ABB TPU2000 Technical Manual
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TPU2000/2000R Modbus/Modbus Plus/ Modbus TCP/IP Automation Guide364Table 1 - RS485 Communication Card RS485 Cross-Reference ListPINDESIGNATIONCOM 3 TYPE 8 COMPORT (2000R Family)AUX COM PORT(2000R Family)AUX COM PORT(2000 Family)+ 5 VDC 8 60 77RS485 Common 7 57 74RS-485 (-) 2 56 73RS-485 (+) 1 55 72Wire attachment on an RS 485 TYPE 8 card’s COM 3 DB 9 port can be tricky in an in-line installation. ABB has aspecial connector, which changes the female DB 9 port into a PHOENIX contact 9-pin connector (similar in formatto the AUX COM PORT). The ABB part number of this 9 Pin male to Phoenix Card Connector is ABB part602133-009. The same part is also available from Phoenix Contact and the part number is 27 61 50 9.TroubleshootingThe TELEBYTE RS 232/RS485 converter Model Number 245 has the advantage of four LED’s present at the sideof the unit (as indicated in Figure 1) indicating RS232 port transmit data, RS232 port receive data, RS 485 porttransmit data and RS 485 port receive data. Visual indication of these LED’s should allow the implementor totroubleshoot a unit, which does not communicate at all.If communication messages do not appear to be transferred from the RS 232 port to the RS 485 port, one shouldinvestigate wiring, DTE/DCE emulation switches, and the wiring on the RS 232 and RS 485 ports.If the error rate of communication message transmission and reception is high, investigate wiring in the areas of:1. Biasing of the cable in only one location.2. Installation of termination resistors at two nodes only (at both remote ends).3. Cable installation with three wires AND A SHIELD. REMEMBER SHIELD IS NOT GROUND.4. DAISY- CHAINING the RS 485 wiring so no in-line stubs, taps, and junction strips are inserted in the unit.5. Incorrect installation of the Shield (connected at in line nodes and isolated at ground).6. Incorrect lengths of RS 485 or RS 232 cables (3000 feet = RS 485 or 50 feet = RS 232).7. Incorrect selection of “handshake control” for operation with the IED or Host (ABB IED’s do not employhandshaking. Some hosts require RTS/CTS handshaking or the CD and DTR signal must be looped back inthe cable.)ConclusionThere are many converters available on the market. Successful communication can result in using manymanufacturers’ physical interface converters. Success in implementing a physical interface relies on theimplementor’s knowledge of the software control of the physical interface, IED physical interface operation andknowledge of the particular brand of converter.Contributed by:John PopiakRevision 0, 03/01 |
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