Monitoring Usage
MONITORING USAGE
The R9120-5 transceiver has several data points that may be read using the Modbus protocol
For each of the two pulse inputs, the R9120-5 transceiver 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 R9120-5 transceiver adds about 500 ms of delay per hop In a complex system with multiple
R9120-5 transceivers, a 1 to 2 second round trip time is not uncommon
Model 3700 Data Display Page
When using the R9120-5 transceiver with the Model 3700 data acquisition server, the server will read the pulse input data
from the R9120-5 transceiver and provide configuration menus for all of the R9120-5 transceiver options
The Model 3700 data acquisition server will report all the data values present on the R9120-5 transceiver In addition, the
instantaneous min/max rate values will be cleared after each logging interval Click the
Configure
button to set up pulse
input names, unit of measure and multipliers as needed
Page 7
June 2016
XMT-UM-02107-EN-01