Protocol : ABB - Indactic 21


Parameterization :

CDE adapter :

Baud rate :

Modulation mode :

Data format

Hamming distance t/r

Tolerance limit

PC-TxT level

Acknowledge (AT1)

Request (AT1)

End message  (AT0)

switch setting  PDM because of synchronous transmission

50 - 4800 baud

pulse-code-modulation synchronous

AT 0, AT 1

4 / 4
Polynomial : (x7 + x6 + x2 + 1 ) 7 bits 



yes/ no

yes/ no

yes/ no

Data record structure :

At the beginning of the telegram, SIMO searches for the synchronization characters (1, 1.5*0, 1, 0 ). All other bit patterns are entered as synchronization errors in the protocol.

The filter "Common address" refers to the instruction mode in case of commands. (see data record structure ABB-Indactic 21 )

Simulation :

Via the command "rtu <station address>" or "rti <station address>" in SIMO in the window "SendTelegramm" you can start the simulation. With the data format AT1 the parameter "node" can be declared additionally ( "rti <node> <station>" ). Is no parameter  declared,  the settings of the program LIAN are taken on. All telegrams to be sent are attached with the node- / station address.

Please note that the following settings are implemented in the program LIAN before a simulation can be activated.

RTU-Simulation with data record  AT 0

Simulation of the SUBSTATION  !  ( node <-> substation )
buffer number status telegram : TDB-BUno 
  The status telegram is transmitted  with a  general interrogation  to the master station
buffer range  for messages : TDB-BUbeg to TDB-BUend
  Messages are transmitted with a general interrogation to the master station
buffer range  for measurands: TDB-BUend to TDB BUend
  Measurands are transmitted with a  general interrogation to the master station
buffer number end telegram : TDB-BUno
  The endTelegram is transmitted at the end with the transmission of the current telegram counter to the master station.
buffer number for acknowledgment to pulse command: TDB-BUno
  A pulse command is signed after receipt with this reflection message. Common block and IB0 are entered dynamically.
buffer number for acknowledgment to pulse command : TDB-BUno
  With this message the change of the switch position is sent to the master-station after receipt of the pulse command. The InfoBytes must be defaulted accordingly.

RTI-simulation with data format AT 1

 Simulation of the MASTERSTATION ! ( Master station <-> node )
buffer number acknowledgement : TDB-BUno

With the receipt of an end-message with Q = 0, KN = 0, ST = 0, Gr = 63 and ANF = 1 in IB0 an acknowledgement is sent. This acknowledgement contains Q = 1, KN = 0, ST = 0 and the number of telegrams received by the node.

Of course, the declared TDB-buffers have to be edited with the corresponding telegrams (program TEDP ) !

Please take further procedure for the simulation of the Indactic 21 description.

Bit shifter

In SIMO you can activate a bit shifter via the command 'bs'. It enables you to set a bit, a double bit or the BMK conveniently into the information block of the relevant message. When exceeding the information area the address block is automatically increased or reduced. The Bit shifter works only with single bits , double bits and pulse commands.

In the window 'bit shifter' you can use the following commands:
[1-9] define interval n (not in case of pulse commands)
[arrow-right] n bit/ double bit to the right (or increase BMK)
[arrow-left] n Bit/ double bit to the left (or decrease BMK)
[arrow-up] increase common block by 1
[arrow-down] decrease common block by 1
[S] send message
[ESC] quit entry mask
It should be taken into account that the bit shifter changes the address block and the information block; previous settings are lost. 

Transmission errors

*F:TelFormat  The format byte with the telegram length includes an invalid value.
*F:TimeTolerance  The measured character length is beyond the tolerance set in LIAN. 
*F:Parity Parity error
*F:HammingCode Check code was incorrect
*F:EndCharacter The last character in the telegram is not equal to 0


MAYR Software

Wuerzburger Ring 39,  D 91056 Erlangen


LIAN DOS Protocol Simulator and Analyzer
© Copyright 1991, 1996, 2001, 2006-2010 by Werner Mayr. All Rights reserved.