Distech Controls RS485 Installation Manual

Dual RS485 Option Module
Figure 1: Dual RS485 Option module
Product Description
The RS485 is a dual port, electrically isolated adapter, with two 3-position, removable screw-terminal connector plugs for the EC-BOS-8 and EC-BOS-9.
Each port has an RS485 bias switch to set or remove biasing. LEDs verify power and termination from the EC-BOS and indicate RS485 trunk message
traffic.
Module Combinations
The EC-BOS supports a maximum total of two Dual RS485 modules and up to a total of four option modules across all option types. If you use a single
RS-485 module, you can add three non-485 modules. If you use the maximum of two Dual RS485 modules, you can add one more non-485 module for a
total of three modules.
COM Port Assignments
The EC-BOS has two onboard RS485 ports that always operate as COM1 and COM2. Installed serial option modules continue COM port numbering
based on proximity to the EC-BOS, where the option module closest to the EC-BOS base operates as the next available serial COM port(s). For exam-
ple, if attached directly to the EC-BOS, this dual RS-485 option module operates as COM3 (upper port) and COM4 (lower port).
For related details, see "COM Port Usage
Related topics such as the mounting and wiring of the EC-BOS or other option modules, installation of EC-Net™ 4 software, and usage of the various
RS-485-based drivers are in other documents. See
Included in this Package
Included in this package:
£
One Dual RS485 option module, with two 3-position terminal plugs for wiring to an RS485 trunk, and a grounding wire with quick-disconnect con-
nector.
[pg. 4]," page 3.
"Related Documentation [pg. 7]," page 4.
I n s t a l l a t i o n G u i d e