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SIM Inverter Monobloc Air-to-Water Heat Pump
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Vesion 1.7 update: 2020.1.1
1. Transmission Format
Baud Rate 9600bps
Start bit 1
Byte width 8
Parity N
Stop bits 1
Network address H15
2. Packet Format
Address Function Data CRC checksum
16bits
16bits
03:Function of reading multi registers
16:Function of presenting multi registers
06:Function of presenting single
N*16bits 16bits
Address Function HEX Number Content Description Remark
1011 03/16/06 3F3 ON/OFF 0-off/1-on DIGI1
1012 03/16/06 3F4 Mode
0-hot water/1-heating/2-cooling/3-hot water+heating/4-
hot water+cooling
DIGI1
1013 03/16/06 3F5 Timer mute 0-start 1-exit DIGI1
1014 03/16/06 3F6 Reserved
1015 03/16/06 3F7 Reserved
1016 03/16/06 3F8 Reserved
1017 03/16/06 3F9 Reserved
1018 03/16/06 3FA H01 Whether with power-down memory 0-without memory/1-with memory DIGI1
1019 03/16/06 3FB H02 Master and member parameters 0-master/1-member DIGI1
1020 03/16/06 3FC H03 Unit conversion 0-°C/1-°F DIGI1
1021 03/16/06 3FD H04 Four way valve 0-heating lost electricity/1-heating got electricity DIGI1
1022 03/16/06 3FE H05 Three-way valve polarity control 0-heating water lost electricity/1-heating water got electricity DIGI1
1023 03/16/06 3FF H06 Compressor frequency control P value 1~100 DIGI1
1024 03/16/06 400 H07 Compressor frequency control I value 1~100 DIGI1
1025 03/16/06 401 H08 Compressor frequency control D value 0~100 DIGI1
1026 03/16/06 402 H09 Compressor minimum frequency 20~60Hz DIGI1
1027 03/16/06 403 H10 Compressor maximum frequency 30~120Hz DIGI1
1028 03/16/06 404 H11 Compressor model selection 0~99 DIGI1
1029 03/16/06 405 H12 Manual compressor frequency 0~90Hz DIGI1
1030 03/16/06 406 H13 PFC enable 0~1 DIGI1
1031 03/16/06 407 One-button electric heating 0-off/1-on DIGI1
1032 03/16/06 408 H15 Unit Address 1~99 DIGI1
1033 03/16/06 409 H16 Hot water function 0-disable 1-enable DIGI1
1034 03/16/06 40A H17 Cooling mode 0-disable 2-enable DIGI1
1035 03/16/06 40B Reserved
1036 03/16/06 40C Reserved
1037 03/16/06 40D Reserved
1038 03/16/06 40E Reserved
1039 03/16/06 40F Reserved
1040 03/16/06 410 A01 Outlet water antifreeze temperature point -10~10°C TEMP1
1041 03/16/06 411 A02 Antifreeze low value 0~10bar TEMP1
1042 03/16/06 412 A03 Anti-freeze protection return difference 0~10°C TEMP1
1043 03/16/06 413 A04 Ambient temperature at which the heat pump stops working -30~10°C TEMP1
1044 03/16/06 414 A05 Exhaust temperature too high protection set value 80~130°C TEMP1
1045 03/16/06 415 A06 Spray valve opening temperature 10~50°C TEMP1
1046 03/16/06 416 Reserved
1047 03/16/06 417 Reserved
1048 03/16/06 418 Reserved
3. Important Note:
All temperatures values in the MODBUS registers are stored as tenths of a degree Celsius, regardless of whether the unit is set to display Fahren-
heit or Celsius.
Therefore, a temperature value such as register 1192 = Heating Target Temperature may be stored as 500. Divide this value by 10 and you get
50.0°C. To determine the equivalent value in Fahrenheit, multiply this value by 9/5, to get 90, then add 32. The Fahrenheit temperature is 122°F.
If you wish to change the target temperature to 115°F, rst subtract 32 to get 83, then multiply by 5/9. The Celsius temperature is 46.1°C, multiply
this by 10 and enter the value 461.
When a value represents a difference between two temperatures, such as register 1194, Start temperature differential, the conversion from Celsius
to Fahrenheit is simply, multiply by 9/5, and from Fahrenheit to Celsius is multiply by 5/9.
For example, if the default value is 36, divide this by 10 and it represents 3.6 deg Celsius difference, multiply by 9/5 to get 6.5 deg Fahrenheit
difference. Conversely, if you want to set this value to 5 deg Fahrenheit differential, multiply by 5/9 to get 2.8 deg Celsius differential. Divide this by
10, and set the register value to 28.
Modbus RTU Protocol
4. Mailing Address
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