I just started working with 550sr. Depending on boot up sequence I get two “modes”; on module red LED is always on, and two green leds flash quickly (one being on, one off at any time, switching in between); or where only middle led flashes more slowly.
Either way, in both of these modes module is found from the LAN side by config app.
However, I need to control module via RS232 (115200 8N1 no flowctrl, as listed as default), but module is not responding anything, despite being found in LAN (I haven’t changed the settings, just checked that module is found). I’ve tried AT\r\n and +++ sequence both, but nothing is sent by module. I’ve verified (with oscilloscope) that RX line does receive command correctly, but TX line remains constantly high with nothing happening.
What might be wrong here?