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Hello,
I have problem with connection of my Opentherm gateway (USB version).
I tried connect OTG to computer with MS Windows and also Raspberry PI and in OTM no response.
I tried to measure the outputs according to procedure in Troubleshooting and all values were alright.
But the values on IC1 are suspect.
Pin1: 1,23V
Pin2: 4,85V
Pin3: 5,01V
Pin4: 5,00V
Pin8: 5,00V
Pin9: 5,00V
Pin10: 5,00V
Pin11: 5,01V max value (fluctuating)
Pin12: 5,01V
Pin13: 5,01V
Pin17: 3,01V
Does anyone know, what to do?
Can I find out, that the chip contains the firmware?
Thanks Richard

spratek wrote:I tried connect OTG to computer with MS Windows and also Raspberry PI and in OTM no response.

No response to what?

You indicate pin 11 is fluctuation. That's the serial transmit line, which suggests the gateway is transmitting something. If you don't see anything when you power up the device, I suspect your serial connection is incorrect. Did you install the jumpers instead of IC2? Is the USB-serial converter connected correctly? Did you connect to the correct serial port with otmonitor?

Hello,
one learns from mistakes.
You're right, the fault is in the cable. Since yesterday, I know, what is a USB TTL cable.
Thank you very much.
R.M.