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SYSTEM TIMING
It is sometimes necessary to determine the time required for a sequence of programming codes to be
implemented by the HP 8340B/41B. This can be accomplished by the computer's set-time and read¬
time commands:
100
set-time command (computer specific)
20 0
OUTPUT 719; "...(programming codes)..."
30 0
C = read-time command (computer specific)
310
PRINT "TIME REQUIRED";C
For example, the clock commands for the HP 9826/9836 (926/936) computers are:
100
SET TIME 0
300
Clock = TIMEDATE MOD 86400
310
PRINT "TIME REQUIRED"; Clock
For the HP-80 series computers the commands are:
100
SETTIME 0,0
o
■
300
C = TIME
310
PRINT "TIME REQUIRED";C
Other computers use similar commands.
HP-IB PROGRAMMING TECHNIQUES FOR SPECIAL APPLICATIONS
Although the preceding programming codes are sufficient for most applications, it is possible to
program the HP 8340B/41B at a fundamental level by directly manipulating signals on the HP-IB lines.
The following material presents an introductory explanation of these specialized procedures, first by
briefly explaining the HP-IB signal lines, followed by the computer codes necessary for direct control
of the HP-IB lines.
HP-IB PIN-OUT DESCRIPTION
Figure 3-25 shows a detailed view of the HP-IB connector, with a pin-out description. Notice that HP-
IB has 16 dynamic TTL-level signal lines which can be categorized into three groups: data lines,
handshake lines, and system control lines. The signal level on these lines is either TTL low (a "True''
condition), TTL high (a "False" condition), or floating (electrically disconnected).
3-82
Operating Information
HP 8340B/41B
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