RTI control module (to audio unit)
Before taking any readings, read Connecting the breakout box and checking the ground terminals .
The RTI control module terminals E1-E8 correspond to terminal #16-#23 on the breakout box.
| Control module terminal | Breakout box terminal | Signal type | Ignition on | Other |
|---|---|---|---|---|
| E1 | #16 | Clock signal to audio unit | Digital signal | Melbus protocol |
| E2 | #17 | Signal ground, sound | Ulow | - |
| E3 | #18 | 15 supply | Ubat | - |
| E4 | #19 | Data signal to audio unit | Digital signal | Melbus protocol |
| E5 | #20 | Busy signal to audio unit | Digital signal | Melbus protocol |
| E6 | #21 | Left audio channel | Alternating current on sound to loudspeakers | 150 mV rms +/- 38 mV (1 kHz 30% mod) |
| E7 | #22 | Right audio channel | Alternating current on sound to loudspeakers | 150 mV rms +/- 38 mV (1 kHz 30% mod) |
| E8 | #23 | Voice guide channel | Alternating current on sound to loudspeakers (for voice guidance) | 150 mV rms +/- 38 mV (1 kHz 30% mod) |
| H | Screen ground, cable to audio unit | Ulow | - |