Programming
Page 34
May 2020
DSY-PM-01378-EN-08
Bus Address
If the Modbus output is enabled, you must choose a valid Modbus address� 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
BusAddr
prompt, press
ENTER
� The first digit of the address flashes� If the current
setting is correct, press
ENTER
to advance to the next parameter� To change the address,
press
UP
to increment the display digit until it matches the first digit of the new bus
address� Press
RIGHT
to advance to the next digit� Repeat for all digits of the address� Press
ENTER
to accept the new address and advance to the
Baud
parameter�
Baud
If Modbus is being used, all devices connected to the bus must have the same baud rate
setting� Baud is expressed as ‘bits per second’ and defines the data transmission speed
of the network� The B2900 monitor can be changed to use any of the following baud
rates: 9600, 19200, 38400, 57600 and 115200� See
for
additional information�
At the
Baud
prompt, press
ENTER
� The current state of the Baud rate is shown and defaults
to 9600� If the current state is correct, press
ENTER
to advance to the next parameter� To
change the baud rate setting, press
UP
or
RIGHT
to scroll through the options� When the
proper state displays, press
ENTER
to advance to the
SetPt1
parameter�
Set Points
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 B2900
monitor 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
and
Both set point one and set point two are configured using the same procedures but the
hysteresis and tripping conditions are independently set for each set point output�
OTE:
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�
