Section 4 – Multiplex Polling Loop
4–3
system log and the keypad will display “SYSTEM NOT READY Zn #”, “CHK LOG & RESET!
MPX ZONE ERRORS”, or “SYSTEM NOT READY SUPERVIS ZN #”. If extra zones exist
that have not been defined in programming, then the keypad will display “CHK LOG &
RESET”, “MPX ZONES ERRORS” and the event log will reflect “Extra Zone Zn#”. All zones
must be enabled in programming even if not used.
Whenever additional points are added to the multiplex bus it is necessary to define the zones to
the desired attributes within the programming sequence.
Zone Definition
The multiplex points must be defined within the programming sequence to contain the
desired attributes. Consult the LCD Keypad Programming Guide or the EZ-Mate PC
Downloader for more details.
Configurations
Any of the multiplex point accessory devices can be used, in any combination, to obtain up to
64 points on the multiplex bus. The polling loop can be run in a variety of configurations as
shown in the diagrams below. The configuration should be selected to suit the particulars of
each installation, however the polarity of the system must be maintained throughout the
loop. If the polarity of the loop is reversed at any point an alarm conditions will be generated.
The individual multiplex points must be wired in parallel to the two-wire polling loop,
making sure that no more than the maximum allowable wire length is used per loop run as
follows:
NON-SHIELDED
SHIELDED
#22 gauge
@650' maximum
@325' maximum
#20 gauge
@950' maximum
@475' maximum
#18 gauge
@1500' maximum
@750' maximum
#16 gauge
@2400' maximum
@1200' maximum
Twisted pair is recommended for all normal wire runs.
IMPORTANT: The maximum combined polling loop run is 4000'. If using shielded wire, the
maximum is 2000’. If longer runs are needed, the Multiplex loop Extender Module must be used.
POLLING LOOP
(BREAK OFF AT
ANY POINT IN
THE LOOP)
POLLING LOOP
POLLING LOOP
(STAR)
