
Volume Conversion Device EK260
82
Elster GmbH
3.12.3 Modbus parameters
AD
Designation / value
Unit
Access Address DC
MBDir
Data direction
-
S
2:7B0
7
MBTrM Transmission mode
-
S
2:7B1
7
MBAdr Device address ("slave" address)
-
S
2:7B2
8
(Legends: see page 22)
In the mode Md.S2 = 13 the Modbus protocol is available via the permanently wired
interface. Values can be read and changed and the measurement period archive can be
read out.
The functions "Read holding registers" (3), "Read Input Registers" (4), "Preset Single
Register" (6) and "Preset Multiple Registers" (16) of the protocol are implemented.
Reading out via the Modbus is described in separate documents from Elster GmbH.
External power supply is required for the EK260 for the Modbus communication and at
least one readout time window must be open. In the interface list "Ser.IO" (
→
3.12
) Md.S2
must be set to "13" and DF.S2 to "0" or "1" depending on the set transmission mode
MBTrM.
MBDir
Data direction
0 = The most significant word in the first register.
1 = The least significant word in the first register (affects only values with b inary
formats).
MBTrM
Transmission mode
0 = ASCII mode – The content of each register is transmitted as four ASCII
coded hexadecimal figures. DF.S2 must be set to "0".
1 = RTU mode – The content of each register is transmitted as two bytes. DF.S2
must be set to "2".
MBAdr
Device address ("slave" address)
Address of the EK260 for the Modbus communication.
Value range from 1 to 247 (0 = "Broadcast").
MAd1 … MAd40 Addresses for MODBUS Registers 1 to 40
There are 40 Modbus registers available for reading and writing values. Three
values must be set for the definition of each Modbus register: The Modbus register
address,
MAd...
, the corresponding LIS-200 address
LAd...
(EK260 address) and
the Modbus data format code
Fmt...
.
The Modbus register addresses can take on values from 1 to 65536.
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