【经验】沁恒CH340B USB转UART桥接口芯片的配置及注意事项

时间： 2022-12-14 来源：世强

技术问答

CH340B是沁恒推出的一个USB转UART桥接口芯片，随着个人电脑升级发展，现在的计算机基本都不再提供RS232接口取而代之的是USB接口，但在工业控制、医疗仪器，等一些行业设备中对外的接口还是RS232，很多行业为了产品快速迭代支持USB接口，那么CH340B是一个很好的选择，不需要任何软件研发，只是硬件上加一颗CH340B原有的支持RS232的设备，就变成了USB接口了。

但是众所周知，USB设备都有PID和VID；VID是供应商ID，理论上每个USB供应商都有唯一的VID，而PID则是由供应商自定义的ID用来区分不同的产品。作为不同的厂家，在使用沁恒的CH340B芯片为自家设备提供USB接口支持的同事，当然也希望设备被插入电脑的时候，能够显示自家厂家的信息，而非沁恒作为厂家信息出现。

CH340B内置了EEPROM用于配置序列号厂家信息，我们今天就来说说如何去修改这些信息，首先需安装CH340B对应的VCP驱动，然后使用官网提供的“CH34xSerCfg.exe”软件进行修改，软件界面如下：

从上图可以看出和CH340B主要相关的设备厂商信息主要有如下几个部分可以配置：

Vendor ID(VID)：生产厂商ID，每个厂商的VID唯一

Product ID(PID)：产品ID，可以进行修改

Max Power(mA)：设备要求的总线电流值

Power Mode：USB电源模式可以选择总线供电模式或者自供电模式

Manufacturer String：厂商描述字符串

Product String：产品描述字符串

Serial String：产品序列号。配置产品序列号后使设备在该PC不同USB端口时串口号不变。

此软件不仅可以修改配置，也可以读取配置，当所有信息配置完成后，记得要生成对应的驱动，因为驱动是根据VID和PID来识别设备的。

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