I am trying to connect a Bluetooth module (BTM511) with my Arduino.
In order to see that I can actually communicate with the module, I first try to just send
AT<cr> to the module, where I should get an
<cr,lf>OK<cr,lf> from the module, using the signal generation function of my Scanalogic2 analyzer. Pin 1 (in output mode) of the analyzer is connected to the module's RX, pin 4 (in input mode) connected to the module's TX.
Now, when I send the AT command, I never get a reply back. The TX line stays LOW all the time. I DO get it work when I start the analyzer, setting it to wait sending for a logic change on Pin 4 and then, while it is waiting, connecting Pin 3 (which is in input mode) to the TX as well. Then somehow the TX line goes HIGH, and the module reports back with the OK signal.
I hope the situation is clear. Could anybody explain to me what might be happening here, and what I am doing wrong?