serial number | Pins | Pin orientation | remark |
1 | GND | input | Module ground |
2 | GND | input | Module ground |
3 | VCC | input | The module power supply is positively referenced, and the voltage range is 4 5~15V DC |
4 | VCC | input | The module power supply is positively referenced, and the voltage range is 4 5~15V DC |
5 | RESET | input | Module reset pin |
6 | AUX | outpu | Used to indicate the working status of the module; The user wakes up the external MCU and the output is low during POST initialization Level; (Can be suspended)
|
7 | TXD | output | TTL serial output, connected to external RXD input pin |
8 | RXD | input | TTL serial output, connected to external RXD input pin |
9 | M1 | Input (very weak pull-up) | In conjunction with M0, determine the 4 working modes of the module (non-suspended, groundable if not used). |
10 | M0 | Input (very weak pull-up) | In conjunction with M1, determine the 4 operating modes of the module (non-suspended,groundable if not used). |
11 | GND | input | Module ground |
12 | GND | input | Module ground |
13 | ANT | output | Antenna interface (high frequency signal output, 50 ohm characteristic impedance). |
14 | GND | input | Module ground |
15 | GND | input | Module ground |
16 | GND | input | Module ground |
17 | GND | input | Module ground |
18 | GND | input | Module ground |
19 | GND | input | Module ground |
20 | STATE | output | Module status indication output, if no dangling processing is used |
21 | 485-EN | Input/output | The enable control pin of the external 485 chip can be used if floating processing is not used |
22 | NC |
| No need to care, dangling handling |
23 | NC |
| No need to care, dangling handling |
24 | NC |
| No need to care, dangling handling |
25 | NC |
| No need to care, dangling handling |
26 | SWDlO |
| No need to care, dangling handling |
27 | GND | input | Module ground |
28 | SWCLK |
| No need to care, dangling handling |