Sub-Menu » Communication - Dräger Polytron 7500 Instructions For Use Manual

Sub-menu » Communication «
The sub-menu » Communication « permits various settings to by made for the inter-
faces.
HART interface
This group contains the setting functions for the HART interface.
– Polling address
The polling address configures the unit either for the analogue mode (4 to 20 mA) or
the multidrop mode. Setting the polling address to " 0 " enables the analogue mode
(4 to 20 mA). To enter multidrop mode, the polling address must be set to a value in
the range from " 1 " to " 15 ", which disables the analogue interface and freezes it to
a constant current of approx. 3 mA. In order to enable the central controller to
request the unique identifier (unambiguous HART address) using HART command
#0, all Polytron 7500s located on one cable trunk need to be configured with a dif-
ferent polling address. It is advisable to choose a subsequent series of addresses,
starting with address " 1 ".
This setting corresponds to the HART command #6 ("Write Polling Address").
Select the menu items » Settings «, » Communication «, » Hart interface « and
» Polling address « in this order, pressing the »
Use the » « and »
M
and press the » « key to confirm the setting.
OK
Press the » « key to confirm the complete polling address.
OK
– Unique Identifier
This function can be used to read out the unique identifier (unique HART address),
which must be known for the addressing in almost all HART commands. However,
knowledge of the unique identifier is necessary only for systems which are not able
to read out the unique identifier with the HART command #0 in the short-frame for-
mat or the HART command #11. The display corresponds to the address returned by
the HART command #0 ("Read Unique Identifier") or #11 ("Read Unique Identifier
associated with Tag").
Select the menu items » Settings «, » Communication «, » Hart interface « and
» Identifier « in this order, pressing the »
— The unique identifier will be displayed.
9023927 - 2nd edition - May 2007
« key after each selection.
OK
« keys to set each position of the polling address
« key after each selection.
OK
The menu » Settings «
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