N R Mitchell Co, Inc.
934 Industrial Parkway, P O Box 333, Plainwell MI  49080

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Modbus RTU support for the DiaLog Elite

We have just completed the Modbus RTU support for the DiaLog Elite and it is available as version 1.3.0 of all new DiaLog Elite systems and can be upgraded into any already purchased DiaLog Elite units.

Capabilities

The Modbus RTU support allows the Elite to be used as a Modbus slave device and communicated with any SCADA or HMI package that has Modbus support.  The Modbus support works over a direct serial connection or a modem.   If the user wishes to use the Modbus RTU over a modem, they must purchase the modem option.

The following diagram shows how the Elite works as a Modbus device.
 

 

 

 

 

 

 

The Modbus RTU interface allows the following information in the Elite to be written and read from a SCADA or HMI software package.

Elite values

Read

Write

Digital contact state

X

 

Digital totalizer values

X

X

Digital duration counter values

X

X

Analog input values

X

 

Relays

X

X

Alarm states of all channels

X

 

Acknowledge state of all channels

X