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GI74

DOWNISO/OSI Model
DOWNSupported Information Types
DOWNProtocol Features
DOWNImplemented Protocol Stacks
DOWNApplicable Products

GI74 is a proprietary communication protocol that was first produced in 1974; however it has been retained due to the fact that it has proven reliable in service and replacement part have been easy to obtain.

ISO/OSI Model

7 Application Layer GI74 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 RS232 / V.24 (PCM)

Supported Information Types

Control Direction Single Command
Monitoring Direction Single indication [1 Bit]
Double indication [2 bit]
Measured value [8 bit]
Measured value [11 bit]
Tap position [5 bit]

Protocol Features

Physical Layer PCM, half-duplex, 23 bit data words
1 start bit, 16 data bits, 5 CRC bits, 1 stop bit
Application Layer Block or word interrogations of indications and measured values
"Select before operate" transmission of commands
Address Space RTU address 1..255 depending on length (from 5 to 8 bits)
Function address 0..15
Block address 0..7
Word address 0..7

Implemented Protocol Stacks

GI74, Slave

Applicable Products

ipConvipConvUniversal protocol converter for highest degree of flexibility
Details...
product/ipConv/en/ipConv_en.pdf
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