I have an application requiring a 9-pin male to 9-pin male null modem adapter. Pinouts PLEASE!!!!!!!!!!

Gary Stanton

SBV Automation cc
PORT ELIZABETH
Tel/Fax:- +27 41 3608205
Cell:- 083 222 9546

 

Hi Gary,
you can find number of informations on serial, USB and parrallel ports, at the following address.
http://www.beyondlogic.org/
Here is Null modem wiring diagram I have found on this site.
http://www.beyondlogic.org/serial/serial.htm#4

Jeff Portala
SoViLor company
[email protected]

 

Easy!

2---\ /---2
\/
/\
3---/ \---3

5----------5

 

Hello.

I found a similar cable (9p-9p female), and a lot more pinouts at the Hardware Book:

http://www.hardwarebook.net/

The 9P-9P Null Modem Cable is described here:
http://www.hardwarebook.net/ca_Nullmodem9to9.html

The pinout for the male-male version should be very similar (if not the same), but at least this will get you started.

Greetings,

Alexis Maldonado
EE Student
University of Costa Rica

 

3---------------------------------2
2----------------------------------3
7-----------------------------------7

Cheers and Good Luck


Allan Chinchilla

 

Just buy one at your local Radio Shack for a couple dollars.

Bill

 

www.pin-outs.com


Jay Kirsch
Macro Automatics
2985 E. Hillcrest Drive, Ste 101
Thousand Oaks, CA 91362
[email protected]

 

9-pin NULL modem:

1,6 - 4
2 - 3
3 - 2
4 - 1,6
5 - 5
7 - 8
8 - 7

pin 1 and 6 should be connected together at each end and then connected to pin 4, this means you need 8 wires for the cable.

It might be enough to use a simplified version where only pin 2,3 and 5 are used, wired as above.


/Johan Bengtsson


----------------------------------------
P&L, Innovation in training
Box 252, S-281 23 H{ssleholm SWEDEN
Tel: +46 451 49 460, Fax: +46 451 89 833
E-mail: [email protected]
Internet: http://www.pol.se/
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Be aware that there are MANY types of "null-modem" cables. The TX and RX are always crossed, but some cross DTR and DSR, others short them together, or pull them high (actually low: -12v is a logic ONE), and so on. If you use a
"standard" one, it may work or it may not, depending on how the software at each end use the handshaking signals like DTR/DSR, RTS/CTS, etc.

Lloyd Sumpter
LSumpterConsulting

 

DB9 DB25 PIN PIN DB25 DB9
3 2 TX ------------------ RX 3 2
2 3 RX ------------------ TX 2 3
8 5 CTS ------------------ RTS 4 7
7 4 RTS ------------------ CTS 5 8
6 6 DSR ----------------+- CD 8 1
4 20 DTR -+ +- DTR 20 4
1 8 CD -+---------------- DSR 6 6
5 7 GND ------------------ GND 7 5
- 1 CHG ------------------ CHG 1 -

Good Luck !!

--
Hevelton Araujo Junior
Ger=EAncia de Engenharia
Tel.: +55-31-34275852
Fax.: +55-31-34912077
[email protected]