USB to True Serial Converter

[aslamshaikh42]

hi,

I want to make a USB to serial converter I m using ft 232 ic can any one guide me how to use the output signals of ft232 for serial conversion

thanks

 

[Ian Rogers]

They already are - Rxd, Txd, CTS and the rest all available direct from the chip (TTL level) if you need to re-create the logic levels you will need a MAX232 chip or equivalent.

Cheers Ian

 

[Nigel Goodwin]

hi,

I want to make a USB to serial converter I m using ft 232 ic can any one guide me how to use the output signals of ft232 for serial conversion

thanks

Just consult the datasheet, however, you can probably buy such a converter for less money than the cost of the IC (converters can be bought for less then £1 in the UK).

 

[tunedwolf]

Just consult the datasheet, however, you can probably buy such a converter for less money than the cost of the IC (converters can be bought for less then £1 in the UK).

I know, it's getting ridiculous now. I can almost walk to FDDI's main office and the devices are more expensive for me to collect than I can buy a complete cable on flebay

 

[aslamshaikh42]

Thanks to all for reply

I hav made a usb to serial converter but it works slower than actual pc serial com port
for this project i m using ftdi's ft232 ic & a TTL to RS converter IC MAX3243
can any one HELP me FOR THIS PROBLEM

 

[Ian Rogers]

It should be the same!! 9600 baud is exactly what it say's 9600 bps. The problem will be throughput ie.. feeding and reading the chip.. I have this chip FT232RL running well over 250kbs. Are you using Hardware / software handshaking?

Cheers Ian

 

[aslamshaikh42]

Yes
im using all the hand shaking signals with pic programmer
thanks

 

[hexreader]

Yes
im using all the hand shaking signals with pic programmer
thanks

Which PIC programmer?

I suspect that many PIC programmers will only work reliably with REAL serial ports, not with USB to serial adapters.

Time to change to genuine Microchip PICkit2 or PICkit3 I think. Or if you have plenty of money, an ICD3

 

[Nigel Goodwin]

Thanks to all for reply

I hav made a usb to serial converter but it works slower than actual pc serial com port
for this project i m using ftdi's ft232 ic & a TTL to RS converter IC MAX3243
can any one HELP me FOR THIS PROBLEM

How slow is 'slower'? - the older converters/chips were very slow, a little under 9600 baud at their best because of the overhead involved with USB.

 

[aslamshaikh42]

thanks for reply
Actually the problem is that when connect it to JDM PIC programmer it does not respond but when i disconnect it
then the programmer name quickly pops up.
I have also tried with UC Flash programmer in this case it detects the programmer but when i start to program ic then it gives error "chip erase failed"
I have used ftdi's ft232 rl & ti's max 3243 equivalent ic sn65c3243 for rs conversion
so can u help me with it.

 

[Nigel Goodwin]

thanks for reply
Actually the problem is that when connect it to JDM PIC programmer it does not respond but when i disconnect it
then the programmer name quickly pops up.
I have also tried with UC Flash programmer in this case it detects the programmer but when i start to program ic then it gives error "chip erase failed"
I have used ftdi's ft232 rl & ti's max 3243 equivalent ic sn65c3243 for rs conversion
so can u help me with it.

JDM's are a rubbish programmer to start with, but they certainly won't work with a USB/Serial converter - you need a real serial port, or preferably a better programmer.

The days of parallel/serial port programmers are long gone now, I would strongly suggest you buy a PICKit2 or PICKit3, I've been using a PICKit2 for a couple of years now and it's great, I've also recently (a week ago) bought a PICKit3 in order to support a new PIC that I've started using, the enhanced 14 bit 16F1827 - it's a really nice chip, with lot's of nice features, and it's cheaper than the older 16F series.

The PICKit3 doesn't currently have the serial and logic analysers that the PICKit2 does, which is a shame - but neither did the PICKit2 originally, it was added in a later software update - apart from that, and the bright red colour I'm just as pleased with the 3.

 

[aslamshaikh42]

JDM's are a rubbish programmer to start with, but they certainly won't work with a USB/Serial converter - you need a real serial port, or preferably a better programmer.

The days of parallel/serial port programmers are long gone now, I would strongly suggest you buy a PICKit2 or PICKit3, I've been using a PICKit2 for a couple of years now and it's great, I've also recently (a week ago) bought a PICKit3 in order to support a new PIC that I've started using, the enhanced 14 bit 16F1827 - it's a really nice chip, with lot's of nice features, and it's cheaper than the older 16F series.

The PICKit3 doesn't currently have the serial and logic analysers that the PICKit2 does, which is a shame - but neither did the PICKit2 originally, it was added in a later software update - apart from that, and the bright red colour I'm just as pleased with the 3.

thanks for reply
Actually the problem is that when i connect it to JDM PIC programmer it does not respond but when i disconnect it
then the programmer name quickly pops up.
I have also tried with UC Flash programmer in this case it detects the programmer but when i start to program ic then it gives error "chip erase failed"
I have used ftdi's ft232 rl & ti's max 3243 equivalent ic sn65c3243 for rs conversion
so can u please help me with it.
It is urgent
thanks again

 

[Nigel Goodwin]

thanks for reply
Actually the problem is that when i connect it to JDM PIC programmer it does not respond but when i disconnect it
then the programmer name quickly pops up.
I have also tried with UC Flash programmer in this case it detects the programmer but when i start to program ic then it gives error "chip erase failed"
I have used ftdi's ft232 rl & ti's max 3243 equivalent ic sn65c3243 for rs conversion
so can u please help me with it.
It is urgent
thanks again

I've already told you, it won't work from USB - either get a better programmer (a USB one) or add a real serial port.

 

[aslamshaikh42]

OK........
BUT CAN WE MAKE REAL SERIAL PORT EXTERNALY
bECAUSE I M INTERESTED IN USB TO SERIAL CONVERTER
CAN WE DESIGN SOME REAL SERIAL PORT USING USB PORT
THANKS

 

[Nigel Goodwin]

OK........
BUT CAN WE MAKE REAL SERIAL PORT EXTERNALY
bECAUSE I M INTERESTED IN USB TO SERIAL CONVERTER
CAN WE DESIGN SOME REAL SERIAL PORT USING USB PORT
THANKS

For the third time - NO!!

 

[aslamshaikh42]

Ok

thanks
& sorry for irritating u
thank u very much for replies
i will search for something else.