An Icom PMR set that seems good for 1200bd/9600 Packet
Short version:
If you don't have an OPC617 cable you can connect direct to the connector on the board as follows:
Here is an example of such a home-brew connection:
The connector is an 11 pin JST ZH plug, but any size down to a 5 pin JST ZH can be used for connecting to NinoTNC (only pins 7,8,9 and 11 are needed)