Instruction manual

4.2.2 "CH1" As Primary Source Operation (JP1 2-3 and JP3 2-3)
With the jumpers in this configuration the Auto Latch will always select "CH1" unless "CH1" is alarmed and
"CH2" is not alarmed. This is accomplished by grounding the reset on the Auto Latch via JP1 and JP3.
4.2.3 Restore "CH1" On Reset (JP1 2-3 and JP3 1-2)
This configuration will cause the switch to remain in the "Select CH2" state, after an "CH1" is alarmed and
"CH2" is not alarmed condition occurs, until a remote or manual reset is actuated. This is accomplished by
tying the Auto Latch reset to the internal reset logic of the switch via JP1 and JP3.
4.2.4 Remote Operation
Remote "CH1" and Remote "CH2" inputs are used for control of the switch from a remote location.
These inputs will override the Auto Latch and therefore any switching that is a result of alarm conditions.
The remote inputs will not override Manual operation.
The remote inputs are latched by U4C and U5A (Remote "A") and U4D and U5B (Remote "CH2"). These
latches allow the remote operation of the switch using a momentary contact closure to ground. A momentary
closure on the Remote "CH1" input will set the latch causing a logic Low to be present on U5 pin 12. This low
is applied to pin 2 on U7 forcing its output high (U7 pin 12). U1 pin 10 is high, inverting the output on U7 pin
12 causing a logic low to appear on U1 pin 8. A logic low at this point equal "Select CH1". A momentary
closure on the Remote "CH2" input will set the latch causing a logic Low to be present on U5 pin 6. This low
is applied to pin 13 on U7 forcing its output high (U7 pin 12). The logic Low from U5 pin 6 is also applied to
U1 pin 10 pin which cause the XOR gate to not invert the output on U7 pin 12 causing a logic high to appear on
U1 pin 8. A logic high at this point equal "Select CH2". A momentary contact closure to the remote reset or a
manual reset will reset both latches restoring the RF switch to Auto operation. If either remote latch is set U8
pin 6 will be high. If the Manual switch is in the Auto position, U8 pin 8 will also be at a logic high. In this
condition U8 pin 8 will be low causing a remote LED indication as well as providing a remote open collector
output on Q2.
4.2.5 Manual Operation
The Manual switch on the front of the RF switch provides local control of the RF switch. The Manual
operation overrides Auto and Remote operation of the switch. When the Manual switch is in the Auto position,
U1C and U7B have no affect on the logic level from the auto and remote circuitry. When the Auto switch is in
the "Select CH1" position, U7 pin 4 is forced low causing U7 pin 6 to a logic high. Because U1 pin 13 is high,
U1D inverts the logic high on U7 pin 6 cause a logic low to appear at U1 pin 11. A logic low at this point
equals "Select CH1". When the Auto switch is in the "Select CH2" position, U7 pin 5 is forced low causing U7
pin 6 to a logic high. Because U1 pin 13 is also forced low, U1D does not invert the logic high on U7 pin 6
causing a logic high to appear at U1 pin 11. A logic high at this point equals "Select CH2". If either Manual
position is selected, either pin 1 or pin 2 on U8 is forced low causing U8 pin 3 to be forced high. The logic high
on U8 pin 3 will provide a Manual LED indication as well as a Manual open collector output on Q1.
1582-70L Manual, Rev. B Page 13 11/05/09