Badger Meter M-Series M2000 - Manual

IOM-193-02-EN (December 2012)
53400-193 Rev. 2
M-Series® M2000
MODBUS RTU Communication Daughterboard
Installation Manual
OVERVIEW
The MODBUS RTU Communication daughterboard expands the
connectivity of the M-Series M2000 flow meter by facilitating
communication over RS485 using the MODBUS RTU protocol. The
RS485 allows for greater communication distances than RS232 and
provides for multi-point networking.
39 38 37 36 35 34
11 Pin Plug (Connect to “COMMUNICATION” plug on Amplifier Board)
1
1
33 32 31
120 Ω
Termination Jumper
120 Ω
No Termination
RS485 / RS232
Mode Selection Jumper
RS485
RS232
External Connections (Pins 31 – 39)
J4
J3
Pin No. Pin Name Description
31 Analog Output
0…20 mA, 0…10 mA, 2…10 mA,
4…20 mA
32 COM Common ground connection
33 RS232 RX Receive input for RS232
34 RS232 TX Transient output for RS232
35 COM Common ground connection
36 RS485 ( – ) Inverting signal for RS485
37 RS485 ( + ) Non inverting signal for RS485
38
RS232/485
Shield
Shield input for RS232 or RS485
39 Chassi
Connection for coupling shield to
chassi
INSTALLING THE DAUGHTERBOARD
1. Use the provided self-adhesive tape to secure the foam pad
near the 11-pin COMMUNICATION connector.
2. Remove the board support screw near the 11-pin
COMMUNICATION connector to install the green chassis
connection wire (with an eye washer). Connect the other end of
the chassis connection wire to pin 39.
3. Select operation mode RS485 or RS232 for the daughterboard
using J4.
4. For RS485 mode only: Select the termination (that is, 120 Ω or
No termination) using J3.
NOTE: 120 Ω termination is typically required when the meter is
the first or last device in the communication link.
NOTE: It is assumed all signal biasing is accomplished at the
MODBUS RTU master node. For biasing calculations,
receiver input impedance is 96 k Ω or 1/8 unit loads.
DISCONNECT THE INPUT POWER BEFORE ACCESSING
THE EQUIPMENT.
5. Turn off the meter and insert the daughterboard into the keyed
11-pin COMMUNICATION connector on the amplifier.
CONFIGURING THE PORT B MODBUS RTU
The MODBUS RTU Communication Daughterboard is a slave device
that communicates over Port B. The following Port B settings are
configurable from the meter’s menu manager.
Setting Options
Port address 1 to 247
Ext. port address
Not applicable for MODBUS RTU
daughterboard
Baud rate 9600 (default), 19200, 38400
Data bits 5, 7, 8 (default)
Parity None, Even (default), Odd
Stop bits 1 (default), 2
To change the configuration of Port B to match your system
requirements:
1. Turn on the meter.
2. Navigate to Main Menu > Communication > Port B Settings.
3. Verify that the settings are an appropriate match for the
application. If not, change the settings as necessary.
Please refer to M2000 MODBUS Memory Map Application Brief for
accessible registers.