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Serial Printer (9-25) Epson Cable Pinout -
computer Name computer Pin Direction Epson printer Pin Epson printer Name Description
Receive Data (RxD) 2 <-- 2 Transmit Data (TxD)
Transmit Data (TxD) 3 --> 3 Receive Data (RxD)
Data Terminal Ready (DTR) 4 --> 6 Data Set Ready (DSR)
System Ground (SG) 5 --- 7 System Ground (SG)
Data Set Ready (DSR) 6 <-- 20 Data Terminal Ready (DTR)
Clear To Send (CTS) 8 <-- 4 Request To Send (RTS)

9 pin D-SUB female connector layout 25 pin D-SUB male connector diagram