Instruction manual

4.2.5 Initial Channel Select (ICS) or Auto Latch Tracking
S4 provides the user with a method to force the Auto Latch to follow the remote or manual inputs. This feature
eliminates unnecessary switching when moving between either Manual or Remote operation back to Auto
operation. The Remote and Manual logic signal are routed to inputs on the Auto Latch that cause it to "track"
the RF switch state. This feature can be enabled or disabled by opening or closing the switches on S4.
Normally S4-1 and S4-2 would be both open (disabled) or both closed (enabled) to cause the Auto Latch to
track the Manual switch control. Additionally, S4-3 and S4-4 would both be open (disabled) or both be closed
(enabled) to cause the Auto Latch to track the Remote control operation.
4.2.6 Reset Operation
Remote Reset and Manual Reset are combined by U7C and then inverted by U8C. This reset signal is used to
reset the Auto Latch (See Restore "CH1" on Reset) and to reset the remote control latches (See Remote
Operation).
4.2.7 Alarm History Reset
The Alarm history is maintained by U2A (Alarm "1") and U2B (Alarm "2"). Any momentary alarm condition
will be latched by this circuitry providing an alarm history indication. These alarm history indicators will
remain illuminated, once latched, until the alarm history reset is actuated. It should be noted that the "Ignore B
Alarm" configuration has no affect on the "CH2" alarm history indicator.
4.2.8 Power Indicators
Power indicators DS9 and DS10 are provided to show the presence of DC power.
1582-70L Manual, Rev. B Page 14 11/05/09