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3.7 Conducting a Site Survey (Gateway and Nodes)
A Site Survey, also known as a Radio Signal Strength Indication (RSSI), analyzes the radio communications link between
the Gateway and any Node within the network by analyzing the radio signal strength of received data packets and
reporting the number of missed packets that required a retry.
Perform a Site Survey before permanently installing the radio network to ensure reliable communication. Activate Site
Survey mode from either the Gateway buttons or the Gateway Modbus holding register 15. Only the Gateway can initiate a
Site Survey, and the Site Survey analyzes the radio communications link with one Node at a time.
3.7.1 SITE (Site Survey) Menu
The SITE menu displays the results of a Site Survey conducted with this Gateway.
NOD XX
M XX
R XX
Y XX
G XX
* SITE
Single-click
Button 2
Single-click
Button 2
Double-click
Button 2
adjust right rotary
switch to survey the
selected Node
Double-click
Button
2
AUTO
DISPLAY
LOOP
Site Survey
Gateway
The SITE menu displays the device number of the Node the Site Survey was
conducted with as well as the missed, green, yellow, and red received packet
count.
The SITE menu is only available on the Gateways.
To access the SITE menu, single-click button 1 to scroll across the menu levels
until reaching the Site Survey (SITE) menu.
See Conducting a Site Survey Using the Menu System on page 17.
See Interpreting the Site Survey Results on page 18.
Conducting a Site Survey Using the Menu System
Initiate a Site Survey using the Gateway’s buttons and menu system.
1. Remove the rotary dial access cover.
2. To check the status of Node 1, change the Gateway’s right rotary dial to 1.
The Gateway is now enabled to read the status of Node 1; the display scrolls through the Node’s I/O status.
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
receives 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.
Record the results if you need troubleshooting assistance from the factory.
SureCross Wireless I/O Networks
17