Uvitron International SUNRAY 400SM Instruction Manual, Rev. H
Page 14 of 23
EXTERNAL INTERFACE (CONTINUED)
7
7.2 Interface Signal Descriptions
The
Standby Power H signal
can be used to externally control the SunRay lamp
intensity. This signal can be used to either simply switch between full power and half
power as the unit’s front panel switch does, or the signal can be pulse width modulated
to linearly vary lamp intensity between full and half power (see Fig. 6 below). When the
signal at pin 5 is open (high), the lamp intensity will be set to the minimum standby
power level. When the signal is shorted to the Standby Power Return at pin 13, the
lamp intensity will be set to the full power level.
NOTE:
B
ecause this signal is internally connected in parallel with unit’s front
panel lamp power switch, the front panel switch must be set to the standby
position in order for the external signal state of pin 5 to take effect.
Fig. 6, Effect of PWM of Standby signal on lamp intensity
