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请问SCI用USB转TTL和PC机通讯为何会出现问题?

我用的是DSP2812的SCI,一开始用RS232与PC通讯没问题,但是改用USB转TTL后,能发送数据但是接收不了,用示波器测量DSP的RX端,如下图所示,低电平是在2V以上,DSP识别成高电平,相当于没接收到数据,PC机经过USB转TTL出来的TX端电平没问题阿,可是一接到DSP得RX端,电平就被抬高了,请问这是怎么回事?