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(3) modbus_write_registers(3)

AUTHORS

       Martijn de Gouw <martijn.de.gouw@prodrive.nl> The libmodbus documentation was written by
       Stéphane Raimbault <stephane.raimbault@gmail.com>