Badger Meter Model IOG User Manual

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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:

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

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

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August 2013