Best I recall there was a choice between hardwiring COR to the TNC or using internal Data Carrier Detect for the TNC to recognize activity on the radio channel. This was an input signal from the radio to the TNC. Way back when....Steve NU5D
Nate Duehr wrote: > Nate Bargmann wrote: > >> * Ron Wright <[EMAIL PROTECTED]> [2007 Aug 03 08:48 -0500]: >> >>> Nate, >>> >>> I looked in my KPC-3+ manual and they do call out a DCD line on both the >>> RS232 DB25 connector, pin 8, and also on the 9 pin radio connector. >>> However, I cannot find any reference to it in the manual. Probably there, >>> but cannot find. Wonder why they could put in a simple chart saying "pin >>> 1, does this, lo or high to turn on/off". >>> >>> In the RS232 spec the pin 8, known as CD, is Receive Line Signal Detector. >>> It does take the unit on/off line. >>> >>> So I am assuming if the CD (DCD here) is in off state then the TNC will not >>> do anything including receive or transmit??? >>> >> Perhaps this was dropped in the newer KPC-3 command set, but my old >> KPC-2 version 5.0 has this to say about the CD command: >> >> CD INTERNAL | EXTERNAL | SOFTWARE v3.0 >> >> ... >> >> When set to EXTERNAL, the carrier detect is supplied by an external >> device, connected to the XCD pin on the radio port. >> > > That's what I remember also... my KPC-9612 is so old, I have no idea > what firmware is in it. Last time I checked the internal battery was > dead, and it's been sitting on a shelf for years... > > I have lots better ways to move bits around these days than ham radio... > sadly. > > Nate > > > >
