Pin 6 doesn't connect to anything on a DB9. I have a PIC16F84
talking with my HP7475a -- you just need TxD, RxD, Signal Ground and
CTS hooked up (well, you don't even need RxD hooked up since the
HP7475a is just receiving.) For those of you who are interested, I
just have a MAX232, pin 2 (+ 10V from the charge pump) to assert
a "SPACE" to pin 4 of the DB9.
talking with my HP7475a -- you just need TxD, RxD, Signal Ground and
CTS hooked up (well, you don't even need RxD hooked up since the
HP7475a is just receiving.) For those of you who are interested, I
just have a MAX232, pin 2 (+ 10V from the charge pump) to assert
a "SPACE" to pin 4 of the DB9.