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# modbus_mask_write_register
## Name
modbus_mask_write_register - mask a single register
## Synopsis
```c
int modbus_mask_write_register(modbus_t *ctx, int addr, uint16_t and, uint16_t or);
```
## Description
The *modbus_mask_write_register()* function shall modify the value of the
holding register at the address 'addr' of the remote device using the algorithm:
new value = (current value AND 'and') OR ('or' AND (NOT 'and'))
The function uses the Modbus function code 0x16 (mask 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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