Operating instructions

Operation and Features, cont’d
VoiceLift
™
Microphone • Operation and Features
2-14
PRELIMINARY
c
DIP switches
• Mix switch — Selects the output mode of the receiver.
m When the switch is set to Off (down), the receiver outputs
microphone and auxiliary input audio on separate pins. (See the
Output port pinout illustration and table, on the previous page.)
This is the default state for the Mix switch.
m When the switch is set to On (up), the microphone audio is mixed
with the auxiliary input audio. The receiver then sends mixed
output on the microphone line to the PoleVault switcher.
N
Do not set the Mix switch to On unless there is an input source
connected to the Aux input jack. Noise may be injected into the
system if no source is connected when the Mix switch is enabled.
• Tone switch — Enables and disables the tone generated when the
microphone volume changes. As the microphone volume increases, the
level of the tone increases also. The default state for this switch is On.
d
RS-232 configuration port — This port allows firmware upgrades and gain
adjustments to be performed via SIS
™
(Simple Instruction Set) commands. An
IP Link device can be connected to this port to monitor the receiver’s status.
The protocol for this port is:
• 38,400 baud • no parity
• 8 data bits • no ow control
• 1 stop bit
e
Auxiliary input (Aux In) port — Connect a mono auxiliary input device, such
as an intercom, to this three-pole captive screw connector.
For example, this port can be connected to an IPI Intercom for an instant alert
application; in this configuration, the Mix DIP switch is set to on to mix the
microphone audio when a message is streamed from a help desk.
f
Contact Input (CTC) port — Connect this two-pole captive screw connector
to a contact closure device such as a push-button or motion sensor.
g
Relay (Rly) port — This relay port allows control of items such as lighting. If
connected to a Digital I/O port of an MLC control panel, this port can be used
to set up an instant alert (see chapter 4, “Special Applications”).
The default state for this Relay port is normally open. The relay is triggered
by holding down both parts of the Volume rocker button simultaneously for
2 seconds. When the relay is closed, the LED in the center of the receiver
dome ashes, alternating between amber and green. The relay returns to the
open state when the Volume button is released. The contact rating for this
port is 24 V, 1 A.
N
The microphone must be on channel(s) A and/or B for the Volume buttons to
trigger the relay.
h
Tab with arrow — This tab contains an arrow etched into the side of the
dome. To attach the dome to the housing, align this arrow with the raised
arrow on the rim of the housing, then rotate the dome clockwise. (See
“Removing and replacing the receiver dome”, later in this chapter.)