Copyright 2013 Baker Hughes Company.
128 | DPI620G Instruction Manual–English
Chapter 9. HART® Operations
9.8 HART® SDC Application Preferences
Tap the Preferences icon to set up the HART device search method.
The application lets a search be done by the use of:
• Poll Address - when each transmitter has a unique address.
• Short tag - if the transmitter supports 8-character tags.
• Long tag - if the transmitter supports 32-character tags.
Transmitters with a non-zero poll address are in multi-drop mode and default to a fixed loop
c
u
rrent of 4mA.
By default, the DPI620G polls address 0 (zero) only. Change the Poll Address by the selection of
th
e appropriate search radio icon or enter the tag name in the search field.
9.9 HART® Device Connection Failure
Fault Possible Cause Action
Failed to find
device.
Power Supply Make sure device is turned on.
Examine applicable fuses.
Make sure the supply voltage is within limits.
Device under Test Make sure the device is HART® compatible.
Connect multiple devices one at a time.
Circuit Examine circuit connections.
Examine circuit Continuity.
Make sure polarity of supply to the transmitter is correct.
Make sure the HART® resistor is in the correct place in the
loop.
Make sure the HART® resistor has the correct value.
Make sure the loop current is in the range 3.5mA to 24mA.
DPI620G Make sure the DPI620G connects to the correct points in the
loop.
No external HART® resistor present, examine the internal
resistor setting.
External HART® resistor present, make sure the DPI620G
resistor setting is OFF.
Make sure that the CH2 function is set to “None” if the
DPI620G is used as a secondary master (in parallel with an
external supply.
Preferences Select the “search 0-63” option to scan all possible Poll
Addresses to get the Poll Address and Tag details of the
connected device.
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