On 2020-05-23 15:18, Craig Leres wrote: > I think I could still feed the J1850 bus on pin 1 of the DB9. I see now that pin 1 of DB9 is open on a V3.1 module (as is shown in the V3.1 schematic). Is the correct update to run a jumper from pin 21 of DA26 to pin 1 of DB9? Craig