
Using the Modbus Ports
870USE10110 July 2004 115
Single Master/
Slave Option 2
The following illustration shows components used in a four-wire single master/slave
cabling scheme. In this view, the master is at one end of the network and is
connected by a single master cable (#3). Terminating resistors (#1) are used at both
ends of the network.
Each Momentum module must include a processor adapter or option adapter with a
Modbus RS485 port.
Legend:
1
2
3
4
2
2
4
5
1
4
2
Slave Slave Slave
Master Slave
Label Description Part Number
1 Terminating resistor plug 170 XTS 021 00
2 Modbus RS485 connector T (DB9 base) 170 XTS 040 00
3 Modbus RS485 master communication cable 170 MCI 041 10
4 Modbus Plus / Modbus RS485 short interconnect cable 170 MCI 020 10
5 Modbus RS485 connector T (RJ45 base) 170 XTS 041 00
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