This is the PL171 cable for MCU #A-1016-8100. It is a 20 meter cable for MCU.

These straight cables have a 9-pin D-type socket at end ‘A’ with a 9-pin D-type plug at end ‘B’ and are connected pin-to-pin. They are used as dedicated cables for the Renishaw MCU1 joystick unit, signal information is shown below.