90074225 MOPS-Q QTH Lamp Pow er Supplies
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11.4 TTL SIGNAL POLARITY
Figure 23 Shutter Output Connector.
The settings of the OPS-Q Model Power Supply can be adjusted to output both positively and negatively
biased TTL pulses depending on the requirements of the external shutter being used. To adjust this TTL
signal output polarity, access the System 1 setup menu as shown below:
Press the vertical menu button next to the Shutter indicator. W hen a red bullet appears next to the
current Shutter setting, use the knob to adjust to Pos or Neg as required by the external shutter.
Be aware that selecting the wrong TTL polarity as required for the shutter will cause the shutter status
indicators described in
11.1 Shutter Status
to indicate the wrong open/closed status. Damage to the
external shutter may occur as well from inputting opposite polarity TTL signals than the shut ter was
designed for.