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Indactic 21 ISO/OSI Model
Supported Information Types
Protocol Features
Implemented Protocol Stacks
Applicable Products
References
The Indactic 21 protocol was developed in the eighties by the BBC
company (today ABB) in order to connect their RTUs and SCADA systems.
Indactic 21 encodes the data in a proprietary PCM code. It uses a
synchronization signal with a pulse of 1.5 length (i.e. 1.5 / baud
rate) to ensure unambiguous recognition of the telegram start. In practice baud
rates between 200 and 600 Baud are used. And although these baud rates are quite
low, the data volumes transmitted can be relatively large, as the encoding is not
burdened with unnecessary information.
There are several protocol dialects, so the actual function scope may vary.
Spontaneous transmission of information changes by a
substation without an explicit request or polling by the master is quite rare.
Additionally, the positive summary acknowledgment is applied, where the master
acknowledges all telegrams received in the meantime in regular specified
intervals in one go.
ISO/OSI Model
| 7 |
Application Layer |
Indactic 21 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 |
Double Command | | Monitoring Direction |
Single indication [1 Bit] | | Double indication [2 bit] | | Measured value [8 bit] unipolar | | Measured value [8 bit] | | Measured value [9 bit] | | Measured value [11 bit] | | Tap position BCD | | Counter value dual [8 bit] | | Counter value dual [16 bit] | | Counter value dual [32 bit] |
Protocol Features
| Physical Layer |
RS232 / V.24 (PCM) PtP
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| Application Layer |
Transmission of pulse commands
Spontaneous transmission of Indications, Measurands and Counters
General Interrogation
Grouped interrogation of Indications, Measurands or Counters
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| Address Space |
Station Address: 1..127
Information Type: as defined in protocol description
Group Address: 0..127
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Implemented Protocol Stacks
Applicable Products
 | ipConv | Universal protocol converter for highest degree of flexibility
Details...
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References
 | Interconnection BAGZV, EWAG
Details...
| Germany | ipConv | Indactic 21, Master / IEC 60870-5-101, Slave / |
 | RWE Eller
Details...
| Germany | ipConv | Indactic 21, Master / IEC 60870-5-101, Slave / |
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