> A few weeks ago there was considerable activity on Boot Loaders, just a
> quick question without a lot of detail, just wanted to make sure there
> wasn't some obvious roadblock.
>
> I have a 18F1320 (slave) that has USART going to onboard fiber optic
> transmitter/receiver (62.5/125um) that is then converted to 2 wire
> RS-485 with a B&B FOSTC converter and then to a PLC (TRI-PLC
> T100MD888)(master). The PLC is programmable and online
> monitoring/control via RS-232 to a PC. I also have a RS-232/RS-485
> converter and have talked to the PIC over the Fiber optic/Rs-485 network
> with a terminal program. I am thinking that either I can use the
> RS-232/RS-485 converter to use the boot loader (after having programed
> the 1320 with the boot loader) from a PC, or via the PLC which has been
> programmed to pass through the 1320 program.
>
> Comments?
>

Sounds like it should work. How are you going to start bootloader
execution? I typically check for a button press during power up. If the
button is down, I go in to the bootloader. If not, I go to the
application. It's possible to have the application also call the
bootloader, but should the application get corrupted, you need another way
to get to the bootloader.

Also, on bootloaders, I've started writing them to accept the Intel hex
ascii records directly with either DC1/DC3 or RTS/CTS handshaking. Nothing
special is then required on the host end, just send the ascii file.

Harold

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