Usage

This tag communicates with a serial port on the server.  Any device that can be attached to a serial port could be controlled or manipulated with this tag.  The PORT is the COM port number to address on the server.  This could be used to send signals to a PLC device, or read values from a temperature gauge attached to the serial port.

DATA is a required "string" to "write"
 DATA is the ascii code of the character to "send"
 DATA is not required for "length"  for read:
 DATA is optional length if positive, or ascii character to stop at 
 if 0 or < 0, if not present at all, (""), then all data is read