Well - I think he said the computer crashed so didn't have it to hook up - if it was going to an rj45 on the far end then it would be best to get an adapter for the EM end. It would normally be
VM PMS
2 to 3
3 to 2
5 to 7

However you would have to convert that to the appropriate pins on the rj45

Remember you will have to dial in to the Ex Mess and set the serial port to PMS