Unknown process, sending data series to my instruments

I have a couple of test stations that I develop software to test at the moment.  When I'm actually under them, there is no problem with the serial communication.

However, if I let any of test stations on without the software running for an extended period of time, I'll check back often to find that one of my series devices (a 2510-AT Keithley) locked.  For awhile, I thought it was defective devices (strange that both had the same problem), until I found that if I left the serial cable unplugged it will break lock.

I borrowed a tap from a colleague data (the version 9 pins on this) and attached a laptop for the link over the weekend, using PuTTY to monitor communications.  I'd keep a log of what it has, and I enclose below.  The first 3 lines have been sending me * IDN? queries to verify that the data tap and others were working.  I edited on the serial number, just in case, but the rest is the RAW file.  Does anyone have an idea, which could send the rest of the data?  It doesn't seem to make much sense, but there are lots of channels repeated in there, is probably not the right line random noise or something.  The two stations were using the built-in COM1 port of the PC.

One of test stations I have an Agilent E3646A power connected to the station with a USB-to-serial adapter and a null modem cable.  Sometimes she page and throw up a ton of errors, which are all 'error 511', which the manual says is a framing error RS232.  I put the data on this line valve and sent a few * IDN?  orders with reset and commands activate the remote to check that it worked and concluded that some other process was sending * IDN? queries as well, they just don't have not been correctly formatted (they seem to not properly finish more have some end ASCII gibberish) for the device, so it threw errors.  I've also attached the log of this Putty session.

I tried to use the technique in this article to find which process accessed the port, but it seems that no matter what either method uses it don't leave it open long enough for me to find.

I am using Windows 7 64 bit at the time of these PCs, so that means Portmon doesn't work, and I can't find another utility that works in the same way.  Does anyone know of one?

Anyone know if there is a process OR who could send these signals?  There are only a few of them running in the background.  I have 4 other devices on the first station and 6 on the second station with their own drivers as well, so I can't exclude the software of others.

I really really to want to have to write the manuals of equipment for these stations and include phrases such as "power Cycle the device each morning to reset" or "Disconnect the serial cable when done for the night" or "ignore the power of Agilent errors."

I can guess what happens. at least with the Agilient.

you have failed to use an external hub with its own power supply and you neglected to put a serious surge protection on main power from the PC.  Pretty undesirable power pri is out to actually make windows think that the USB - serial adapter is pluged back in and some device (Agilient IO libraries?) Manager did a scan for USB TMC devices when the connection is "restored".

Simillarly the PC power supply affects the COM port.  Kiethleys are known to have reported a clear feature "DCL" when they receive malformed commands of the noise.

NEITHER track will eliminate any VISA request and confirm the electrical noise

Recommendations:

  • Get a surge / UPS on this machine to guard against junk food to the line managers from air and other large expenses cleanroom.
  • Get bundles of cables with ferrites on them for the serial data lines.

Alternate:

  • Get a membership to a hair club - you'll get a lot of hair out

Tags: NI Software

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