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MACRO range installation manual. Issue 6
Page 12
Priority/passive setting of modules
Certain modules contain features enabling the commissioning engineer to set them to operate as normal priority modules, or as
passive modules. Referring to APPENDIX E, this is accomplished on the M24 microphone input module for example by transposing
the position of a jumper link on the module, from lower middle (position B) to lower left (position A) for the change to passive (non-
priority) mode. In this mode, the module audio signal path is permanently enabled, though it will be inhibited by access of any
higher priority module and is itself rendered unable to inhibit any other module. The jumper link may be changed at any time, and
is a simple push fit.
Priority memory
If, whilst a priority module is being accessed, an attempt is made to trigger a tone generator module which is installed in a lower
priority level, and which features a priority memory, then no apparent action will result until the higher priority is released, at which
time the memory circuit will automatically and immediately trigger the timer circuit of the module, causing it to operate in the
normal manner for its pre-set duration.
PRE-ANNOUNCEMENT CHIMES - all units except slave amplifiers
The customary ding-dong chime signals which can often be heard to precede announcements in public buildings, are generated
in MACRO range equipment by certain standard microphone or line input, and tone generator modules. It is possible therefore to
install two or more such modules, and adjust them so as to be readily distinguishable. The chime is triggered only on successful
access to the priority chain. See APPENDIX E for location of adjustments.
MIXER FACILITY CONNECTIONS - 0dB SIGNAL ACCESS POINT
This connection may be used to gain access to the output of the pre-amplifier section, or the input of the power amplifier section,
at 0dBV level. Standard connection is by Locking 5 pin DIN panel socket with 180 degree pin spacing pattern. Connections are as
follows:
0dB signal in/out access for mixers & mixer amplifiers -
The standard Locking DIN pin connections are as follows:-
Pin 1 Pre master gain control direct from TB.6 module
Pin 2 Signal earth (cable audio shield)
Pin 3 Post master gain control (via 10k source)
With the master control at position 0 the loading effect exhibited by pin 3 is
approximately 6k8 ohms. For further clarification of this arrangement see the
block schematic diagram - APPENDIX A
Input connections for slave amplifier
The standard input circuit is suitable for unbalanced line operation, and the locking
DIN signal input connections are:-
Pin 1 No connection
Pin 2 signal earth (cable braiding)
Pin 3 .775v @ 10k ohms power amplifier input
Fig. 4 Mixer facility connections for standard locking DIN connector
Fig. 5 Mixer facility connector pin
identification
SOLDER CUPS VIEWED
FROM INSIDE THE PLUG
BODY
5 PIN DIN STANDARD
CONNECTOR