272 | Product Options
Aprisa SRx User Manual 1.3.0
Hardware Manual Lock
The Hardware Manual Lock switch on the Protection Switch provides a manual override of the active /
standby radio.
When this lock is activated, the selected radio (A or B) becomes the active radio regardless of the
Software Manual Lock and the current switching or block criteria.
When the lock is deactivated (set to the Auto position), the protection will become automatic and
switching will be governed by normal switching and blocking criteria.
The state of the switch is indicated by the three LEDs on the Protection Switch:
A LED
B LED
Locked LED
State
Green
Off
Off
Auto - Radio A is active
Off
Green
Off
Auto - Radio B is active
Green
Off
Orange
Manual Lock to radio A
Off
Green
Orange
Manual Lock to radio B
The Protection Switch also has a Software Manual Lock. The Hardware Manual Lock takes precedence over
Software Manual Lock if both diagnostic functions are activated i.e. if the Software Manual Lock is set to
‘Primary’ and the Hardware Manual Lock set to ‘Secondary’, the system will set the Secondary radio to
Active.
When a Hardware Manual Lock is deactivated (set to the Auto position), the Software Manual Lock is re-
evaluated and locks set appropriately.
Remote Control
The switch-over to the standby radio can be initiated via the Remote Control connector on the front of the
Protection Switch. This control will only operate if the Hardware Manual Lock switch is set to the Auto
position.
The inputs are logic inputs with 4700 Ω pullup to +3.3 VDC. They require a pull down to ground to activate
the control. The ground potential is available on the connector (see ‘Protection Switch Remote Control
Connections’ on page 298).
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