In case anyone else needs to know the wiring connections I have now found that they are as follows -
RJ pin 2 connects to serial pin 7 (RTS), RJ pin 3 connects to serial pin 2 (RXD), RJ pin 4 connects to serial pin 3 (TXD), RJ pin 5 connects to serial pin 4 (DTR). I now have the station connected to my computer.