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SK2019 FCSD(H)-V/P-ECM-001
Open Modbus protocol
Transfer Mode: RTU, BAUD Rate: 9600bps, 8 data bit, 1 stop bit, None parity bit
The communications require a delay of 80ms between reading an answer and sending the next command. All
temperatures are 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 are used to test unit
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 successful
Write data did not succeed
Coils table:
Description
Address
Type*
Remark
Unit ON/OFF
100000
R/W
Sleep mode
100001
R/W
Louver swing
100002
R/W
Reserved
100003 to 100015
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
PRO
200007
R
Float switch
200008
R
Reserved
200009
R
EH safety switch
200010
R
Unit ON/OFF status
200011
R
Testing purpose only.
* R = read only, W = write only, R/W = read and write.
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