Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help 
modbus_mask_write_register()			    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_mask, uint16_t or_mask);

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 algo-
     rithm:

     new  value  =  (current  value  AND  'and_mask')  OR  ('or_mask'  AND  (NOT
     'and_mask'))

     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>

						    modbus_mask_write_register()

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=modbus_mask_write_register&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

home | help