STAMOS S-LS-96 Manual De Instrucciones página 54

The returned data includes: slave device address, function code, data area,
and CRC code. The data in the data area is two bytes, with the first having
higher priority.
g) Break time requirements
A data bus interrupt is required before data is sent, which must be greater
than the baud rate (for 9600bps, the interrupt is min. 5ms).
3. Introduction to Modbus protocol function codes
Caution: The power supply supports only the Modbus protocol function
codes described below.
a) Function code "03": reading of multi-channel register inputs
E.g.: the master device needs to read data from 6 registers of the slave
device whose address is 01 and start address is 1000.
The address and data of the slave's data register are:
Register address
1000H
1001H
1002H
1003H
1004H
1005H
Note: the set voltage and current must be multiplied by 100 and then
converted to hexadecimal notation before writing to the register.
E.g.. To set the voltage to 30.00V, multiply 30 by 100 to get 3000, then
convert to hex to get 0BB8.
According to the above table, the value should be written to register
1000H.
Data register
(hexadecimal)
0BB8 (3000) Set-U
voltage multiplied by
100
03E8(1000) current
Set-I multiplied by
100
0BB8(3000) voltage U
times 100
03E8(1000) current I
multiplied by 100
0001 (ON) – power
supply on
0000 (CV) control
status
Corresponding
parameters
Set-U (30.00V)
Set-I (10.00A)
U(30.00V)
I(10.00A)
Run-Stop (1)
CC0CV-OC (1)