IT2200 Reader System with Multimode Capability Installation & Maintenance/Service Guide
3-20
Functions
The IT2235 Tag has the same BIST capability as the IT2221 Tag. Results of the
self-tests are stored and accessed in the same manner described for the IT2221 Tag. A
unique visual and/or audio indication can be activated on the tag by either a
programmer, portable reader, or in-lane reader as a means of providing notification of
these test results.
The rates for downlink messages and uplink messages are as follows:
The LCD alphanumeric display of the IT2235 Tag is activated in the following man-
ner:
• The LCD automatically displays messages during a transaction.
• The LCD displays on demand by pressing the button.
The tag’s alphanumeric LCD is automatically activated during the transaction to
display the messages indicated in this section. These messages have an automatic
shut-off after a time delay of 4 seconds and require no intervention from the patron. If
the patron wants to view additional messages sent by the toll agency, they are
available by scrolling through using the button. After a time delay of 4 seconds, the
LCD display clears itself, allowing the tag to go to a low power mode.
The alphanumeric LCD is also activated by pressing the button. The message readout
consists of 16 characters. The message displays on a single line for ease of reading.
Table 3-2 shows the condition code bits. These condition code bits each represent a
condition applicable to a tolling environment. There are 8 different conditions that can
arise, and there can be multiple conditions. The condition with the highest priority is
the sequence that is displayed upon receipt of a general ACK request. The other
conditions can be accessed by cycling to them using the pushbutton switch on the tag.
Downlink data rate
Encoded: 300 kbps
Manchester decoded: 300 kbps
Uplink data rate
Encoded: 600/1200 kHz
FSK decoded: 300 kbps
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