[Elecraft] Adding DSR (serial port line 6) interrupt in a Firmware Update?

[Joe Subich, W4TV]

Lance, 

> That also was what I saw....so that standard pin is currently 
> free to have that interrupt capability added.

There is no hardware available to support and interrupt 
output on DSR.  It simply does not exist - no free outputs 
on the MCU and no driver for the software to activate.  

> Frankly, I am a bit surprised that it wasn't already 
> built in,

Why would any transceiver incorporate a full three pair 
(TxD/RxD, RTS/CTS, DTR/DSR) interface if it had no need 
for it?  Kenwood and the recent Yaesu rigs use RTS/CTS 
handshake but I can't think of any transceiver that even 
implements DTR/DSR.

73, 

   ... Joe, W4TV 
  



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Lance Collister
> Sent: Friday, February 06, 2009 9:44 AM
> To: Dick Dievendorff
> Cc: 'Elecraft Group'
> Subject: Re: [Elecraft] Adding DSR (serial port line 6) 
> interrupt in a Firmware Update?
> 
> 
> That also was what I saw....so that standard pin is currently 
> free to have that 
> interrupt capability added.  Frankly, I am a bit surprised 
> that it wasn't already 
> built in, since the K3 incorporates so many features to try 
> to create flexibility 
> and eliminate the need for external computer interfaces.  
> However, I think it is 
> very encouraging to see that pin #6 is not currently used for 
> some other unusual 
> application, and is still available for this feature to be 
> added.  I hope that 
> there is some way that it can be provided.
> 
> VY 73, Lance
> 
> Dick Dievendorff wrote:
> > If I read the KIO3-D Sub RS232 IO Board schematic 
> correctly, pin 6 of 
> > J24 (the 9-pin RS-232 connector) is not connected to 
> anything inside 
> > the K3. The labeled (connected) pins are:
> > 
> > 2 (RXD OUT)
> > 3 (TXD IN)
> > 4 (DTR IN)
> > 5 (COMMON)
> > 7 (RTS IN)
> > 
> > Dick, K6KR
> > 
> > 
> > -----Original Message-----
> > From: elecraft-bounces at mailman.qth.net 
> > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of 
> Lance Collister
> > Sent: Thursday, February 05, 2009 7:26 PM
> > To: 'Elecraft Group'
> > Subject: [Elecraft] Adding DSR (serial port line 6) interrupt in a 
> > Firmware Update?
> > 
> > I recall that there was an email recently that the K3's 
> internal DVR 
> > was
> > interrupted when the microphone or footswitch is activated 
> to manually
> > transmit. 
> > I am very interested to learn if it might be possible at 
> the same time to
> > also 
> > send an interrupt signal to the unused DSR line (serial pin 
> #6).  This
> > interrupt 
> > is used by several computer programs (TRX-Manager, 
> Multikeyer, Voice Keyer 
> > Express) at my station that automatically key the rig and 
> send CW (via the
> > DTRor 
> > SSB messages.
> > 
> > Although these programs have primarily been used here for 
> VHF meteor 
> > scatter
> > 
> > schedules, they are also very handy for working contests and other 
> > band openings.
> >   The K3 is of course well suited to work with any such external 
> > computer programs due to its built-in audio interface.  
> However, when 
> > the operator switches to
> > 
> > manually keying the K3, it would be really great if an 
> interrupt could 
> > be sent to the computer programs via the serial port so 
> that they stop 
> > their automatic keying
> > of the PTT line and also stop sending audio or CW signals 
> to the K3.  Adding
> > a 
> > computer interrupt on the (currently unused) DSR line would 
> accomplish this
> > and 
> > broaden the flexibility of the K3.  Thanks for your kind 
> consideration!
> > 
> > VY 73, Lance
> > 
> 
> 
> -- 
> Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, 
> WA1JXN/C6A, ZF2OC/ZF8) P.O. Box 73 Frenchtown, MT  59834  USA
> QTH: DN27UB
> TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
> 2m DXCC #11, 6m DXCC #815
> 
> 
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