REDLAKE MASD, INC.
4.5 Control Inputs
The control input EXPOSE is provided as a means of externally controlling the exposure of the
camera. This input is designed to accept RS-422 differential or, for backwards compatibility,
single ended TTL. To drive this input differentially connect both the (+) and (-) inputs to an
RS-422 driver. When the (+) input is more positive than the (-) input the camera is exposing.
When the (+) input is more negative than the (-) input the camera performs a frame transfer and
then idles.
To drive the EXPOSE input with a single ended TTL signal source, connect one input to a TTL
driver and leave the other input floating. If the (+) input (pin 30) is driven then a TTL high will start
an exposure or if the (-) input (pin 64) is driven then a TTL low will start an exposure.
4.6 Mode Control Lines
The operating mode of the camera is set by the MDE command. Issuing an MDE PI command
will delegate mode control to the MC0-MC2 mode control lines. MC0, MC1, and MC2 provide
backward compatibility with earlier
Mega
Plus Camera control signals. Each of these inputs is
designed to accept TTL level signals referenced to ground at the connector. MC0 and MC1 set
the operating mode and MC2 enables the shutter. The truth table for the control lines is as
follows:
Table 4-1. Mode Control Lines
MC2 (Pin 33)
TTL Input
MC1 (Pin 32)
TTL Input
MC0 (Pin 31)
TTL Input
Shutter
Operation
Operating
Mode
Low (0 volts)
Low (0 volts)
Low (0 volts)
Enabled
Controlled
Low (0 volts)
Low (0 volts)
High (+5 volts)
Enabled
Triggered
Low (0 volts)
High (+5 volts)
Low (0 volts)
Enabled
Continuous
Low (0 volts)
High (+5 volts)
High (+5 volts)
Enabled
Continuous
High (+5 volts) Low (0 volts)
Low (0 volts)
Off, blades open
Controlled
High (+5 volts) Low (0 volts)
High (+5 volts)
Off, blades open
Triggered
High (+5 volts) High (+5 volts)
Low (0 volts)
Off, blades open
Continuous
High (+5 volts) High (+5 volts)
High (+5 volts)
Off, blades open
Continuous
NOTE
: Redlake, MASD, Inc. does not recommend using MC0 through MC2 for mode control in
new designs for
Mega
Plus cameras. The serial data port, with its complete command
set, provides a more useful control interface.
91000050-002 Revision A
4-2
10/01/01
Summary of Contents for 1.4i
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