modbus_new_tcp man page on DragonFly

modbus_new_tcp man page on DragonFly

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MODBUS_NEW_TCP(3)	       Libmodbus Manual		     MODBUS_NEW_TCP(3)

NAME
       modbus_new_tcp - create a libmodbus context for TCP/IPv4

SYNOPSIS
       modbus_t *modbus_new_tcp(const char *ip, int port);

DESCRIPTION
       The modbus_new_tcp() function shall allocate and initialize a modbus_t
       structure to communicate with a Modbus TCP/IPv4 server.

       The ip argument specifies the IP address of the server to which the
       client wants etablish a connection.

       The port argument is the TCP port to use. Set the port to
       MODBUS_TCP_DEFAULT_PORT to use the default one (502). It’s convenient
       to use a port number greater than or equal to 1024 because it’s not
       necessary to have administrator privileges.

RETURN VALUE
       The modbus_new_tcp() function shall return a pointer to a modbus_t
       structure if successful. Otherwise it shall return NULL and set errno
       to one of the values defined below.

ERRORS
       EINVAL
	   An invalid IP address was given.

EXAMPLE
	   modbus_t *ctx;

	   ctx = modbus_new_tcp("127.0.0.1", 1502);
	   if (ctx == NULL) {
	       fprintf(stderr, "Unable to allocate libmodbus context\n");
	       return -1;
	   }

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

SEE ALSO
       modbus_new_rtu(3) modbus_free(3)

AUTHORS
       The libmodbus documentation was written by Stéphane Raimbault
       <stephane.raimbault@gmail.com[1]>

NOTES
	1. stephane.raimbault@gmail.com
	   mailto:stephane.raimbault@gmail.com

libmodbus 3.1.0			  10/06/2013		     MODBUS_NEW_TCP(3)

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