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1.2: PC to Nexus® Meter Serial Communications
Use either of the two following methods:
1.2.1: Optical Port
Connect with Modbus RTU, 9600 Baud Rate (Initial setting).
The A7Z uses no power supply. All power is received from the
host PC serial port via TX/RX circuits in the probe. Connect the
A7Z at one end to the meter's Optical Port. At the other end,
connect to a PC's RS232 serial port (9- or 25-pin).
1.2.2: Serial Communications
Connect with Modbus RTU, 57600 Baud Rate.
Connect meter's Port 1 (or 4) (RS485) serial
communications port to PC's RS232 serial
port via a Unicom RS485/RS232 Converter.
Programming the Nexus
Programming the Nexus® meter is much simpler than other high function meters. Here are some
things you may find different about the Nexus® meter:
•
All functions operate simultaneously in the Nexus® meter. You don't need to select which
subset of functionality is needed for a particular application.
•
The Nexus® meter is shipped with Initial settings that allow it to operate. Programming
consists primarily of modifying the Initial settings (Device Profile), as necessary.
•
The key steps to programming a Nexus® meter are:
1. Setting up communications.
2. Entering site information (CT and PT ratios).
3. Setting limits.
4. Selecting items to be displayed.
1.3: Install Communicator EXT Software & Connect
See section 1.2 of Communicator EXT Manual for details. The setup process is simple - just insert a
Communicator EXT CD into the disc drive; the software walks you through the installation process.
If auto-start doesn't begin, use Windows Explorer:
1. Right-click Start Button and select Explorer.
2. Then select the drive with the Communicator EXT CD.
3. To start installation, double click "Communicator Setup.exe".
Use Communicator EXT's Quick Connect (or Connect) function to set up the Communication link.
The Command is: Connection > Quick Connect (or Connect).
Ethernet Connection:
Modem:
The Device Status Screen appears when the connection is complete.
Electro Industries/Gauge Tech
Meter
®
Connect with Network, Modbus TCP, 57600.
Connection Manager, Modbus ASCII, 57600.
Doc # E151701
Fig 1.5: A7Z Communication Interface
1-2
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