Hi everyone, I'm having a problem with my Mesa setup and hope someone can help me figure out what's going on. My setup consists of: - Mesa 7i96S- Mesa 7i85- Mesa 7i84 connected to the 7i85 via Smart Serial (sserial) The 7i84 works perfectly, but only on Smart Serial channel 4 of the 7i85. I've tried connecting the 7i84 to other channels and adjusted the HAL configuration accordingly, but it only works on channel 4. I recently wanted to connect another Smart Serial device using an additional cable, but I couldn't get it to work either. So I decided to take some measurements directly at the 7i85. Measurements with power OFF: - Channel 4: Resistance between RX and /RX is approximately 120 Ω.- All other channels: Resistance between RX and /RX is infinite (open circuit). Measurements with power ON: Channel 4: - RX to GND: 2.7 V- /RX to GND: 2.7 V All other channels: - RX to GND: 0 V- /RX to GND: 5 V These measurements seem quite different between the working channel 4 and all the other channels. My questions: 1. Is this behavior normal, or does it indicate a hardware problem with the 7i85?2. Has anyone experienced a similar issue with the Smart Serial channels on a Mesa 7i85?3. Could the missing 120 Ω resistance indicate a problem with the RS-422 termination or transceiver circuitry?4. Is there anything I can check or repair myself, or does the board need to be replaced? Any advice or suggestions would be greatly appreciated! Thanks in advance!
