Appendix A. Hart Command - ICP DAS USA ICP CON GW-7557 User Manual

Appendix A. HART Command

We extracted parts of the HART universal command here.
Command 0: Read Unique Identifier
Request data bytes: none
Response data bytes: 2+12 = 14
Index format description
Byte 0: uint8 Response code 1
Byte 1: uint8 Response code 2
Byte 2: uint8 254
Byte 3: uint8 Manufacturer ID
Byte 4: uint8 Manufacturer's device ID
Byte 5: uint8 Number of preambles needed in the request
Byte 6: uint8 Command set revision number
Byte 7: uint8 Transmitter specific revision code
Byte 8: uint8 Software revision
Byte 9: uint8 Hardware revision
Byte 10: uint8 Flags
Byte 11~13: uint24 Device ID number (MSB first)
Command 1: Read Primary Variable
Request data bytes: none
Response data bytes: 2+5 = 7
Index format description
Byte 0: uint8 Response code 1
Byte 1: uint8 Response code 2
Byte 2: uint8 Unit code
Byte 3~6: float Primary Variable
Command 2: Read P.V. Current and Percentage of Range
Request data bytes: none
Response data bytes: 2+8 = 10
Index format description
Byte 0: uint8 Response code 1
Byte 1: uint8 Response code 2
Byte 2~5: float Primary Variable Current
GW-7557 PROFIBUS/HART Gateway User Manual (Version 1.00, Dec/2011) PAGE: 75