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Using the Modbus Ports
114
870 USE 101 00 V.3
Four-Wire Cabling Schemes for Modbus RS485 Networks, Continued
Slave Cabling The slaves use a pin-for-pin cable, such as the Modbus Plus / Modbus RS485
Short Interconnect Cable or any Cat. 5 4-Twisted Pair Ethernet cable AWG#24.
Single Master/
Slave Option 1
The following illustration shows components used in a four-wire single master/slave
cabling scheme. In this view, a master cable (#3) is used on both sides of the
master. 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 / Modbus RS485 Short Interconnect Cable.
Color code - black
170 MCI 020 10
Note: Each cable has different colored boots. The color of the boots signifies the
cable’s function.
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