Badger Meter Model IOG - Manual (Page 22)

Modbus (Modbus)
Extended Function (Advanced Version Only)
The Modbus output parameter can be either Enabled or Disabled When enabled, this output allows communications with the
ER-500 using the Modbus RTU protocol For additional information see Modbus Interface in the APPENDIX of this manual
At the Modbus prompt, press the ENTER button once The current state of the Modbus output is shown If the current
state is correct, press the ENTER button to advance to the next parameter
If the current state requires a change, use either the
▲ or ► arrow button to toggle between state When the proper
state has been selected press the ENTER button.
BUS ADDRESS (BusAddr)
If the Modbus output is enabled a valid Modbus address must also be selected Every device communicating over the
RS485 communications bus using the Modbus protocol must have a unique bus address Address values range from
0…127 with 0 being the default
At the bus address BusAddr prompt, press the ENTER button once The current setting begins to flash If the current
setting is correct, press the ENTER button to advance to the next parameter
If the current setting requires a change, use the
▲ arrow button, increment the display digit until it matches the
first digit of the desired bus address Next press the ► arrow button to advance to the next digit and using the ▲
arrow button, increment the second digit until it matches the second digit of the desired address Repeat this step
for the third digit of the address and then press the ENTER button once to save the new address and advance to the
next parameter
Set Points (SetPt 1/SetPt 2)
Set points allow the meter to signal when a specific flow condition has been achieved They are commonly used to
indicate high or low flow conditions that need attention The ER-500 has two open collector outputs controlled by the set
point function
The set point transistors have the same current limitations and setup requirements as the totalizing pulse output transistors
described previously See Figure 16 for control output transistor connections
Both set point 1 and set point 2 are configured using the same procedures but the hysteresis and tripping conditions can be
different for each set point output
NOTE: N In most instances the current capacity of an open collector transistor is not sufficient to operate old style counters
that relied on relay contact closures When used with basic counting circuits a solid state relay is needed (See Figure
17 for a connection example)
Set Point 1 (SetPt 1)
Extended Function (Advanced Version Only)
The set point is the flow value at which the output transistor changes state It is set using the same units as the rate units
are entered
ER-500 Flow Monitor
Page 22 August 2013