Rockwell Automation Allen-Bradley DriveLogix 5730 User Manual page 180

9-8 Communicating with Devices on a DH485 Link
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Termination
Data A
Data B
Common
Shield
Chassis Ground
Grounding and Terminating a DH-485 Network
You must terminate the network at the first and last PHYSICAL devices, by
connecting pin 6 (Termination) to pin 5 (Data A).
You must ground the network at the first PHYSICAL device by connecting
pin 1 (Chassis Ground) to pin 2 (Shield).
Add jumpers to connect pin 6 (Termination) to
pin 5 (Data A) on the first and last PHYSICAL devices
6
OR/WH
5
WH/OR
4
BU
3
2
1
Add jumper to connect pin 1 (Chassis Ground) to
pin 2 (Shield) on the first PHYSICAL device
Important: A device's physical location may be independent of its node
address. Make sure you ground and terminate the proper
PHYSICAL locations.
6 Termination
OR/WH
5 Data A
WH/OR
4 Data B
BU
3 Common
2 Shield
1 Chassis Ground