Electronics > Projects, Designs, and Technical Stuff

'Real' RS232 USB Interface

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coromonadalix:
would it be safer to add an polyfuse (auto resettable)  for the vcc supply line ?? in case of excessive currents or a short ?

delfinom:

--- Quote from: Gandalf_Sr on August 25, 2019, 05:30:38 pm ---I have a GPSDO that needs a 'real' (as in -ve and -ve voltages) RS232 and the Prolific cable that I bought causes all kinds of weird issues.  I looked around but real RS232 adapters are not easy to find and many have flakey drivers or fake FTDI chips.

--- End quote ---

FTDI literally makes their own completed adapters you can then source from Digikey or other legit distributors....

https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/UC232R-10/768-1014-ND/1836392
https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/UT232R-200/768-1084-ND/2441372

Yansi:

--- Quote from: NiHaoMike on August 26, 2019, 03:11:30 am ---I remember reading that very precise serial time references depend on low/predictable latency on a flow control line which a USB serial adapter will not do. There are PCIe serial cards available for fairly cheap that will work well for that.

--- End quote ---

Almost all USB/UART bridge ICs support RTS/CTS flow control.  It is even sometimes mandatory to be used for high baud-rates, as the slow shit-turd-USBVCP drivers may not keep up with the incoming traffic.

Problem also is, that surprisingly a lot of devices use the other 232 control lines (RTS, CTS, DCD, DSR) for additional arbitrary purposes  in software bit-banged modes, that simply do not work over USB-VCP.

Gandalf_Sr:

--- Quote from: delfinom on August 28, 2019, 12:36:43 pm ---
--- Quote from: Gandalf_Sr on August 25, 2019, 05:30:38 pm ---I have a GPSDO that needs a 'real' (as in -ve and -ve voltages) RS232 and the Prolific cable that I bought causes all kinds of weird issues.  I looked around but real RS232 adapters are not easy to find and many have flakey drivers or fake FTDI chips.

--- End quote ---

FTDI literally makes their own completed adapters you can then source from Digikey or other legit distributors....

https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/UC232R-10/768-1014-ND/1836392
https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/UT232R-200/768-1084-ND/2441372

--- End quote ---
In my experience, about 2/3 of the FTDI USB adapters out there use fake chips and although this FTDI cable is supposed to be by FTDI, it doesn't provide the same flexibility of my design.

delfinom:

--- Quote from: Gandalf_Sr on August 29, 2019, 12:02:50 am ---
--- Quote from: delfinom on August 28, 2019, 12:36:43 pm ---
--- Quote from: Gandalf_Sr on August 25, 2019, 05:30:38 pm ---I have a GPSDO that needs a 'real' (as in -ve and -ve voltages) RS232 and the Prolific cable that I bought causes all kinds of weird issues.  I looked around but real RS232 adapters are not easy to find and many have flakey drivers or fake FTDI chips.

--- End quote ---

FTDI literally makes their own completed adapters you can then source from Digikey or other legit distributors....

https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/UC232R-10/768-1014-ND/1836392
https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/UT232R-200/768-1084-ND/2441372

--- End quote ---
In my experience, about 2/3 of the FTDI USB adapters out there use fake chips.

--- End quote ---

These are manufactured as official products by FTDI and sold via major electronic component distributor.
You are basically saying that Digikey is somehow getting fake chips from FTDI themselves. DigiKey has a standing policy where they will only source from the manufacturer OR from distributors specifically indicated as legitimate by the manufacturer.

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