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#91
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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? |
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#92
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I need a usb3 to rs232 adapter that WORKS RIGHT
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 |
#93
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I need a usb3 to rs232 adapter that WORKS RIGHT
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 |
#94
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I need a usb3 to rs232 adapter that WORKS RIGHT
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 |
#95
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I need a usb3 to rs232 adapter that WORKS RIGHT
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| | \ _ / ( ) |
#96
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I need a usb3 to rs232 adapter that WORKS RIGHT
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! |
#97
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I need a usb3 to rs232 adapter that WORKS RIGHT
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. |
#98
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I need a usb3 to rs232 adapter that WORKS RIGHT
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| | \ _ / ( ) |
#99
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I need a usb3 to rs232 adapter that WORKS RIGHT
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#100
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I need a usb3 to rs232 adapter that WORKS RIGHT
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 |
#101
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I need a usb3 to rs232 adapter that WORKS RIGHT
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. |
#102
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I need a usb3 to rs232 adapter that WORKS RIGHT
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 |
#103
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I need a usb3 to rs232 adapter that WORKS RIGHT
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| | \ _ / ( ) |
#104
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I need a usb3 to rs232 adapter that WORKS RIGHT
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 |
#105
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I need a usb3 to rs232 adapter that WORKS RIGHT
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. |
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