Aalborg DPM Series Operating Manual page 53

NOTE: Before changing the communication interface type, make sure
that the host device (PC or PLC) has the same interface type.
Connecting the instrument to the wrong communication interface may
cause damage or result in faulty operation of the electronics circuitry.
b b ) ) B B a a u u d d R R a a t t e e S S e e t t t t i i n n g g s s ( ( T T a a b b u u l l a a r e e n n t t ry y )
This option determines the device's digital communication interface speed
(Baud rate). It can be set to one of the following:
1200
2400
4800
9600
19200
38400
57600
115200
By default, the device is shipped from the factory with its baud rate set to
9600.
NOTE: The baud rate set on the DPM meter should always match
the baud rate of the host PC and/or PLC that it is connected to.
c) RS-485 Bus Address (Numerical entry)
The RS-232 interface does not require bus addressing. The RS-485
interface, however, does require 2 hexadecimal characters of the address
to be assigned. By default, each flow meter is shipped with its RS-485
address set to 11 hexadecimal. When more than one device is present on
the RS-485, each device must have a unique address. The 2 characters
of the address in the hexadecimal representation can be changed from 01
to FF.
NOTE: Address 00 is reserved for global addressing. Do not assign
the global address to any device. When a command with the global
address is sent, all devices on the RS-485 bus execute the
command but do not reply with an acknowledgement message.
NOTE: Do not assign the same RS-485 address for two or more
devices on the same RS-485 bus. If two or more devices with the
same address are connected to one RS-485 network, a
communication collision will take place on the bus, causing
communication errors to occur.
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