1500 series serial plug connections:=20

Pin 2=A0 - Data Rx
Pin 3=A0 - Data Tx
Pin 5=A0 - 5v Negative (and Data Ground)
Pin 8=A0 - 5v Positive

If in doubt, get a lead from Severn Valley Salplanes (from whom I got this=20
information in the first place).

Nice to meet a fellow 1500 user!

Mike