[Elecraft] KRC2 setup for Icom

[Rich]

Installed Jumpers

W1,2,3   W11,12, 19,20

DB9 from Icom Radio  Pin 4= 8v ref,  Pin9= Icom Band Voltage Pin1=GND

Do you mean a straight through cable from PC to KRC2?   I am sure I did 
not break anything.  I only had Pin 2 and 3 set for straight and null.   
Those pins should certainly not have 12v on them.  I hope

Rich

On 4/21/2020 18:58 PM, Jack Brindle wrote:
> Rich;
>
> What are the jumper settings in the KRC2?
>
> It is _very_ important not to use a straight-through cable with the KRC2. As documented in the KRC2 manual, the pins are connected to the microcontroller, and the +/- 12 V excursions of the RS-232 levels will damage the microcontroller I/O pins.
>
> There are two voltages you need from the Icom, the band Voltage, and the reference voltage. The band voltage output from some Icom radios have been shown to drift during transmit, so much that they may show a completely different band. For this reason the band reference voltage (+8V) needs to be used. It is this voltage that drifts, and thus the Band voltage follows.
>
> With that in mind, the W9 - W22 jumper settings are important and will connect/disconnec the various pins to the DE9 connectors from the microcontroller.
>
> 73!
> Jack, W6FB
>
>
>> On Apr 21, 2020, at 3:11 PM, Rich <rwnewbould at comcast.net> wrote:
>>
>> Does anyone have any experience using the KRC2 with an Icom radio?  This is a working KRC2 that was on a K3 at one time.
>>
>> To start I cannot get the KRC2 to connect to my PC.  I have used straight through cable, Null modem Cable and a USB to Serial Cable.  I have run the program on an old XP laptop and my Win10 machine.   I have even used a "real" comport.  None of those configurations will connect to the device.   The DL switch is set properly.
>>
>> The KRC2 passes all of the manual button press tests.
>>
>> I have the jumpers set for ICOM on KRC2 board.  The ICOM is sending the band voltage to the unit as measured with a Volt meter.
>>
>> Do you really need the computer to make it work?  I am thinking that is mainly for firmware and antenna relay settings
>>
>> I am just trying to control a 419B bandpass filter.
>>
>> Any thoughts?
>>
>> Rich
>>
>> K3RWN
>>
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