Save Changes Save changes to non-volatile memory. The module will need to be restarted before
the changes take effect.
Save Changes and
Reset
Save settings to non-volatile memory, and reboot the WI-MOD-xxx-E-5W
module. Once the module has completed the reboot sequence, all changes are
in effect.
Data Compression
The radios incorporate a data compression algorithm based on RFC1951 specifications. This algorithm is similar
to the one used in file compression utilities, such as PKZip, which simply matches duplicate strings within the
data frame with pointers to previous data patterns. The algorithm keeps a running image of previous received
data frames which it uses to compare with the current data frame. When it finds a data string that is the same
as a previous data string, a pointer to this location is sent instead of the data. Depending on the data, this could
considerably reduce the amount of data that needs to be sent.
Performance is dependent on the type of data frames that are being sent. Typical improvements in throughputs that
can be expected when compression is enabled are:
•
15
–40% improvement if using Modbus, depending on the radio baud rate
•
70% improvement for webpage download
•
40% improvement if using FTP download
4.7 Serial Configuration
Click Serial on the menu to configure the onboard serial ports. The WI-MOD-xxx-E-5W has one RS-232 port and
one RS-485 port available for serial communications with other devices. These ports are completely independent of
each other and can be configured for different functions and can even be used at the same time.
The WI-MOD-xxx-E-5W offers five port types. Each port is configured separately by selecting the port type from the
drop down list on the Serial Configuration page and then configuring the appropriate parameters.
The the five port types are:
•
Modbus RTU Master
—This type should be selected when the port is operating as a Modbus Master, that is,
when Modbus RTU slave devices are connected directly to the serial port. Modbus mappings will need to be
configured in the table provided. For details, see
“Modbus RTU Master.”
•
Expansion I/O
—This type should be selected when WEIDMULLER Serial Expansion modules (WI-
EX-IO-XX) are connected to the modem. For details, see
“Expansion I/O.”
•
Modbus RTU Slave
—This type should be selected if the port is being used as a Modbus RTU slave, that is,
the module it is being connected to/from a Modbus Master (such as DCS, or SCADA) via the serial port. For
details, see
“Modbus RTU Slave.”
•
Serial Gateway
—This type should be selected if you want to allow point-to-point or point-to-multipoint
transparent serial data transfers. For details, see
“Serial Gateway.”
•
Modbus TCP/RTU Converter
—This port type allows Modbus TCP to Modbus RTU conversion. For details, see
“Modbus TCP/RTU Converte
