HopNet RS-232 Serial ModBus Radio
Restart
The Restart button on the Wizard causes the program to start the radio search and
parameter load process again without shutting the program down. This is particularly
useful when USB-to-RS-232 adapters are used that prevent the Wizard from detecting
that a radio has been disconnected from the computer running the Wizard. If a radio is
disconnected from the computer and the Wizard does not detect it, the Restart button
should be clicked when it or another radio is connected. Note that clicking the Restart
button will not change the parameter values stored for use by the Recover button.
Saving Configurations
Configuration settings that have been applied from the Wizard can be saved for future
use. The Wizard prompts to save changes on initial boot-up, after changes have been
applied and on exiting the Wizard if the changes have not previously been saved. The
default filename for the configuration settings is “hn_xxxxxx.cfg” where xxxxxx is
the serial number of the radio in the HopNet (This serial number is also on the outside
of the radio). To save a configuration under another filename, simply enter the
desired filename in the dialog box. Once a configuration has been saved, it can be
used to set up additional HopNet radios with the same configuration by clicking on
the Load command on the File menu. You will be prompted for a filename to load.
Loading the file will load the parameters into the Wizard program but will not
program the settings into the HopNet radio until the Apply Settings button is clicked.
About Protocols
The HN210D is a Serial Multi-Protocol Radio compatible with Modbus, DNP3 and
DF1 protocols.
Modbus
Modbus is an open data communications network used to exchange of information
among products on the factory floor. In a typical Modbus network, Modbus messages
are sent over an asynchronous serial communication link (EIA standard). This links
inputs and outputs data alternately rather than concurrently.
The Modbus protocol has support from over 500 industrial suppliers. On-line
programming or data acquisition applications are easily supported directly from the
serial port of any computer. Modbus can be used in either a simple point-to-point
manner with a pair of devices or in a network architecture.
The Modbus protocol defines a message structure that controllers will recognize and
use, regardless of the type of networks over which they communicate. It describes the
process a controller uses to request access to another device, how it will respond to
requests from the other devices, and how errors will be detected and reported. It
establishes a common format for the layout and contents of message fields. During
communications on a Modbus network, the protocol determines how each controller
will know its device address, recognize a message addressed to it, determine the kind
of action to be taken, and extract any data or other information contained in the
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2000- 2004 Cirronet
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