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# modbus_write_register
## Name
modbus_write_register - write a single register
## Synopsis
```c
int modbus_write_register(modbus_t *ctx, int addr, const uint16_t value);
```
## Description
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](modbus_read_registers.md)
- [modbus_write_registers](modbus_write_registers.md)
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