Industrial
Electronic Devices
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User Manual
Modbus Slave / HART Master
Document code: MN67908_ENG Revision 1.001 Page 10 of 32
HART:
“HART” is an acronym for Highway Addressable Remote Transducer. The HART Protocol makes uses Frequency Shift Keying (FSK) standard
to superimpose digital communication signals at a low level on top of the 4-20mA. This enables two-way field communication to take place
and makes it possible for additional information beyond just the normal process variable to be communicated to/from a smart field
instrument.
It is possible to provide the current loop for HART communication and an additional low power supply @ 24 V DC for feeding HART devices
by setting Dip-Switch D at ON position.
Current loop for HART is required when there is not an external device in the bus that provides it.
