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 attenuation from the maximum
power setting of 2 watts at 0 dB attenuation to a minimum 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.
“Marking the Read Zone” on page 4-63
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.
4. If both tags are read, you have successfully adjusted the read range. If one or both tags did not read,
follow the suggestions in
“Verifying Tag Read Capability” on page 8–137
.
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
stopping 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.
To adjust the read zone by adjusting sensitivity range
1. Ensure that your PC is communicating with the Encompass 4 Reader using a terminal emulation
“Verifying Communications” on page 8–136
2. Mark the current read zone as described in
“Marking the Read Zone” on page 4-63
. Enter command
#01
to switch to command mode. You are prompted with
#DONE
from the reader and can now enter
reader commands.
Chapter 8 Configuring the Encompass 4 Reader
TransCore Proprietary
8–147
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