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Add instructions about wiring
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Kyan Wanschers 2025-03-15 16:20:50 +00:00
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WACCA_Touch_Protocol.md
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# Unit board communcation
## Wiring
```
┌---------┐
|? ? ? A G|
|? ? ? B V|
└---|_|---┘
A: RS-485 A/-
B: RS-485 B/+
V: Vcc
G: GND
?: Unknown
```
This diagram shows the female IDC connector that is present on the ribbon cable with the notch positioned downwards. Connect a 12V power supply to the Vcc and GND pins. To communicate with the wedges connect a RS-485 transceiver to the A and B pins, additionally connect the ground of the transceiver to the GND pin. The unit boards communicate with a baud-rate of 921600.
## Command Packet Structure
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For the address the following values are used:
- Unit Boards -> Sync Board: 0xD0 + Unit Board ID
- Sync Board -> Unit Boards: 0xE0 + Unit Board ID
The address correlates to the id set on the rotary switch on the unit board.
#### Command ID
The following Command ID's are known:
- 0xA8: Get Unit Board Version
@ -15,7 +35,7 @@ The following Command ID's are known:
- 0x94: Set Thresholds
- 0x90: "Initialize" unit board
- 0xA1: Poll touch state
- 0xA3: Poll touch state (Analogue) (Not tested yed)
- 0xA3: Poll touch state (Analogue) (Untested)
#### Variable Data
This contains data, it has a variable length.
#### Checksum
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The unit boards respond with:
`0xD1 0xA1 0x80 0x00 0x00 0x00 0x04 0x00 0x00 0x00 0x00 0x00 0x00 0x01 0x75 0xF0`
#### 0xA3 - Poll touch state (Analogue)
#### 0xA3 - Poll touch state (Analogue) (Untested)
This command retrieves the touch state from the unit boards.
The sync board sends: