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Make sure your master and slave devices have the prerequisite communications
wiring and configuration before configuring your meter as a Modbus master.
If the meter is a Modbus master over TCP/IP, the Modbus TCP/IP and Modbus
RTU protocols must be enabled.
NOTE:
Devices supporting multiple simultaneous Modbus TCP connections
can have communications delays. Adjust your network timeout settings to
accommodate this.
The meter as a Modbus master over TCP/IP attempts to communicate with a
slave device for up to 100 seconds (as per the RFC1122 standard) before moving
on to the next slave device.
1. Start ION Setup.
2. Open the Setup Assistant for your meter.
3. Navigate to
Communications > 3rd Party Protocols
and click on the
Modbus Master
tab.
4. Click
Add
to add a Modbus slave device.
The Modbus Device dialog appears.
5. Enter the Modbus slave information:
– Enter the Modbus slave device’s name and a label suffix (if applicable).
– Select the device type of the slave device from
Device Type
.
– Enter the unit ID of the Modbus slave device into
Slave ID
.
– Select the serial or TCP connection from
Connected via
. This is the
connection from the Modbus master to the slave device.
6. Click
Connections
. The Modbus Master Connections dialog appears.
7. Select the tab that corresponds to the connection you are configuring (for
example, if you selected TCP Connection 1 from
Connected via
, select the
TCP 1 tab) and configure it based on the connection type.
Connection type
Configuration
Serial connection
Select the serial communications port that is connected to the
Modbus slave devices from the Assigned Port list.
TCP connection
Enter the IP address of the Modbus slave device, making sure that
the IP port is set to 502.
Make sure that the Modbus RTU and Modbus TCP/IP protocols are
enabled.
8. Click
OK
to return to the Modbus Device dialog.
9. Click
OK
to add the slave device. The device now appears on the list. Repeat
these steps to add all of your Modbus slave devices.
Related Topics
Configuring your meter as a Modbus slave using ION Setup
Your meter as a Modbus slave
Your meter as a Modbus slave over Ethernet
Your meter can function as a Modbus slave over Ethernet.
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