PRECITEC CHRocodile C, Руководство по эксплуатации

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2.16 TRE Command
Short description:
This command lets the sensor enter a trigger mode where one trigger event will produce one
sample. Trigger signals can be SyncIn or Encoder inputs, depending on $ETR settings, see
$ETR description below. $TRE is particularly useful in conjunction with encoder based trigger
generation as described in the $ETR section below.
The encoder inputs and related commands ETR or ENC are available only with
the analogue converter box accessory.
The maximum frequency (or the shortest interval of two consecutive trigger events) is defined by
the cycle frequency ($SHZ). Trigger events that occur while the sensor is idle will cause an
immediate exposure. If a trigger event occurs during an ongoing acquisition cycle, then the
respective exposure will be delayed until the current cycle is completed. In this case, the
TriggerDelayed – Flag (Bit 2) is set in the flags signal of the delayed exposure. This flags signal
is a global signal (ID = 76) that can be requested just like any other signal using $SODX. If more
than one trigger event occurs during an ongoing exposure cycle, then only the first event will
result in a delayed exposure cycle as described above, all consecutive trigger events will be
ignored. In this case, the TriggerIgnored – Flag (Bit 1) will be set in the flags signal of the
delayed exposure.
Command syntax:
$TRE
Command Description
$TRE
Response: $TRE[CR]ready[CR/LF].
Trigger each
2.17 TRG Command
Short description:
The command TRG is a Wait For Trigger. The command enables an exact alignment of the
sensors sampling intervals with the movement of a scanning axis.
It stops the sensor after completion of the current data telegram and puts it in a waiting state.
This state is left by a trigger event (rising edge on the Sync in, Encoder Trigger).
Command syntax:
$TRG
Command Description
$TRG
Response: $TRG[CR]ready[CR/LF].
Wait For Trigger