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Electro Industries/GaugeTech
Doc # E134-7-15 V1.01
2-10
2.3: Communicating with the I/O Modules
2.3: Communicating with the I/O Modules
2.3.1: Communication Setup
2.3.1: Communication Setup
n
All I/O Modules can read and/or write data messages. To communicate with an I/O Module, a
connection must be made with the module via Modbus Protocol. The hardware used to make the
connection can take a number of different forms.
1. The user can make a connection
directly using a
PC with
appropriate terminal software
.
Installation is similar to that in
section 2.2. A PC can be connected
to IO modules using a suitable
RS-485 to RS-232 converter and a
power supply.
2.
Nexus 1250/1252
can be used to
connect the I/O Module with a PC
via Modbus Protocol. The Nexus
has an Internal Power Supply that
will support up to 4 I/O Modules.
See section 2.2 for installation.
3 & 4. The I/O Modules with an external Power Supply can also connect directly to a PLC or an
RTU with a 2-Wire RS-485 hookup. Wiring will depend on the particular unit in use. An
RS-485/232 Converter may be required. Using software which
must be able to generate CRC
checksum at the end of any message,
the user can interact with an IO module directly in
Modbus RTU protocol. The user can write to registers (and/or) read those registers back.
Refer to Chapter 3 for Modbus Protocol functions and Chapter 4 for Communication Data Formats.
2.3.2: Using Nexus Communicator or Nexus Programmer Software
2.3.2: Using Nexus Communicator or Nexus Programmer Software
n
Nexus Communicator or Nexus Programmer Software communicates with an I/O Module directly,
whether the I/O Module is connected to a Nexus 1250/1252 meter or the I/O is a stand-alone.
Below are steps required to communicate directly to the I/O Module using a PC, a power supply for
the I/O Module and an RS-485/RS-232 converter.
1.
Install Communication Wiring
Direct Connection shown here.
For more details, see section 2.2.6.
2.
Install Nexus Communicator software.
In order to communicate with an I/O
module via Nexus Communicator software, you must have Nexus Communicator installed on
your PC. For installation details, refer to the
Nexus Communicator User’s Manual
.
Summary of Contents for I/O Module
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