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SIA-D_
Rev. 07
80 / 117
ISO 9001:2008
9.2. Function codes
HEX
DEC
CODE
MODBUS
NAME
DEFINITION COMMENT
0x03
3
Read
Holding
Registers Reading of
Any Value This function allows the master to read 1 or more
consecutive addresses of a relay. The registers
always are of 16 bits, with the most important byte
at first. The maximum number of registers to be
read in a package are 60.
0x10
16
Preset
Multiple
Registers Script This function allows to write one or more registers
that represent one or more settings. The registers
are values of 2 bytes of length, transmitted with the
most important byte at first. The maximum number
of register to be written in a package is 60.
9.3. Exemptions and error answers
The error codes defined by the ModBus protocol are as follows
:
01
ILLEGAL FUNCTION The slave does not support any function with the
function code received in this message.
02
ILLEGAL DATA ADDRESS The master is trying to do an operation in a wrong
address.
03
ILLEGAL DATA VALUE The slave has detected that the value sent by the
master is not valid.
04
SLAVE DEVICE FAILURE Indicates an error occurred in the slave while trying
to execute the request of the master.
05
ACKNOWLEDGE Generic recognition.
06
SLAVE DEVICE BUSY The slave is busy and unable to perform the
required operation.
07
NEGATIVE ACKNOWLEDGE Generic non-recognition.