Null-Modem cable

spannernick · 30 August 2004, 11:54

What dose a Null-Modem cable look like,i am asking because i have a external modem and the cable for it has 3 connections on it..?

one for the serial for the PC and two parallel port connectors,one male and one female...?

Galaxy · 30 August 2004, 12:25

A null modem cable does not look any different to a serial cable - the difference is in the wiring, in a null modem cable a couple of wires are crossed (similar idea to a crossover network cable).

Older PCs have serial ports in two sizes, the 9 pin ports and the larger 25 pin connectors (like the one on the Amiga - the same size as the parallel port). The cable you have sounds like a standard serial cable for a modem that allows you to connect the modem to whatever serial port your PC has - it's not a null modem cable. Other modems came with an adapter that converted the larger serial port to the smaller one.

spannernick · 05 September 2004, 21:48

Is it possable to make one...?
If so any sites about it...

spannernick · 05 September 2004, 22:18

Is this the right diagram of it...?

Galaxy · 05 September 2004, 22:57

Yes, you can make it yourself but I'm not sure whether your diagram is correct.

Here are the instructions that are on Aminet: http://aminet.back2roots.org/pub/ami...erialCable.lha , but note that they are for a DB25-DB25 cable.

manicx · 06 September 2004, 10:04

I have a PC2Amiga linkup cable and software. It connects the parallel port of PC and Amiga. Does anyone know what kind of cable is the one I am referring to and if anyone knows where I can find the diagram to make one myself?

Bloodwych · 06 September 2004, 10:49

Manicx - it uses a PC laplink cable, normally used for connecting laptops to PCs. If I remember rightly you can also use another custom made cable.

All the info (plus diagram) is in the actual PC2Am308.lha package from Aminet.

manicx · 06 September 2004, 13:07

Ta...

30 August 2004, 11:54	#1
spannernick Retro Nuts Join Date: Aug 2004 Location: London/UK Age: 53 Posts: 1,184	Null-Modem cable What dose a Null-Modem cable look like,i am asking because i have a external modem and the cable for it has 3 connections on it..? one for the serial for the PC and two parallel port connectors,one male and one female...?

30 August 2004, 12:25	#2
Galaxy Registered User Join Date: May 2004 Location: Canberra, Australia Age: 46 Posts: 1,417	A null modem cable does not look any different to a serial cable - the difference is in the wiring, in a null modem cable a couple of wires are crossed (similar idea to a crossover network cable). Older PCs have serial ports in two sizes, the 9 pin ports and the larger 25 pin connectors (like the one on the Amiga - the same size as the parallel port). The cable you have sounds like a standard serial cable for a modem that allows you to connect the modem to whatever serial port your PC has - it's not a null modem cable. Other modems came with an adapter that converted the larger serial port to the smaller one. Last edited by Galaxy; 05 September 2004 at 22:58.

05 September 2004, 22:18	#4
spannernick Retro Nuts Join Date: Aug 2004 Location: London/UK Age: 53 Posts: 1,184	Is this the right diagram of it...? Last edited by spannernick; 13 November 2023 at 00:51.

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05 September 2004, 21:48	#3
spannernick Retro Nuts Join Date: Aug 2004 Location: London/UK Age: 53 Posts: 1,184	Is it possable to make one...? If so any sites about it...

05 September 2004, 22:57	#5
Galaxy Registered User Join Date: May 2004 Location: Canberra, Australia Age: 46 Posts: 1,417	Yes, you can make it yourself but I'm not sure whether your diagram is correct. Here are the instructions that are on Aminet: http://aminet.back2roots.org/pub/ami...erialCable.lha , but note that they are for a DB25-DB25 cable.

06 September 2004, 10:04	#6
manicx Junior Member Join Date: Oct 2002 Location: Athens, Greece Posts: 991	I have a PC2Amiga linkup cable and software. It connects the parallel port of PC and Amiga. Does anyone know what kind of cable is the one I am referring to and if anyone knows where I can find the diagram to make one myself?

06 September 2004, 10:49	#7
Bloodwych Moderator Join Date: Jun 2001 Location: I'm behind you! Posts: 3,763	Manicx - it uses a PC laplink cable, normally used for connecting laptops to PCs. If I remember rightly you can also use another custom made cable. All the info (plus diagram) is in the actual PC2Am308.lha package from Aminet.

06 September 2004, 13:07	#8
manicx Junior Member Join Date: Oct 2002 Location: Athens, Greece Posts: 991	Ta...

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