[aprssig] D700 Control
rgilson at adelphia.net
Sat Sep 10 18:50:51 CDT 2005
At one time when computers used a DB25 serial connector in place of the current DB9, a switch box was also made with LEDs and switches that reversed RX, TX data along with CLS, DTR, DSR and a few other signals. With progress to the DB9 some one forgot about these handy little boxes and I have not seen one in 10 years. Too bad because these were very helpful. Be thankful that you don't need handshaking on pin 4. The D7 goes from -12 to +12 vdc to control some GPS receiver data out. I found out after spending too much time spinning my wheels with a DeLorme, Good luck,
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