Chapter 7: Service and troubleshooting
EST3X Technical Reference Manual 209
Note: Signature Series devices require a solid connection at their terminals. If a
wire can wiggle, it will be subject to contact resistance variations due to
temperature changes. A loose wire can result in an intermittent connection, which
will affect communication between the Signature devices and the control module.
Using a proper size screwdriver, securely tighten all wiring connections.
Substituting Signature loop controller modules
When substituting a known good Signature Series loop controller module in place
of a suspect module, it must be defined in the 3-SDU and the database
downloaded into the panel. See “Downloading a database” on page 67.
The Signature loop controller module has two separate memories.
1. The first memory stores the firmware code that makes the module operate. If
there is a problem with the firmware, or if an upgrade has been issued,
download the new firmware into the module from the 3-SDU. When upgrading
the firmware, do not download the bootstrap data unless specifically
instructed to do so.
2. The second memory stores the Signature loop controller configuration
settings that were compiled in the 3-SDU. If you suspect that the module itself
is bad, download the loop configuration settings for the loop to which the
substitute module is connected.
Substituting Signature Series devices on a nonmapping
loop
When nonmapping DH and DS detectors are configured on a Signature loop,
mapping is disabled for the loop. When substituting a known good detector or
module in place of a suspect device, one of the following scenarios can take
place.
1. If the substituted device is the same model as the suspect device and
preprogrammed with the same device address, the system accepts it with no
further action. When the substituted device is installed, the system goes into
trouble. When the quantity of devices defined on the loop is reached, the
system stores the revised information, updates the device’s personality code
and other parameters, and returns to normal. This process may take a few
minutes.
2. If the substituted device is a different model than the suspect device but is
preprogrammed with the same device address, the system accepts it but
generates a device fault indicating the difference in models. The details of the
trouble indicate a “bad type fault”. To remove the fault, you must accept the
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