Revision 8.1, Release Date: August 24, 1999 Page 3 of 88
HART Communication Foundation Document Number: HCF_SPEC-54
FSK Physical Layer Specification
Table of Contents
Preface ........................................................................................................................................11
Introduction .................................................................................................................................13
1Scope......................................................................................................................................14
2Normative References............................................................................................................14
2.1 Related HART Documents ....................................................................................14
2.2 Related Communication Documents ......................................................................14
2.3 Other Related Documents .......................................................................................14
3 Definitions .............................................................................................................................15
4 Symbols and Abbreviations...................................................................................................20
5 Physical Device Types...........................................................................................................21
5.1 Low Impedance Devices ........................................................................................21
5.2 High Impedance Devices .......................................................................................21
5.3 Device Connection Types .......................................................................................22
5.3.1 Current Input (Formerly Primary Master) ................................................23
5.3.2 Current Output (Formerly Type C Field Device) .....................................24
5.3.3 Voltage Input (New) .................................................................................24
5.3.4 Voltage Output (Formerly Voltage Mode Slave Device) .........................24
5.3.5 Secondary (Formerly Secondary Master
1
) ...............................................24
5.3.6 Transmitter (Formerly Type A or B slave device) ...................................25
5.3.7 Actuator (New) .........................................................................................25
5.3.8 Non -DC Isolated Bus (Formerly Type A slave in multi-drop mode
1
) ....25
5.3.9 DC Isolated Bus Device (Formerly Type D Field Device
1
) .....................25
6 Network Configuration Rules................................................................................................26
6.1 Definitions of Elements ..........................................................................................26
6.2 Combination of Elements .......................................................................................26
6.2.1 Rule Number 1 ..........................................................................................26
6.2.2 Rule Number 2 ..........................................................................................26
6.2.3 Rule Number 3 ..........................................................................................26
6.2.4 Rule Number 4 ..........................................................................................26
6.2.5 Rule Number 5 ..........................................................................................26
6.3 Example Topologies ...............................................................................................27
6.3.1 Point to Point Current Input ......................................................................27
6.3.2 Point to Point Current Output ...................................................................28
6.3.3 Multi-drop .................................................................................................29
