build a modem
Hello again,
I think I have a better understanding now.
u say about this
" you want an actual PC modem...for connecting to the internet ".
Sorry, I thought you wanted to browse the web.
So, am I right in thinking you want this setup:
PC (VB6) - > 16F84A (programmed with PICBASIC) -> Sony T610 phone.
This link has exactly what you want:
https://www.usbdeveloper.com/GSMModule/USBDeveloper.GSMcable.html
But, as you said...you want to build it yourself, am I correct?
Well, you *might* not need the PIC. The cable in the picture on that website is very small, so I think it just connects directly to the phone, using RS232, with possibly some level-shifting electronics (resistors, transistors, caps etc..).
The difficult part would be finding a connector for the phone. Once you have that, it should just be a case of adding a 'buffer' (like two logic inverters on each line, Tx, and Rx) and connecting it to your PC.
Pinouts:
https://pinouts.ru/data/erics_t28.shtml
pin 10: GND
pin 4: Rx (connected to PC's Tx)
pin 5: Tx (connected to PC's Rx)
And pins 2 and 3, say they are used as CTS and RTS.
I hope this helps. Once you can communicate with it on your PC, I'm sure theres software about that can control it, or maybe you could write your own.
Regards,
BuriedCode.