modbus_mask_write_register - Man Page
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
Authors
Martijn de Gouw <martijn.de.gouw@prodrive.nl> The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>
Info
01/25/2024 libmodbus v3.1.7 libmodbus Manual