Interfaces User guide128HandshakingHandshaking in the serial environment is most commonly handled bymanipulating the following 4 handshaking lines:` RTS (Request to Send)` CTS (Clear to Send)` DSR (Data Set Ready)` DTR (Data Terminal Ready)Ready/BusyWhen Ready/Busy protocol is selected, DTR will be used to pace thedata flow from PC. When the serial interface is BUSY (Buffer is full,Printer is out of paper or an error is detected), DTR will be dropped toindicate to PC that Printer cannot receive any more data.XON/XOFFWhen XON/XOFF protocol is selected, Printer indicates to PC that itis busy and not ready to receive any more data by sending an XOFF(DC3 X’13’) character. When the serial interface is ready to receivemore data, an XON (DC1 X’11’) will be transmitted.
