User's Manual

If mounting multiple tags, ensure that:
• tags must not be mounted one on top of the other
• tags must not be touching
• tags must be no further than 1 foot apart
• there is a minimum clearance between tags of 1 inch
Conserving the Battery
The ST-616 is equipped with a non-replaceable battery that can register up to 60,000 tag events before the battery life
is depleted. Overpolling may cause the battery to be depleted prematurely. The tag has several mechanisms that protect
against overpolling.
Minimizing a tag’s exposure to unintentional reader signals can help extend battery life. The following sections provide
suggestions to conserve a tag’s battery life.
Avoid Overpolling
The most common cause of early battery depletion is overpolling. Overpolling, which can occur when the tag is left idle
within range of an RF reader, such as in a warehouse, shipping yard, or near a gate where fast UHF polling is used. To
avoid overpolling, the ST-616 uses an overpolling suppression feature, which extends battery life in difficult RF
environments such as long-term storage facilities.
Employ Good Business Practices
• Use the Savi tag hibernation mode for tags stored long-term or for future use.
• Maximize use of LF signposts and mobile device operations so the UHF receiver can be left off during normal
operation of the tag. You can turn on the UHF receiver using a LF signpost or LF mobile device prior to issuing
other commands or collections over the UHF link.
Protect Stored Tags
You can protect unused tags from unintentional polling by storing them in a fully enclosed metal container, placed away
from areas where fixed readers or mobile devices are regularly used. You can also wrap tags in aluminum foil to shield
them from nearby UHF signals. To be effective, you must apply multiple, overlapping layers with foil-to-foil contact.
Isolate Storage Areas
Prevent or minimize the polling of stored tags by isolating the storage area. Storage areas should be more than 600 feet
(183m) away from readers mounted within 10 feet (3m) of ground level and 900 feet (274m) away from readers mounted
15 to 20 feet (4.6 to 6m) above ground level.
Note: Storage areas can also be shielded from reader activity by buildings. Be sure that stored tags are not receiving
signals over the top of low buildings, from elsewhere in a storage area, or from within a nearby building.
Low Battery Warning
When the ST-616 detects that its battery power is low, the tag sends a low-battery message to the Savi software in
response to a collect request. At that time, the ST-616 battery is depleted and the tag must be replaced.
12 | OpenTopic | Savi ST-616 Asset Tag Description
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