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    serial pins needed

    Aside from rxd, txd and gnd does the temp08 need rts/cts (or any other pins) to operate. I am using just tx, rx and gnd (pins 2,3,5) as well as the db9 shell ground. The two ends of the serial cable go to open house enclosure / punchdown and on ocassion I will get junk displaying in Hyperterm. Hyperterm is configured at 9600 8n1.
    Last edited by rmorton27; March 26, 2010, 10:42 PM.
    -Rick

    #2
    Originally posted by rmorton27 View Post
    Aside from rxd, txd and gnd does the temp08 need rts/cts (or any other pins) to operate. I am using just tx, rx and gnd (pins 2,3,5) as well as the db9 shell ground. The two ends of the serial cable go to open house enclosure / punchdown and on ocassion I will get junk displaying in Hyperterm. Hyperterm is configured at 9600 8n1.
    Only TXD, RXD and GND pins are used with TEMP08.

    Make sure Hyperterm is configured for no hand-shaking (Flow Control=None) so that it ignores any other connections on the DB-9.

    Mitch
    http://www.midondesign.com

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      #3
      Thanks,

      Thanks for confirmation; those were/are my settings. Anyway I found I had an old Ethernet/serial gizmo in my old junk box which actually works out better for the location and my use so all is well whatever the real issues is/was with my cabling/setup.

      No need to answer but out of curiosity can a ground loop like the type that induces hum in audio equipment contributes to the junk data (they were all the same funny characters) that I would see from time-to-time when I was running on the serial cable? They would always follow the valid data streaming from the temp08 and would start and stop as if by magic.

      -rick
      -Rick

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        #4
        Originally posted by rmorton27 View Post
        Thanks,
        No need to answer but out of curiosity can a ground loop like the type that induces hum in audio equipment contributes to the junk data (they were all the same funny characters) that I would see from time-to-time when I was running on the serial cable? They would always follow the valid data streaming from the temp08 and would start and stop as if by magic.

        -rick
        It's certainly possible. Eliminate any ground loop by using an isolated power source, such as a wall-wart, for TEMP08.
        http://www.midondesign.com

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