Configuring the Encompass 4 Reader
8-21
3. Enter command #01 to switch to command mode. You are prompted with
#DONE from the reader and can now enter reader commands.
4. Enter in command #64401 to lower the RF power by 1 dB below 2 watts
(default). Press ENTER.
Note: In the command #644NN, NN can be any hexadecimal value from 00 to
0A. Settings for attenuation are 1.0 dB increments over a range of 10 dB of atten
-
uation from the maximum power setting of 2 watts at 0 dB attenuation to a mini-
mum power level of 200 milliwatts at 10 dB attenuation. Increasing the
attenuation lowers the output RF power.
5. Switch to data mode by entering command #00 and pressing ENTER.
6. Verify that the read zone has decreased by moving the tag through the desired
read area. If the read zone is still too large, switch to command mode and enter
the command #64402 to lower the output RF power another 1 dB. Continue
increasing the NN value until the read zone matches the desired read zone.
7. Follow the steps in “Procedures” on page 4-39 to mark the new read zone on the
ground with tape or chalk.
When the desired read zone is established, test the read zone with simulated and
real traffic by performing the following procedures:
To test the read zone
1. Ensure that the Encompass 4 Reader is in data mode.
2. With the Encompass 4 Reader running, place one tag behind your back while you
hold another tag in the new read zone. If a valid read, the data from the tag held in
the read zone displays on the PC screen.
3. Switch tags, placing the other tag behind your back and holding the first tag in
the read zone. If a valid read, the data from this tag held in the read zone displays
on the PC screen. If both tags are read, you have successfully adjusted the read
range.
4. If one or both tags did not read, follow the suggestions in “Verifying Tag Read
Capability” on page 8-10.
5. As a last test, attach test tags to vehicles and simulate traffic going through the
read zone to verify that the system performs accurately in a live environment.
Fine-tuning the Read Zone by Adjusting Sensitivity Range
The Encompass 4 Reader read zone can be fine-tuned by using command #643NN
for ATA tag read mode or #645NN for eGo and eGo Plus tag read mode to reprogram
the RF sensitivity range. Sensitivity range adjustments have less impact on the read
pattern than RF power adjustment, thus RF power adjustment should be used as the
main read pattern adjustment tool. Sensitivity range control may be helpful in stop
-
ping some tag reads on the very edges of the read pattern. To produce a noticeable
change in the read pattern, you must decrease the range sensitivity by more than one
increment.
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