OTT HydroMet SUTRON XLINK 100, Руководство по эксплуатации и техническому обслуживанию

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Holding Registers
Holding registers are reserved for the purpose of setting and getting data such as the date and time and
diagnostic counts if the ability to send the above Diagnostic (0x08) command is not available. The
following table identifies the holding registers and their locations. Each of these registers is an unsigned
16-bit value (if readings registers using an Xpert, set the data type to ushort).
Data Register Valid Data Values
Hour of current time 1001 0 – 23
Minute of current time 1002 0 – 59
Second of current time 1003 0 – 59
Year of current time 1004 > 2000
Month of current date 1005 1 – 12
Day of current month 1006 1 – 31
Recording status
1007 1 means running
0 means stopped
Reset Unit 1008 Write 1 to reset
Modbus Protocol 1009
0 – RTU
1 – ASCII
Force Measurement * 1010 0 – force all active
measurements
1-32 force that
measurement only
Bus Message Count 1011 Read Only
Bus Comm Error 1012 Read Only
Server Exception Count 1013 Read Only
Server Message Count 1014 Read Only
Broadcast Message Count 1015 Read Only
Char Overrun Count 1016 Read Only
*Note: When forcing a measurement, be sure to wait the proper amount of time for a measurement to
finish before requesting data.
Input Registers
Input registers return the last measured data from the device. Ideally these values should be requested on
a schedule slightly lagging the measurement schedule on the station. This will ensure data will follow that
found in the log. If the last measured data is not acceptable, a live reading can be forced by writing to the
Force Measurement (1010) holding register. Care must be taken to allow enough time to pass for taking a
measurement before requesting the data.
Since the system works with floating point numbers and Modbus only allows for 16-bit registers, a
multiple register read can be used to access the entire reading. The Modbus client device should be
configured to treat these reads as a single floating point number. For example, if accessing Last measured
via an Xpert, read 1 value of type float starting at register 1. The complete list of registers and their
locations are below.