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

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

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)
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 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)
1
3
5
7
9
HIT-4U
Read holding registers
Preset Boolean (for Enron event record
acknowledgement
Write Commands
Description
Clear Event
Logs
Clear Hourly
Logs
Clear Daily
Logs
Clear Grand
Total
Clear Total
Modbus Communications
Description
Byte Count
2
4
4
8
Data Access
Type
U16 RO
U16 RO
U16 RO
U16 RO
U16 RO
Register Count
1
1
*1 or 2
*1 or 4
Notes
Send a read request
to this register to
clear Total
HP-327
35