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Forum Index : Microcontroller and PC projects : Cable shielding

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PeterB
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Joined: 05/02/2015
Location: Australia
Posts: 458
Posted: 10:34pm 23 Mar 2020
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Good morning Paul et al

My problems with the RS232 system are:
1. It is not a balanced system and is just a cheap way of getting unimportant data a short distance e.g. a mouse.
2. The early PCs installed the RS232 driver in a socket because they had to be replaced frequently. Any attempt to use RS232 for something "interesting" resulted in Grogster smoke. I had a bloke looking quite sick when he thought he had destroyed one of our AT? PCs.

Fortunately there are much better systems available that work very well.

Peter
 
Tinine
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Joined: 30/03/2016
Location: United Kingdom
Posts: 356
Posted: 08:17pm 24 Mar 2020
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USB ain't balanced either.

I much prefer RS232 for the industrial environment because I get a D-sub connector with screw or clip retainers.

This is what I have to do with USB or it wouldn't last 5mins:



 
PeterB
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Joined: 05/02/2015
Location: Australia
Posts: 458
Posted: 01:37am 25 Mar 2020
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G'Day Tinine

I must remind you that you are talking to an Australian so please use correct English. "USB ain't balanced" indeed.
3 points, I thought USB with D+ and D- was balanced. I never said nuthin about USB. & RS484 etc can use a D type connector. So there

I like your housing. Can you provide more info please (using correct English of course).

Peter
 
Turbo46
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Joined: 24/12/2017
Location: Australia
Posts: 359
Posted: 02:13am 25 Mar 2020
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USB uses a differential pair (D+ and D-) over a twisted pair, if that's not balanced, what is? Please explain.

Bill
Keep safe. Live long and prosper.
 
Paul_L
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Joined: 03/03/2016
Location: United States
Posts: 563
Posted: 03:14am 25 Mar 2020
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PeterB & Tinine --> Geeze Louise, watsamata wid youse guys! You don't know nuttin about English? Take if from a Noo Yawker and fugeddaboudit!

Paul in NY
Edited 2020-03-25 13:18 by Paul_L
 
PeterB
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Joined: 05/02/2015
Location: Australia
Posts: 458
Posted: 03:44am 25 Mar 2020
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Paul

I put your elegant prose into Google's translator and it came straight back. Is it in some form of primitive Polish?
A second thought. Is OA47 hiding under the bed and muttering "I have created a monster".

Peter
 
OA47

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Joined: 11/04/2012
Location: Australia
Posts: 662
Posted: 08:30am 25 Mar 2020
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Been interesting seeing where this post has been going and the discussion it has provoked. I did mount the transceiver on the yagi although the bracket I intended to use was unsuitable for the mounting position ( I will modify it so I wont be relying on the cable tie)




I will monitor the records over the next week and see if I have cured the problem.

OA47
 
Tinine
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Joined: 30/03/2016
Location: United Kingdom
Posts: 356
Posted: 11:55am 25 Mar 2020
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  PeterB said  G'Day Tinine

I must remind you that you are talking to an Australian so please use correct English. "USB ain't balanced" indeed.
3 points, I thought USB with D+ and D- was balanced. I never said nuthin about USB. & RS484 etc can use a D type connector. So there

I like your housing. Can you provide more info please (using correct English of course).

Peter


Ah, I'm bi-lingual but only English and American...need to study Oz lingo  

Enclosure:
The front-end for my control system is an Android tablet.

There are plenty of rugged tablets out there but they all have the hokey USB connector which is the first thing to fail.

I carve my enclosures out of solid aluminium/aluminum   and fit them with a panel-mount Neutrik USB connector.
The connector is only for power, no data.





The end result feels/looks like it was built for the military.
My controls end up in pretty rough/grimy environments. The most common failure, in my industry is the HMI and downtime is not an option.

I have clients who have had to wait weeks for a replacement panel PC from Siemens or Beckhoff.

My HMI is a simple download exercise followed by a Bluetooth pairing and the machine is back in production.

However, it's been 8 years with installations all over the place and zero reported failures.

As it happens, I'm in the middle of another installation in Oz. The client connects the hardware and I take care of debug, setup/calibration, usually from my bed, here in the UK.

Android devices are the ultimate HMI!










 
PeterB
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Joined: 05/02/2015
Location: Australia
Posts: 458
Posted: 10:57pm 25 Mar 2020
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Tinine

Thanks for that. It is not a $5 off the shelf item but it looks good.
You really are fair dinkum.
The correct expression would be "usb aint f***ing balanced"
Do try to get it right.

Peter
 
Tinine
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Joined: 30/03/2016
Location: United Kingdom
Posts: 356
Posted: 07:11am 26 Mar 2020
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  PeterB said  Tinine

Thanks for that. It is not a $5 off the shelf item but it looks good.
You really are fair dinkum.
The correct expression would be "usb aint f***ing balanced"
Do try to get it right.

Peter


Afraid I could never do that. Not using apostrophes, for me, is right up there with "should of" instead of "should have".


 
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