These devices can be connected in different ways:

• Using the distributed I/O system
  - SIMATIC ET 200M with the HART modules
  - SIMATIC ET 200iSP with the HART modules
  or with analog modules 4 to 20 mA and a HART handheld communicator
• Using a HART modem, with which a point-to-point connection is established between the PC or engineering station and the HART device
• Using HART multiplexers, which are contained in the HART server of the HCF