Installation manual

Series C Controller Configuration and Operation Manual
1-4  Athena Controls, Inc. 900M050U00
1.2.6 Serial Communications
The 1ZC model always supports an RS-485 serial communications interface. The 16C,
18C, and 25C are all available with an optional RS-485 serial communication interface.
(When ordering the controller you can select processor board firmware for either
MODBUS protocol or Athena Plus protocol to work with the RS-485 interface.) An
RS-232 serial communication interface is available as an option for the 16C, 18C, and
25C models. (An RS-232 interface can be used with Athena Plus protocol, but not
MODBUS).
Athena Multi-Comm software can be used to communicate with the controllers equipped
with an RS-485 or RS-232 interface and firmware for the Athena Plus protocol as
described in the Multi-Comm User’s Guide.
Guidelines for using a MODBUS host to communicate with the Series C controllers are in
Using the MODBUS Protocol with Athena Series C (1ZC, 16C, 18C, and 25C)
Controllers.