modbus_mask_write_register

Name

modbus_mask_write_register - mask a single register

Synopsis

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_write_registers