Serial Port Pin Connectors - Omega Engineering OMB-CHARTSCAN 1400 User 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.
Computer
DB25
2 3 4 5 7
ChartScan to PC Connection
DB9 Male
Pin & Signal
2
3
5
7
8
ChartScan Connection
DB9 Male
Pin & Signal
1
2
3
4
5
6
7
8
9
3-8
NetScan Computer
DB25 DB9
DB9
TXD 2
2 RXD
2 3 5
RXD 3 3 TXD
CTS 5 5 GND
GND 7 7 RTS
7 8
RTS 4
8 CTS
Interface Wiring Diagram
Cable
Wiring
RxD- ⇐ ⇐ ⇐ ⇐
TxD- ⇒ ⇒ ⇒ ⇒
GND ⇔ ⇔ ⇔ ⇔
RTS- ⇒ ⇒ ⇒ ⇒
CTS- ⇐ ⇐ ⇐ ⇐
(RS-422)
Cable Wiring
RxD+ ⇐ ⇐ ⇐ ⇐
RxD- ⇐ ⇐ ⇐ ⇐
TxD- ⇒ ⇒ ⇒ ⇒
TxD+ ⇒ ⇒ ⇒ ⇒
GND ⇔ ⇔ ⇔ ⇔
RTS+ ⇒ ⇒ ⇒ ⇒
RTS- ⇒ ⇒ ⇒ ⇒
CTS- ⇐ ⇐ ⇐ ⇐
CTS+ ⇐ ⇐ ⇐ ⇐
Pin #
NetScan
1
DB9 DB9
2
RXD 2 2 RXD
TXD 3 3 TXD
3
GND 5 5 GND
4
RTS 7
7 RTS
5
CTS 8
8 CTS
6
7
8
9
(RS-232)
DB9 Female
Pin & Signal
3 TxD-
2 RxD-
5 GND
8 CTS-
7 RTS-
RS-232 Signal
Pin Description
No connection
Receive Data (RxD-)
Transmit Data (TxD-)
No connection
Ground
No connection
Request to send (RTS-)
Clear to send (CTS-)
No connection
ChartScan User's Manual
N/A
Input
Output
N/A
Ground
N/A
Output
Input
N/A