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Appendix B
Interfacing to a Serial Device
B-4
www.ni.com
Figure B-2 shows a properly configured 9-pin DTE to 9-pin DCE cable
including the hardware handshake lines RTS, CTS, and DTR. With this
configuration, the GPIB-232CV-A can function properly (handshake) on
buffer full conditions. Figure B-3 shows an equivalent 9-pin DTE to 25-pin
DCE cable configuration.
Figure B-2.
Cable Configuration for 9-pin DTE to 9-pin DCE with Handshaking
Figure B-3.
Cable Configuration for 9-pin DTE to 25-pin DCE with Handshaking
Interfacing the GPIB-232CV-A to a DCE without Handshaking
If your serial device does not require or use the hardware handshaking
protocol used by the GPIB-232CV-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 B-2.
1
5
6
7
8
9
GPIB-232CV-A
9-pin DTE
5
1
9
8
7
6
Serial Device
9-pin DCE
GPIB-232CV-A
9-pin DTE
Serial Device
25-pin DCE
1
5
1
6
7
8
9
14
15
16
17
18
19
20
21
22
23
24
25
8
9
10
11
12
13