Minimum connections are :

1. pin 2 connected to pin 2 (this is the received data)
2. pin 3 connected to pin 3 (this is the transmitted data)
3. pin 5 connected to pin 5 (this can be the shield, ground signal)

With this cable you must use handshake off with MC

On the rig, switch OFF the RTS menu 

Reccomended connections are :

1. pin 2 connected to pin 2 (this is the received data)
2. pin 3 connected to pin 3 (this is the transmitted data)
3. pin 5 connected to pin 5 (ground signal)
4. pin 7 connected to pin 7 (this is the "request to send" for handshake)
5. pin 8 connected to pin 8 (this is the "clear to send" for handshake)
6. Shield wire can be connected to the shield of the connectors