LCD Serial Backpack Problems

Hello,

I just purchased these two items and connected them:

(1) Screen, LCD-00710 http://www.sparkfun.com/commerce/produc … cts_id=710

(2) Backpack, LCD-09352 http://www.sparkfun.com/commerce/produc … ts_id=9352

I have this connected to a notebook computer via USB/Serial dongle, with the port set to 115200, 8, 1, N (per the backpack documentation). When I send a character via terminal emulator or custom serial program, the screen responds immediately, but it displays the wrong character. For example, the letter “A” is displayed as an underscore “_”. I’m unable to send control commands this way because my data isn’t being interpreted properly.

Can anyone provide any additional information on how to proceed? Thanks!

Looking at the schematic, it wants TTL-level serial, not RS232 level. Hope it didn’t get fried (good chance it’s OK since those dongles tend to be wimpy).

Try using a USB-TTL level serial dongle (such as BOB-00718) instead.

/mike

OK, thanks! Will give that a try.