PM4/8/12/16 & PM4/8-SA Installation and User Guide v1.1
36
Zone offset applies only to the whole set of zone buttons on a PM, not to individual
zone buttons. Thus the zone buttons can only ever address a numerically-consecutive
subset of the available zones. If an offset is applied which makes one or more buttons
address a zone number higher than the system maximum of 16, the numbers “wrap-
around” back to 1. Thus applying an offset of 13 to a PM4 would result in its four
zone buttons selecting Zones 14, 15, 16 and 1 respectively. It should be evident from
this that zone offsets need not normally be set on a PM16, as all available zones are
individually selectable in any case. Setting an offset on a PM16 simply has the effect of
shifting the numbering of all the zone buttons.
The zone offset applies to both the Digital Paging Interface and the analogue
interface. If the analogue interface is being used to connect the PM to the host mixer,
the access cable connections (see “2. Zone Selection Control Cable:” on page 29)
should be altered to match the zone numbers to be paged, not the button numbers.
Thus in the example given above, the zone select cores of the access cable would be
connected to Z10 to Z13, and not Z1 to Z4.
Setting an Offset
Zone offset is set with internal jumpers J11, J12, J13 & J14. See “PCB layout diagrams”
on page 49 for a diagram showing the jumper locations. The four jumpers are
“binary-weighted”. This means that each jumper corresponds to a different offset
value as follows:
Jumper
Value When ‘ON’
J11
8
J12
4
J13
2
J14
1
Example: to set a PM4 (or PM4-SA) to operate on zones 10-13, the offset value needs
to be 9. To achieve this, jumpers J11 and J14 should be ON, J12 and J13 should be OFF.
(J11=8, J14=1; 8+1=9.)
NOTE
: Setting a zone offset only alters the button/zone relationship for that
microphone. Each microphone in a multi-PM system can operate with its own zone
offset.
