2.2 HART Protocol Specifications
The following is a list of HART protocol specifications. The specifications outline how HART devices respond to
commands and describe the physical layer of the protocol.
• HART Communication Protocol Specification (HCF_SPEC-13 FCG TS20013)
• FSK Physical Layer Specification (HCF_SPEC-54 FCG TS20054)
• Token-Passing Data Link Layer Specification (HCF_SPEC-81 FCG TS20081)
• Command Summary Specification (HCF_SPEC-99 FCG TS20099)
• Universal Command Specification (HCF_SPEC-127 FCG TS20127)
• Common Practice Command Specification (HCF_SPEC-151 FCG TS20151)
The specifications above can be viewed online at the FieldComm website but cannot be downloaded by non-
member companies. The specifications can be purchased as a bound book. Member companies can download
an electronic copy in a PDF. Companies purchase membership from the FieldComm Group.
2.3 HART Test Specifications
The following is a list of HART protocol test specifications. These test specifications describe the details of HART
testing for the different layers of the protocol. The test specifications describe how the tests are constructed and
what different test failures look like.
• FSK Physical Layer Test Specification (HCF_TEST-2 FCG TT20002)
• Token-Passing Data Link Layer Test Specification (HCF_TEST-1 FCG TT20001)
• Universal Command Test Specification (HCF_TEST-3 FCG TT20003)
• Common Practice Command Test Specification (HCF_TEST-4 FCG TT20004)