Appendix D
Interfacing to an RS-232 Device
©
National Instruments Corporation
D-9
•
Wire a custom cable that properly interfaces the GPIB-232CT-A
hardware handshaking protocol to the handshaking protocol of your
serial device.
Minimum Configuration Cable
The minimum cable configuration assumes that the serial device does not
require external hardware handshaking. The minimum configuration for a
9-pin to 9-pin null modem cable is shown in Figure D-10. Figure D-11
shows an equivalent 9-pin to 25-pin cable.
Figure D-10.
Minimum Configuration for 9-pin DTE to 9-pin DTE
Figure D-11.
Minimum Configuration for 9-pin DTE to 25-pin DTE
1
5
6
7
8
9
5
1
9
8
7
6
GPIB-232CT-A
9-pin DTE
Serial Device
9-pin DTE
1
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
5
6
7
8
9
6
GPIB-232CT-A
9-pin DTE
Serial Device
25-pin DTE
