board dimension
Pin Definitions
| index | pin | Function | mode |
|---|---|---|---|
| 1 | L+ | pair with - bus control pin L | |
| 2 | BL | bus control pin L | |
| 3 | V+ | pair with - bus control pin H | |
| 4 | BH | bus control pin H | |
| 5 | TX | data | direct from chip |
| 6 | RX | data | direct from chip |
| 7 | BRK | error indicator | direct from chip |
| 8 | HP | baudrate select | direct from chip |
| 9 | VIN | chip Power supply in | |
| 10 | GND | chip Power supply gnd | |
| 11 | 3V3 | LDO regulated OUT |
- pin 8 keep float for 9600 bps