Most SCADA and HMI on the market can only connect to the M-series PLC via serial port but not via the XServer or TLServer. XServer and TLServer uses proprietary encryption for logging in and it support mainly the native protocol and hence is not made compatible with these packages.
However, if the SCADA or HMI support the MODBUS/TCP, you can buy a MODBUS/TCP to serial (RS232) MODBUS converter.( I believe LANTRONIX sell such a box but there should be a number of suppliers on the market) to interface to the M-series PLC via RS232. This will be transparent to the PLC as the converter box will take care of the TCP/IP and convert the protocol to serial MODBUS that the PLC supports.