Racal Instruments 1256 Manual page 165

1256 User Manual
Advanced SCPI Operations 8-10
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are executed, the 1256 will accept up to 3 triggers. After the third
trigger, scanning will be disabled since the trigger count value has
been reached. At this point, channel 2 from module 1 will be
closed, because it is the third element in the scan list.
Now if a second INIT:IMMEDIATE command is received, the 1256
will accept up to 3 more triggers. The first trigger received will open
channel 2, and close channel 3.
The INIT:CONTINUOUS command also arms the 1256. This
command allows the 1256 to continuously scan through the
channels in the scan list. The 1256 will NOT stop scanning after
the number of triggers equal to the trigger count have been
received. This command effectively bypasses the trigger count
limit.
The ABORT command disarms the 1256. Once the 1256 receives
the ABOR or ABORT command, it will not perform any scan list
actions until it is rearmed by using the INIT:IMMEDIATE or
INIT:CONTINUOUS commands.
At power-up, and after executing a *RST command, the 1256 is
disarmed.
The trigger and arm state diagram is shown in Figure 8-1. This
diagram shows that the 1256 must be armed before it responds to
triggers. Once it is armed, it remains armed and sequences
through the scan list until the number of triggers equal to the
trigger count is received. After that, it is disarmed and must be
rearmed again. The 1256 may also be manually disarmed with the
ABORT command.
Publication No. 980855 Rev. A
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