5
1 General
This document specifies a subset of the Modbus serial communications protocol used to transfer data
between a master computer station and the ETC2002. The document provides the complete
information necessary to develop third-party communications software capable of communication
with the ETC2002. Additional information concerning communications operation, configuring the
communications parameters, and communications connections is found in "ETC2002 Installation and
Operation Manual".
IMPORTANT
Most of the advanced features are configured using multiple setup parameters that can be accessed in a
number of contiguous registers. When writing the setup registers, it is recommended to write all the registers
at once using a single request.
