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1 Protective Ground (FG) - Printer's chassis ground
2 Transmitted Data (TXD) Out Printer has transmitted serial data
3 Received data (RXD) In Printer has received serial data
4 Request to Send (RTS) Out Always positive
5 Clear to Send (CTS) In Ignored
7 Signal Ground (SG) - Return path for data control signal
11 Reverse Channel Out Connected to Pin 20
20 Data Terminal Ready (DTR) Out Positive when the printer is ready to
accept data, andnegative when the
printer is not readyIN/OUT refer to the di
rection of signal flow as viewed from the printer
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