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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 Transmit 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
7
8
35
DB25
2
73
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
2 RxD-
⇐
⇐⇐
⇐
3 TxD-
3 TxD-
⇒
⇒⇒
⇒
2 RxD-
5 GND
⇔
⇔⇔
⇔
5 GND
7 RTS-
⇒
⇒⇒
⇒
8 CTS-
8 CTS-
⇐
⇐⇐
⇐
7 RTS-
ChartScan Connection
(RS-422)
DB9 Male
Pin & Signal
Cable Wiring
1 RxD+
⇐
⇐⇐
⇐
2 RxD-
⇐
⇐⇐
⇐
3 TxD-
⇒
⇒⇒
⇒
4 TxD+
⇒
⇒⇒
⇒
5 GND
⇔
⇔⇔
⇔
6 RTS+
⇒
⇒⇒
⇒
7 RTS-
⇒
⇒⇒
⇒
8 CTS-
⇐
⇐⇐
⇐
9 CTS+
⇐
⇐⇐
⇐