Honeywell EK280 Applications Manual page 176

EK280
d) The following Modbus parameters are set by default via parameter file ( paragraph b) of this
chapter):
Short
Description
Desc.
MBTrM Transfer mode
MBDir Data direction
Device address
MBAdr
(Modbus Slave ID)
MBRSz Register size
MBAMd Addressing mode
Addressing mode
The Modbus addresses parameterized in the device are assigned according to logical addressing.
Depending on the retrieval software used, it may be necessary to change the addressing in the protocol to
physical addressing.
0 = Logical addressing of the Modbus registers with addresses starting with 1.
1 = Physical addressing of the Modbus registers with addresses starting with 0.
Querying the registers according to the addressing mode must take this into account as follows:
Value as per table below
301
User-determined value
43
Application Manual
Address Value
0: ASCII - The content of each register is
transmitted as four ASCII-encoded hexadecimal
digits
2:7B1 1 1: RTU - The content of each register is
transmitted as two bytes
2: TCP - Transmission as for RTU mode with
additional information for Modbus TCP protocol
0: H word first  The most significant word is
located in the first register
2:7B0 1 1: L-Word first  The least significant word is
located in the first register
(the Byte order is always High Byte first).
1 43 Value range from 1...247 (0 = "Broadcast")
2:7B2
2: Register size 2Byte
4 Register size 4 Byte
The statement of the register size has a direct
2:7B8 2
influence on the possible register address in the
above Modbus table. Hence the setting of the
register size applies to both interfaces!
0: Log. Mode (staring with "1")
2:7B9 0
1 Phys. Mode (staring with "0")
Table 2: Default Modbus parameter
Addressing mode
MBAMd
"0" (logic  Offset of "-1")
"1" (physical)
Table 3: Modbus Addressing mode
Content
Queried value
(Register)
"300"
"301"
174