User guide
eWON 500-2001-4001-4002 User Guide - eWON Configuration
eWON 500®2001®4001®4002® Version 4_3_0 - User Guide - 10/5/05 - ©ACT'L sa - Page 52
4.3.8.3 Communication Configuration
4.3.8.3.1 Overview
The communication configuration needs to be saved in a distinct block in order to allow formatting any other data in the eWON without risking to
loose contact with the device (Ethernet IP address, PPP configuration etc.).
This configuration uses a fixed memory size and is stored with a special mechanism that prevents loosing configuration even is power is lost at
any time during the configuration update.
The only risk is to loose the last modification made after last save occurred.
Communication Configuration consists in all the configuration information that appears in the ComCfg.txt file.
4.3.8.3.2 Partitioning configuration
Communication configuration uses a fixed memory size.
4.3.8.4 /usr partition
4.3.8.4.1 Overview
This partition uses a different file system, allowing to create a larger number of files and to use a larger total flash memory.
This file system is also very robust in case of power lost during the time when operations are performed on the files.
This partition can be used through the eWON’s FTP server or using the eWON’s BASIC scripts.
If the /sys partition does not exists, the program and the configuration are then stored in this partition (see below: /sys partition).
4.3.8.4.2 Partitioning configuration
The size allocated to the /usr partition can be configured by the user (from 1 MB to 3 MB).
4.3.8.5 /sys partition
4.3.8.5.1 Overview
This partition uses the same file system as the /usr partition described above.
Its function is to store the program and the configuration.
Configuration includes all the configuration information that appears in the config.txt file.
When this partition is formatted, the configuration and the program are erased, but the current configuration and program are still in memory.
If the eWON is rebooted at that moment, it will use after restarting a default configuration and an empty program.
When the configuration or the program is saved, the eWON uses this partition to save a config.sys and a program.sys files.
These files are used internally by the eWON and should not be modified by the user.
4.3.8.5.2 Partitioning configuration
The size allocated to the /sys partition can be configured by the user (0 or 1 MB).
If the partition size is set to 0 MB, then the partition is not created, and all /sys data are saved in the "/usr" partition.
4.3.8.6 Storage size options
The following options are available for the storage configuration (see below Configure chapter).
Mode ID
\sys size
(MBytes)
\usr size
(MBytes)
Incremental Recordings
size (MBytes)
Nb IRC (number of points) Nb Events Nb Alarm
1-2-1 1 2 1 16384 762 8192
1-1-2 1 1 2 73728 762 8192
0-3-1 0 3 1 16384 762 8192
0-2-2 0 2 2 73728 762 8192
0-1-3 0 1 3 139264 762 8192
Table 29: storage size options list