Table of Contents
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7.8.
External Fault ............................................................................................................................................... 24
7.9.
ON/OFF status output .................................................................................................................................. 25
7.10.
Heating status output ................................................................................................................................... 25
7.11.
Cooling status output .................................................................................................................................... 25
7.12.
Fault output .................................................................................................................................................. 26
7.12.1.
Using Twin / Triple / Quad systems ....................................................................................................... 26
8.
Failsafe AUTO Mode ........................................................................................................................................... 29
8.1.
Failsafe trigger thresholds ............................................................................................................................ 29
8.2.
Power up ...................................................................................................................................................... 29
8.3.
Triggering failsafe AUTO mode .................................................................................................................... 29
9.
Deadband mode .................................................................................................................................................. 30
9.1.
Settings ........................................................................................................................................................ 30
9.2.
Operation ..................................................................................................................................................... 30
9.3.
Initialisation .................................................................................................................................................. 31
10.
Setpoint Offset .................................................................................................................................................... 32
10.1.
Settings ........................................................................................................................................................ 32
10.2.
Operation ..................................................................................................................................................... 32
11.
Modbus RTU ....................................................................................................................................................... 34
11.1.
Modbus background ..................................................................................................................................... 34
11.2.
Modbus registers .......................................................................................................................................... 34
11.3.
Modbus connections .................................................................................................................................... 34
12.
Modbus register tables ...................................................................................................................................... 35
12.1.
Holding registers .......................................................................................................................................... 35
12.2.
Input registers ............................................................................................................................................... 39
12.3.
Discrete Inputs ............................................................................................................................................. 40
12.4.
Coils ............................................................................................................................................................. 41
Appendix A - Compatible Air-To-Air units ................................................................................................................. 42
Page 4
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