#287211 - 27/09/200621:56Re: program reads from serial port fine out of car, not in car
[Re: wfaulk]
tfabris carpal tunnel
Registered: 20/12/1999
Posts: 31618
Loc: Seattle, WA
Quote: As I said, null modem connectors loop some of the other connectors back to the empeg side.
I'm confused. He said he's using the sled in the car. When I look at this wiring diagram, it shows that the only things connected to pins 1 and 4 at the empeg side are the phone mute line and the ignition sense.
I could understand how having those two things go high or low could theoretically mess up an external device. But I don't see how a null-modem cable looping anything to either of those pins would mess up serial communication on the empeg?