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7.4.5 Interval Type
The interval setting specifies how you want auto-
matic checkback tests to be performed. You have
two options: Timed and Periodic. In "timed"
mode, automatic checkback tests are performed at
your four user-specified times. These might be,
say, 6:00, 12:00, 17:00, and 23:00. In "periodic"
mode, automatic tests are performed every so
many hours, for example, every eight (8) hours.
7.4.6 Carrier Recovery
You can set a unit to start "automatic carrier recov-
ery" mode after failing a checkback test. In this
mode, the unit initiates more frequent automatic
checkback tests until it has three successful, con-
secutive tests. It then reverts to the normal check-
back schedule, that is, "timed" or "periodic"
checkback tests.
A remote also starts its version of automatic recov-
ery after failing its own checkback attempts. Once
in automatic recovery mode, a remote does not
initiate any automatic checkback requests. It
remains in automatic recovery mode until it pass-
es three checkback tests. Normally, these tests are
issued automatically by the master, but you can
speed things up by executing manual tests at a
remote or the master. After three good tests,
remotes also resume normal operation.
When starting automatic recovery mode, a system
slowly flashes the front panel with reco, to indi-
cate it is in recovery.
Master
Address
(0)
Remote
Address
(10)
Figure 7–4. Maximum Checkback Configuration in Coded Communications Mode.
May 2012
Remote
Remote
Address
Address
(1)
(2)
Remote
Remote
Address
Address
(9)
(8)
Chapter 7. Optional Testing Facilities
7.4.7 Retries
During noisy line conditions, remote messages
may contain errors that cannot be fixed at the des-
tination module. With this setting, you can specify
the maximum number of times you want the mod-
ule to automatically resend a message. The valid
range is zero (0) to 15 (times). A good compro-
mise between communication speed and robust-
ness is a setting of "3" to "5".
7.4.8 Auto tests
Automatic checkback tests can be enabled or dis-
abled. Normally, you would probably want them
to be enabled. But if, for example, you are
installing a new checkback system, you might
Master
Address
(0)
Remote
Address
(4)
Figure 7–3. Maximum Checkback Configuration
in Timed Communications Mode.
Remote
Address
(3)
Remote
Address
(7)
Remote
Address
(1)
Remote
Address
(2)
Remote
Address
(3)
Remote
Address
(4)
Remote
Address
(5)
Remote
Address
(6)
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Troubleshooting
