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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?

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Old 12-23-2007, 10:06 PM   #1
lothario
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Null vs Straight Data Cable


I have a few older serial cables.
M to F
M to M
F to F


How can you tell if a serial cable is:
a Null Data Cable
OR
a Straight Data Cable

I don't have access to any kind of testing equipment.
 
Old 12-23-2007, 10:21 PM   #2
Simon Bridge
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null cables normally have "null" written on it. Are these rs232 cables?
 
Old 12-23-2007, 10:29 PM   #3
lothario
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These are 9-pin cables.
There is nothing written on these cables.
They look very similar.
But they are Null or Straight.
I was told these were used for programming serial devices.
 
Old 12-23-2007, 10:53 PM   #4
Simon Bridge
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Serial cables - they are most likely straight.
A null serial cable for rs232 is like a crossover cable for cat5.
For the same reason, they are clearly labeled.

Of course, you can test it out with a modem - you cannot access a modem with a null cable.
 
  


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