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6. Configuring the Gateway
Name of the Modbus command
Modbus quer
y
! Frame "
Slave no.
Function no.
No. of the 1st word
(
MSB / LSB
)
Number of words
(
MSB / LSB
)
Numbe
r
of b
y
tes
…Values of the words
(
MSB/LSB
)
…
CRC16
(
LSB
/
MSB
)
Modbus res
p
onse ! Frame "
Slave no.
Function no.
No. of the 1st word
(
MSB / LSB
)
Number of words
(
MSB / LSB
)
CRC16
(
LSB / MSB
)
Name of the Modbus command
Modbus quer
y
! Frame "
Slave no.
Function no.
No. of the 1st word
(
MSB / LSB
)
Number of words
(
MSB / LSB
)
CRC16
(
LSB / MSB
)
Modbus res
p
onse ! Frame "
Slave no.
Function no.
Numbe
r
of b
y
tes read
…Values of the words
(
MSB/LSB
)
…
CRC16
(
LSB / MSB
)
N.B. in all cases, the “Query / Slave Address” and “Response / Slave Address” elements are automatically
updated by AbcConf according to the node in which the command is located. Their values cannot be changed by
the user. In the same way, the “Query / Function” and “Response / Function” fields depend on the nature of the
Modbus command and cannot be changed by the user.
The operations to be carried out are more or less the same as those consisting of changing the default
commands. For the “Read Holding Registers” command, please see chapter 6.8.1 Replacing a periodic input
data element, page 52, and chapter 6.8.3 Increasing the Amount of Periodic Input Data, page 54. For the “Preset
Multiple Registers” command, please see chapter 6.8.2 Replacing an Output Periodic Data Element, page 53,
and chapter 6.8.4 Increasing the Amount of Periodic Output Data, page 58.