amigaXfer: Lightning fast serial null-modem cable file/floppy transfer aminet.net/package/comm/m…
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👤︎ u/uglygreed
📅︎ Sep 15 2021
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I think y'all will find this interesting, messed around while i was waiting for my 5pin DIN null modem cable. reddit.com/gallery/poelrn
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👤︎ u/kwimbleton
📅︎ Sep 14 2021
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Wire null modem cable to interface with Arduino program

Hi, I found this tutorial which seems like something I am interested in making but I would like to make it so that instead of sending the data over serial usb, it send it over 5v rs232 (or rs422, 485 but rs232 seems most standard) is there a way to connect up a serial port like this directly to the analog in pins or something to allow it to receive serial port data from the computer?

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👤︎ u/Skeledog99
📅︎ Apr 15 2021
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With the help of a null modem, an LPD print share, and MacTCP/MacPPP: A Mac Plus printing to a modern inkjet imgur.com/s2aLB1v
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👤︎ u/nkeck72
📅︎ Mar 20 2021
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rs232 null modem for old switch
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👤︎ u/xaxnas
📅︎ Feb 19 2021
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Why won't two computers talk to each other over a null modem connection?

I have two laptops, both running Windows 95, and one of them has a broken floppy drive so serial is the only way I can get stuff on and off it for now. If I hook up either computer to a modem, I can load hyperterminal and connect to COM1 at 9600/8/N/1 no problem. AT OK. But for whatever reason, when I put a null modem adapter on the cable and connect the two computers together, I get nothing. Any ideas?

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👤︎ u/xe3to
📅︎ Mar 19 2021
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Amiga Null Modem (amiga explorer)

I been thinking since I cannot find anything longer than 6 foot in Canada of a Null Modem female to female I was wondering if any of you have ever used two DB9/DB25 to RJ45 email connectors and run a CAT5 or 6 cable between them?

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👤︎ u/SmoothRunnings
📅︎ Mar 26 2021
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Bunch of updates to Null. SSTV? Modem noises?

I hadn't seen this posted yet but Null updated his website http://nullge.net/ with a whole lot of new content, and then did a huge live stream that seems to be modem noises and maybe SSTV? Anyone have ideas how to deal with this? https://www.youtube.com/watch?v=iq5JYdFLXi8

The website also has the videos in what I assume are the correct order now. Point is I feel like there's a lot more going on.

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👤︎ u/Quadroskye
📅︎ Apr 19 2021
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Just warming up for BBS Week 2021. I've got Lubuntu set up on an old Dell laptop and I've switched on console access via ttyS0 (COM1). Amiga A1200 as proof of concept. Looks like I've got me some more null modem cables to make!
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👤︎ u/ozretrocomp
📅︎ Jan 30 2021
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Selectable null modem cable?

Have any of you in the PLC world ever come across a DB9 serial cable with a toggle switch to swap the TX/RX lines built in to the cable? It seems like I'm always having to dig around for a null or cut up a cable in a pinch when I'm in the field and I'd like to reduce the amount of small odds and ends floating around in my laptop bag. Just curious if anybody has seen something like this.

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👤︎ u/CJ_Diesel
📅︎ Dec 19 2020
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Anyone up for a game of Age of Empires over a Serial Null Modem cable?
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👤︎ u/Taffer25
📅︎ Oct 23 2020
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After a crazy amount of time spent troubleshooting serial cables, null-modem adapters, 30-year-old 3rd-party drivers, etc., I now *finally* have my HP plotter working with my Mac Performa 575! youtu.be/hpmRMP6rKro
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👤︎ u/wowbobwow
📅︎ Nov 11 2020
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Finally got this lil' chonk online. PPP connection via a null modem cable and a thin client running SLiRP on Linux. Next step: 128 MB RAM/32-bit ROM upgrade imgur.com/aXJsdXB
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👤︎ u/bennythebaker
📅︎ Feb 11 2020
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BBSing from my Lisa 2/10 over null modem with my Raspberry Pi! (Resubmit cause first pic was screwy -- had to turn on flow control to fix it!)
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👤︎ u/IIsForInglip
📅︎ Sep 07 2019
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Finally got this lil' chonk online. PPP connection via a null modem cable and a thin client running SLiRP on Linux. Next step: 128 MB RAM/32-bit ROM upgrade imgur.com/aXJsdXB
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👤︎ u/bennythebaker
📅︎ Feb 12 2020
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For that one and only occasion in your life when you need a null-modem cable
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👤︎ u/gargravarr2112
📅︎ Apr 29 2020
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We had no null modem cable for a serial connection on a sg300 Cisco switch so we did this 👇
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👤︎ u/Snouwy
📅︎ Feb 03 2020
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Got my Apple //c connected to my new Raspberry Pi over null modem, and celebrated by joining the BBS!
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👤︎ u/IIsForInglip
📅︎ Mar 07 2019
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When you need to configure switch right now, but don't have null modem cable
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👤︎ u/rykolepl
📅︎ Jul 20 2019
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New Switch. No Null Modem Cable so I had to improvise
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👤︎ u/superdumbell
📅︎ Dec 18 2017
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The USB Null Modem Cable Is Now A Thing hackaday.com/2020/08/25/t…
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👤︎ u/hackadaybot
📅︎ Aug 25 2020
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My ST is online ! All I needed is a Rpi, tcpser an FTDI cable ,and a null modem adapter.
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👤︎ u/papa_robot
📅︎ Jun 21 2019
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Need a Null Modem but all you have is 2 Straight Through serial cables?
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👤︎ u/Duffs1597
📅︎ Sep 15 2017
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Can anyone identify this RS232 to USB adapter? I don't know if it's null modem or straight through, found it in a random box.
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👤︎ u/TheLioncraft
📅︎ May 25 2018
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Was on the job servicing Siemens ultrasonic flow meters taking a download via modbus, when I realized I forgot my null modem adapter. Has some spare braided wire laying around. Had to guess the wires. Felt so good to get it to work. imgur.com/m8Ko0QG
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👤︎ u/Insertions_Coma
📅︎ Dec 13 2016
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Finally got this lil' chonk online. PPP connection via a null modem cable and a thin client running SLiRP on Linux. Next step: 128 MB RAM/32-bit ROM upgrade imgur.com/aXJsdXB
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👤︎ u/bennythebaker
📅︎ Feb 12 2020
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Where can I get a null modem adaptor in London on a Saturday?

Repost, this time with flair.

Title pretty much covers it. After hours and hours of troubleshooting I figured out that my null modem serial cable was... well not so null modem.

After a few more hours of butchering another serial cable, attempting to make my own null modem adaptor I have been defeated. No matter how I arrange and rearrange the pin out two what should be correct, I still cannot get it to work.

Due to this, I am looking to find somewhere I will be able to buy one of these. I can see many online, however I am hoping to get one this weekend and not have to wait till Tuesday.

If only Maplins was still around...

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👤︎ u/oliver366370
📅︎ Dec 08 2018
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When you need to configure switch right now, but don't have null modem cable
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👤︎ u/rykolepl
📅︎ Jul 20 2019
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2 Amiga 500 + cavo null-modem, 30 anni dopo.
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👤︎ u/mfabbri77
📅︎ Dec 29 2018
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NC100 Null Modem to PC

https://preview.redd.it/s0di845qain31.jpg?width=2436&format=pjpg&auto=webp&s=81fb7079b4a4d18650a67d31b3066359effb5fe8

Bought this on a whim via eBay! Great condition and the wordprocessor is easy to use and more than good enough for taking notes and composing drafts on the go. Love the instand-on. Really instant on.

But I can't get the null modem connection to a PC to work. I sued the instructions here https://www.ncus.org.uk/ffeb04.htm

I used a standard 9-pin female to female null modem cable and Hyperterminal on the PC. I can get 2 PCs to send text to each other. I can also get the PC to send text to the NC100 terminal program. But I can't get text from the NC100 to the PC. This likely means I will only be able to send documents from the PC to the NC100 only.

Does anyone here have any thoughts?

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👤︎ u/teletype100
📅︎ Sep 19 2019
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We had no null modem cable for a serial connection on a sg300 Cisco switch so we did this 👇
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👤︎ u/zaynpt666
📅︎ Feb 04 2020
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Hello with BBS Telnet Server & null modem cable

For the most part my system works except I get these RS232:Error framing baud errors popping up often that wrecks havok with the BBS Telnet Server software.

Can anyone recommend settings or changes to minimize this? Or should I be using tcpser instead?

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👤︎ u/dcpanthersfan
📅︎ Feb 15 2019
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I needed a straight through cable to configure a DCE switch, but I only had a null modem cable and a null modem adapter. Seven paper clips and a zip tie later, I’m in!
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📅︎ Dec 13 2017
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Null Modem Cable imgur.com/a/0VKPA
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👤︎ u/samuellovelace
📅︎ Jan 31 2016
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Serial Null Modem

Any recommendations for connecting a Macintosh Classic/SE/Classic 2 to a PC by means of serial modem?

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👤︎ u/Ryanw84
📅︎ Oct 03 2019
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[W][US-NC] USB Null Modem Cable

Looking to see if anyone can help me out. I'm looking for a null modem cable with USB for my Dell Powerconnect switch that I recently bought. Was hoping someone had a spare laying around or one not being used.

I can pay with just about any preferred method. Paypal, Crypto, whatever else.

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👤︎ u/megawatz
📅︎ Jul 20 2019
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Topaz signature capture pad connected to PC via serial cable. Would this cable need to be a straight-through or a crossover (null modem) cable?

Older tech at work, serial only connection, need to replace cable with longer one but can find no info about the sig pad being a dce or dte device. It has a female connector, which in strict RS232 standards should indicate dce but this is not a closely followed rule so connector type could be meaningless. I know I could test the voltage at the pins to determine this, but breaking out a meter at work will immediately raise the boomer threat level to DEFCON 2. I have a straight-through cable with a null modem converter availabe but I'd prefer not to trial-and-error it (again, due to boomer panic concerns) if there is someone who can tell me if these devices are considered dte to dte or dte (PC) to dce (pad). Surely we're not the only business out there still using these serial only topaz pads.

Help me if you can, plox!

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👤︎ u/v_grimm
📅︎ Dec 21 2019
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Which null-modem cable?

I've bought a 'old' Dell PowerConnect 3524 switch which I have to configure using a serial management port.

I have a USB-RS232 adapter and a friend is sending me a rollover cable (rs232-rj45) and I have a rs232 breakout box. But which pinlayout should I 'make' or use for this switch?

According to the wiki there are 4 types:
https://en.wikipedia.org/wiki/Null_modem

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👤︎ u/reditdat
📅︎ Feb 06 2019
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Needed a null modem cable imgur.com/a/1cbpK
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👤︎ u/Archon-
📅︎ Nov 18 2013
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Null modem cable for Dell Powerconnect 5424

Can anyone clarify for me the cable I would need to setup this switch? I know the switch connection is male, and the cable connected there is female. But I dont have a serial connection on my computer, so I would have to use USB. Does a cable that is USB to null modem do the trick? Then just use putty to log on? I ask because I am seeing several different kinds. It specifically says crossover, so if I buy a usb to serial null modem cable, will it be the correct cable? Or do I need to make sure of more details?

Any help would be greatly appreciated.

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👤︎ u/miketurzo
📅︎ Mar 25 2018
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Needed null-modem, only had a straight. Jumper cables to the rescue. Worked great.
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👤︎ u/nullr0uter
📅︎ May 02 2019
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Homemade Null modem help - Pinout is confusing
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📅︎ May 25 2017
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USB-Serial check, null modem cable...nope
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👤︎ u/libertysyclone
📅︎ May 04 2017
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DIY Null Modem Cable (with hardware flow control pins) from old HP Console cables

Hi guys,

Recently found myself in a ridiculous position where I needed a null modem cable with flow control to flash a BIOS update onto a Watchguard, and realised we had none in stock and waiting for one to be ordered and delivered was wasting time I didn't have so I turned a couple of old HP console cables into a DIY null modem cable - I've posted it on my blog here: http://fueledbymocha.co.uk/diy-null-modem-cable-with-hardware-flow-control but if mods prefer, I can transfer the contents into this post.

Thought it might be handy for someone at some point, if anything it gives you a reliable pinout for the HP console cables :)

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👤︎ u/faintaxis
📅︎ Feb 08 2017
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