Protocol : Landis & Gyr - TELEGYR 805/ 809
The protocol TELEGYR 805/ 809 is also available in the LIAN 98 Software,
|CDE adapter :
Modulation mode :
Transmission rates :
Data byte :
|switch setting PCM
100 - 57600 baud
8 bit ( variable )
even ( variable )
250 msec ( variable )
Because of the unusual telegram structure , which aims for maximum compression of the send data , several compromises had to be made when implementing in LIAN :
With the T809 , several different
"objects" can be packed together in one telegram ; In the
editing windows , this is achieved by an object list in which up to
eight different objects can be entered.
To facilitate analysis of the received telegrams , it is possible with the T809 to filter not only the telegram header but also objects. A telegram is allowed through only if at least one object comes through the filter and only these objects appear in plain text when outputting to screen.
|-Error check :||In addition to the error check described
below , the following errors can also be output to screen in plain text :
*Unknown IAC : The number of the object is unknown.
*Object length : The telegram is too short.
*Wrong number of v-bits : Appears , for example , if more than two v-bits are set with count values.
|As soon as an error of this kind is detected , plain text output is aborted because the data block is inconsistent|
|*F:BCCode:||The Telegram check sum is not correct.|
|*F:Blocklength :||The stop byte is missing or is not on the right place.|
|*F:TelFormat :||The telegram header of the 68H telegram is faulty.|
||Within a telegram , there may be no pause between characters. The sensivity of SIMO can be parameterized in LIAN.|
|*F:SYNC :||The receive routine looks for 68H , 10H or E5H. Every other character is given an asterisk '*' in SIMO and a synchronization error is noted against it in the protocol.|
|*F:Overflow :||Error message from the UART.|
|*F:Parity :||Error message from the UART.|
|*F:Start / Stop :||Error message from the UART.|
|*F:Hamming code :||The CRC is not correct with a pulse or persistent command.|
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LIAN DOS Protocol Simulator and Analyzer
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