Appendix Functions of each connector pin 70 Pin no. Signal name Signal direction Function 1 FG - Frame ground 2 RXD Input Reception data 3 TXD Output Transmission data 4 DTR Output 1) When DTR/DSR control is selected, this signal indicates whether the printer is BUSY. SPACE status Indicates that the printer is ready to receive data. MARK status Indicates that the printer is BUSY. Select the BUSY condition in the software setting mode. 2) When XON/XOFF control is selected, this signal indicates that the printer is properly connected and ready to receive data from the host. SPACE status The signal indicates that the printer is properly connected and ready to receive data from the host.
The signal is always SPACE, except in the following cases: During the period from when power is turned on to when the printer is ready to receive data. While the self-test is in progress. 5 SG - Signal ground 6 DSR Input This signal indicates whether the host computer can receive data. SPACE indicates that the host computer can receive data. MARK indicates that the host computer cannot receive data. When DTR/DSR control is selected, the printer transmits data after confirming this signal. (except if transmitted using some ESC/POS commands). When XON/XOFF control is selected, the printer does not check this signal.
7 RTS Output 1) When DTR/DSR control is selected, this signal indicates whether the printer is BUSY. SPACE status Indicates that the printer is ready to receive data. MARK status Indicates that the printer is BUSY. Select the BUSY condition in the software setting mode. 2) When XON/XOFF control is selected, this signal indicates that the printer is properly connected and ready to receive data from the host. SPACE status The signal indicates that the printer is properly connected and ready to receive data from the host. The signal is always SPACE, except in the following cases: During the period from when power is turned on to when the printer is ready to receive data.
While the self-test is in progress.