Null cable pin-out

[Livewire]

I need a null cable for direct connect and don't want to go out and buy one. I can't find any info about the pin-out is it a complete reversal 1-25 2-24 ..ect.? It can't be that simple can it? Thanks, I probably Should have posted in Networking. But, I was hoping I could do it today.
Livewive

[Eli]

I had a site in my favorites with the pinouts on it, but it has closed down. I can tell you that if you have access to a DOS 6.x based system, the pinout is in the help program, under interlnk. Hope this helps...

[Livewire]

Thanks Eli,
In fact i think I do somewhere I think I actually Have an original Copy of a DOS 6.x disk somewhere thanks again
Livewire

[LazMan]

Did you get the information you were looking for? If not, for you and everyone else - here is the specifics for making a Null Modem Serial Connection:

The wiring specifications for serial nterLink cables that can be used with Direct Cable Connection. To make a serial InterLink cable, make a serial cable with either a 9-pin or 25-pin female connector on both ends, and wire the cable as follows:

9-pin 25-pin 25-pin 9-pin Description
----------------------------------------------------------------------
pin 5 pin 7 <------> pin 7 pin 5 Ground-Ground
pin 3 pin 2 <------> pin 3 pin 2 Xmit-Rcv
pin 7 pin 4 <------> pin 5 pin 8 RTS-CTS
pin 1 and 6 pin 6 <------> pin 20 pin 4 DSR-DTR
pin 2 pin 3 <------> pin 2 pin 3 Xmit-Rcv
pin 8 pin 5 <------> pin 4 pin 7 CTS-RTS
pin 4 pin 20 <------> pin 6 pin 1 and 6 DTR-DSR

The Ground (GRD) line is the reference signal ground for all other lines. The Transmit Data (TD) line is used for sending data. The Receive Data (RD) line is used for receiving data. The RTS (Request To Send) line is used by the data terminal equipment (DTE) to indicate that it is ready to send data. The CTS (Clear To Send) line is used by the data communications equipment (DCE) to indicate that it is ready to receive data. The DSR (Data Set Ready) line is used by the DCE to indicate that it is ready to comunicate. The DTR (Data Terminal Ready) line is used by the DTE to indicate that the DCE should initiate communication.

Should you want to make a parallel InterLink cable, make a parallel cable with male DB-25 connectors at both ends, and wire the cable as follows:

25-pin 25-pin
------ ------
pin 2 <------> pin 15
pin 3 <------> pin 13
pin 4 <------> pin 12
pin 5 <------> pin 10
pin 6 <------> pin 11
pin 15 <------> pin 2
pin 13 <------> pin 3
pin 12 <------> pin 4
pin 10 <------> pin 5
pin 11 <------> pin 6
pin 25 <------> pin 25 Ground-Ground

Hope this is useful! /forum/smile.gif

Laz