RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 59
4.2.5: Exposure:Trigger Modes
Set Trigger Exposure Time
The trigger run exposure time is set in incre-
ments of the TPD Period. This unit of time is called
the Transfer Pulse Delay (TPD).
Two commands are provided for calculating the
triggered exposure time from a specified time varia-
ble (milliseconds or microseconds). The closest
available time is selected and set in the internal time
variable. The maximum triggered time is dependent
on the pixel clock speed. The millisecond variable is
set as ms*100 to give more resolution to the com-
mand. This results in a maximum possible exposure
of 65535 TPD units.
Serial Commands
Target
Index
Command
R/W
Description
02
00
Set Trigger ms
W
Set TR time in milliseconds * 100
02
01
Set Trigger us
W
Set TR time in us
02
00
Get Trigger ms
R
Return actual time in milliseconds * 100
02
01
Get Trigger us
R
Return actual time in us (0xFFFF = to large).
02
0E
TPD resolution
R/W
0x0000 = 4 clock periods
0x0001 = 16 clock periods
0x0002 = 64 clock periods
0x0003 = 1024 clock periods
Quick FAQ’s:
►
The strobe signal can be found on the RMV power
connector and is a 3.3V LVTTL signal.
►
Minimum exposure time is set by the physics of the
photodiode transfer to vertical CCD clock
sequence. The electronics can be set for any
exposure downto zero.
►
Maximum exposure time is set by the TPD period
and the maximum TPD register value (65535).
4.2.6: Exposure:Trigger Modes
Software Controlled Trigger
This command forces an internal trigger from a
software command. The soft trigger pulse has a
width in us as specified in the data field. The range
is 1 to 65535 ms (65sec). The timing is approximate
due to the inaccuracies in the microprocessor time
function. The exposure time is set with the TDP reg-
ister in TPE mode. The set trigger high/low can be
used to create an arbitrary long exposure. The soft-
ware trigger is logically OR’d with the CL hardware
trigger so you must disable the hardware trigger on
your capture card for this to function correctly.
Serial Commands
Target
Index
Command
R/W
Description
02
05
Soft Trigger
W
Issue a soft trigger with width in ms
02
06
Soft Trigger high
W
Sets trigger high
02
07
Soft Trigger low
W
Sets trigger low
Quick FAQ’s:
►
Minimum exposure time is set by the photodiode
transfer to vertical CCD clock sequence.
►
Maximum exposure time is set by the maximum
register value (65535).
►
Use an initlizing software trigger to reset the
camera.
►
NOTE: Beware of timeout conditions when using
long exposures !
►
NOTE: The trigger input must be set to CL for the
software trigger to work !
