I have write a program with windows socket to access Digi PoerServerII port. For example, loop port1 send and receive signal, send data to TCP port 2101 of a portserver and then receive from it. I found that if I send more bytes in one TCP packet, the port does not work. For example, if send more than 25 byte to one port under 9600 baudrate, this port does not work.
If anyone find this solution for this problem?