Hi!
I am commanding my ssc-32 from the linksys router wrt54gl correctly. Now I’d like to read sensors on the input of ssc32 into the router via serial connection. I have to connect RX of the router to TX of the ssc32. for the conversion, I used this:
But it didn’t work
I also tried to use arduino for testing purpose. I wrote a loop to constantly “Serial.println(“A”);delay(500);” to the router. I only connected TX of arduino to the RX of the router as above, but didn’t disconnect the routerTX->ssc32RX. When I run this configuration, the indicator of ssc32 is blinking syncronously with arduino, but in Linux shell of the router the command “echo < dev/tts/0” gives only a blank line! (on my router the serial for shell is on tts/1, so using tts/0 is ok and tested).
Please suggest me how to correct this! Are the resistors in the wrong place or the idea is totally wrong, or I have to use a MAX3222CWN or MAX3237 on the router (again a lot of soldering!).
Thank you 
Edit: ground is as usual common between sender and receiver.