merlinn31 wrote:There are multiple boards, but this is the controller board that controls the logic. There are 3, 10-pin ribbon cables that run from the controller board and daisychain all of the LED driver boards together. Additionally, there is a honking power board that hooks up to the controller board.
Through continuity tests, it looks like the pinout of the 4pin header (JP15, last picture) near the MAX232A chip is [(Gnd) (0V) (-9.6V)(Gnd)], oriented with the picture.
http://creativeelectron.net/blog/wp-con ... /10/13.jpg
Pin 14 on the MAX232A is connected to the "0V" pin on the 4pin header. Pin 13 is connected to the -9.6V pin on the 4pin header. I rigged up a db9 according to the diagram in the picture above and jacked into it with the serial settings that are displayed on boot, but putty didn't like it. No status messages (which you said isn't uncommon), but also no echo to the terminal when I pressed keys. I'm interpreting this to mean that I'm not doing something right.
merlinn31 wrote:First, thank you for your help. The first thing I'm willing to admit to anyone is that I don't know anything about anything. My very basic understanding is only what I've read about RS232, which isn't much other than it operates at higher voltages than TTL lines. The diagram I linked to is one I found through google images searching for "MAX232 to DB9 pinout". The diagram I linked to shows 13 and 14 connecting to the DB9. Coincidentally, my board has them mapped to the middle two pins on the 4-pin connector JP15 at the bottom of the last picture. I have a null modem cable and am using it.
I'm confused - Are you saying that they aren't wired to the correct pins on the db9? What do you mean by the Tx-Rx bridge between pins 2/3? Are you also saying that I should connect Tx on the DB9 to pin 13 on the max232 and check BOTH 7 and 14 separately for return traffic at different baud rates?
My continuity tester says that pin8 on the max232 is Gnd. Not sure if that changes anything or not.
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