Rather an example of how NOT to do it.
We received a home-assembled ECU with a BT-serial (not RS232 but logiclevel serial "fbus") module inside ECU: an unsupported setup (connected wrong so it did not work and prevented VT communications; Disconnecting BT-RS232 => VT communication started to work immediately).
- Bluetooth inside a metal case will not work. (see "Faraday cage")
- First serial port: when VT is connected PC TX => ECU RX cannot be driven by the BT module, so BT module must be disconnected (this happens when DSUB9 connector is disconnected)
- but the module was connected inside the case to the ISP header, preventing the ST232 chip to drive main processor RX properly.
See BroadcastDatastreamAim for AIM only (not triggerframe), this way ECU => BT module one-way communication should work.
Second RS232 is preferred
- It can also
Possible Solutions:
- Should we provide a BT-RS232 module so that it can transmit from outside the metal case ?
- or... Should we connect 2nd serial TX => BT Module (inside the ECU) for AIM comm ?
- might work with ECU endplate removed