EPSON TM-T88V Technical Reference Guide - Support

Functions of each connector pinPin no. Signal name Signal direction Function1 FG — Frame ground2 TXD Output Transmission data3 RXD Input Reception data4 RTS Output Equivalent to DTR signal (pin 20)6 DSR Input This signal indicates whether the host computer canreceive data.SPACE indicates that the host computer can receivedata. MARK indicates that the host computercannot receive data.When DTR/DSR control is selected, the printertransmits data after confirming this signal (except iftransmitted using some ESC/POS commands).When XON/XOFF control is selected, the printer doesnot check this signal.Changing DIP switch 2-7 lets this signal be used as aprinter reset signal.When you use this signal as the printer’s reset signal,the printer is reset when the signal remains MARK fora pulse width of 1 ms or more.7 SG — Signal ground20 DTR Output 1) When DTR/DSR control is selected, this signalindicates whether the printer is BUSY. SPACE statusIndicates that the printer is ready to receive data. MARK statusIndicates that the printer is BUSY. Set BUSY conditionswith DIP switch 2-1.2) When XON/XOFF control is selected, the signalindicates that the printer is properly connected andready to receive data from the host. The signal isalways SPACE, except in the following cases: During the period from when power is turned on towhen the printer is ready to receive data. During the self-test.25 INT Input Changing DIP switch 2-8 enables this signal to beused as a reset signal for the printer. The printer isreset if the signal remains at SPACE for a pulse widthof 1 ms or more.106