Appendix E
Interfacing to a Serial Device
© National Instruments Corp.
E-5 GPIB-232CT-A for MS-DOS/Windows
1
5
6
7
8
9
GPIB-232CT-A
9-pin DTE
Serial Device
25-pin DCE
1
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Figure E-3. Cable Configuration for 9-pin DTE to 25-pin DCE with
Handshaking
Interfacing the GPIB-232CT-A to a DCE without
Handshaking
If your serial device does not require or use the hardware handshaking
protocol used by the GPIB-232CT-A, you have two options:
•
Use a minimum configuration cable which does not support hardware
handshaking and use XON/XOFF software handshaking (if necessary).
To create a minimum configuration cable, connect the signals shown in
bold italics in Table E-2.
•
Wire a custom cable that properly interfaces the GPIB-232CT-A
hardware handshaking protocol to the handshaking protocol of your
serial device.