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+--- Thread: PIC18F14K22 at 1,5km over (/showthread.php?tid=841)
PIC18F14K22 at 1,5km over - zidged - 2013-11-30
Hi,
I have changed PIC18F firmware and compiled.
"ds30 GUI Loader" can find the PIC sometimes.
I haven't programmed PIC yet. But some part of program reached to PIC.
I am using 5 x RS485 repeater for 1,5km. I think it is too much and they destroy the original baud rate.
Does anybody know an open source RS485 repeater?
RE: PIC18F14K22 at 1,5km over - Mikael Gustavsson - 2013-12-01
Hi,
Have tried at a short distance without repeaters? If not I suggest that you do that first to make sure that the boot loader setup is correct.
Then add one repeater at a time and study the signal to see if it gets destroyed.
BR
Mikael
RE: PIC18F14K22 at 1,5km over - zidged - 2013-12-02
Hi Mikael,
I have tried several times in short distance. It works well.
Then i inserted one repeater the short distance experiment, again it worked.
Long distance gives poor results.
My RS485 repeater is not smart. They don't record and replay the data stream. I mean they are transparent devices. So that adding repeater may cause start bit distortion and baud rate un-detection.
Mikael let me ask another question please.
I wrote fully working program in CCS C Compiler and i can use bootlader in a short distance. So how can i combine these two program?
If i can combine they maybe you can help me about uploading firmware over RS485 with usind devices' ID.
RE: PIC18F14K22 at 1,5km over - Mikael Gustavsson - 2013-12-09
Hi,
I am sorry for the late reply. The free editions has lower priority than the commercial version.
So I guess you need to improve your repeaters?
You "cannot" combine boot loader and application in one MPLAB IDE project.