Computing > General Computing

RS-232 - still alive and well

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nctnico:

--- Quote from: PKTKS on August 03, 2021, 10:29:21 am ---
--- Quote from: nctnico on August 03, 2021, 10:10:43 am ---RS232 is ground referenced just like USB so that doesn't make any difference. RS232 is also relatively slow compared to USB.

--- End quote ---

They are quite different...

RS232 has no HUB and when made for "industry grade" device attach...
they are safer.

--- End quote ---
Doesn't matter. Besides that equipment should be grounded through the mains ground or an external ground strap bolted onto the device. Not through a detachable interface whether it is RS232 or USB.

PKTKS:

I do not ground my instruments (EARTH ground).

ALL MY BENCH IS ISOLATED USING DEDICATED TRAFOS.

That includes my computer bench (workstations and NAS)

One thing is connect 2 devices  - PC and instrument - via RS232.

Another thing .. is connecting a plethora of small USB gizmos and HUBs..
and each using a different set of interfaces and power requirements..

Having USB on my bench is a nightmare.. 
I have crafted an ISOLATED HUB just to host these most important ones...

Still I am not ok when putting them.. even being ISOLATED (isolated powered HUB)
They put a COMMON GROUND among devices..

Hard to predict safely

Paul

DiTBho:
The perfect isolated UART is ... IrDA, or the optical link used in some multimeters.

PKTKS:

--- Quote from: DiTBho on August 03, 2021, 01:31:30 pm ---The perfect isolated UART is ... IrDA, or the optical link used in some multimeters.

--- End quote ---

Fro DMMs is ok  when they have both usually I got them both

For my Uni_Ts :
UNIT-UT-D02 RS232
UNIT-UT-D04 USB


But USB SCOPES gizmos and func.gens and other stuff ...
hardly will have opto isolated ready cables..

My BENCH IS FULLY ISOLATED SETUP - nothing connects EARTH.

EARTH connection was banned decades ago

DMMs are floating devices.. but grounding USB gizmos adhoc is a hazard

Paul

DiTBho:
and what about Ethernet connection with isolated transformers?
RIGOL sells DSO and function generators with Ethernet. Not expensive, and it offers good bandwidth.

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