modbus_write_register - Man Page

write a single register


int modbus_write_register(modbus_t *ctx, int addr, const uint16_t value);


The modbus_write_register() function shall write the value of value holding registers at the address addr of the remote device.

The function uses the Modbus function code 0x06 (preset single register).

Return Value

The function shall return 1 if successful. Otherwise it shall return -1 and set errno.

See Also

modbus_read_registers(3) modbus_write_registers(3)


The libmodbus documentation was written by Stéphane Raimbault <>

Referenced By

libmodbus(7), modbus_read_input_registers(3), modbus_read_registers(3), modbus_write_and_read_registers(3), modbus_write_registers(3).

01/25/2024 libmodbus v3.1.7 libmodbus Manual