I placed 1k resistors in line on the scl and sda lines to try and give the PIC a little more protection.

Thanks again for the help. You guys have a great forum!

Beautiful! Thanks so much for the help.

Ok, so is there any way I can set up the display so that I can use I2C and RS232 together but not at the same time? (short of building a I2C to RS-232 conversion circuit) Can I solder the jumpers to a switch that allows me to switch back and forth between the two protocols?

Here is what I am trying to do, the microcontroller would communicate with the display over the I2C lines, and then would shut itself off, then a PC would communicate with the display over the RS-232 lines. So you are telling me this is not possible, right?

So, since the traces use the same data ...

R2.0

If I want to use both RS-232 and I2C but not at the same time, can I have both jumpers soldered?

Thanks so much for the help and the code I am using is already based on the sample code you mentioned.

One more question...Is there any jumper settings or anything I need to change on that display to get I2C to work?

Thanks for clearing up the Byte vs. bit issue. I was taught that a B means Byte and a b means bit so I was a tad confused. :) I have read the I2C guide you provided, but it seems my display will respond to addresses that are not meant for it. I have been using the 0x50 address and get garbage ...

Hello everyone.

I have a LK202-25-R-V that I m trying to write to over the I2C bus using a Motorola M68HC908JK3CP. My code is written in assembly and is based exactly on the ping.be website MO recommends. I have read all the information on this forum that I can regarding I2C, however I still ...