AERCO AM Series Boiler Modbus Interface Manual - Manual (Page 7)

AM Series Modbus Interface Manual
1.3.2 Controller Type
For easier handling of holding registers, the data format can be changed on the modbus
interface. This means that all unit conversion is done in the modbus interface (for both reading
and writing data).
Controller Type Parameter
Holding
Register
Access
Parameter Name
Automatic
Conversion
Range
R W
97 0061 X - Main Control Group Number V 0000 – 10000
The group number will identify the Main Control Group number which identifies specific system
settings.
1.3.3 Modbus Version
For easier handling of holding registers, the data format can be changed on the modbus
interface. This means that all unit conversion is done in the modbus interface (for both reading
and writing data).
Modbus Version Parameter
Holding
Register
Access
Parameter Name
Automatic
Conversion
Range
R W
98 0062 X - Modbus Version - 12
On readout the value can be displayed with the unit set in this holding register without
conversion other than decimal point correction. So 12 is 1.2.
1.3.4 Modbus Units
For easier handling of holding registers, the data format can be changed on the modbus
interface. This means that all unit conversion is done in the modbus interface (for both reading
and writing data).
Modbus Units Parameter
Holding
Register
Access
Parameter Name
Automatic
Conversion
Range
R W
100 0064 X X Modbus Units -
Bit0: °C / °F
Bit1: bar / psi
To change the units, first enable writing in the control register, and then set the appropriate
configuration bits in the Modbus Units register.
To enable decimals on readout, values are multiplied before they are stored in the holding
register. They must be divided on readout to obtain the original value.
• Temperatures:
resolution xxx.xx factor 100 Unit as set in Unit register
• Voltages:
resolution xx.x factor 10 Unit as set in Unit register
On readout the value can be displayed with the unit set in this holding register without
conversion other than decimal point correction.
OMM-0102_0A
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PRI: 09/22/2014