Hi, I am trying to read from Arduino which is a TTL board into a router that works on LVTTL (3.3v) called WRT54GL, with max3232.
I've first done these tests: 1. Connected TX of serial port of the router to Arduino directly, and issued commands, and all work fine. 2. I shorted TX and RX of the router to test if the port is working properly. I issued "echo hello" from TX and I had it right from RX back to the router. So this also worked fine.
Next, I used a schema I found online to connect them via max3232. I repeated the above test #1, but with the max3232 added in the middle, and it failed to work. I checked things more than 15 times, but no result. I'll provide the schema I used here, please give some ideas to help!