Polar Air SWC-12-EC-I, Installation, Operation & Service Manual

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B.11. Open Modbus Protocol
Transfer Mode: RTU BAUD Rate:9600bps, 8 data bits, 1 stop bit, None parity bit
The communications require a delay between reading an answer and sending the next command of 80 ms. All temperature is equal to reading data*10
accuracy: 0.1 degree C.
Supported Functions
Function Code Function description
01(01H) Read Coils
02(02H) Read Discrete Inputs
03(03H) Read Holding Registers
04(04H) Read Input Registers
05(05H) Write Single Coil
06(06H) Write Single Register
15(0FH) Write Multiple Coils
16(10H) Write Multiple Registers
255(FFH) Extended Commands which is used to test.
Valid Error code table:
Error code description definition
01 (01H)
Invalid commands Received commands beyond valid commands
02 (02H)
Invalid data address Data addresses beyond valid data address
03 (03H)
Invalid data Data beyond definition range
04 (04H)
Write data not succeed Write data not succeed
Coils table:
Description Address Type* Remark
ON/OFF 100000 R/W
Sleeping mode 100001 R/W
Louver swings 100002 R/W
Energy Saving Mode 100003 R/W
PRO function 100004 R/W
Discrete table:
Description Address Type* Remark
MTV1 200000 R
MTV2 200001 R
AUX1 200002 R
AUX2 200003 R
Condensate pump 200004 R
Electrical heater 200005 R
Wired wall pad 200006 R
PR-O1 200007 R
Float switch 200008 R
Reserved 200009 R
EH safety switch 200010
R
Internal test 200011 R Testing purpose only.
Holding Register table:
Description Address Type* Remark
Mode setting 300000 R/W
Cooling mode = 01(H), Humidify mode = 02(H), Fan mode = 04(H),
Heating mode = 08(H), Auto mode = 10(H)
Fan speed setting 300001 R/W
Low speed = 04(H), Medium speed = 02(H), High speed = 01(H)
Auto fan speed = 07(H)
Louver swing setting 300002 R/W
Position1=01(H), Position2=02(H), Position3=03(H),
Position4=04(H), Auto=0F(H), Stop=00(H)
Setting temperature 300003 R/W 16~30 (actual*10 format)
Address setting 300004 R/W 1~255
Reset 300005 W =0x33 reset error
Reserved 300006 W
Reserved 300007 W
Reserved 300008 W
Reserved 300009 W
Hours in Timer on 300010 R/W Timer ON
Minute in Timer on 300011 R/W Timer ON
Hours in Timer off 300012 R/W Timer OFF
Minute in Timer off 300013 R/W Timer OFF
Icon of Timer ON or OFF 300014 R/W
BIT0 = Icon of Timer ON, BIT1 = Icon of Timer OFF,
1 = enable, 0 = disable
Minimum output DA1 300015 R/W Default 25% (2.5vdc)
Minimum output DA2 300016 R/W Default 25% (2.5vdc)
Pre-heat temperature setting 300017 R/W 25~35, default: 30
2019-IOM-SWC-V-EC-I-001