Modbus RTU Command
Baud Rate: 9600 8 NONE 1
Send hex
Hexadecimal reception
Steps:
1. Software setting the baud rate
2. Set the address (device address used to communicate)

Set the address is: 01
00 06 40 00 00 01 5c 1b
Set the address is: 02
00 06 40 00 00 02 1c 1a
Read address
00 03 40 00 00 01 90 1b

Read the software version
00 03 00 04 00 01 c4 1a // [month] broadcast read (only by one device, for all addresses practical, easy to test)
0,003,000,800,010,419 [years] // broadcast read (only by one device, for all addresses practical, easy to test)
00 03 00 10 00 01 84 1e [hour, minute] // broadcast read (only by one device, for all addresses practical, easy to test)
Read the hardware version (PCB version)
0,003,002,000,018,411 // broadcast read (only by one device, for all addresses practical, easy to test)

[1 Address]
The 1st relay open
01 05 00 01 01 00 9d 9a
Relay 1 closed
01 05 00 01 00 00 9c 0a
The 2nd relay open
01 05 00 02 01 00 6d 9a
2 Relay Off
01 05 00 02 00 00 6c 0a
The 3rd relay open
01 05 00 03 01 00 3c 5a
3 Relay Off
01 05 00 03 00 00 3d ca
4 relay open
01 05 00 04 01 00 8d 9b
4 Relay Off
01 05 00 04 00 00 8c 0b
All off
01 05 00 ff 00 00 fd fa
All light
01 05 00 ff ff ff fc 4a