simple serial link PIC2PIC?

[RGBrainbow]

Hi,

@Nigel Goodwin: In this thread () You wrote about a serial PIC2PIC link.

I'm looking for a safe and simple way to serially connect a bunch of lowend 4MHz PICs using normal portpins and no interrupt. Data rate is very slow (~70 bits per second) and the transmission is running only from time to time. Data to transmit is 8 bit. 1 up to 10 bytes are to be sent/received during a transmission process.
Can You give me some hints, how an applicable serial protocol could look like ?

regards
joachim
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[Nigel Goodwin]

I'm looking for a safe and simple way to serially connect a bunch of lowend 4MHz PICs using normal portpins and no interrupt. Data rate is very slow (~70 bits per second) and the transmission is running only from time to time. Data to transmit is 8 bit. 1 up to 10 bytes are to be sent/received during a transmission process.
Can You give me some hints, how an applicable serial protocol could look like ?

Just use a standard RS232 type link, as it's from PIC to PIC you don't need to bother with MAX232's to give the +/-12V signals - just connect directly from pin to pin.

The simple software routines in my RS232 tutorial work fine for this, I've used them many times.

 

[RGBrainbow]

Thank You very much.
In the tutorial i found the last pieces for the puzzle.
Thanks again.
regards
joachim