10
DSP Connections
The table below lists the pin functions for DSP control signals to the master unit.
Slave units require just a daisy cable link ( standard straight RJ45 male to male
cable required) between master and slave units.
Check that the DSP control signal is
present logic +2.5 to 12 Volts is required.
It is important that the DSP + command signal is
already present before powering the system up.
The logic control signal (pin 1) is an optically isolated input with a dedicated return
connection (pin 2). Voltages as low as 2.5
V DC are recognised as a ‘logic high’ input
which will command the master unit (and any connected slaves) to deploy their
microphones to a pre
set height. A ‘logic low’ (0V DC) will command all units to raise
their microphones to the ceiling.
SK3 Pin No.
Function:
DSP MUTE
FEEDBACK
1
Logic Control Signal Input:
B2.5V DC and +12V DC: Microphones down to set-height.
0V: Microphones up to ceiling bezel switch.
2
GND Return for Logic Control Signal.
Note: This is not a common GND for the unit, it is the return leg of an
optically isolated input.
3
Mute Feedback Signal.
Open collector output that requires a pull-up resistor (10K Ohm) at the DSP
to function correctly.
0V: Microphones not deployed (Mute)
High Impedance (Pulled-Up to voltage): Microphone deployed (Un-Mute)
4
GND Return for Mute Feedback Signal.
Note: This is not a common GND for the unit, it is the return leg of an
optically isolated output.
5
RS485 (+) Communications (Not used on master unit)
6
RS485 (-) Communications (Not used on master unit)
7
RS485 0V (Not used on master unit)
8
Unused
