K2 Serial port problems

[Jim Purvis]

I've been using HRD and DM780 for a few months now on my new K2. It
has worked wonderfully. Suddenly I can no longer connect to the
radio.
I have checked and rechecked settings and connections. I'm using a
USB to serial adapter, but its the same one I have always used and it
works on other equipment. I have also tried a different adaper with
the same results.
The radio Com port controls the KAT100 tuner just fine. Cable
connections are all good and correct. Yes, its the 'special' cable
built for the K2 per the instructions, not just a off the shelf
serial cable. The Port is varified 'ON' using the Supplemental
parmeters. (Menu then Display)
I have upgraded (after things quit) HRD to Ver 4.0 SP3 Build 1875
with no change.
I have had the K2 apart and checked for anything out of place or
loose. Checked pin continuity to and from U4 on the PA board out
through J1 to the radio control board.
The error I get is; "Make sure your radio is switched on and not in
memory mode." Yes, it's on. I have been through the K2 manual and
find no ref to 'memory mode' other than store and recall a frequency.

So before I really dig into the radio with a meter and a scope can
anyone tell me more about 'memory mode', has anyone had a similar
problem, and any other suggestions.

I will be cross posting this on the HRG Group also.

Tnx
WA7HRG

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[Don Wilhelm-4]

Jim,

It could be either the computer (and serial adapter), or it could be the
K2 itself.
The best way to proceed is to check using the simplest configuration -
try the communications tests outlined in the KIO2 manual.  It would be
best if you can try it with a computer having a real serial port.  If
those tests are OK, then look to the computer and serial adapter.

Additional information - The K2 computer connection uses entirely
different signals than the connections to your KAT100.  The TXD and RXD
signals are the only ones involved with the computer communications and
the KAT100 does not use those signals at all - so the fact that the
cable works with the KAT100 does not provide any useful information.

HRD is simply giving you a generic message that indicates that it could
not connect.  Be certain the baud rate has not changed and the COM port
is the same one assigned to your USB to serial adapter.

73,
Don W3FPR

Jim Purvis wrote:

> I've been using HRD and DM780 for a few months now on my new K2. It
> has worked wonderfully. Suddenly I can no longer connect to the
> radio.
> I have checked and rechecked settings and connections. I'm using a
> USB to serial adapter, but its the same one I have always used and it
> works on other equipment. I have also tried a different adaper with
> the same results.
> The radio Com port controls the KAT100 tuner just fine. Cable
> connections are all good and correct. Yes, its the 'special' cable
> built for the K2 per the instructions, not just a off the shelf
> serial cable. The Port is varified 'ON' using the Supplemental
> parmeters. (Menu then Display)
> I have upgraded (after things quit) HRD to Ver 4.0 SP3 Build 1875
> with no change.
> I have had the K2 apart and checked for anything out of place or
> loose. Checked pin continuity to and from U4 on the PA board out
> through J1 to the radio control board.
> The error I get is; "Make sure your radio is switched on and not in
> memory mode." Yes, it's on. I have been through the K2 manual and
> find no ref to 'memory mode' other than store and recall a frequency.
>
> So before I really dig into the radio with a meter and a scope can
> anyone tell me more about 'memory mode', has anyone had a similar
> problem, and any other suggestions.
>
> I will be cross posting this on the HRG Group also.
>
>  

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