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The digitizer hardware associated with arming the digitizer is controlled by
the SCPI ARM subsystem. The commands in this subsystem include:
ARM
[:STARt|SEQuence[1]]
:COUNt <
count
>
:DELay <
period
>
[:IMMediate]
:LEVel[<
chan
>]
:NEGative <
voltage
>
:POSitive <
voltage
>
:SLOPe[<
n
>] <
edge
>
:SOURce[<
n
>] <
source
>
Note Each command in this subsystem is covered in detail in Chapter 4 -
"Command Reference".
ARM Subsystem
Overview
The following information summarizes each command in the ARM
subsystem.
Setting the Arm Source The arm source specifies the signal(s) which arms the digitizer. The source
is specified with the command:
ARM[:STARt]:SOURce[<
n
>] <
source
>
Up to two arm sources ([<n >] = 1|2) can be specified. ARM:SOUR1
specifies the first source. ARM:SOUR2 specifies the second source. The
first event to occur on either source arms the digitizer. The digitizer arm
source(s) can be selected from the following:
• BUS - HP-IB Group Execute Trigger (GET) commmand or the
*TRG common command.
• ECLTrg0/ECLTrg1 - the VXIbus ECLTrg0 or ECLTrg1 trigger lines.
• TTLTrg<n > - the VXIbus TTLTrg0 through TTLTrg7 trigger lines.
• EXTernal1 - the "Ext 1" BNC input port.
• INTernal1 - arms when the signal level on channel 1 meets the
conditions specified by ARM:LEVel1.
• INTernal2 - arms when the signal level on channel 2 meets the
conditions specified by ARM:LEVel2.
114 Understandin
g
the HP E1429 Di
g
itizer Chapter 3