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Perdition
Guest
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 Posted:
Tue Nov 15, 2005 9:20 am Post subject:
difference between an rs232 female-to-female and male-to-mal |
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is there a difference between the pinouts? I can't find a site that
illustrates male-to-male and female-to-female with an explaination for
the cabling. Thanks for your time :) |
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Nico Kadel-Garcia
Guest
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| Posted:
Tue Nov 15, 2005 5:20 pm Post subject:
Re: difference between an rs232 female-to-female and male-to |
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"Perdition" <nhnmp@walla.co.il> wrote in message
news:1132043228.141785.73320@g43g2000cwa.googlegroups.com...
| Quote: | is there a difference between the pinouts? I can't find a site that
illustrates male-to-male and female-to-female with an explaination for
the cabling. Thanks for your time :)
|
It Depends(TM). The RS-232 standard, specifically RS-232c, is a 25-pin
standard with lots and lots and lots of signals that nobody in their right
mind uses. The common pin-out for DB9 connectors is. umm, how can I say
this. "circumcised", as in clipping off the bits you don't carry useful
signal and that can cause problems.
I personally find the old Yankee Electronics quite useful in describing
various pinouts, and various adapters, showing the differences between DTR
and DSR connectors. Modems, in particular, need to carry the ring-detect
signal and the hardware flow control signals, so the common pin-outs for
DB-9 are fairly odd. I don't have the better references in my bookmark list
right now, but it's worth poking around.
In particualr, a lot of modern female-female cables violate the spec by
being simple straight-through cables instead of being a null-modem cable,
which drives me nuts. |
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Aaron Leonard
Guest
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| Posted:
Wed Nov 16, 2005 1:03 am Post subject:
Re: difference between an rs232 female-to-female and male-to |
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Male vs female per se makes no difference to the pinning. What makes
a difference wrt pinning is:
- connector type used (DB25 vs. "DB9" [actually DE9]) vs. RJ45 vs ...)
- DCE vs DTE
- implementation oddities in the DTE (and, less frequently, in the DCE)
There are *conventions* for specific connector types wrt whether a DCE
is male or female. For example, with DB25 the convention is that both
the DTE and DCE are female, while with DB9 the convention is for DTE to
be male and DCE female.
Here's some good links on the subject:
http://www.arcelect.com/rs232.htm (cablish perspective)
http://www.beyondlogic.org/serial/serial.htm (PC / logic board perspective)
http://nemesis.lonestar.org/reference/telecom/modems/dtedce.html
(good table of pinouts, although be aware that the RJ45 pinouts are totally
different from Cisco's assignments)
Cheers,
Aaron
---
~ is there a difference between the pinouts? I can't find a site that
~ illustrates male-to-male and female-to-female with an explaination for
~ the cabling. Thanks for your time :) |
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Perdition
Guest
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| Posted:
Wed Nov 16, 2005 9:20 am Post subject:
Re: difference between an rs232 female-to-female and male-to |
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| thanks alot for the input nico and aaron :) |
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Nico Kadel-Garcia
Guest
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| Posted:
Thu Nov 17, 2005 7:26 am Post subject:
Re: difference between an rs232 female-to-female and male-to |
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"Perdition" <nhnmp@walla.co.il> wrote in message
news:1132120458.942447.105220@f14g2000cwb.googlegroups.com...
| Quote: | thanks alot for the input nico and aaron :)
|
No sweat. And despite the misdesign of a lot of devices, there *IS* a
standard for mail RS-232 that differs from female RS-232, so that in theory
if one device has a male connector and another has a female connector, you
just connect a straight cable between them and you can communicate both
ways. The difference is normally referred to as DTE and DCE. I found a nice
tutorial at http://www.arcelect.com/rs232.htm, which you may ennoy if you
want to see how it really works. |
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