strange cable, coms to parallell?

Posted on 2006-10-21
Last Modified: 2010-04-30
i have this strange cable connected to a
converter (coms serial 9 pin
to 25 pin parallel)

the cable is 40 metres long and carries dos commands via serial
coms port to a tool with a parallel input.

im not sure its a parallel cable is it possible this is
cat 5 wired up with 25 pin connectors??

any ideas?

Question by:usbcrazy1
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garycase earned 500 total points
ID: 17781799
It's a DB-25 to DB-9 RS-232 serial cable.   RS-232 ports originally used DB-25 connectors --> then PC serial ports started using DB-9's, and that's now much more common.

But I'm sure what you have is simply a serial cable the connects two serial devices ==> I suspect your "... tool with a parallel input" actually has a serial input :-)
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... another reason I'm sure it's a serial cable:  40 metres is WAY too long for a parallel signal [the IEEE 1284 spec states a maximum cable length of 10 metres]   :-)    (but 40 metres is fine for an RS-232 connection)
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I will second that.  

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