C401, C403 C402 D401 IC301 Component Resistor 0.25 Resistor 0.25 Resistor 0.25W Resistor 0.25 Resistor 0.25 Capacitor Capacitor Comparator Type 2.2K 100V LM393 Notes
Tantalum Ceramic Overload LM393/B
ANALOG-BOARD Meter Application Repeater (Fig Position Component Type R501 Resistor 0.25 R502, Resistor 0.25 R503 R504 Resistor 0.25 R505 Resistor 0.25 R506 Resistor 0.25 R507 Resistor 0.25 R508, Resistor 0.25 R509, R511, R512, R514 R510 Resistor 0.25 R513 Resistor 0.25 100K R515 Resistor 0.25 R516 Resistor 0.25 330K C501, Capacitor 100V C502 C503 Capacitor C504 Capacitor 100V D501 Diode 1N4148 T501, Transistor BC183 T502 IC501 Bus-Transceiver TSS721 OC501 Optocoupler 6N136 OC502 Optocoupler 6N139 Terminal block WAGO Notes protection
Tantalum npn, TO92
connectors, female
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