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

[Dick Dievendorff]

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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