Modbus Communication Interface
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8-1
MODBUS COMMUNICATION INTERFACE
This chapter describes the customer serial communication interface on
Model IPS-4 Analyzer. The communication protocol implemented is
Modicon Modbus as defined in “Modicon Modbus Protocol Reference
Guide” (PI-MBUS-300 RevJ). The Modbus protocol transmission mode
implemented is Remote Terminal Unit (RTU) with the analyzer operating
as a slave device.
The IPS-4 Analyzer supports RS485 serial communication standards. The
physical communication connection between a Model IPS-4 analyzer
and a customer DCS\SCADA\PLC\DAS or a general-purpose computer is
RS485. The analyzer RS485 connection supports 2-wire multi-drop sys-
tems.
Hardware:
RS485 termination resistors are provided on the CPU assembly. If the CPU
is the last device in the RS485 chain, the terminating resistors should be
used. To enable the terminating resistors place a shunt in positions 3-5 and
4-6 for J9. To disable the termination resistors, the jumpers should be in
placed in positions 1-3 and 2-4 for J9.
The converter terminal marked TD(B) which is same as Tx+ should be
connected to the CCB_J14 connector marked Tx+ (pin3) on the Customer
Connection Board, and TD(A) should be connected to Tx- (pin 4).
Summary of Contents for IPS-4-UV
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Page 183: ...Appendix Drawings A 5 Detector Interface Board 100 1937...
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Page 185: ...Appendix Drawings A 7 Display Interface Board 100 1978...
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Page 189: ...Appendix Drawings A 11 MCU Board 100 1914...
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Page 191: ...Appendix Drawings A 13 Electronics Enclosure Wiring Diagram Sheet 1 of 3 WX 102877...
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