### COM/CAN接口说明

COM/CAN接口采用2\*4P弹簧端子，可选择配置RS232/RS485/RS422。

管脚示意图：

![](https://resource.helplook.net/docker_production/3648ne/article/ddruQXKF/6847e5c2a6637)

SX51管脚定义如下图所示：

| **管脚** | **RS232/CAN** | **RS422/CAN** | **RS485/CAN** |
|---|---|---|---|
| 1 | DCD | TX- | DATA- |
| 2 | COM\_GND | COM\_GND | COM\_GND |
| 3 | RXD | TX+ | DATA+ |
| 4 | CAN\_1\_H | CAN\_1\_H | CAN\_1\_H |
| 5 | TXD | RX+ | - |
| 6 | CAN\_1\_L | CAN\_1\_L | CAN\_1\_L |
| 7 | DTR | RX- | - |
| 8 | CAN\_GND | CAN\_GND | CAN\_GND |