BIXOLON SRP-E770III Series, Service Manual, Page: 26 / 63

SRP-E770III
4) Signal Description
Signal Name Signal Direction Function
Frame GND - Frame Ground
TxD Output Transmit Data
RxD Input Receive Data
RTS Output
Ready To Send
Ready to exchange data
CTS Input Clear To Send
DTR Output Data Terminal Ready(Almost same function as RTS)
DSR Input Data Set Ready(Almost same function as CTS)
Signal GND - Signal Ground
5) S/W Flow Control
When Xon/Xoff flow control is selected, the printer transmits Xon(ASCII 11h) or Xoff(ASCII 13h) signal
hrough the TxD line. If the printer is busy, the printer transmits XOFF to host through the TxD line.
Then the host recognize that the printer is now busy. So the host does not transmit a data to the printer.
If the printer is released from busy state, the printer transmits Xon to host through the TxD line.
Then the host recognize that the printer is not busy. And the host can transmit a data to the printer.
6) H/W Flow Control
When H/W flow control is selected, the printer checks whether the host is BUSY or not before sending
data. If the host is BUSY the printer does not transmit data till the host becomes NOT BUSY.
Ver. 1.01
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