The problem being we can't seem to enter commands, although all the text appears on the screen correctly, I am told that if you connect a laptop to the port on site then this also works correctly. We have a number of sites where this is a problem, we have tried to replicate in the lab but can't get it to fail. For pin outs etc see Steve Evans.
This gives details of connectivity on site.
Connected to STNWES-L3234-02 MPM1 on 126.96.36.199 port 2071
login: command not found