IEEE-488 Programming
5-36
U7 Digital input
The U7 command (Figure 5-23) requests a decimal value of the inputs at the digital I/O port. In
master/slave configurations, the digital input of the master unit is sent.
Programming notes
1. The instrument transmits the appropriate status word only once each time the corresponding
U command is received.
2. To ensure that correct status is indicated, the status word should be requested immediately
after the command is transmitted. The status sent by the Model 708A is that which is present
at the time it is instructed to talk, not at the time the U command is received.
3. The bits in the U1 error status word latch and remain in that condition until the U1 word is
read.
4. The programmed terminator (default CR LF) is transmitted at the end of each status word.
Also, EOI is transmitted at the end (unless disabled with the K command).
5. If no U command has been received, the PRINT #1, “ENTER 18” and LINE INPUT #2, A$
commands request the letter (x) and number (nn) of the software revision for a stand-alone
unit or the master unit of a master/slave configuration (708Axnn). It is sent with two trailing
spaces plus the terminator and EOI.
5.9.22 V — Make/Break
Purpose
To select rows for make/break operation.
Format
Vabcdefgh
Parameters
abcdefgh= 00000000
All rows de-selected for make/break
to
11111111
All rows selected for make/break
Description
The V command selects individual rows for make/break (make-before-break) operation. A “1”
in the respective row field selects make/break; a “0” de-selects make/break operation.
Identifier
DIN iiiii; < TERM+EOI>
Input (00000-65535)
Figure 5-23
U7 digital input
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Summary of Contents for 708A
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