Serial Interface Circuit - Brother SC-2000 Service Manual

1.10

Serial Interface Circuit

Fig. 3.10 shows the serial interface circuit.
#4 is a driver IC for RS-232C and converts logic level signals into RS-232C signals.
The RXD- signal is a print data input signal from the computer and transferred at
57.6 K baud rate. The TXD- signal is a status information output signal to the
computer, and the DTR signal is a busy signal. The RXD+ signal indicates that
power is supplied to the SC-2000.
Fig. 3.10 Serial Interface Circuit
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