Modbus Communications - Hoffer Flow Controls HIT-4L User Manual

6. MODBUS COMMUNICATIONS

HIT Com Software or a Modbus Master may be used to configure HIT-
4L, monitor process variables and obtain diagnostic information from
the HIT-4L.
Supported Commands
Function Code
(Hex)
03
05
10
Data Types
Data Type
Unsigned Int (U16)
Unsigned Int (U32)
Floating Point (FP32)
Double Precision Float (FP64)
* The variables Rate, Total and Grand Total, Temperature, Pressure
and Density 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 Description
(Decimal)
1 Clear Event Logs
3 Clear Hourly
Logs
5 Clear Daily Logs
7 Clear Grand
Total
9 Clear Total
32 Request Event
Logs
HIT-4L
Modbus Communications
Read holding registers
Preset Boolean (for Enron event record
acknowledgement
Write Commands
Byte Count
2
4
4
8
Data
Type
U16
U16
U16
U16
U16
U16
(2)
FP32
(4)
Description
Register Count
*1 or 2
*1 or 4
Access
RO
RO
RO
RO
RO Send a read request to
this register to clear
Total
RO
37
1
1
Notes
HP-329