Protocol : ABB - ZM20


 

Parameterization :

CDE adapter :

Modulation mode :

Transmission rate :

Data byte / cyclic :
 

Tolerance limit :

PC-TxT level :

Modulation :

Message gap :

Parity :

Switch Setting  PDM

Digital-pulse-duration-modulation 

50 - 1200 baud

Number of bytes following the two synchro words
( equipment specific constant ) 

0  - 50%

+12V / -12V

3.0 ( variable )

6.0 ( variable )

odd ( variable )

Telegram structure :

First a start pulse is sent followed by the following TDB-Buffer-contents MSB_FIRST

Control direction : - 13 signs telegram length
First start pulse ,
followed by address block                              ( 2 out of 7 code )
and finally one command word                      ( 2 out  of 5 code )
Monitoring direction : - 17 signs telegram length
First start pulse ,
followed by address block                              ( 2 x 3 bit )
the information block                                       ( 8 bit )
one switch bit and one control sign

The group-address transmitted in the telegram is to be interpreted as matrix , with which in each case for "line" and "column" 1 to 8 will be input by editing. In the telegram however "line - 1"or "column - 1" is set aside.

With the screen output the value contained under "Address" in the telegram is shown decimal ( 0 to 63 ) .

The start pulse has a length of 6 short signals.

Particular features

If "no" is entered at the parity check , only the number of monitoring bits set even are made odd when creating the check character.

Transmission errors

*F:Blocklength : Telegram is too short or too long.
*F:Startpulse : Wrong start pulse.
*F:Timetolerance :
The received signal cannot be identified clearly. ( => Parameter tolerance limit in LIAN )
*F:2out of 5-Code : The address block is faulty.
*F:2out of 7 -Code : The command word is faulty.
*F:Hammingcode : The control sign is incorrect ( message ).

 


MAYR Software

Wuerzburger Ring 39,  D 91056 Erlangen

Manual LIAN DOS


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