3-8 ChartScan User’s Manual

Serial Port Pin Connectors

An optional CA-47 cable (or equivalent) connects ChartScan to the computer. The ChartScan side of the cable has a
male DB9 connector for use with the RS-232/422 serial port. The cable’s computer side has 2 connectors: one for
DB9, and the other for DB25. Other crossover-type cables can be used if wired as shown in the figure. The
following table lists the RS-232 and RS-422 pin connections for a DB9.
Pin # RS-232
Pin Description
Signal
1 No connection N/A
2 Receive Data (RxD-) Input
3 Transmi t Data (TxD-) Output
4 No connection N/A
5 Ground Ground
6 No connection N/A
7 Request to send (RTS -) Output
8 Clear to send (CTS-) Input
DB9
2
78
35
DB25
273 5
4
Computer NetScan
DB9
RXD 2
TXD 3
GND 5
RTS 7
CTS 8
3 TXD
2 RXD
5 GND
8 CTS
7 RTS
DB9
DB25
Computer NetScan
TXD 2
RXD 3
GND 7
CTS 5
RTS 4
3 TXD
2 RXD
5 GND
8 CTS
7 RTS
DB9
Interface Wiring Diagram
9 No connection N/A
ChartScan to PC Connection (RS-232)
DB9 Male
Pin & Signal
Cable
Wiring
DB9 Female
Pin & Signal
2RxD-
3TxD-
3TxD-
2RxD-
5GND
5GND
7RTS-
8CTS-
8CTS-
7RTS-
ChartScan Connection (RS-422)
DB9 Male
Pin & Signal
Cable Wiring
1RxD+
2RxD-
3TxD-
4TxD+
5GND
6RTS+
7RTS-
8CTS-
9CTS+