User's Guide

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User Guide
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TFF-2220-00AA and TFF-2221-00AA User’s Guide D1436 Rev B
©2008 Zebra Enterprise Solutions. WhereCall IV and all product names and numbers are Zebra Enterprise Solutions trademarks. All other trademarks are the property of their respective owners.
8.4.3 WhereCall IV PLC Switch Operation
The switch used to operate the TFF-2221 must be a momentary type. The TFF-2221 will
initiate a “Button Blink” sequence when the switch breaks after having been closed for at least
100ms and less than 5 s. It the switch is closed for less than 100 ms the unit will not react. See
Table 1 for more information.
If the switch remains closed for three (3 seconds or more the unit will change to the “OFF”
mode.
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