Computer interface problem with KX3/KXPA100

[peterc281]

A guy at the radio club is trying to get N1MM working and when he switches on the KXPA100 the computer serial port fails.
We have confirmed all the cables will work independently ie. The KX3 responds when connected to computer and the KX3 controls the PA. But, as soon as the PA is switched on the port fails as shown in the computer device manager.

[Don Wilhelm]

Make certain that the pug is fully inserted into the ACC1 jack on the
KX3 and the RS-232 jack on the KXPA100. Also that the RJ-45 plug is
fully latched into the Control jack.

On 5/15/2016 4:16 AM, peterc281 wrote:
> A guy at the radio club is trying to get N1MM working and when he switches on
> the KXPA100 the computer serial port fails.
> We have confirmed all the cables will work independently ie. The KX3
> responds when connected to computer and the KX3 controls the PA. But, as
> soon as the PA is switched on the port fails as shown in the computer device
> manager.
>

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[peterc281]

Further info... We have upgraded the KX3 to the latest revision and checked the KXPA100 which is current to the latest software. The computer is connected to the PC port on the KXPA100.

[Bob N3MNT]

Be sure the baud rate is set at 38400  The KX3 can connect at lower rates, but the KXPA is looking for 38400.  Are you turning on amp via KX3 or the switch on the amp.  Should be turning on via KX3

[lstavenhagen]

If you're getting the big yellow bang by the device in "device mangler", that points more to a failure in the driver for the USB device in the machine, or a problem with the device itself inside the box. The plug could be marginal after heavy use, or the driver may be corrupt, or the USB hub could have a problem of some kind, etc.

What I'd do to troubleshoot at that point is try the setup on a different computer, or on a different USB port on the machine that you know is separate physically from the troublesome one. Just trying a different computer with known-good hardware in it would probably be the easiest next step to take.

73,
LS
W5QD