I need a usb3 to rs232 adapter that WORKS RIGHT

On 8/11/19 10:20 AM, Paul wrote:
Carlos E.R. wrote:

Notice that an USB cable (usually?) doesn't have a proper ground. Should
be the metal outside part of the connector, but...Â* And then the
converter should pass this ground to the serial cable shield.

The voltages the converter can produce on the rs232 side are another
issue. ±12 should be good.


The USB cable has a ground.

And as a result, you have to think about potential issues
that go with grounded situations.

Â*Â* Paul

That model adapter I picked out has an optical isolation
model. But, the customer never had any grounding issues
with his other computers before they got moved or died.

Hmmmmmm. If it optically isolated, how does the RS232
side get power from the USB side?

On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D


Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

T wrote:
On 8/11/19 10:20 AM, Paul wrote:
Carlos E.R. wrote:

Notice that an USB cable (usually?) doesn't have a proper ground. Should
be the metal outside part of the connector, but... And then the
converter should pass this ground to the serial cable shield.

The voltages the converter can produce on the rs232 side are another
issue. ±12 should be good.


The USB cable has a ground.

And as a result, you have to think about potential issues
that go with grounded situations.

Paul

That model adapter I picked out has an optical isolation
model. But, the customer never had any grounding issues
with his other computers before they got moved or died.

Hmmmmmm. If it optically isolated, how does the RS232
side get power from the USB side?


There are ways. It can get power from the destination.

"Get power out of PC RS-232 port
Tomi Engdahl 1997-2000"

http://www.epanorama.net/circuits/rspower.html

On an opto...
VCCdest ---+
| +-- RS232-status
R derived power
|
Input ----+ +--- recovered signal
| |
LED phototransistor
| | +-- RS232-status
GND -----+ | | derived power
GND2 ---+

There is an insulating barrier between the LED side
and the phototransistor side. The phototransistor
side decides its own fate.

You *could* pass power from one side to the other,
but it must be done with a transformer, in the form
of AC power. So if you decide you need more power
than the "gimmick way", you use a switcher on the left-hand
(+5V) side and pass a high frequency power signal
through a transformer. And the transformer has
to have the same kind of withstanding as the
isolation on the optoisolator.

This is a boring enough topic, that we were, in effect,
contracting ours out. The amount of engineering (from
a "gathering the specs" point of view) is such, it isn't worth
it to do your own.

What you do want to know though, is how much power they
need to make a scheme work, and what baud rate the
poor thing can run at. There are lots of optos out
there which are not very speedy. Passing a 10MHz signal
with optos, used to be a bitch. There are plenty of
slow optos though, if you need, say, 300 baud.

The first time you do a home project like this, and
see the waveforms coming out of your home-made opto,
you'll have more respect for the people who make
good ones for a living.

Paul

I have a dumb question. I have an older laptop here that I use everyday
that I purchased in 2010 and is running version 1809 of Windows 10 Pro. It
is a business laptop and has a rs232 interface (even has a modem :-)). Why
don't you shop for an older laptop with rs232? The reason I use this older
laptop is I like the keyboard better than the new keyboards. Now it moves
past my ability because he would have to link the older computer to his new
computers over the network so he could print through it. I would assume the
older laptop could be setup as a print server.
--
Bill

Brought to you from Anchorage, Alaska

T wrote:
Hi All,

I have a customer with a Mac and a w10 laptop and a CNC machine
with an RS232 (only) interface. He wants to be able to send
text files to the CNC machine. The Mac has USB3 and Thunderbolt
interfaces on the back. The W10 laptop has usb3 ports.

Now I could go the the various accessories sites and get
such an adapter, but they are typically trash and don't
work for beans. The customer did state this was his
experience. (Mine too.)

Any one know of a USB3 to RS232 adapter THAT ACTUALLY
WORKS RIGHT?

Many thanks,

-T

T wrote:
On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D


Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

I'm about a couple deccades younger than you and know what RS232. Does
that make me old too?

-A
--
Quote of the Week: "The shadows now so long do grow,... That brambles
like tall cedars show,... Molehills seem mountains, and the ant...
Appears a monstrous elephant." --Charles Cotton's poem
Note: A fixed width font (Courier, Monospace, etc.) is required to see this signature correctly.
/\___/\ Ant(Dude) @ http://aqfl.net & http://antfarm.home.dhs.org /
/ /\ /\ \ http://antfarm.ma.cx. Please nuke ANT if replying by e-mail.
| |o o| |
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On 8/12/19 5:41 PM, Ant wrote:
T wrote:
On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D


Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

I'm about a couple deccades younger than you and know what RS232. Does
that make me old too?

-A


Welcome to the Dark Side!

On 8/12/19 9:39 AM, Bill Bradshaw wrote:
I have a dumb question. I have an older laptop here that I use everyday
that I purchased in 2010 and is running version 1809 of Windows 10 Pro. It
is a business laptop and has a rs232 interface (even has a modem :-)). Why
don't you shop for an older laptop with rs232? The reason I use this older
laptop is I like the keyboard better than the new keyboards. Now it moves
past my ability because he would have to link the older computer to his new
computers over the network so he could print through it. I would assume the
older laptop could be setup as a print server.

That idea went through my mind several times. The data
going to the CNC machine from the laptop runs a $$$$ CAD
program that is a power hog. The customer spend 5,000 U$D
on the new laptop.

If I don't get the cable adapter working, using an old
laptop as a server is a good idea. But make sure it
has a USB port free to run a "sneaker" net over to
it. And leave the old laptop sitting on the CNC
machine's utility table.

T wrote:
On 8/12/19 5:41 PM, Ant wrote:
T wrote:
On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D


Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

I'm about a couple deccades younger than you and know what RS232. Does
that make me old too?

-A


Welcome to the Dark Side!

:P
--
Quote of the Week: "The shadows now so long do grow,... That brambles
like tall cedars show,... Molehills seem mountains, and the ant...
Appears a monstrous elephant." --Charles Cotton's poem
Note: A fixed width font (Courier, Monospace, etc.) is required to see this signature correctly.
/\___/\ Ant(Dude) @ http://aqfl.net & http://antfarm.home.dhs.org /
/ /\ /\ \ http://antfarm.ma.cx. Please nuke ANT if replying by e-mail.
| |o o| |
\ _ /
( )

On Mon, 12 Aug 2019 19:41:30 -0500, NT (Ant) wrote:

T wrote:
On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D


Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

I'm about a couple deccades younger than you and know what RS232. Does
that make me old too?

Possibly not you, but maybe your equipment?

--


Eric Stevens

There are two classes of people. Those who divide people into
two classes and those who don't. I belong to the second class.

T wrote:
On 8/12/19 9:39 AM, Bill Bradshaw wrote:
I have a dumb question. I have an older laptop here that I use
everyday that I purchased in 2010 and is running version 1809 of
Windows 10 Pro. It is a business laptop and has a rs232 interface
(even has a modem :-)). Why don't you shop for an older laptop with
rs232? The reason I use this older laptop is I like the keyboard
better than the new keyboards. Now it moves past my ability because
he would have to link the older computer to his new computers over
the network so he could print through it. I would assume the older
laptop could be setup as a print server.

That idea went through my mind several times. The data
going to the CNC machine from the laptop runs a $$$$ CAD
program that is a power hog. The customer spend 5,000 U$D
on the new laptop.

If I don't get the cable adapter working, using an old
laptop as a server is a good idea. But make sure it
has a USB port free to run a "sneaker" net over to
it. And leave the old laptop sitting on the CNC
machine's utility table.

How about the cheapest small computer you can find that has the power (I am
assuming computation power) that can run the program and you can stick a
rs232 card in? This would be less costly than a laptop.

Bill

Ant wrote:
T wrote:
On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D

Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

I'm about a couple deccades younger than you and know what RS232. Does
that make me old too?

Well, if 'a couple' is two, then you probably would have needed RS232
at some point to connect things like modems, printers, etc., so no, you
weren't old then, nor now. [1]

[1] I *have* to say that, otherwise I'm in trouble with LSWMBO and even
more so with VLSWMBO.

On Tue, 13 Aug 2019 09:30:06 -0800, Bill Bradshaw wrote:

If I don't get the cable adapter working, using an old
laptop as a server is a good idea. But make sure it
has a USB port free to run a "sneaker" net over to
it. And leave the old laptop sitting on the CNC
machine's utility table.

How about the cheapest small computer you can find that has the power (I am
assuming computation power) that can run the program and you can stick a
rs232 card in? This would be less costly than a laptop.

You can still get motherboards with com ports built in. The Asus
Q270M-C/CSM has two com headers for instance and that was the first
board I looked at.

--
Regards - Rodney Pont
The from address exists but is mostly dumped,
please send any emails to the address below
e-mail rpont (at) gmail (dot) com

Frank Slootweg wrote:
Ant wrote:
T wrote:
On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D

Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

I'm about a couple deccades younger than you and know what RS232. Does
that make me old too?

Well, if 'a couple' is two, then you probably would have needed RS232
at some point to connect things like modems, printers, etc., so no, you
weren't old then, nor now. [1]

Yep. I used external dial-up modems back then and laplink cables. I
don't think I ever use printers on those COM/serial ports since I used
parallel.

--
Quote of the Week: "The shadows now so long do grow,... That brambles
like tall cedars show,... Molehills seem mountains, and the ant...
Appears a monstrous elephant." --Charles Cotton's poem
Note: A fixed width font (Courier, Monospace, etc.) is required to see this signature correctly.
/\___/\ Ant(Dude) @ http://aqfl.net & http://antfarm.home.dhs.org /
/ /\ /\ \ http://antfarm.ma.cx. Please nuke ANT if replying by e-mail.
| |o o| |
\ _ /
( )

On 8/12/19 6:44 PM, Ant wrote:
T wrote:
On 8/12/19 5:41 PM, Ant wrote:
T wrote:
On 8/11/19 5:11 AM, Carlos E.R. wrote:
By the way, you guys realize that admitting you know RS232
means you are all old farts?

Oops.:-D


Chuckle. I am 62. How about you?

You got the cane shake thing down yet? "[shaking cane at
the heavens] K-i-i-i-i-i-i-d-s The-e-e-e-se Days !!!"

:-)

-T

I'm about a couple deccades younger than you and know what RS232. Does
that make me old too?

-A


Welcome to the Dark Side!

:P


This is what is in store for you!

https://www.amazon.com/s?k=canes+and...f=nb_sb_noss_1

On 8/13/19 1:57 PM, Ant wrote:
Yep. I used external dial-up modems back then and laplink cables. I
don't think I ever use printers on those COM/serial ports since I used
parallel.

I have a few customers who still use com ports on their
point of sale printers and one that uses a com port
for a package weigh scale.