Modbus Communications 35
HIT-4U HP-327
6. MODBUS COMMUNICATIONS
HIT Com Software or a Modbus Master may be used to configure HIT4U,
monitor process variables and obtain diagnostic information from
the
HIT-4U.
Supported Commands
Function Code
(Hex)
Description
03 Read holding registers
05 Preset Boolean (for Enron event record
acknowledgement
10 Write Commands
Data Types
* The variables Rate, Total and Grand Total are available as single 32 or
64-bit registers as well as multiple 16-bit registers.
Registers
Each register is labeled as Read Only (RO) or Read/Write (R/W)
according to access type.
Register
(Decimal)
Description
Data
Type
Access Notes
1 Clear Event
Logs
U16 RO
3 Clear Hourly
Logs
U16 RO
5 Clear Daily
Logs
U16 RO
7 Clear Grand
Total
U16 RO
9 Clear Total U16 RO Send a read request
to this register to
clear Total
Data Type Byte Count Register Count
Unsigned Int (U16) 2 1
Unsigned Int (U32) 4 1
Floating Point (FP32) 4 *1 or 2
Double Precision Float (FP64) 8 *1 or 4
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