勾选十六进制的情况下:
传输值 | 串口调试助手显示值
1 | FF 1C
2 | FF E0
3 | FF FC
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a | FF 1C FC
A | FF 1C FC
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b | FF E0 FC
B | FF E0 FC
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c | FF FC FC
d | FF 00 E0 FC