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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/737853/trs3122e-about-trs3122e-receiver-input-logic
尊敬的支持团队：
对于 RS232、逻辑高电平通常为-3~-15V、逻辑低电平为3~15V、为什么在 TRS3122E 中、接收器阈值 VIT+&VIT-都是正电压？ 太多了！
