Vega VEGASCAN 693 Operating Instructions Manual page 25

Service - Access protec-
tion - DTM remote access
Service - Sensor address
VEGASCAN 693 • 15-channel HART signal conditioning instrument
6 Setup with the integrated display and adjustment unit
Note:
By activating the PIN, only parameter changes via the front side
instrument keyboard are locked. Via the interfaces and the respective
DTM, the complete access to the instrument is still possible. If you
want to stop this access, then the DTM adjustment can be completely
locked by activating a password. The activation of this locking only
possible via the DTM and not via the keyboard.
Instruments with RS232/Ethernet option can be protected against
wiretapping and manipulation of the data transmission from remote.
For this, activate under "DTM remote access" the encryption of the
data transmission. With active encryption, it is necessary to enter
once the instrument key (PSK) during connection for DTM access via
the Ethernet/RS232 interface. The instrument key is stored on the PC
and must not be entered again when connecting with this PC. Each
instrument is is provided iwth an individual instrument key consistong
of 20 capital letters. This key can be read out directly on the instru-
ment display in the menu "Info".
With every 4 ... 20 mA/HART sensor, the measured value can be
transmitted via analog current signal or digital HART signal. This is
regulated via the HART mode or the address. If a HART sensor is set
to address 0, the sensor is in the standard mode. Here the measured
value is transmitted digitally on the 4 ... 20 mA cable.
In mode HART Multidrop, an address from 1 ... 15 is assigned to the
sensor. By doing so, the current is fix limited to 4 mA and the meas-
ured value transmission is only made digitally.
Each sensor connected to VEGASCAN 693 must operate in mode
HART multidrop and must be provided with different addresses in
the range between 01 ... 15. Via the menu item "Sensor address", it
is possible to change the address of the connected sensor. For this
purpose, enter the previous address of the sensor (factory setting 0)
and in the next window the new address.
Note:
When addresses are being assigned, only one sensor with the same
address must be connected on the bus. If this is not the case, the sen-
sor cannot be accessed and it is not possible to assign an address.
25