gwOpen (Function)

This function will open a connection to the RTCU Communication Hub, using the configuration set with sockSetGWParm, rchConfigSet or rchFallbackSet.

Also see gwClose for closing the connection to the RTCU Communication Hub.

Input:        

None.

Returns: INT

Declaration:

FUNCTION gwOpen : INT;
 

Example:

INCLUDE rtcu.inc
 
PROGRAM test;
VAR
   timer    : clockDayTimer;
   rc       : INT;
END_VAR;

 
   // Initialize
   timer(enable:=ON, start_hour:=12, start_minute:=0, stop_hour:=13, stop_minute:=30);
 
BEGIN
   // Manage RTCU Communication Hub connection
   timer();
   IF timer.q THEN
      IF NOT gwIsOpen() THEN
         DebugMsg(message := "Starting connection");
         rc := gwOpen();
         IF rc < 1 THEN
            DebugFmt(message := "  gwOpen=\1", v1 := rc);
         END_IF;
      END_IF;
   ELSE
      IF gwIsOpen() THEN
         DebugMsg(message := "Stopping connection");
         rc := gwClose();
         IF rc < 1 THEN
            DebugFmt(message := "  gwClose=\1", v1 := rc);
         END_IF;
      END_IF;
   END_IF;

 
   IF gwConnected() THEN
      // Connection is ready for work
   END_IF;
END;
END_PROGRAM;