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