The Hitachi HC4300 protocol was developed by HITACHI company for communication
between control stations and substations.
The physical layer is based on a SDLC standard format.
Hitachi HC4300 operates in half-duplex mode based on the master/slave principle.
While one master can communicate with up to 15 RTUs, each RTU only responds to
explicit requests from the master.
||HITACHI HC4300 Application Layer|
Supported Information Types
- Single indication [1 Bit]
- Single indication [1 Bit] with time tag
- Measured value [12 bit]
- Counter value [16 bit]
PCM, half-duplex, SDLC frame format/synchronisation
Baud rates up to 2400
on-demand transmission of analog and counter values
on-demand transmission and transmission on change of single point indications
transmission of single point indications with time tag
"Select before operate" transmission of commands
RTU addresses 1..15
binary indications: 3 groups with 16 words each. Each word contains 16 bit.
Measured values: 8 groups with 16 measured values each
Implemented Protocol Stacks
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HITACHI HC4300, Slave
IEC 60870-5-101, Master