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Hitachi HC4300

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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.

ISO/OSI Model

7 Application Layer HITACHI HC4300 Application Layer
6 Presentation Layer n/a
5 Session Layer n/a
4 Transport Layer n/a
3 Network Layer n/a
2 Link Layer n/a
1 Physical Layer SDLC framing
RS232 (V.24)

Supported Information Types

Control Direction Double Command
Monitoring Direction Single indication [1 Bit]
Single indication [1 Bit] with time tag
Measured value [12 bit]
Counter value [16 bit]

Protocol Features

Physical Layer PCM, half-duplex, SDLC frame format/synchronisation
Baud rates up to 2400
Application Layer 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
Address Space 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

HITACHI HC4300, MasterHITACHI HC4300, Slave

Applicable Products

ipConvLiteipConvLiteinexpensive protocol converter for standardized application
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ipConvPBSipConvPBSUniversal protocol converter with integrated PROFIBUS-DP, slave interface
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ipConvPBMipConvPBMUniversal protocol converter with integrated PROFIBUS-DP, master interface
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ipConvPNMipConvPNMUniversal protocol converter with integrated PROFINET-IO, master interface
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ipConvPNSipConvPNSUniversal protocol converter with integrated PROFINET-IO, slave interface
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ipConvipConvUniversal protocol converter for highest degree of flexibility
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References

ABBHTCABBHTC
Details...
IranipConv HITACHI HC4300, Slave / IEC 60870-5-101, Master /
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