KROHNE BM 100 HART - Manual (Page 4)

BM100 Remote Operation - HC 275 / AMS
Dev.-Rev. EE, DD-Rev. 03
© 2000 KROHNE Meßtechnik D-47058 Duisburg Page 4
3 HART® Communicator 275 (HC275)
3.1 Installation
The HC275 has to be programmed with the BM100 HART® Device Description (DD). Otherwise
the HC275 user will work with the instrument as with a generic one thus loosing opportunity for
entire instrument control.
3.2 Operating
Refer to the BM100 Menu Tree HC275 (Attachment A).
The BM100 operation via HC275 is made quite close to the manual instrument control via keypad.
The differences follows:
•
The instrument write protection (parameters “Entry Code 1”, “Code 1”, menu items 1.4.2, 1.4.3
of the „Installation and Maintenance Manual. Reflex-Radar BM100”) is changed via invocation
of “Entry Code” method (item 3 ➪ 1 of the HC275 Menu Tree).
•
To “open” service functionality the user has to register as specialist. To do this, one should
invoke the “Service Code” method (item 3 ➪ 2 of the HC275 Menu Tree) and enter the correct
service password. After the HC275 is switched off (or the same method is invoked with
improper service password) specialist authorization is lost, and all service parameters/functions
again become inaccessible.
•
The two functions that are not accessible via instrument keypad but can be activated remotely
(recently – only by PC-Star application), namely “Measure Pulses” and “Linearity Calibration”,
are placed into “Configuration/Test” submenu (items 2 ➪ 1 ➪ 8 and 2 ➪ 3 ➪ 4
correspondingly).
•
The BM100 HART® transmitter makes it possible for the user to open a temporal session with
SMART protocol (say, to configure instrument via PC-Star). The protocol switch is undertaken
after invocation of “Switch to PC-Star” method (item 2 ➪ 1 ➪ 6 ➪ 3 of the HC275 Menu Tree).
After timeout (45 min) is expired or power on reset is performed, the instrument is turned back
to HART®.
•
For additional details refer to the „HART® Smart Communications Protocol. BM100 Reflex-
Radar. Transmitter-Specific Command Specification“.
3.3 Known HC275 (4.6) Shortcomings
When the “Save” operation is activated with the “Full (for PC)” data type chosen, HC275 loops
forever attempting to retrieve instrument Service Data. The loop can be avoided if the user has
registered as specialist in advance. With alternative data type (“Standard”) such preliminary
registration is not necessary.