-
25 Pin Laplink Cable
I have just completed making my own rs-232 laplink cable.
(handy for backups and laplink software)
Below are the pinouts for the same.
25 PIN D-SUB MALE to Computer 1.
25 PIN D-SUB MALE to Computer 2.
Name Pin Pin Name
Data Bit 0 2 15 Error
Data Bit 1 3 13 Select
Data Bit 2 4 12 Paper Out
Data Bit 3 5 10 Acknowledge
Data Bit 4 6 11 Busy
Acknowledge 10 5 Data Bit 3
Busy 11 6 Data Bit 4
Paper Out 12 4 Data Bit 2
Select 13 3 Data Bit 1
Error 15 2 Data Bit 0
Reset 16 16 Reset
Select 17 17 Select
Signal Ground 25 25 Signal Ground
Pretty easy to create this from 2 old printer cables etc.
Enjoy.
I appologise for the formatting.
I formatted it perfectly but the forum message board seems to have re formated it for me.
Appologies. I will put it in a word file. E-mail me if you can't make sense of the above.
-
Re: 25 Pin Laplink Cable
Quote:
Originally posted here by mark_boyle2002
Pretty easy to create this from 2 old printer cables etc.
Aren't these female?
-
No
Think about it they go in the same connector at the back of the p.c don't they.
P.S coming soon the 9 pin version.
-
Re: 25 Pin Laplink Cable
Quote:
Originally posted here by mark_boyle2002
I have just completed making my own rs-232 laplink cable.
<.......snip....>
Pretty easy to create this from 2 old printer cables etc.
I hate to break this to ya, but these 2 connectors are definitely different.
A printer (parallel) cable has a 25 pin sub-d male connector.
A serial cable has a 25 pin sub-d female connector.
This is to prevent ppl from plugging the wrong cable in the wrong port.
These days most (all?) serial ports use a 9 pin port.
edit: Looking at the pinout I see you mean the 25 pin parallel port. I got thrown off by the rs-232 at the top. RS-232 is serial.
-
Doh,
I know I put rs-232 but I couldn't edit this out later.
-
Humm most of my machines have 25 pin serial on them (then again I built most of them myself). and with the right tools (genderchangers) you could do this with a printer cable.
Mark could have also been talking about the ungodly slow laplink over paralle connection :)
You can also get littel boxes that change the pinout of a cable and create a crossover from a regular cable, these run prety cheap but I have forgoten the name. Most cableing catalogs will have them
-
in a 25 way you can get away with just wiring 2, 3 & 7 and in 9 way you can just wire 2, 3 & 5.
(txd, rxd & gnd and rxd, txd and gnd)
this can get you out of a hole if you are in a rush and cant be arsed to wire the whole lot using serial cable.
its particularly useful if you have any 25 or 9 way to rj-45 connectors lying around as you can just do it using these and cat5e patch leads.
bit of a bodge, but a quick fix that has helped me out from time to time.
-
Quote:
Originally posted here by atomiser
in a 25 way you can get away with just wiring 2, 3 & 7 and in 9 way you can just wire 2, 3 & 5.
(txd, rxd & gnd and rxd, txd and gnd)
Yep. Just a simple null-modem cable with no hardware handshake. If you connect 4&5 (rts,cts on a 25 pin con.) to 5&4 on the other end you can also use hardware (rts/cts) handshaking.
Quote:
Originally posted here by bballad
You can also get littel boxes that change the pinout of a cable and create a crossover from a regular cable, these run prety cheap but I have forgoten the name. Most cableing catalogs will have them
This is called a breakout box ;)
-
9 to 25 pin null modem
D-Sub 9 D-Sub 25
Recieve Data 2 2 Transmit Data
Transmit Data 3 3 Recieve Data
Data Terminal Ready 4 6+8 Data Set Ready + Carrier Detect
System Ground 5 7 System Ground
Data Set Ready + Carrier Detect 6+1 20 Data Terminal Ready
Request to Send 7 5 Clear to Send
Clear to Send 8 4 Request to Send
