Sterling Power Products SMC 1/2 - 1 1/2 Portable Chiller - Manual (Page 30)

Page 30 SMC Series Chillers
5-6 Optional Communications
Standard Omron Protocol
The communications function allows you to monitor and set E5CK parameters by a
program prepared and running on a host computer connected to the E5CK controller.
When using the communications function, you must add on the unit for RS-232C or
RS-485 communications. The E5CK communications function allows you to read/write
parameters, do operating instructions, and select the setting level.