in search of USB to TTL serial with DTR and RTS

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Hey ho, what do ya know?

 

I am in search of what the title reads.  I need a USB to TTL serial cable with both the DTR and RTS lines.  I am not going to go into the gory details as to why I need this, but I am hoping that someone here has seen one of these things somewhere and would be so kind to post a link,  while I continue my quest.

 

Cheerio!

Right Side Jim

 

EDIT:  Needs to be 5v TTL levels

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

Last Edited: Fri. Aug 28, 2020 - 12:25 AM
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Something like this? https://www.ebay.com/itm/CP2102N-USB-2-0-Micro-to-UART-Module-Serial-Converter-Adapter/313078414050

 

Edit: I know it's not really a cable, but it's trivial to add the "cable" part (just add a micro USB cable).

Last Edited: Thu. Aug 27, 2020 - 11:55 PM
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Hot snot!  That’s perfect!  Had not thought about eBay.

 

Thanks

 

jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Ahhh POOP!

 

Thats a 3.3v device.  I forgot to mention I need 5v TTL

 

 

Back to drawing board

 

JIm

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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I use one of these:

 

https://www.amazon.com/Adapter-Serial-Converter-Development-Projects/dp/B075N82CDL

 

Selectable 3.3V or 5V

Extra signals broken out on the bottom.

 

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balisong42 wrote:

I use one of these:

 

https://www.amazon.com/Adapter-Serial-Converter-Development-Projects/dp/B075N82CDL

 

Selectable 3.3V or 5V

Extra signals broken out on the bottom.

 

 

westfw wrote:

perhaps https://www.sparkfun.com/product... ?

 

Both are excellent options!  Thanks!

 

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Um, FTDI do the exact thing: https://uk.farnell.com/ftdi/c232...

 

They just work, available in 5v or 3v3 versions.

 

Neil

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This one came from eBay UK. CP2102 based:

 

 

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I picked up two off of Amazon last night....along with a couple of amazon 'suggestions'.  Will see how it turns out.  They will arrive on Saturday

 

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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If you do ever use the 3V3 output, just be careful how much current you draw. The one I showed uses the CP210x's internal regulator which is rated for 100mA max.

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I like CH340E modules, very compact little thingies:  https://www.aliexpress.com/item/32950811363.html

 

Serial I/O is 5V (from USB), these modules also have a 3.3V output from the internal regulator (not very useful because the I/O is fixed at 5V).

 

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"Dare to be naïve." - Buckminster Fuller

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module with an enclosure :  muArt USB-UART Converter

oooh.  Glossy Web Page!  Some features (galvanic isolation, substantial protection circuitry) that might be important under some circumstances!   And a jaw-dropping price tag to match!

 

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westfw wrote:

module with an enclosure :  muArt USB-UART Converter

oooh.  Glossy Web Page!  Some features (galvanic isolation, substantial protection circuitry) that might be important under some circumstances!   And a jaw-dropping price tag to match!

 

 

laugh

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Haha none of that for me, I role my own stuff. This one has a IOFF buffer used as a level shifter for an FT231, it doesn't care what voltage I plug into, it also doesn't glitch the serial (unless I have the serial open when I plug it in).

 

https://github.com/epccs/Driver/tree/master/USBuart

 

This one is sort of an R-Pi simulator; it has a CP2105 chip with two UARTs. One goes to where the R-Pi serial would go, and the other goes to a 328pb that can control some of the pins that an R-Pi would. Mostly I need that second UART to bridge to where the R-Pi does I2C at the moment.

 

https://github.com/epccs/RPUusb/

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Many years ago I made a breakout board for the FT232RL for workshop use and brought everything out to connectors.

 

I only built one but if you need the artwork I can try and generate Gerbers from the old artwork and you too can roll your own.

 

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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Well lets see what happens when my amazon orders arrive this weekend

 

JIm

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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"Dare to be naïve." - Buckminster Fuller

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jgmdesign wrote:

Ahhh POOP!

 

Thats a 3.3v device.  I forgot to mention I need 5v TTL

?

CP2102N is 5V tolerant on the IO, and TTL is 0.8V low and 2.4V Hi

Did you mean you need 5V CMOS swings, not TTL levels ?

 

If you do need 5V CMOS, that will need more care, as most USB-UARTS these days run the core at 3.3V or lower, and many targets are 3v3, so 5V hard pull-ups would be a pain in those systems.

 

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"Dare to be naïve." - Buckminster Fuller