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Understanding the HP E1346A Multiplexer
Using This Chapter
Commands for Scanning Switchbox Channels
Using Scanning Trigger Sources
Scanning with
External
Instruments
Chapter 4
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This chapter explains techniques to scan the channels of the 48-Channel
Single Ended Relay Multiplexer Module. This chapter contains the
following sections:
•
Commands for Scanning Switchbox Channels . . . . . . . . . . . Page 33
•
Using Scanning Trigger Sources . . . . . . . . . . . . . . . . . . . . . . Page 33
•
Using the Scan Complete Bit. . . . . . . . . . . . . . . . . . . . . . . . . Page 38
Scanning multiplexer channels consists of sequentially closing a set of
channels. Available for the multiplexers are single, multiple (2 to 32767),
or continuous scanning modes. See Figure 4-1 for the scanning commands.
The TRIG:SOUR command specifies the source to advance the channel list.
Use the TRIG command to advance the channel list while in the
TRIG:SOUR BUS or TRIG:SOUR HOLD trigger source. To enable the
HP E1300/E1301 Mainframe "Trig Out" port, use the OUTP command.
Figure 4-2 shows the trigger sources. The sources are also used in other HP
VXIbus mainframes with HP command modules that have "Trig Out" ports.
The examples on pages 4-4 and 4-5 show different ways to scan channels of
a switchbox in an HP E1300/E1301 Mainframe. The operation is similar to
other HP VXIbus mainframes with HP command modules that have "Trig
Out" and "Event In" ports.
The computer used in the examples is an HP Series 200/300 used with HP
BASIC as the program language. The computer interfaces with the
mainframe over HP-IB. Assumed is an:
•
HP-IB select code of 7
•
HP-IB primary address of 09 for the HP E1300/E1301 Mainframe
•
HP-IB primary address of 22 for the HP 3457A Multimeter
•
HP-IB secondary address of 14 for the multiplexer module
Understanding the HP E1346A Multiplexer
Chapter 4
33
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