PR311-BK fv102 Rev B. ENG.doc.DOC
8/9/2006
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The
Communication Bus
can be laid down using free topology – bus, star, three
or any combination of them. It is forbidden to use topology of a ring.
•
Generally the twisted, unshielded cables are recommended for
Communication
Bus
(popular UTP cables). The shielded cables should be used only in installation
when strong electromagnetic interferences exist.
•
No terminating resistors on the ends of
Communication Bus
are required.
•
The maximum cable run between any controller on the
Communication Bus
and
a host PC must not exceed 1200 m.
•
The maximum cable run between controller and external unit(s) connected to
Clock
and
Data
lines (e.g. external reader or I/O extension module) can be
maximum 150 m long.
•
The controller must be supplied form reliable power supply, calculate the
adequate wire gauge to guarantee that the voltage dropout between the power
supply and the supplied unit doesn’t exceed 1V in the worst case.
•
It is recommended to supply door release device (e.g. door strike or magnet
lock) from separate power supply. When both controller and door release device
are supplied from the same power source you must use separate cable pairs for
both of them.
•
Always add the silicon diode (e.g. 1N400x series) in parallel to door release
device – locate diode as close as possible to door release and as far as possible
from the controller.
•
Do not supply the door release from the supply terminals of a controller.
7.
Acoustic and Optical Signals
Table 6. Acoustic signals.
Signal
Symbol
Description
One long signal
♫
Programming error or unknown identifier (card or PIN
not registered in the controller).
Two long signals
♫
♫
Access denied, identifier is registered in controller’s
memory but actually has not access authorization.
Alternatively this signal will occur when controller
operate in Card and PIN mode but user entered only one
from two required form of identification.
Three short beeps
♪♪♪
Command or procedure successfully completed (OK
signal).
Two burst of three
beeps
♪♪♪
♪♪♪
Signal OK. repeated two times is generated each time
the controller restarts.
Two beeps
♪♪
Prompt signal, the reader is waiting for the next part of
the command. This signal is intended to encourage the
programmer to proceed with next programming step.
