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Understanding the Relay 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 16-Channel Relay
and 16-Channel Thermocouple Relay Multiplexer Modules.
•
Commands for Scanning Switchbox Channels . . . . . . . . . . . page 41
•
Using Scanning Trigger Sources. . . . . . . . . . . . . . . . . . . . . . page 41
•
Using the Scan Complete Bit . . . . . . . . . . . . . . . . . . . . . . . . page 46
Scanning multiplexer channels consists of closing a set of channels, one at a
time. Available for the multiplexers are single, multiple (2 to 32767), or
continuous scanning modes. See
in scanning.
The
command specifies the source to advance the channel list.
TRIG:SOUR
Use the
command to advance the channel list while in the
TRIG
or
BUS
TRIG:SOUR HOLD
Mainframe "Trig Out" port, use the
different trigger sources. The sources are used in other HP VXIbus
mainframes with HP command modules that have "Trig Out" ports.
The examples on the following pages 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 Relay Multiplexer Modules
Modules
Figure 4-1
for the different commands used
trigger state. To enable the HP E1300/E1301
command.
Figure 4-2
OUTP
Chapter 4
TRIG:SOUR
shows the
41
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