The inputs/outputs will sink current (pull low) when active (see the Specifications section of this document
for more details). The desired load (lamp, LED, etc.) must be connected between the input/output
terminal and a positive voltage reference.
It should be noted that external switches and a sounder connected to the first two inputs are typically
mandatory for standards compliance. The location and physical attributes of these items may be required
to conform with local norms.
For each of these inputs/outputs, a load must be connected between each output and the positive voltage
source. If any output on terminals 1 through 8 is unused, the output must be connected through an
external resistor to the positive side of the voltage source (either 10V Out or user-supplied external
source). To ensure correct functionality, the value of each resistor should be 22kΩ. An internally derived
10V source is provided at the 10V Out terminal; however, the total current available from this pin is limited
to 100mA. This voltage source may be used for external devices provided the total load is less than
100mA. For higher-current devices, a user-supplied external voltage source of up to 35V may be used,
with the negative side connected to the pin. Due to monitoring constraints, it is impossible to use both the
internal 10V source and an external source. For monitoring purposes, the positive side of the voltage
source (either 10V Out or user-supplied external source) must be connected to the External Supply Over-
voltage Monitor (terminal 8), as well as supplying voltage to external devices.
Sounder Output/Silence Input
This connection functions as a dual purpose alarm sounder output and silence input.
Sounder Output
This output connects to a local sounder for fault and alarm warnings. A sounder is typically
required for standards compliance. Note: If an emergency microphone is located near the sounder,
it may be configured in Vocia software to mute the sounder while making live announcements.
Silence Input
This input is used to silence the local sounder. The sounder will restart in response to any new
Fault or Alarm.
System Fault Reset Input
This input is required to take the LSI-16/LSI-16e out of System Fault condition. Note: the LSI-16/LSI-16e
will always power up in a system fault state.
Voice Alarm Active
This output is active when messages are playing in response to an alarm input. This output provides
indication of when a message is playing or when a message has been muted.
Constant active output - indicates a message is playing in response to an alarm input.
Cyclic output (1.25Hz) - indicates the message has been muted.
General Fault, PSU Fault, Protection Fault and Path Fault
These outputs will be activated by the same alarm conditions as identically named LEDs on the front
panel. Note however that these outputs will be activated by the faults listed above irrespective of whether
a System Fault has been activated.
The Voice Alarm Active, General Fault, PSU Fault, Protection Fault and Path Fault outputs are monitored
for open-circuit or short-circuit to ground or power supply and for over-voltage on the output pin (>35V
DC). If incorrect conditions are detected a Fault is signaled. Output monitoring facilitates compliance with
voice evacuation standards.
Control Inputs
Two five-position plug-in barrier strip connectors provide control input connections. Eight separate
channels plus two ground pins are provided. Control Inputs are fully isolated from all connections in the
LSI-16/LSI-16e.
