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Scanning a Switchbox with a Downloaded Scan List
This example shows a FET switchbox connected to multimeter with the
analog bus cable and the digital bus cable. The switchbox and multimeter
are separate VXIbus instruments. The multimeter has a secondary address
of 03, and the switchbox has a secondary address of 04. The triggering is
through the digital bus handshake lines, so the scan list is downloaded. The
following program illustrates the procedures:
10 DIM Rdgs(1:16) !Dimension array to store readings
20 OUTPUT 70903,"*RST,*OPC?" !Clear the multimeter; *OPC?
ensures reset is completed before
program continues
30 ENTER 70903;A
40 OUTPUT 70903;"*CLS"
50 OUTPUT 70904;"*RST" !Reset multiplexer
60 OUTPUT 70904;"*CLS"
70 OUTPUT 70903;"CONF:VOLT:DC 58.1"!Configure the multimeter
80 OUTPUT 70903;"TRIG:SOUR EXT" !External trigger source
90 OUTPUT 70903;"TRIG:COUN 16" !Set for 16 triggers
100 OUTPUT 70903;"INIT" !Initialize multimeter, wait for
trigger
110 OUTPUT 70904;"STAT:OPER:ENAB 256"
!Enable operation complete bit
120 OUTPUT 70904;"TRIG:SOUR DBUS"!Digital bus triggers
130 OUTPUT 70904;"SCAN:MODE VOLT"!Configure for voltage
140 OUTPUT 70904;"SCAN:PORT ABUS"!Enables analog bus
150 OUTPUT 70904;"SETT:TIME MAX,(@100)"
!Delay for signal to settle before
multiplexer enables channel closed
pulse
160 OUTPUT 70904;"SCAN (@100:131)"!Enter scan list
170 OUTPUT 70904;"INIT" !Close first channel
180 OUTPUT 70903;"FETC?" !Multimeter retrieves readings
from mainframe memory when
scan completes
190 ENTER 70903;Rdgs(*) !Put readings in array
200 PRINT Rdgs(*) !Print
210 END
Chapter 3 Using the HP E1351A/53A FET Multiplexer Modules 41