Rogue Engineering 1950-250 - Manual (Page 6)

Modbus/SDI-12 Gateway User Manual Page 6 of 12
Last Updated: August 20, 2013

Add Value Ages – This will optionally append a 16-bit field after each returned value,
indicating the number of seconds since the last successful poll of that value. The highest
number of seconds is 65534, and 65535 indicates that there has not been a successful
poll since power-up.

First Input/Holding Register – This is the first of the consecutive Modbus registers that
will contain the results of these commands. All data can be read with Modbus function
3 or 4. Subtract 1 from this register number to get the Modbus protocol address.

Data Format – Most commands allow you to select the desired return format. 1 char per
register and 2 char per register are only available for Identification command.

Word Order – For 32 bit data formats, this sets the word order.
The Auto-sequence Modbus Registers check-box causes all commands except the first to
automatically set the First Input/Holding Register such that all command results are available in
a single contiguous block of registers. If this is not checked, you can set the location of the
results of each command independently.
Copying Configuration to/from Unit

Ensure that the COM Port and Baud Rate fields at the top of the screen are set properly
to communicate with the unit.

Ensure that you have saved the working configuration to a file before you load from a
unit.

Click the Load Configuration from Unit button to read from a connected unit and
populate the screen with its current configuration.

Click the Save Configuration to Unit button to copy the current configuration from the
screen to a connected unit. The old configuration on the unit will be lost.
Testing a Configuration
Ensure that you have copied the current configuration to the connected unit by using the
Save Configuration to Unit button, then click on the Current Mode button to change from
Configuration mode to Testing mode. In this mode, each time you click the Refresh Command
Results button, the connected unit will be polled for the latest results, and they will be displayed
in the command list. Click the Current Mode button again to exit testing mode.
Sensor Utilities
To access these common SDI-12 sensor utilities, click on the Sensor Utilities tab.