modbus_new_tcp_pi man page on DragonFly

modbus_new_tcp_pi man page on DragonFly

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MODBUS_NEW_TCP_PI(3)	       Libmodbus Manual		  MODBUS_NEW_TCP_PI(3)

NAME
       modbus_new_tcp_pi - create a libmodbus context for TCP Protocol
       Independent

SYNOPSIS
       modbus_t *modbus_new_tcp_pi(const char *node, const char *service);

DESCRIPTION
       The modbus_new_tcp_pi() function shall allocate and initialize a
       modbus_t structure to communicate with a Modbus TCP IPv4 or Ipv6
       server.

       The node argument specifies the host name or IP address of the host to
       connect to, eg. 192.168.0.5 , ::1 or server.com.

       The service argument is the service name/port number to connect to. To
       use the default Modbus port use the string "502". On many Unix systems,
       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_pi() 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
	   The node string is empty or has been truncated. The service string
	   is empty or has been truncated.

EXAMPLE
	   modbus_t *ctx;

	   ctx = modbus_new_tcp_pi("::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_tcp(3) 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_PI(3)

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