Spectrum Controls 1769sc-HART Modules - Manual (Page 99)

Chapter 7: Enabling and Using HART on the 1769sc-OF4IH
User’s Manual 0300217-03 Rev. A
7-33
DEAD will be sent back if any of the following conditions are true:
 Command or HART Channel number is invalid.
 HART channel is not enabled.
 HART communication has not been established, meaning that the 5-byte unique
address has not been determined yet.
 The channel is currently updating device information. Theoretically, pass-
through command can be safely accepted after successfully receiving Command
0, but for simplicity, we'll track update of the device information as a whole.
 All other conditioned not generating INITIATE.
After the pass-through response is sent with a valid handle and a response value
indicating (33) INITIATE, the user can retrieve the data associated with the handle using
the following command message.