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J.3 Digital Cameras
External Sensors J
Certain digital cameras can be controlled through an RS232 port. A
message can be sent to the camera to trigger the taking of a
photograph, and the camera may respond with a message that can be
used subsequently to identify the photographic image that was
recorded by the camera.
A hypothetical camera communicates at 9600 baud with 8 data bits,
1 stop bit and odd parity. It is triggered either by pressing a button on
the camera itself or by sending the ASCII character ‘*’ to the camera.
When the camera is mounted on a vehicle it is typically easier to
trigger the camera with an RS232 message. Each time the camera
takes a photograph (whether triggered manually or with an RS232
message), it stores the digital image to its internal memory and emits
the following message to its RS232 port:
$PIC,nn
CR
LF
where nn indicates the number of the stored image (1 to 64).
TSC1 Asset Surveyor Operation Manual 411