无法在 .net 2.0 中接收串行数据，使用 rs232 到 rs485 转换器 [英] Can't receive serial data in .net 2.0, using rs232 to rs485 converter

问题描述

我使用 .Net 2.0 串行端口类.直到今天，我才遇到它.

I've done a good deal of RS232 work using the .Net 2.0 serialport class. I've never had trouble with it, until today.

我正在与使用 RS485 协议的公司硬件进行通信.我正在使用 B & 的 RS232 到 RS485 转换器设备.B 电子.

I'm communicating with a piece of company hardware that uses the RS485 protocol. I'm using an RS232 to RS485 converter device from B & B electronics.

我可以很好地发送数据，并看到它在另一端收到.但是，我的 data_received 事件从不触发，即使使用 BytesToRead 我也看不到任何返回.

I can send data just fine, and see it received on the other side. However, my data_received event NEVER fires, and even using BytesToRead I never see anything coming back.

ReadExisting 也为空.

ReadExisting comes up empty as well.

我们启动了 232Analyzer，我可以使用该应用程序发送和接收数据包.我假设这与 .Net 2.0 串行类有关.

We fired up 232Analyzer, and I can send AND receive packets with that application. I'm assuming this has something to do with the .Net 2.0 serial class.

有什么想法吗?

推荐答案

事实证明(经过数小时的研究和尝试)是这样设置的:

It turns out (after hours of researching and trying) that setting this:

.DtrEnable = True

.DtrEnable = True

成功了.我以前从未使用过 DTR 属性，但无论是我正在使用的这台设备的问题，还是我遗漏的其他东西 - 都做到了.

did the trick. I've never had to use the DTR properties before, but whether it's an issue with this one device I'm working with, or something else I'm missing - that did it.

我认为这可能会让其他人免于头痛.

I thought this might save someone else a headache down the road.

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