Samsung ER-51XX Programming & Operating Manual page 93

WIRING SPECIFICATION FOR PC & PRINTER
Samsung ER-5100 to Personnel Computer.
ECR
9 pin (male)
RXD 2 ............................................TXD 3.....................TXD 2
TXD 3 ............................................RXD 2.....................RXD 3
GND 5............................................GND 5.....................GND 7
Samsung ER-5100 to Kitchen/Slip Printer
ECR
9 pin (male)
RXD 2..........................................................TXD 2
TXD 3..........................................................RXD 3
DTR 4..........................................................DSR 6
GND 5.........................................................GND 7
DSR 8..........................................................DTR 20
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Computer
9 pin (female)
Printer
25 pin (male)
25 pin female