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Example: Scanning With
External Devices
44 Understanding the Relay Multiplexer Modules
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This example uses the mainframe "Trig Out" port to synchronize the
multiplexers to an HP 3457A Digital Multimeter. See the following figure
for typical connections. For this example, use the trigger output pulse of the
mainframe "Trig Out" port to trigger the multimeter via its External Trigger
port. The sequence of operation is:
1.
INIT
(line 70) closes channel number 100.
2. The channel closure causes a trigger output from the "Trig Out" port.
3. The trigger causes the multimeter to make a measurement.
4. Measurement result is sent to the computer (lines 80 to 100).
5.
(line 110) advances the channel list to the next channel.
TRIGGER
6. Steps 2-5 are repeated for channels 101 through 115.
10 OUTPUT 722;"TRIG EXT;DCV"
20 OUTPUT 70914;"OUTP ON"
30 OUTPUT 70914;"TRIG:SOUR BUS"
40 OUTPUT 70914;"SCAN:MODE VOLT" !Sets switchbox to measure
50 OUTPUT 70914;"SCAN:PORT ABUS" !Closes the AT and AT2 Tree
60 OUTPUT 70914;"SCAN (@100:115)"
70 OUTPUT 70914;"INIT"
80 FOR I=1 TO 16
90 ENTER 722;A
100 PRINT A
110 TRIGGER 70914
120 NEXT I
130 END
!Sets multimeter to external
trigger and to measure dc volts.
!Enables "Trig Out" port.
!Sets switchbox to receive Bus
triggers.
voltage.
Switches.
!Selects the channel list for
scanning.
!Starts scanning cycle.
!Start count loop.
!Enter reading into variable A.
!Print reading in variable A.
!Trigger the switchbox to
advance the channel list.
!Increment count.
Chapter 4
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