AERCO C-More Controls Manual June 2010 - Manual (Page 140)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
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3) To change from Degrees F, degrees C, to “counts”, select the appropriate value for the
SSD Format parameter. In most cases degrees F/C are used. The Counts option should
only be used for legacy installations.
BAS Setup
To setup BAS communications, use the following Modbus point tables below.
Reading Operational Data from a BST System and Writing Control Values
This document assumes that the BAS side of the SSD will be using Modbus, but equivalent
addressing and timing considerations apply to other communications methods (e.g. BACNET,
Modbus over TCP, etc.).
During normal operation, the BAS writes to two (2) address ranges on the SSD to send control
values to the BST system. It reads from two address ranges to retrieve operational state
information from the BST system.
Data is structured into header data (the BST system data) and then sections of data that is
repeated for each unit.
Modbus Points List
Writing Control Values
The registers used to write control values are 40200 through 40203 and 40051.
BAS
Register Use Description/Notes
40200 BST setpoint This is the temperature each water heater in system will
control outlet temp to.
If the value written to BST setpoint is below the minimum
allowed value or above the Maximum allowed value, all
registers between 40200 and 40203 will be ignored on the
assumption that none of the data is valid.
40201 BST setback
setpoint This is the temperature each water heater in system will
control outlet temp to during the night setback period (if night
setback is enabled).
40202 BST setback start The time the setback period starts. This is expressed in
minutes since midnight. For example 360 would correspond to
6am.
40203 BST setback end The time the setback period ends. This is expressed in
minutes since midnight. If setback start and setback end are
the same value, there is no setback period.