
Chapter 9: Maintenance and Options
88
Alpha 600sc User’s Guide
The pin description for the serial port on the cash register is shown below.
Pin number
Pin No.
I/O
Signal Name
Abbreviation
1
NC
2
IN
Receive Data
RXD
3
OUT
Transmit Data
TXD
4
NC
5
N/A
Signal Grand
SG
6
NC
7
OUT
(Request to send)
RTS
8
IN
(Clear to send)
CTS
9
OUT(+5V) Power supply for BCR
+5V