ALARM-24 Series User Manual P/N 821542 Rev-A
12
© 2003 Wohler Technologies Inc. ALL rights reserved
B
Please refer to Figure-2b on the following page to familiarize yourself with the rear panel features of the ALARM-24 Series units.
The following sections describe these features and are referenced, by letter, to Figure-2b.
Rear Panel Features
Section 2: Operation
(Continued)
A
A1
A2
Digital (AES) Audio Input Connectors
(ALARM-24Dx/x Only)
Each input connector receives an AES digital signal from which two channels are derived.
Phoenix Connectors (Standard)
These Phoenix (or XLR) connectors are configured for a balanced (110 Ω impedance) connection. Channel numbers
are displayed on a label to the side of each connector and correspond to the channel numbers above the associated LED
indicators on the front panel. Connector pinout information is silk-screened just below each connector.
BNC Connectors (Optional)
These BNC connectors are configured for an unbalanced (75 Ω impedance) connection. Channel numbers displayed
on a label above or below each connector and correspond to the channel numbers above the associated LED indicators
on the front panel.
Input Termination DIP Switch
(ALARM-24Dx/x Only)
This DIP switch sets the Termination for the input connectors. Each DIP switch module affects only the four channels (two
input connectors) within the section in which it is located. See below for setting information.
Switch sections 1 (left connector) and 6 (right connector) respectively set the termination for the connector inputs in each 4-
channel input section. The respective DIP switch section should be moved to the UP position to UNTERMINATE the
connector if the input signal is fed to downstream equipment. The respective DIP switch section should be moved to the
DOWN position to TERMINATE the connector if the input signal is not fed to downstream equipment. The factory default
setting is TERMINATED for each input connector. See diagam below for settings.
Term
Unterm
Term
Unterm
1234
5
6
Left Side Input Termination
1
21
5
4
36
6
ALARM-24 Termination DIP Switch Settings
x
x
xx xx
xx
6
1
Note: Positions 2, 3, 4, & 5 of DIP switch are not functional
Right Side Input Termination
C
D
Analog Audio Input Connectors
(ALARM-24Ax/P Only)
The Analog units have balanced (>10K Ω impedance) inputs terminated in 6-pin "mini" Phoenix connectors. There are
two signals; one signal to the left three pins (CH A) and the second signal to the right three pins (CH B). There are two input
connectors per input section (4 channels). Channel numbers are displayed on a label to the side of each connector and
correspond to the channel numbers above the associated bargraph meters on the front panel. Pin-out information is silk-
screened on the rear panel directly below each connector.
DIP Switch Module
(ALARM-24Ax/x Only)
This DIP switch is not functional in the ALARM-24Ax/x Series models.
(26 pages)
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