Modbus Communication Interface | 8-1
MODBUS COMMUNICATION INTERFACE
This chapter describes the customer serial communication interface on
the 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 RS-485 serial communication standards. The
physical communication connection between an IPS-4 analyzer and a cus-
tomer DCS\SCADA\PLC\DAS or a general-purpose computer is RS-485.
The analyzer RS-485 connection supports 2-wire multi-drop systems.
Hardware:
The jumpers on the CPU board J9 connector should be installed between
the 1-2 and 3-4 pins.
The converter terminal marked TD(B) which is same as Tx+ should be
connected to the CCB_J14 connector marked Tx+ (pin 3) on the Custom-
er Connection Board, and TD(A) should be connected to Tx- (pin 4).
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