Parameterization

 

Baud rate

Number of the transmitted bits or short signals (PDM) per second.

Blocking time

Period of time that is to pass between the transmission of two telegrams

Data byte

Number of data bits in a data record.

Hammingdistance

Number of troubled bits in a code word that cannot be recognized as error, i.e. at a hamming distance of n, n-1 troubled bits can be recognized.

Message gap

When measuring digitally the duration of pulse modulation a message gap, besides short and long signals is given usually. The message gap represents the minimal time between two telegrams. The value in this field defines the length of the message gap in ratio to the short signal, e.g. a value of 6.6 would mean that the message gap is 6.6 times longer than the short signal. In SIMO the message gaps are recognized in a range of -10 % to +50 % and displayed on screen with "SZ". When parameterizing make sure that the lengths of short and long signals and message gaps do not overlap.

Parity

A simple means for ascertaining transmission errors. The data block to be saved is always completed by parity bits to an even (even parity) or uneven (uneven parity) number of set bits.

PC-TxT-level

Tension on the data line when there is no transmission.

The current level can be recognized at the CDE adapter at the diodes under TxD :

Red       :            -12V
Green  :            +12V

Ratio of modulation

Factor determining the ratio of short signals (basis) to long signals.

Signal information

Gives an overview over the signal-specific transmission parameters

Correction ticks Number of timer ticks being subtracted from the single pulses during transmission (the first value refers to change of slope) in order to avoid disturbances at higher baud rates.
Length short signal Pulse duration in milliseconds being interpreted as short signal
Length long signal Pulse duration in milliseconds being interpreted as long signal. This size derives from the length of the short signal and the ratio of modulation.
Length of messge gap Pulse duration in milliseconds being interpreted as message gap.
Ratio of modulation Ratio of the length of the long signal to the length of the short signal.
Recommended baud rate:

Result of the Calibrate-routine (command 'cal') in the program SIMO. This not binding value gives the approximate maximum baud rate with which a trouble free transmission is still possible.

Spike Pulse duration in milliseconds being interpreted as spike (tension peak).
Tolerrance limit Maximum drift of the pulse duration from the laid down time.

Start pulse

Ahead of the actual telegram a so-called start pulse (pre-pulse) is transmitted. Its length is parameterized in milliseconds. It is independent of the set baud rate.

Stop-bit

Marks the end of a data block.

Tape directory

Here you can declare a directory in which the telegrams recorded via the tape function are saved. The directory has to exist already.

Time-Out

A time-out is triggered if the time that may at most pass between the reception of two signals (or bytes with PCM) is exceeded. The triggering of a time-out does not necessarily have to mean that an error has occurred, as it occurs at the end of a telegram anyway.

Tolerance limit

Indicates by which period of time the measured length of an pulse may exceed or fall below the laid down length.

 


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Manual LIAN DOS


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