Product category:
Stand-Alone Instruments
News Release from: New Forest Electronics | Subject: SDA-02
Edited by the Electronicstalk Editorial
Team on 28 February 2006
Analyser adds Modbus over serial line
protocol
New Forest Electronics has upgraded its model SDA-02 handheld serial data analyser to handle the Modbus over serial line protocol.
New Forest Electronics has upgraded its model SDA-02 handheld serial data analyser to handle the Modbus over serial line protocol The new Modbus over serial line feature helps the user in three main ways
This article was originally published on Electronicstalk on 12 Feb 2003 at 8.00am (UK)
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Serial data analyser becomes transmitter
New Forest Electronics has added a significant new feature to its SDA-02 handheld serial data analyser.
It displays and analyses monitored Modbus messages in an easily viewed way, with automatic validation of CRC/LRC, and instant display of RTU timing errors.
It allows the user to conveniently define and transmit test messages in Modbus format, without having to calculate CRC/LRC values.
And it can download captured data to a PC, so it appears in Modbus format.
It works with either "ASCII" or "RTU" (binary) transmission mode framing.
This upgrade is designed mainly to help find "low level" Modbus problems, ie those involving Modbus message framing and timing as specified by the Modbus over serial line specification.
It does not separate and identify fields within the Modbus application protocol being transported by the Modbus frame, as done by many PC based analysers.
It does show the application message, but the separate fields have to be identified by inspection by the user.
Thus in diagnosing systems, the SDA's strength lies in being able to identify these "low level" problems.
One these have been rectified if required, a PC based analyser may be used if necessary to identify and debug any remaining application protocol issues.
The facility is provided on all new SDA-02 analysers from New Forest Electronics, and is available as a firmware upgrade to those sold since May 2005.
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