Issue
External resistors are required for Biasing and Terminating RS-485 trunks connected to an Automation Server (AS)
Product Line
EcoStruxure Building Operation
Environment
- SmartStruxure Automation Server (AS) with RS-485 trunk(s) under it.
- Field controllers on the RS-485 trunk; for example, the Network 8000 ASD controllers (MZ2, PEM1, etc)
Cause
Bias and terminating resistors are not built into the AS hardware.
Resolution
External resistors are required for Biasing and Terminating RS-485 trunks connected to an Automation Server (AS).
See the Technical Reference Guide, revision 1.3, pages 2723, 2724, and 2771.
Also check out the SmartStruxure-RS485-Network Installation Quick-Help video on the Exchange.
Biasing and Termination details are now found in the "RS-485 Communications" chapter of SpaceLogic - Hardware Reference Guide
