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Communication
RS485 COM Port Configuration
The RS485 is very simple to configure .
1 . Select the communications type: Modbus or BACnet .
2 . Choose the BAUD Rate: Auto, 300, 1200, 2400, 9600, 19200, 38400, or 76800 to match the rest of the devices on the
network . The factory default of 9600 is recommended for most systems . The lower the baud rates have greater stability,
and greater tolerance of wiring and other hardware issues .
3 . Configure the Modbus or BACnet are described in there respective sections .
Modbus
Network: RS485
Baud Rate: Selectable
Protocol: RTU or ASCII
Addresses: 001 to 248
Slave only
Read Input Registers 30001- 39999 (Function "04")
Data Type: IEEE 754 Float (ABCD – CDAB)
Each variable is stored in two Modbus registers; lowest byte in the first and highest in the second .
Only the variable value is transmitted .
The associated units of measure must be manually configured in the receiving Modbus device .
Flow 1 Rate
(Input Register 30002 + 30003)
Flow 1 Total
(Input Register 30006 + 30007)
Modbus uses the following:
Data Bits = 8
Stop Bits = 1
Parity = None
BACnet
The Series 3000 can be configured to communicate on a BACnet RS485 MSTP (Master Slave Token Passing) system .
Configuration is via the front panel keypad .
The following settings are required
•
Baud Rate: [9600; 19200; 38400; or 76800] . The recommended factory default is 9600 .
•
MSTP Address: [0...127] . Each device must have a unique address .
•
MSTP MAX master: [0...127] . This range must be greater than the highest address on the network .
•
Device Instance: [00000000...99999999] . This is a unique identifier for each device in the system .
Object Name
BACnet Address
BACnet BaudRate
Flow 1 Rate
Flow 1 Total
Note 1: 0 = Auto, 1 = 9600, 2 = 19200, 3 = 38400, 4 = 76800
Note 2: Units of measure are selected by installer from a list of pre-programmed units, or as custom units created by the
installer . BACnet will transmit in the same units as displayed on the flow meter's front panel LCD .
April 2017
I/O (Write/Read)
Object Type
I/O
Analog Value
I/O
Multi-State
O
Analog Input
O
Analog Input
DSY-UM-01667-EN-05
Object ID
Units
AV1
MSV1
See Note 1
AI1
Same as Displayed
AI3
Same as Displayed
Programming
Page 19
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