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UPLC™ Application Manual
7.3.2 Checkback Outputs
Delayed Alarm–(Output set after a system
fails to recover from auto recovery before
the Carrier Recovery Window expires.)
Test In Progress–(Output set by the system
initiating a checkback test for the duration
of the test.)
Successful Test–(Output set after passing a
checkback test.)
Successful Carrier Recovery–(Output set for
one second after a successful recovery from
automatic recovery mode.)
Major Alarm–(Output set when system fails
a high-power test.)
Minor Alarm–(Output set when system fails
a low-power test.)
Disable Automatic Tests–(Output set when
the user has disabled automatic checkback
tests.)
In Auto Recovery Mode–(Output set while in
automatic recovery mode.)
You can program the alarm outputs to seal or just
momentarily toggle when an alarm occurs. When
you select sealed operation, the alarm outputs stay
in their true, or energized, states as long as the
alarm exists. If you select momentary, the outputs
go to their true states for only five seconds, then
return to their previous states. For example,
assume alarms are set to momentary action and the
major alarm active state is closed. Normally this
output is open. When a major alarm occurs, the
MAJOR ALARM output closes for five seconds
then opens again. The MAJOR ALARM output
does not change (again) when the major alarm is
cleared.
7.4 Checkback Configuration
Each Automatic Checkback system in the carrier
network has a unique address. By definition,
remote #1's address is "1", remote #2's address is
"2", and so on. The master is always assigned
address "0". These addresses are used to define
how a checkback unit behaves, as well as to allow
distant communication between terminals. You
Page 7–4
assign terminal addresses on the Checkback set-
tings page.
7.4.1 Setting Descriptions
The checkback system can be configured in many
ways. Following are descriptions of each setting.
7.4.2 Primary Comm Mode
This setting shows the communication mode that
is initially used when the unit attempts a check-
back test. There are two options: coded and timed.
In coded mode, five-byte data messages are sent
back and forth between units. In timed mode, the
carrier is simply held on for several seconds; the
actual time specifies with which unit we are trying
to communicate: the master responds to a five-sec-
ond carrier burst, remote #1 to 10 seconds, remote
#2 to 15 seconds, and so on.
7.4.3 Fallback Timed Comm
When this setting is enabled and the Primary
Comm Mode is set to "coded", the unit shifts com-
munications mode to timed communication once
it has failed all attempts to perform a coded check-
back test. If the primary communications mode is
already set to timed, the fallback feature is
ignored.
7.4.4 Last Remote
Your network may contain more than two check-
back terminals (i.e., one master and one remote).
Among other things, this setting lets the unit know
the final address to which it needs to send a check-
back test request. If the primary communication
mode is set to "timed", you can have up to four (4)
remotes. If it is set to "coded", you can have up to
10 remotes. (see Figures 7–3 & 7–4)
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Troubleshooting
