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Epson Serial/RS-232 Cable DB9 to DB25 Cable Pinout -
Computer Name Computer Pin Direction Printer Pin Printer Name Description
RXD 2 <-- 2
TXD 3 --> 3
DTR 4 6
Ground 5 <--> 7
DSR 6 20
LOOP 7,8 ---
--- 4,5 LOOP

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