Hello... I have a question...
I have an Eeprom (and PIC) programmer (JDM as Ludipipo) with RS232 9 pin serial port and I have a FTDI232 USB-232 adapter...
can I use it to connect JDM programmer to my laptop?
I connected all the pin but I don't know where to connect pin 7 (Request To Send) in my FTDI232... and my IcProg doesn't work (no acknowledge received).
My configuration is:
-Windows API
-Enable MCLR to Vcc
Thanks!
Hi smart cat, and welcome.
A JDM programmer uses a trick to get its power, and it relies on a standard PC COM port and its levels ( +/- 12 volts, at least 10 volts) to work correctly.
That's also the reason why you need more pins than just pins 2, 3 and 5.
A USB to serial adapter doesn't necessarily offer levels like that, you'd need an additional piece of hardware like a Maxim 232cpe with complementary capacitors.
Also lots of USB to serial adapters do not offer all serial pins, but keep it with 2,3 and 5 (RX, TX, GND).
The FTDI chip does offer all pins, remains to be seen if the adapter of your choice has implemented them all.
Ok thank you very much..
I will try with another system.. (excuse for my bad english)