Xylem Sensus Modbus RTU - Page 4

User Manual
Modbus RTU
Option module for PolluTherm
M H 6123 INT, page 4
Designation Modbus
Register
Modbus
Register Type
Modbus
Address
Data Value
Range
Unit
1
Read only (RO)
Read/write (R/W)
Fabrication
Number
30056 or 40056 Input or Holding 55 8 char ASCII - RO
Customer
Location
30060 or 40060 Input or Holding 59 Int32 - RO
Customer
Location
30062 or 40062 Input or Holding 61 8 char ASCII RO
Modbus
Slave ID
3,4
41001 Holding 1000 UInt16 - R/W
Update Rate
Data from
Meter
5
41002 Holding 1001 UInt16 100 ms R/W
Baud Rate 41003 Holding 1002 UInt32 - R/W
Data Bits
6
41005 Holding 1004 UInt16 - R/W
Parity
6,7
41006 Holding 1005 UInt16 - R/W
Stop Bits
6
41007 Holding 1006 UInt16 - R/W
1
Units for Energy, Volume, etc. are available in (Unit) registers and apply to (Float) values as well as
integer values multiplied by (Unit factor).
Example on Energy registers - assume Energy = 43, Energy (Unit factor) = 100, Energy (Unit) = “Wh”,
Energy (Float) = 4300, then:
Energy register * Energy (Unit factor) register in Energy (Unit) register = 43 * 100 Wh = 4300 Wh
Energy (Float) register in Energy (Unit) register = 4300 Wh
2
Higher byte of the register is major number of firmware version (0x##00). Lower byte of the register is
minor number of firmware version (0x00##).
3
Lower byte of this register is Modbus address of the module in the range 1-247 (01-F7 hex).
4
If the higher byte is set to 1, the Modbus address will be updated to the heat meter M-Bus address.
If the higher byte is set to 0, the Modbus address is static.
5
Default Update Rate Data from Meter is 4 seconds. Value in Modbus register is 40 because 40 * 100
ms gives 4 seconds.
6
The registers should be set only the values represent data format on the EIA-485 serial interface
described in chapter Communication interface above.
7
This register is set by the ASCII char value – ‘E’ for Even parity (69 dec, 45 hex), ‘O’ for Odd parity
(79 dec, 4F hex) and ‘N’ for None parity (78 dec, 4E hex).
More details about Modbus communication and data decoding you find in Modicon Modbus Protocol
Reference Guide and MODBUS over Serial Line - Specification and Implementation Guide documents.