record and replay data from a serial device.

Posted on 2006-05-10
Last Modified: 2013-12-27
I have a device that uses a db9 cable to transmit data from one device to the other (like a brain and a removeable keypad). what I want to do it use some kind of software or hardware to put inline between the two devices to record the data strem and play it back or at least "see" the traffic between the two devices. is this possible?
Question by:warnerangle
    LVL 31

    Expert Comment

    If you have a PC with a serial port, the problem boils down to branching off the signal(s) and running a suitable software on the PC that can capture serial port traffic.

    One possibility, used in some instances, is to replace the keypad with a PC running a terminal emulator. I've been working with this setup on some very old and expensive pieces of lab equipment that originally had a sort of keyboard attached. Once the KB broke down/burned/was drowned/whatever and needed replacement, the instrument model was, of course, obsolete and spare parts prohibitively expensive. The solution proved to be to use an old(-ish) PC with a terminal program instead of the KB. This allowed for "recording" of the sessions as well.


    Author Comment

    I guess that is my problem, I dont know much about the device. how do I find out what pins are used for data transfer? can I use a volt meter or something like that? or do you know of something that can find out. I cant find any information about this anyware. not even from the maker.
    LVL 31

    Accepted Solution

    This site might help, if the connection is anything along "normal" setup principles. Otherwise I think you may have to look at each lead in the cable and measure against ground/chassis with an oscilloscope.

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