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Connector and cable for analog controlboard
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Offline einotuominen  
#1 Posted : 13 May 2023 12:01:16(UTC)
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einotuominen

Finland   
Joined: 19/09/2022(UTC)
Posts: 382
Location: Kaarina
Hi,

I was wondering if anyone has used the DB25 SCSI cable to connect control panel to layout? Can it take the currents common to MRR, more specificly Z scale currents and voltages?

I’m also considering 24 pin ATX, but it looks more cumbersome.

BR,

-Eino
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Offline marklinist5999  
#2 Posted : 13 May 2023 12:34:12(UTC)
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marklinist5999

United States   
Joined: 10/02/2021(UTC)
Posts: 3,117
Location: Michigan, Troy
You can use anything well insulated. Only rule is the longer the cabling, the thicker it should be. Scale uses only 8 volts so the gauge can be about 24.
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Offline Toosmall  
#3 Posted : 13 May 2023 13:04:00(UTC)
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Toosmall

Australia   
Joined: 26/07/2021(UTC)
Posts: 614
Location: Sydney
I'm using SCSI for signals & points, using 2 wires for each circuit & from memory about 4 for a common negative. But using a 36pin plug (about 46 x 21mm) for all the power to the rail circuits.

default_84.jpg

I have made all the switch/wire the same so if one fails it is easy to swap, it was easier to make them all up in bulk at the desk then plug them in. Have a few spares. Same with the 2 circuit boards, easier to make the wiring at the desk. Relays plug into seats so can be swapped.

60017.jpg
(36pin plug at left of photo, 4 SCSI 50pin plugs behind wiring (3 used, 1 spare for another module))

DSC_0667_114605.jpg

DSC_0668_114603.jpg

DSC_0669_114559.jpg

I have done all the difficult wiring, but still need to finish things off.
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thanks 3 users liked this useful post by Toosmall
Offline kiwiAlan  
#4 Posted : 13 May 2023 15:54:55(UTC)
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kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 8,101
Location: ENGLAND, Didcot
Originally Posted by: einotuominen Go to Quoted Post
Hi,

I was wondering if anyone has used the DB25 SCSI cable to connect control panel to layout?


One layout at the club I go to used DB25 serial cables to connect between modules. They cut the cable to connect to tagstrips to distribute the connections around the module, but found they ha to be careful as no two cables had the same colour code for pin connections, so when the cut the cable they had to make sure the other half of the same cable was used as the mating connector.
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Offline einotuominen  
#5 Posted : 13 May 2023 16:31:28(UTC)
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einotuominen

Finland   
Joined: 19/09/2022(UTC)
Posts: 382
Location: Kaarina
Maybe I’ll try DB25 serial cable. It would be much cleaner installation than ATX.

Though I guess I could make my own cable inside a shrinktube using 24 gauge wires if I can find DB25 males with solder pads. I did find the females.
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Offline bph  
#6 Posted : 13 May 2023 22:27:49(UTC)
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bph

Norway   
Joined: 04/08/2018(UTC)
Posts: 994
+1 for the DB 25 serial cable

try e.g. the fi.rsdelivers.com or mouser.com
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thanks 1 user liked this useful post by bph
Offline einotuominen  
#7 Posted : 14 May 2023 06:24:53(UTC)
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einotuominen

Finland   
Joined: 19/09/2022(UTC)
Posts: 382
Location: Kaarina
Originally Posted by: bph Go to Quoted Post
+1 for the DB 25 serial cable

try e.g. the fi.rsdelivers.com or mouser.com


Thanks bph! I actually have four of these https://www.triopak.fi/fi/tuote/DB25SS so I only need the cables, which are the ones that matter.

This product seems to have AWG 24 https://www.mouser.fi/Pr...pq341KU5fIlpHPKNhQ%3D%3D

These are the connections I need and I'm planning on having just one pin/wire for each. Otherwise 2x25 will not be enough:

Screenshot 2023-05-14 at 7.04.40.png

Amp rating is 2 amps for the above cable so I guess that's more than enough for Z scale currents.

EDIT:
Found this great product: eBay DB25 pcb terminals

BR,
Eino
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Offline Toosmall  
#8 Posted : 14 May 2023 07:48:59(UTC)
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Toosmall

Australia   
Joined: 26/07/2021(UTC)
Posts: 614
Location: Sydney
They are painful to solder SCSI plugs due to tight spacing, so I would set up on the desk, mount the plug on something temporary at the best angle so it doesn't move to solder on all the wires, long enough. Then run the wires to a user friendly terminal block.

It might sound like extra work, but you will spend less time fluffing around in difficult situations.

You want to keep the soldering iron on the joint as shorter time as possible not to over heat the SCSI plug.

A can of freeze spray at the ready is handy (also good for killing ticks!)
https://www.jaycar.com.a...ezing-spray-can/p/NA1000
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