Reset Conditions - Agilent Technologies E1476A User Manual

Reset Conditions

Chapter 3
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This section describes the power-on and reset condition the E1476A
multiplexer module is in when a "scanning voltmeter" reset occurs. The
"VOLTMTR" device driver controls both the voltmeter and any switch
module configured with it in a scanning voltmeter configuration.
At power-on or following the reset of a scanning voltmeter ( 567 command
sent to the voltmeter address), all 64 channels and all tree relays are open.
In addition, after a 567 command, the current scan channel list is
invalidated. See the E1326/E1411 User's Manual for the reset conditions
of the multimeter.
Table 3-2 lists the parameters and default values for the multiplexer module
functions following power-on or reset. These are not accessible to you via
the "VOLTMTR" driver, but are provided so you will know the multiplexer
module condition after power-on or following a reset.
Table 3-2. E1476A Default Conditions for Power-on and Reset
Parameter
$50 &281W
75,*JHU 6285FH
,1,7LDWH &217LQXRXV
2873XW> 67$7H@
>5287H @6&$1 02'(
>5287H @6&$1 3257
Channel state
Tree relay state
Channel list from 6&$1
command (after 567)
Default Description
1 Number of scanning cycles is one.
IMM Advances through a scanning list
automatically.
OFF Number of scanning cycles is set
by $50 &281W
OFF Trigger output from EXT, TTL, or
ECL sources is disabled.
NONE Channel list is set for volts
measurement.
NONE Analog bus connections are
disabled from channels.
All 64 channels are open (channels 00 - 63)
All tree relays are open (channels 90 - 94)
Current channel list is invalidated following a
reset of the module with 567 command.
Scanning Voltmeter Applications 59