
Using the Modbus Ports
870 USE 101 00 V.2.2
93
Two-Wire Cabling Schemes for Modbus RS485 Networks,
Continued
Cable
All devices are connected with the same pin-for-pin cable, such as the Modbus Plus
or Modbus RS485 Short Interconnect Cable or any Cat. 5 4-Twisted Pair Ethernet
cable AWG#24. A master/slave system using 2-wire cabling does not require the
special master communication cable.
Multimaster/
Slave Cabling
The following diagram shows components used in a multimaster/slave network.
Each Momentum module must include a Processor Adapter or Option Adapter with
a Modbus RS485 port.
Continued on next page
Description Part Number
Modbus Plus or Modbus RS485 Short Interconnect Cable 170 MCI 020 10
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 Plus / Modbus RS485 Short Interconnect Cable 170 MCI 020 10
4 Modbus RS485 connector “T” (RJ45 base) 170 XTS 041 00
5 Terminating shunt plug 170 XTS 042 00
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