Appendix E
Interfacing to a Serial Device
© National Instruments Corp.
E-9 GPIB-232CT-A for MS-DOS/Windows
Interfacing the GPIB-232CT-A to a DTE without
Handshaking
If your serial device does not require or use the same hardware handshaking
protocol used by the GPIB-232CT-A, you have two options:
•
Use a minimum configuration null mo dem cable which does not support
the hardware handshake lines and use XON/XOFF software
handshaking (if necessary). To create a minimum configuration cable,
connect the signals shown in bold italics in Table E-3.
•
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 E-8. Figure E-9 shows
an equivalent 9-pin to 25 -pin cable.
1
5
6
7
8
9
GPIB-232CT-A
9-pin DTE
5
1
9
8
7
6
Serial Device
9-pin DTE
Figure E-8. Minimum Configuration for 9-pin DTE to 9-pin DTE