Operation Holding Register - Ebyte E150-400T30S User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd.
Note: the CRC check code of the last two bytes of the sending instruction needs to be calculated by
the user.
Serial port sending: 01 03 0b 72 00 01 26 35
Remote wireless transmission: 01 03 0b 72 00 01 26 35
After sending the above command to the device via serial port or wireless, the device will return the
following values to the serial port or wireless:
01
Device MODBUS Function
address
Phenomenon: return the baud rate value, 03 represents the baud rate of 9600 bps.
Serial port receiving return value: 01 03 02 00 03 F8 45
Remote wireless reception return value: 01 03 02 00 03 F8 45

5.5 Operation holding register

It supports the function code operation of operating a single register (06) and operating multiple
registers (10).
 Using 06 function code to write a single holding register, for example: set to change the working
mode of the equipment
01
Device MODBUS Function
address
Note: the CRC check code of the last two bytes of the sending instruction needs to be calculated by
the user.
Serial port sending: 01 06 07 E8 00 00 F8 8A
Remote wireless transmission: 01 06 07 E8 00 00 F8 8A
After sending the above command to the device via serial port or wireless, the device will return the
following values to the serial port or wireless:
01
Device MODBUS Function
address code
Phenomenon: switch the working mode of the module to the normal mode.
Serial port receiving return value: 01 06 07 E8 00 00 F8 8A
Remote wireless reception return value: 01 06 07 E8 00 00 F8 8A

command to write multiple holding registers using 10 function code, for example: set the output
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
03
Number of
code bytes of data
06 07 E8
Register
code address
06 07 E8
Register
address
02 00 03
Returned data
00 00
Write
value
00 00
Write value
E150-400T30S user manual
F8 45
CRC check
code
F8 8A
CRC check
code
F8 8A
CRC check
code
13