Elgas DATCOM, Руководство по эксплуатации

Страница: 165 / 228

11
Function Description
163
The device is protected against unauthorized manipulation (especially with data that affect the
metrological characteristics of the device) with a metrological and service switch and uses
password system security. Changes to the device settings and other operations are stored in the
settings archive. These measures make it possible to protect the device both in accordance with
and beyond standard CSN EN 12405-1.
11.6.1 Protection Switches
The device contains two switches, a metrological switch and a service switch.
11.6.1.1 Metrological Switch
- Protects the metrological setting of the device. It is located on the inside of the enclosure cover
(see Fig. 54 and Fig. 55) and is protected by plate secured with the manufacturer’s seal (official
metrological mark).
11.6.1.2 Service Switch
- The service switch is located beneath the metrological switch (Fig. 54 and Fig. 55). Opening the
device and the switch accessibility can be protected with the user mark, see Fig. 4, Fig. 5.
The
service switch function depends on the settings in the device parameters. The settings are
done via the utility program (Parameters Menu -> Service Switch Function). Here, the user can
choose what effect the switch settings will have on each device parameter group.
This variability resolves the setting of various access options to work with the device (e.g. remote
setting of the parameters via the modem ...).
Using the utility SW, the user can select one of the following functions for the service switch:
Switch
function
Position Description
Full
25
)
OFF Writing parameters into the device is blocked.
ON Parameters can be entered into the device.
Non OFF The position of the switch is of no significance, writing to the device
is possible. The switch protection has been overridden.
ON
Partial OFF Writing to the device is blocked with the exception of non-
metrological parameters (such as archiving frequency, system time
etc.)
This setting is suitable for remote data transfers from the device.
Protecting the setting with a password is recommended.
ON Parameters can be entered in the device (in the same way as in the
case of full function).
Table 31 Service Switch Settings
11.6.2 Passwords
The device has password protection implemented. The use of passwords may be restricted
depending on the communication protocol set. Maximum number of passwords that can be
entered in the device is 50. When the password protection in the device is turned on (see below),
the passwords must be used both for serial line or modem communication and for setting device
25
)
This function has been pre-set by the manufacturer (default setting).