ETS2228 Maintenance Manual
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Page 14, Total 43
Input power level conversion circuit:
Figure 2 Input power level conversion circuit
Output power level conversion circuit:
Figure 3 Output power level conversion circuit
Data receiving signal power level conversion circuit. The power level conversion of signal
UART1_RX is accomplished by clamp circuit. The reason lies in that the signal power-level needs to be
lowered to detect whether or not the serial port line is connected when there are no data lines.
