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求助Rt809H传口打印连接不上

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Post time: 2020-11-21 20:18:39 From the mobile phone
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参数设置更改VGA线序多次,然后点击串口打印均没有反应,测量VGA转3针线时,不接主板RX和TX为3.2v.接上助板一个为1v,一个为3v左右,测试多块主板都差不多电压,是不是编程器串口有毛病?
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Post time: 2020-11-21 21:41:27
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本帖最后由 技术支持008 于 2020-11-21 21:43 编辑

先检查CRT软件设置是否正确,设置正确的话选择编程器的    设置  USB串口自检   按照编程器提示操作,测试OK的话编程器串口没问题。编程器没接主板的时候串口电压3.3正常的,您也要测量主板串口电压不接编程器的时候是多少来判断一下。
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Post time: 2020-11-21 23:46:31
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串口是否有毛病,用软件就可以测试一下,简单直接。
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 Author| Post time: 2020-11-22 08:27:40 From the mobile phone
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有试一下,打开CCom4失败,代码0
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 Author| Post time: 2020-11-22 08:30:28 From the mobile phone
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技术老师看一下什么原因,
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Post time: 2020-11-22 10:08:16
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手机像素差可以电脑截屏,你拍摄图片真的看不清楚。
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Post time: 7 day(s) ago
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我也很困惑优势连不了
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