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Draft, ne pas diffuser Wed Dec 05 2018 12:41:51 GMT+0100 (Romance Standard Time)
20
4.1
Functional description
The information found here is the basic information
needed for the installation of a Modbus system.
4.2
Implementation class
The physical and data link layer are implemented
conforming to the "basic slave" implementation class
as described in document [2] "MODBUS over Serial Line
specification and implementation guide V1.02".
The following options have been implemented:
Table 2
Modbus Parameters
General settings
Parameter
Addressing
Baud rate
Parity
Data bits
Stop bits
Electrical interface
4.3
Supported Modbus functions
This section describes the supported Modbus function
codes.
4.3.1
Read Registers (03, 04)
Both function 03, Read Holding Registers and function 04,
Read Input Registers, can be used. The addresses are the
same.
Table 3
Read Exceptions
Possible exception responses
Code
02
ABB
ARC GUARD SYSTEM™ – T VOC-2- COM MODBUS CONFIGUR ATION MANUAL
Options
address configurable 1-248 (default 248)
9600
19200 (default)
38400
57600
none
even (default)
odd
8
1 (default)
1.5
2
RS485 2W cabling
Name
ILLEGAL_DATA_ADDRESS
Remarks
When set to 248, the communication is
disabled.
Not configurable.
The use of no parity requires 2 stop bits.
Meaning
Address refers to a register that is not available
or not readable.
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