The Gateway device also displays the Site Survey results on the LCD. For one transmit and receive interval, the Gateway
saves the lowest signal strength. The LCD and Modbus registers contain the results of the last 100 samples. The totals are
a running tally of the last 100 samples and are continuously updated. Four categories are displayed:
G (green) = excellent signal strength
Y (yellow) = good signal strength
R (red) = poor signal strength
M = Missed packet
To disable Site Survey, send a control code of 32 (0x20) and a Node number of 0 (0x0).
3.7.2 Site Survey Data Holding
With Site Survey active, registers I/O 7 and 8 are Site Survey data holding registers that store the accumulated Site Sur-
vey results. Error collections in holding register 8 are saved when Site Survey runs and restored after Site Survey is disa-
bled.
Register
[15:8]
[7:0]
I/O 7
Red Total
Missed Total
I/O 8
Green Total
Yellow Total
Example Results
[15:8]
[7:0]
I/O 7
10
0
I/O 8
80
10
Note: This is the current register arrangement when using Modbus/TCP or Modbus RTU. In some older models, the Mod-
bus/TCP registers are reversed (missed and yellow totals are in [8:15], red and green totals are in [0:7]).
3.7.3 Interpreting the Site Survey Results
Site Survey results are listed as a percentage of data packets received and indicate the signal strength of the received signal.
Result
Description
Green
Packets received at a strong signal strength. A strong signal
strength is greater than
−
90 dBm at the receiver.
Yellow
Packets received at a good signal strength. A good signal is be-
tween
−
90 and
−
100 dBm at the receiver.
Red
Packets received at a weak signal strength. A weak signal is less
than
−
100 dBm at the receiver.
SureCross DX80 and Performance DX80 Product Manual
Rev. J
www.bannerengineering.com - tel: 763-544-3164
19