Supervisor 4500 User Guide
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PUD4386R1-1
PIN 16 - DHO (Barrier Held Open)
Description
Barrier Held Open is both a setting and an output.
As a setting (accomplished through LaneConfig), the DHO timeout defines the time after which barriers
will close if a number of card accept (ENTACC or EXTACC) or override (ENTOVR or EXTOVR) signals are
received, but users do not pass through the lane. As an example, after a card accept or override signal,
the barriers remain open until a user passes, or for the defined open period if a user does not pass. If a
number of card accept or override signals are received in succession (and there is no user passage), the
DHO setting limits the time the barriers remain open after the last card accept or override signal to the
defined DHO time period (default is 12 seconds).
An output is generated when barriers remain open past the defined DHO time. One example of when this
might occur would be if a sensor in the closing path of the barriers were blocked after opening. In this
case, for safety reasons the barriers will remain open. In such a case the turnstile will generate a DHO
output. This would be in addition to the local alarm that would sound at the turnstile.
Purpose and Customer Use
The DHO output is an important output to monitor. It provides notification if barriers remain open beyond
the expected “open” time. Security camera footage (if available) can be used to review the situation
surrounding generation of this output if desired.
PIN 17 - BREAKAWAY (Barrier Broken Away)
Description
An output contact is generated when the barrier holding force threshold has been exceeded and the
barrier gives way. If the user proceeds through the turnstile, an unauthorized passage output will also be
generated.
Purpose and Customer Use
This is an important output that is monitored by most customers. Security camera footage (if available) can
be used to review the situation surrounding a breakaway alarm.
Outputs (cont.)
Содержание SU4500
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