Post by thread:[PICLIST] USB<->RS232 TTL serial adaptor : USB in,

I wish to make a USB -> RS232 TTL serial adaptor. It plugs into the USB port, and provides 4 wires out - +5V, GND, and TX/RX at 0V/5V TTL levels. All I'm interested in is the hardware. The hardware will look very simple - a USB plug on one end, and a 4-pin plug on the other. In your experience, could you recommended an appropriate USB <-> serial chip? Maybe something off the shelf? The main thing is, it needs TTL RS232 out, and a +5V power supply as well, to power the target circuit. 90mA maximum load. I dont mind programming in C++ to interface to it. I dont need a PIC16C765 - I wish to interface to a smaller product that uses a PIC12C672, via a PC computer, without having the adaptor built into the target circuit. Regards, Shane. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Hi, Thanks for the info (below), but ... The target circuit needs TTL RS232, +5V/0V, and there isnt room for a max232 chip in the target circuit, to convert the rs232 back into TTL levels. It also needs a 5V power supply to power the target circuit. Additionally, it needs our own 4-pin plug coming out of the unit to connect to the target circuit. Any more ideas? It would be possible to build out own - anybody know of any USB -> RS232 TTL chipsets out there? Cheers, Shane. > {Original Message removed}

See the ft8U232 - USB Uart at http://www.ftdi.co.uk/ft232r08.pdf Harold On Tue, 3 Jul 2001 11:36:20 +1200 Shane Tolmie <spam_OUTshaneTakeThisOuTKEYGHOST.COM> writes: {Quote hidden}> I wish to make a USB -> RS232 TTL serial adaptor. It plugs into the > USB port, and provides 4 wires out - +5V, GND, and TX/RX at > 0V/5V TTL levels. All I'm interested in is the hardware. > > The hardware will look very simple - a USB plug on one end, and a > 4-pin plug on the other. > > In your experience, could you recommended an appropriate USB <-> > serial chip? Maybe something off the shelf? The main thing is, it > needs TTL RS232 out, and a +5V power supply as well, to power the > target circuit. 90mA maximum load. I dont mind programming in > C++ to interface to it. > > I dont need a PIC16C765 - I wish to interface to a smaller product > that uses a PIC12C672, via a PC computer, without having the > adaptor built into the target circuit. > > Regards, > Shane. > > -- > http://www.piclist.com hint: The list server can filter out > subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > FCC Rules Online at http://hallikainen.com/FccRules Lighting control for theatre and television at http://www.dovesystems.com ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: dl.http://www.juno.com/get/tagj. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.