Dascom 1500 User Manual page 112

Serial interface (option)
Handshake
Handshaking in the serial environment is most commonly handled by software and/or
hardware. The manipulation of the hardware handshaking is handled by the following 4
lines:
}
RTS (Request to Send)
}
CTS (Clear to Send)
}
DSR (Data Set Ready)
}
DTR (Data Terminal Ready)
Ready/Busy (Hardware Handshake)
When Ready/Busy protocol is selected, DTR will be used to pace the data flow from PC.
When the serial interface is BUSY (Buffer is full, Printer is out of paper or an error is de-
tected), DTR will be dropped to indicate to PC that Printer cannot receive any more data.
XON/XOFF (Software Handshake)
When XON/XOFF protocol is selected, Printer indicates to PC that it is busy and not
ready to receive any more data by sending an XOFF (DC3 X'13') character. When the se-
rial interface is ready to receive more data, an XON (DC1 X'11') will be transmitted.
B-14
Interfaces