common pin definitions
| Pin | Functions |
|---|---|
| VBUS | Power supply from USB port |
| VIN | Power input up to ~18V |
| 3V3 | on board 3.3V LDO output |
| DTR | UART DRT pin |
| ~RI | UART RI pin |
| RXD | UART receive via logic shifter |
| TXD | UART send via logic shifter |
| PEN | on board dcdc power supply enable default on |
| GND | board power supply ground |
| RST | gpio_control_reset |
obseleted
| pin | function |
|---|---|
| 3v3 or bat | direct system power supply |
| vin | external high voltage supply |
| gnd | Power Ground |
| p_en | on board power chip enable pin |
| logic_pwr | logic power level supply |
| rx | RXD |
| tx | TXD |
| boot | M2M module boot pin |
| .. | .. |