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Using the Modbus Plus Ports
164
870 USE 101 00 V.3
Cluster Mode Cabling Schemes, Continued
Termination You must terminate both ends of the network with special terminating resistors.
Cable Between
Nodes in a
Cluster
The minimum length of cable between nodes in a cluster is 10 in (.25 m).
Cable Between
Clusters
The minimum length of cable between clusters is 10 ft (3 m).
Drop Cables Drop cables connecting a cluster to the trunk cable must be at least 10 ft (3 m)
long. A 10 ft drop cable is available. A 30 ft drop cable may be fabricated by
removing one RJ45 connector from a 30 ft interconnect cable. Connect the open
end of the cable to a Modbus Plus tap, using the wiring illustrations on page 170.
Continued on next page
Description Part Number
Modbus Plus or Modbus RS485 Terminating RJ45 Resistor Plugs
(pack of 2)
170 XTS 021 00
Description Part Number
Modbus Plus / Modbus RS485 Short Interconnect Cable 170 MCI 020 10
Modbus Plus or Modbus RS485 3 ft. Interconnect Cable 170 MCI 020 36
Description Part Number
Modbus Plus or Modbus RS485 10 ft. Interconnect Cable 170 MCI 021 80
Modbus Plus or Modbus RS485 30 ft. Interconnect Cable 170 MCI 020 80
Description Part Number
Modbus Plus 10 ft. Drop Cable 170 MCI 021 20
Modbus Plus or Modbus RS485 30 ft. Interconnect Cable 170 MCI 020 80