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RS-485 Modbus Serial Cables
Trident Planning and Installation Guide
on the distance between branches.The following figures show these connections as
they should be made at the MP or CM.
When an MP or CM is a slave in a multi-point network, multiple transmitters
connect to the same conductor. One transmitter can be active at any time;
otherwise, the signal is distorted. Therefore, each node must be in the tristate (or
off) mode. To set the tristate mode for the MP and CM, set the Handshake mode to
Hardware using the Setup dialog box in TriStation’s Hardware Allocation screen.
RS-485 Modbus
Slave Network
1
6
7
9
2
3
4
5
CM or MP
Serial Port
Shield
RD-A
RD-B
5 VDC through 1 K
1 K
(optional)
Signal Ground (optional)
SD-A
SD-B
Ω
Ω
RD-A
SD-A
Trunk R
Trunk T
Network Trunk
RD-B
SD-B
RS-485 Modbus
Master Network
1
6
7
9
2
3
4
5
Shield
RD-A
RD-B
5 VDC through 1 K (optional)
Ω
Signal Ground (optional)
SD-A
SD-B
RD-A
SD-A
Trunk R
Trunk T
Network Trunk
RD-B
SD-B
1 K
Ω
CM or MP
Serial Port
Summary of Contents for Trident
Page 1: ...Trident Version 1 2 Triconex An Invensys Company Planning and Installation Guide ...
Page 10: ...x Contents Trident Planning and Installation Guide ...
Page 16: ...xvi Training Trident Planning and Installation Guide ...
Page 53: ...Main Processor Module 37 Chapter 3 System Description Model 2101 Main Processor Baseplate ...
Page 140: ...124 Covers Trident Planning and Installation Guide ...
Page 216: ...200 Replacing Modules Trident Planning and Installation Guide ...
Page 238: ...222 Diagread Cables and Debug Connectors Trident Planning and Installation Guide ...
Page 240: ...224 Trident Planning and Installation Guide ...
Page 248: ...232 Trident Planning and Installation Guide ...
Page 264: ...248 Glossary Trident Planning and Installation Guide ...
Page 274: ...258 Index Trident Planning and Installation Guide ...