[charaf]

hello
why my port RS232 of laptop cant get more voltage
i have only +5 and -5
normally for programming pic i need +12 and -12
so please how can i do even get it this voltage
please

[Abdulla873]

Did you use , USB to Serial Converter???
if no, be sure it's RS232!!!

[charaf]

thanks
but im not used usb
im using RS232 of my laptop to programer jdm
now how can i do even get it voltage +12 -12

[Abdulla873]

Easy, just use IC max232, this will solve the problem
good luck

[charaf]

hi sir
sorry we cant use max232 because this device is designed for regular voltage from +12 to +5
for me i need increase voltage from +5 to +12 for programming pic with jdm

please help me

[Abdulla873]

No, it's converting +12 to +5 and vise versus
the same thing for negative voltage.
check this out in data sheet.
use max232 in inverse form, i.e. make the TTL side your
computer , and RS232 side your programmer
I did not use it before, but I think it will work

Eng. Abdullah

[charaf]

ok sir i will try
thanks so much

[Abdulla873]

You are welcome, Good luck