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Old 03-30-2009, 03:40 PM   #1
gratney
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Device monitoring for input / output


Hello,
I'm wondering if anyone may have a recommendation for monitoring I/O of a particular device. I have a hardware device meant to emulate what is called Link-16 messages over a 1553 bus (this is a coax bus). We were delivered a custom driver, but the vendor offers little support. The driver loads into the kernel, but the device is not having proper communications with a connected device. I'm looking for an idea to verify the card is sending out messages (i.e. Wireshark for a non-network device). If anyone has any good suggestions please let me know.
Thanks.
 
Old 04-01-2009, 09:42 AM   #2
TB0ne
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Quote:
Originally Posted by gratney View Post
Hello,
I'm wondering if anyone may have a recommendation for monitoring I/O of a particular device. I have a hardware device meant to emulate what is called Link-16 messages over a 1553 bus (this is a coax bus). We were delivered a custom driver, but the vendor offers little support. The driver loads into the kernel, but the device is not having proper communications with a connected device. I'm looking for an idea to verify the card is sending out messages (i.e. Wireshark for a non-network device). If anyone has any good suggestions please let me know.
Thanks.
From what I remember, the 1553 is a serial link. If there's some way you could break out the coax to a 'regular' serial port, you could look at the traffic.

Maybe take the transmit from the coax, and put it into the receive on a serial port. Run minicom, and you should see all the data flowing from the device to the other device..you're not interrupting the signal, just tapping it. But the 1553 is milspec, so I don't know how the impedance drop might affect the signal, but it should be negligible.

You could always do the same thing, but take receive from the coax, to receive on another serial port, and run minicom in another window, so you could see traffic both ways. Minicom will let you do a capture of screens/data to a file....
 
Old 04-03-2009, 03:05 PM   #3
gratney
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Thanks TB0ne,
That's a good idea. I have feelers out to try and borrow an inline protocol analyzer. If I don't get any contacts back soon though, this is a good way ahead. I'll just have to build a breakout connector. Time for a trip to Radio Shack
Thanks!
 
Old 04-03-2009, 03:39 PM   #4
TB0ne
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Quote:
Originally Posted by gratney View Post
Thanks TB0ne,
That's a good idea. I have feelers out to try and borrow an inline protocol analyzer. If I don't get any contacts back soon though, this is a good way ahead. I'll just have to build a breakout connector. Time for a trip to Radio Shack
Thanks!
No problem...old-timers like me remember serial lines being the ONLY way to communicate....unless you got one of those fancy parallel-port input drivers.
 
  


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