Installation manual

The PX-700 must be very well ventilated. Be sure to provide for this when
installing each unit and in designing of any cabinetry for the Installation.
Provide ample space for air circulation and flow-through ventilation around
all the other electronics too, especially amplifiers. Allow room for growth of
the system.
Whenever possible, allow for access to the back of the equipment. This can
be accomplished with pullout cabinets, pullout shelves, or through an
adjoining room or crawl space behind the cabinet.
Request at least a 20 amp, dedicated circuit for the Installation. Consult the
specified current requirements for the equipment and determine the maxi-
mum potential current draw. Review this information with the electrician or
engineer on the job to determine the requirement for your circuit.
Connecting the
PX-700s
RS-485 Bus ➤ The PX-700s communicate with each other via the RS-485 bus. Use one
or more KPT Keypad Termination Boards for each PX-700, depending on
the total number of keypads and other Audioaccess equipment in the
System. Once all the equipment is terminated, parallel the Data 1, Data 2
and GND (ground) conductors of each KPT together. Use terminals on the
KPTs for this connection, or if none are available, double up the conductors
on one screw terminal on each KPT (see Examples A and B).
Do not connect the power conductor between PX-700s!
Each PX-700 should power the keypads plugged into its respective KPT
only. Distribute all the keypads evenly between the PX-700s, regardless of
whether they control a PX-700 Zone or Expansion Room. The DIP switch
setting on each keypad determines which System, Zone and Room it con-
trols, but each PX-700 should power an equal number of keypads. The max-
imum number of keypads per PX-700 is twenty (20). See Important Note
on page 3.5 for details on calculating the maximum amount of ATC
Touchscreen Controllers.
Depicted on the next two pages (in Examples A and B) are two methods to
connect multiple PX-700 units to each other via the RS-485 bus. Both are
electrically identical. However, we have found that Example A provides the
easiest method to isolate and diagnose any RS-485 bus conditions in the field.
Example B provides a single wire connection to each RS-485 connector.
QUICK START GUIDE
2.3