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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
1-16 force that
measurement only
Bus Message Count
1011
Read Only
Bus Comm Error
1012
Read Only
Slave Exception
Count
1013 Read
Only
Slave 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.
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