Some basic information on the hardware. For details please refer to the service manual.
Tranceiver and front panel both use an RJ12 6P6C jack and a straight connection cable.
RJ12 Plug
| Pin | Signal | Remarks |
|---|---|---|
| 2 | Audio | Audio amp output for headphones or ext. speaker |
| 3 | Power button | Only connected to the TRX, not the panel's microcontroller |
| 4 | GND | |
| 5 | 8V | TO DO: measure current draw |
| 6 | Data TRX->PAN | |
| 7 | Data PAN->TRX |
Hint: RJ12 plugs do fit in RJ45 couplers -> Easy, non-destructive way to sniff the signal.
This is a normal UART. The data lines operate at 5V logic level.
The bitrate is 62 kBit/s, 8N2.