Slave Mode; Exposure Control; Figure 6 Slave Mode Timing (Lvds Model) - PerkinElmer RETICON LD3500 Series Instruction Manual

these line periods. For proper master mode operation, LR must be held in a High
state or left unconnected.

4.2.4 Slave Mode

The slave mode allows the synchronization of the camera operation with a user
controlled exposure period. When operating in the slave mode, the user must
supply an LT (Line Transfer) input and an LR (Line Reset) input.

4.2.4.1 Exposure Control

Slave mode camera exposure is determined by the LR and LT signals which must
be timed with MCLK. The exposure time is defined as either (a) the time between
successive falling edges of the LT signal or (b) the time when the LT signal is
held high. To select the exposure control mode described in (a), the user must
hold LR in a high (ON) state or leave these pins unconnected. To select the
exposure control mode described in (b), the user must hold the LR signal in a low
(OFF) state. In case (b), the LT signal must be held active high (ON) for a
minimum of 2 clock cycles and must be inactive high (OFF) for a minimum of 6
clock cycles. Because there are extra stages in the CCD readout register there
must be at least N+76 clock cycles between successive LT commands.

Figure 6 Slave Mode Timing (LVDS Model)

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