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3.7.3
Modbus
Aranet PRO/PRO+ Modbus TCP/IP feature currently supports "
Input register
" object types. All other types
can be defined in the configuration file, but they will be ignored. It refers also to function codes. Only
function code 4 is supported (read "
Input register
").
Aranet PRO/PRO+ appears in Modbus networks as
server (slave)
having its own
server(slave) ID
. By
default, Aranet PRO/PRO+
server (slave) ID
is “1”.
Notes for client side:
•
Register size: 16 bits;
•
Endianness - big-endian with high word first:
o
high byte first;
o
high word first (for 2 register/32-bit values).
•
Supports only:
o
Modbus function: read input registers (code: 4)
o
Modbus data type: input registers (any address can be used in supported range: 0-65535)
•
Used Modbus TCP exceptions
o
In case if unsupported function is being requested, message with "ILLEGAL_FUNCTION"
code will be replied.
o
In case if unavailable registry address is being requested, message with
"ILLEGAL_DATA_ADDRESS" code will be replied. This exception is sent also in case if
address is colliding with any other registry address.
o
In case if uninitialized registry address is being requested, message with
"ILLEGAL_DATA_VALUE" code will be replied. Address of the registry exists, but valid
data of measurement has not been assigned yet.
Modbus
menu
is where you setup connection to Aranet PRO/PRO+.
1)
Enable
– allows enabling/disabling Modbus TCP/IP on Aranet PRO/PRO+ base station;
2)
Port
– allows selecting the TCP port used for the connection to the Modbus
client (master)
. The
most common port is 502.
3)
Default register layout
– autogenerated Aranet PRO/PRO+ Modbus addresses layout file in
json
format can be downloaded here. (
See layout file example below
).
4)
Use custom layout file
– when enabled, custom Modbus addresses
json
file can be uploaded to the
Aranet PRO/PRO+ base here as well as downloaded back from base station.
5)
Save
or
Cancel
changes.
Summary of Contents for PRO
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