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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
01 (01H)
Invalid commands
02 (02H)
Invalid data address
03 (03H)
Invalid data
04 (04H)
Write data not successful
Coils table:
Description
Unit ON/OFF
Sleep mode
Louver swing
Reserved
Discrete table:
Description
MTV1
MTV2
AUX1
AUX2
Condensate pump
Electrical heater
Wired wall pad
PRO
Float switch
Reserved
EH safety switch
Unit ON/OFF status
* R = read only, W = write only, R/W = read and write.
Address
Type*
100000
R/W
100001
R/W
100002
R/W
100003 to 100015
Address
Type*
200000
R
200001
R
200002
R
200003
R
200004
N/A
200005
R
200006
R
200007
R
200008
R
200009
R
200010
R
200011
R
Definition
Received commands beyond valid commands
Data addresses beyond valid data address
Data beyond definition range
Write data did not succeed
Remark
Remark
Testing purpose only.
Page 45 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
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