Leviton ModHopper Installation And Operation Manual page 9

5 CONFIGURATION
5.4 Signal Strength Test
When the ModHopper is operating, the Test Button can be used to report the signal strength received by the
ModHopper from another unit.
Press and hold down the test button. The status LEDs will light up as a bar graph display. Each LED is
approximately 10% of scale. For example if PULSE 1 and 2 are on, the received strength is approximately
20% to 29%.
For useful signal reporting, it is important to turn off all but one other ModHopper. When reporting the signal
strength, the most recent wireless transmission received is displayed. If two ModHoppers are transmitting,
the display will only show the most recently received packet, and the user will not be able to determine which
ModHopper the signal strength being reported.
Note: the normal operation of the ModHopper is suspended while the test button is pressed.
Modbus communications and wireless transmissions are not processed.
5.5 Monitoring usage
The ModHopper has several data points that may be read using the Modbus protocol.
For each of the two pulse inputs, the ModHopper reports a value for consumption and rate. Rate fields are
provided for the average rate during the log period (block demand), the instantaneous rate, and the min/max
instantaneous rate observed during the log period. The pulse counts for each input are stored in
non-volatile memory to preserve the count when power is removed. For more information on the specific
Modbus registers used for the pulse inputs, refer to the Modbus register section of this manual.
When configuring a Modbus Master such as a PLC, TCP Gateway, or computer software, you must increase
the timeout on the RS485 port of your system. The ModHopper adds about 500mS of delay per hop. In a
complex system with multiple ModHoppers, a 1 to 2 second round trip time is not uncommon.
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