PTI security systems VP keypad controls entry, Installation And Operation Manual

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This equipment generates, uses, and can radiate radio
frequency energy and if not installed and used in accordance
with the instruction manual, may cause interference to radio
communications. It has been tested and found to comply with the limits
for a Class A computing device pursuant to Subpart J of Part 15 of FCC
rules, which are designed to provide reasonable protection against such
interference when operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause interference in which
case the user, at his/her own expense, will be required to take whatever
measures may be required to correct the interference.
With the RS485 communication scheme, a keypad can be located
as far as 4000 feet from the controller, which is why shielded twisted
pair cable with ground wire is required for optimal operation.
Voltage drops across long lengths of wire must also be considered. The
farther the device is from the controller, the larger the gauge of wire that
must be used. Refer to the Voltage Drop Calculation QuickDoc for more
information. This document is available on our web site at www.ptiaccess.
com/downloads
.
THE SYSTEM WILL NOT OPERATE PROPERLY IF THE
VOLTAGE IS BELOW 12VDC .
Extreme care should be taken
when choosing a power supply voltage and current rating. Long
distance runs may require a remote power supply to be installed in line
with an RB5 relay to ensure proper operation.