
Chapter 4: OE2CIH and HART 4-17
User’s Manual Pub. 0300272-01 Rev. A.0
HART Pass-through “Reason Code” definitions
The HART Pass-through Reason Code is a value that is reported when a Pass-through
reply message returns the general Status value as DR_DEAD(35). It provides you with a
diagnostic code to look up more detail on why the pass-through message failed. This
code is returned in Offset 3 of the reply message for Pass-through Init or Query messages
whenever the Status value at Offset 0 is set to DR_DEAD(35).
Table 4-12 HART Pass-through Reason Codes
HART Pass-through Reason Code
No response from HART device
Invalid long frame address
Only applies to FULL-HART
format
Invalid HART message checksum
Only applies to FULL-HART
format
HART Command not allowed (blocked by
module)
Only applies to Ladder Pass-
through
Channel is not HART-enabled
Channel needs to be configured
for HART
Channel does not have a device connected
Module has not established
HART communications on this
channel
Size of CIP message too small to hold size of
HART message
Module looks at HART Data size
field in request, and validates that
the incoming CIP message size is
large enough to send all the data
Only applies to a Query message
Only applies to FULL-HART
format
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