Epson TM-L500A Technical Reference Guide: RFID - Page 65
DSUB9, Pin no., DSUB25, Signal, direction, Function, data
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Page 65 highlights
Appendix DSUB9 Pin no. 7 8 9 DSUB25 Pin no. 4 Signal name RTS 5 CTS - SG Signal direction Output Input - Function Indicates whether or not the printer is BUSY. SPACE indicates that the printer is ready to receive data, and MARK indicates that the printer is BUSY. The printer goes BUSY when the printer is made offline by pressing down the On/Off Line button or when the receive buffer is full. Indicates whether or not the printer power is ON. SPACE indicates that the printer power is ON, and MARK indicates that the printer power is OFF. Indicates whether or not the host computer is ready to receive data. SPACE indicates that the host computer is ready to receive data, and MARK indicates that the host computer is not ready to receive data. When RTS/CTS control is selected, check the status of this signal before transmitting data. This signal is not used. Signal ground 65
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