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5. Go to the Local Registers > Action Rules > Thresholds screen.
6. Click Add Threshold Rule and click the arrow next to the new rule to display the parameters.
7. Name and define a threshold rule for the DXM's local register 1 to determine when the value is 128 (good
communication) or something other than 128 (lost link).
This threshold rule sets local register 2 to 0 when Node 1 is in the network and sets local register 2 to 1 when Node
1 has dropped out of the network. Use local register 2 to turn on an LED when the Node has lost its radio link with
its master radio.
8. To turn on a DXM LED, go to the Register Mapping > RTU > RTU Write screen.
9. Click Add Write Rule.
10. Define a Write Rule to write a local register from 2 (Node 1 Health On/Off), to slave ID 201 (Slave ID of the DXM
display) starting at register 1103 (Output LED 2, red light on DXM display) through 1103.
When Node 1 drops out of the wireless network, the red light (LED 2) on the DXM display turns on.
3.5 Verifying Communication Between a Modbus Sensor and
MultiHop Radio or DXM
Follow these steps to monitor a Modbus Banner Engineering sensor connection and/or operation status when the sensor is
connected to a MultiHop radio or a DXM Controller with an embedded MultiHop module.
Required equipment includes:
•
Wireless DXM Controller master with a MultiHop radio module
•
Wireless DXM Controller slaves and/or MultiHop slave radios
•
Modbus sensor such as the Temperature/Humidity Modbus Sensor model M12FTH3Q, or an SDI-12 sensor
•
Windows-based PC running the DXM Configuration Tool v3 (downloaded from the Banner website)
To confirm an active radio communication between the sensor and radio, define Read Rules and Action Rules. Use two
local registers to monitor each Modbus RTU sensor. Use an optional third register to monitor how long the sensor was not
communicating with the radio.
1. Connect to the DXM Controller master radio using serial or TCP/IP.
2. Define the Local Registers.
3. Define the Read Rule.
4. Define the Threshold/Action Rule.
5. Repeat these steps for each Modbus sensor and MultiHop slave radio you'd like to track.
3.5.1 Define the Local Registers
Define the local registers used to verify the connection between a Modbus sensor and a MultiHop radio.
1. Go to the Local Registers > Local Registers in Use screen.
2. Define a register to hold a data point.
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DXM Tips and Tricks
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