IT2200 Reader System with Multimode Capability Installation & Maintenance/Service Guide
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6. If a message appears signifying a buffer overflow, the total number of
handshakes is too high for the host to process. To continue this test, drive
faster through the lane to reduce the handshake count.
7. Drive the vehicle through the lane three times. The handshake count should be
significantly lower than the number obtained with the IT2200-series tags. A
good handshake count for an ATA tag tested at 40 km/h (25 mph) is
approximately 12 handshakes. Handshake counts of 7 to 8 are acceptable
when targeting an 80 km/h (50 mph) application.
Adjusting the Read/Write Zone
The read/write zone is adjusted by changing the antenna position, antenna mounting
angle, and uplink and downlink RF power. The nominal antenna angle is 15° up from
horizontal in a dedicated lane and 10° up in a mixed-use lane.
ATA-type tags are unaffected by downlink power. The read range for ATA tags can be
adjusted by increasing or decreasing uplink power levels, or by adjusting antenna
uptilt angles.
IT2200-series tags are relatively insensitive to uplink power changes. You need uplink
power to communicate with IT2200-series tags, but you can set uplink power at mid-
dle to low power levels with little effect on performance. However, downlink power
significantly affects the read/write zone for IT2200-series tags. Antenna uptilt angle
and placement are also important in determining the read zone length for IT2200-
series tags.
Completing Antenna Connections
When all tests and connections are completed, shrink the tubing by using a commer-
cial heat gun at the connections between the antennas and the coaxial cables to water-
proof the connections.
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