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MODBUS_CONNECT(3)	       libmodbus Manual		     MODBUS_CONNECT(3)

NAME
       modbus_connect -	establish a Modbus connection

SYNOPSIS
       int modbus_connect(modbus_t *ctx);

DESCRIPTION
       The modbus_connect() function shall establish a connection to a Modbus
       server, a network or a bus using	the context information	of libmodbus
       context given in	argument.

RETURN VALUE
       The function shall return 0 if successful. Otherwise it shall return -1
       and set errno to	one of the values defined by the system	calls of the
       underlying platform.

EXAMPLE
	   modbus_t *ctx;

	   ctx = modbus_new_tcp("127.0.0.1", 502);
	   if (modbus_connect(ctx) == -1) {
	       fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
	       modbus_free(ctx);
	       return -1;
	   }

SEE ALSO
       modbus_close(3)

AUTHORS
       The libmodbus documentation was written by Stphane Raimbault
       <stephane.raimbault@gmail.com>

libmodbus v3.1.7		  04/12/2025		     MODBUS_CONNECT(3)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=modbus_connect&sektion=3&manpath=FreeBSD+Ports+14.3.quarterly>

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