SP80 LED control

The SP80 probe has a tri-colour LED which can be controlled by the user to act as a visual aid for measurement applications.
The LED can be set to red, green or orange depending on the following inputs to pins 9 and 10 of the 26-way ‘D' plug.

(Logic ‘1' = +3 V to +5 V Logic ‘0' = <0.8 V)