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ICE CFA1120A-3360A & CGA3180A I&O Manual 03/2021 Rev.5
Registers:
Read with Function Code 04, Write to RW or WO registers with Function Code 06
ID
Description
Size
Data Format
R/W
1
Heat Setpoint
16 Bit 45º-100º F
RW
2
Cool Setpoint
16 Bit 45º-100º F
RW
3
Temperature Calibration
16 Bit
0-20, 10 is default. Less
than 10 is a negative offset,
11-20 is a positive offset
RW
4
W2 Speed Multiplier
16 Bit
0-100, 80 is default.
Represents a percentage of
the Y2 fan speed
RW
5
Dehumidification Speed Multiplier
16 Bit
0-100, 80 is default.
Represents a percentage of
the Y2 fan speed
RW
6
OFM Set Speed
16 Bit 0 - 1023
RW
7
IFM Y1 Set Speed
16 Bit 0 - 1023
RW
8
IFM Y2 Set Speed
16 Bit 0 - 1023
RW
9
Modbus Timout Setting
16 Bit
1 - 60, default 25;
represents minutes of
allowed MODBUS inactivity
before switching to onboard
T-Stat mode
RW
10
Current OFM Speed
16 Bit 0 - 1023
RO
11
Current IFM Speed
16 Bit 0 - 1023
RO
12
Anti Short Cycle Compressor 1
16 Bit 0 - 360, 0.5 sec. per step
RO
13
Anti Short Cycle Compressor 2
16 Bit 0 - 360, 0.5 sec. per step
RO
14
Voltage Reading
16 Bit
0 - 1023
1023 = Greater than 20V
965 = 18V cutoff
RO
15
P1 Temperature Reading
16 Bit 0º-160º F
RO
16
P2 Temperature Reading
16 Bit 0º-160º F
RO
17
Freeze Sensor 1 Temperature Reading
16 Bit 0º-160º F
RO
18
Freeze Sensor 2 Temperature Reading
16 Bit 0º-160º F
RO
19
Alarm Status
16 Bit
0 = No Fault
1 = Future Use
2 = HPS1 Fault
3 = Future Use
4 = HPS2 Fault
5 = Future Use
6 = Future Use
7 = LPS1 Fault
8 = LPS2 Fault
9 = Future Use
10 = Future Use
11 = Future Use
12 = Future Use
13 = Freeze Fault 1
14 = Freeze Fault 2
15 = Y1 Locked Out
16 = Y2 Locked Out
17 = Low Voltage
RO
Table 6b. MODBUS Registers
