Settings menu
Dräger Polytron 8700/8720 21
Switching the display test on or off
The function of the display and the LEDs is tested with
this function.
1. Select Settings > Instrument > Display > Displaytest
and confirm.
2. Select On or Off and confirm.
When this function is activated, the display is shown inverted
and all the LEDs are lit.
8.3 Communication settings
8.3.1 Settings for the HART interface (only for devices
with the optional HART interface)
This group contains the setting functions for the HART interface.
Setting the polling address
The polling address configures the device for analog operation
(4 to 20 mA) or multidrop operation. Analog operation (4 to
20 mA) is activated by setting the polling address to 0.
For multidrop operation the polling address must be
configured to a value between 1 and 15, which will result in the
analog interface being deactivated and set to a constant
current of approx. 1 mA. To allow the control unit to request the
Unique Identifier (unique HART address) with HART command
#0, all the devices on a line must be configured with different
polling addresses. It is advisable to choose a sequence
starting with 1 and incrementing continuously.
This setting corresponds to HART command #6 (Write Polling
Address).
1. Select Settings > Communication > HART interface >
Polling address and confirm.
2. Select the address line for the entry and confirm in order to
switch to the Change mode.
3. Set the polling address and confirm.
4. Select Confirm and confirm.
Displaying the Unique Identifier
This function enables reading of the Unique Identifier (unique
HART address), which has to be known for almost all the
HART addressing commands. However this information is only
required for those systems that are not able to read back the
Unique Identifier using HART command #0 in Short-Frame
Format or HART command #11. The display corresponds to
the address for HART command #0 (Read Unique Identifier) or
#11 (Read Unique Identifier associated with Tag).
z Select Settings > Communication > HART interface >
Unique Identifier and confirm.
The Unique Identifier is displayed.
Changing the measuring point name
The tag can be used to identify special devices. It can contain
up to 8 alphanumeric characters. The tag can also function as
an address for reading the unique identifier from the device
using HART command #11 (Read Unique Identifier Associated
With Tag), even when the polling address is unknown.
This requires that a unique tag has previously been configured.
1. Select Settings > Communication > HART interface >
Tag and confirm.
2. Select the tag line for the entry and confirm.
3. Set the tag and confirm.
4. Select Confirm and confirm.
Selecting Dräger REGARD
This function enables switching between different HART
protocols.
1. Select Settings > Communication > HART interface >
Dräger REGARD and confirm.
2. Select REGARD SW 2.0 or REGARD SW 1.4 and confirm.
8.3.2 Settings for the analog interface
The test and setting functions for the analog interface are
summarized in this menu.
Setting the fault current
This function is used to define the current for the fault signal on
the analog interface.
1. Select Settings > Communication > Analog interface >
Fault current and confirm.
2. Select the fault current line and confirm.
3. Set the currrent and confirm.
4. Select Confirm and confirm.
Switching the warning signal on or off
This function is used to switch the warning signal on the analog
interface on and off. If an existing warning is to be output over
the analog interface, the warning signal must be turned on.
During a warning, the current on the analog interface is
switched to the "Warning" status for one second.
The measurement is transmitted for the rest of the time.
The interval between warning signals and the analog signal
phase can be customized.
To switch the warning signal on or off:
1. Select Settings > Communication > Analog interface >
Warning and confirm.
2. Select On or Off and confirm.
Setting the warning interval
This function is used to set the interval between the warning
signals and the analog interface.
1. Select Settings > Communication > Analog interface >
Warning interval and confirm.
2. Select line T1 for the entry and confirm.
3. Set the time and confirm.
The setting for Time T1 is displayed.
4. Select Next and confirm.
5. Select line T2 for the entry and confirm.
6. Set the time and confirm each setting.
The setting for Time T2 is displayed.
7. Select Confirm and confirm.
NOTICE
REGARD SW 2.0 is the standard setting. REGARD
SW 1.4 must be set on REGARD controllers with
SW 1.4.
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