
Using the Modbus Ports
870USE10110 July 2004 109
4.2 Modbus Port 2
(On Selected Momentum Components)
Purpose Five Momentum components offer this port.
171 CCS 780 00 processor adapter
171 CCC 780 10 processor adapter
171 CCC 980 20 processor adapter
171 CCC 980 30 processor adapter
172 JNN 210 32 serial option adapter
This section describes the port and provides guidelines for Modbus RS485
networks.
Features of an
RS485 Port
The RS485 protocol handles messaging over long distances with higher level of
noise immunity than RS232 without the need for modems.
What's in this
Section?
This section contains the following topics:
Topic Page
Modbus Port 2 (On Selected Momentum Components) 110
Four-Wire Cabling Schemes for Modbus RS485 Networks Connecting
Momentum Components
113
Two-Wire Cabling Schemes for Modbus RS485 Networks Connecting
Momentum Components
116
Cable for Modbus RS485 Networks Connecting Momentum Components 118
Connectors for Modbus RS485 Networks Connecting Momentum
Components
121
Terminating Devices for Modbus RS485 Networks Connecting Momentum
Components
122
Pinouts for Modbus RS485 Networks Connecting Momentum Components 123
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