Conducting A Site Survey Using Modbus Commands - Banner SureCross DX80 Product Manual

3. Single-click button 1 to scroll across the menu levels until reaching the Site Survey (SITE) menu.
4. Single-click button 2 to enter the Site Survey menu.
5. Single-click button 2 to begin conducting a Site Survey with the Node selected in step 2.
The Gateway analyzes the quality of the signal from the selected Node by counting the number of data packets it re-
ceives from the Node.
6. Examine reception readings (M, R, Y, G) of the Gateway at various locations.
Site survey results display as a percentage. M represents the percent of missed packets while R, Y, and G represent the
percent of received packets at a given signal strength.
M = Percent of missed packets; R = RED marginal signal; Y = YELLOW good signal; G = GREEN excellent signal. Re-
cord the results if you need troubleshooting assistance from the factory.
7. Change the Gateway's right rotary dial to conduct a Site Survey with another Node and repeat steps 2 through 6.
8. To end the Site Survey, double-click button 2.
9. Change the Gateway's right rotary dial back to 0.
The LCD displays the device readings for the Gateway.
10. Double-click button 2 to move back to the top level menu.
11. Single-click button 1 to return to RUN mode.
12. Install the rotary dial access cover, referring to the Installation section of the manual to create an IP67 seal.

3.7.2 Conducting a Site Survey Using Modbus Commands

A Site Survey can be started using Modbus commands sent from the host system.
To start a Site Survey using a Modbus write holding register command, send a control code of 32 (0x20) and the Node
number 1–15 (0x01 to 0x0F) to the Gateway Modbus holding register for I/O 15.
I/O 15
Control Code Data Field
32 Node # 1-15
3.7.2 Example Command
I/O 15
When Site Survey runs, the accumulated results are stored in the Gateway's I/O 7 and I/O 8 holding registers. The LEDs
on the both the Gateway and the Node's front panel display the signal strength for the wireless RF link. The quality of the
communications link is indicated by:
LED 1 is green = excellent signal strength
LED 2 is yellow = good signal strength
LED 1 is red = poor signal strength
The signal strength is the transmitted signal strength relative to the ambient RF signal present in a specific location, or
noise floor.
18
[15:8]
Control Code
I/O 15 Control Messages
Restrictions Description
Gateway only Enable Site Survey between Gateway and Node defined by the data
field. All error messages from the Gateway are ignored when running
Site Survey.
Only one Node can participate in Site Survey at any given time. To
disable the Site Survey, use control code 0x20 with Node 0. A Node
must be enabled to run the Site Survey, then disabled before select-
ing the next Node.
32
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SureCross DX80 and Performance DX80 Product Manual
Modbus Register
Modbus Register
[7:0]
Data Field
02
Rev. J