[G0HZU_JMR]

OK I just buzzed out the J1-J1 bus cable and it is indeed a 1 to 1 cable. I took some time over this and marked up the edge connector every 5 pins to make sure I didn't lose synch between cables.

It buzzes out 1:1 and also the screen shells show good conductivity from end to end and they also have conductive screen plates as per the images above (the long shiny metal plates running the length of the blue body) to ensure a solid screen connection around the outside of the whole assy and the screen of the cable.

The plates mate with the outer body of the connector on the analyser to give a solid screen connection from the screen on the cable to the analyser chassis.

There is no connectivity from the outer screen on the cable to any of the bus pins when the cable is tested in isolation from the analyser.