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Chapter 1. Overview
1 - 1 Overview
This flame monitor, model AUR355 (hereinafter also “this device”), has RS-485 communication functions and can
communicate with a PC, PLC, or other host device using a user-configured program.
The communication protocol is CPL.*
For example, if the host device is a PC, it is possible to use CPL to monitor the operating status of this device or to
delete data via the RS-232C port or RS-485.
*CPL (Controller Peripheral Link) is Azbil’s host communication protocol.
Features
The features of this device’s communication function are as follows:
• Up to 32 modules can be connected to a single master station acting as a host
device.
• The separately sold Smart Device Gateway, model NX-SVG, is required for
communication with the host device.
• Transmission speeds can be up to 19200 bps.
• Besides continuous access commands, random access commands are available.
Reading or writing to noncontiguous addresses is supported.
Communication functions
This device has two communication ports.
One is for host communication (RS-485), and the other is for loader
communication (limited to use with the SLP-A55 loader).
Host communication is through the front connector on the front of this device, and
loader communication is through the loader jack on the front of this device.
Host communication can be used for hard-wired communication between devices
within the equipment and for monitoring the status of multiple AUR355 units.
On the other hand, loader communication is for connection to the SLP-A55 (a PC-
based software tool) and uses a special cable.
Loader communication is useful for data analysis in the field. For example, it can be
used when doing equipment maintenance.
For loader communication, refer to CP-UM-5956JE.
The purpose of the present manual is to explain host communication.
Using the RS-485 protocol, up to 32 devices (slave stations) can be connected to a
host device (master station). Also, device addresses are used to communicate with
specific slave stations.
With RS-485, using a procedure like the following, various kinds of data can be read
from a device, and error history and number of errors can be cleared.
1. The master station transmits command messages to the slave stations.
2. The master station receives response messages from the slave stations.
• The master station sends read or write commands.
• You can freely select the type of data to read or write by using data addresses.
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