Protocol : RWE - SDN


 

Parameterization :

CDE adapter :

Modulation mode :

Baudbrate :

Data byte :

UART FIFO :

Parity :

Time out :

switch setting PCM

pulse-code-modulation asynchronous

200 - 57600 baud

8 bit (variable)

No  ( Don't use FIFO )

none

8 msec (variable)

Synchronization

As the SDN has no telegram frame it may be difficult finding the telegram start. To guarantee a reliable synchronization, the time out between telegrams is evaluated. Therefore the time-out setting must be very low (default : 8 ms with 9600 baud). Lower settings cause also errors.

Simulation mode

The SDN has a simulation mode that needs at least two channels. Therefore the COM interfaces of the PC are used in pairs and must be connected as follows.The interfaces must be parameterized and connected as follows:

By entering 'rti' in the SIMO command window the program reacts as 'command transmitter', i.e. messages of the counter-station are acknowledged automatically (by Q1M or Q3M in case of error). All commands entered by means of 'ss', 'sm' or 'sz' in the transmission list, are suppressed as long as the counter-station's command acknowledgement for the last transmitted command has arrived. This transmission blocking is raised by entering 'rti free'. By calling up 'rti' again the simulation mode is ended.

By entering 'rtu' in the SIMO command window the program reacts as 'message transmitter', i.e. commands of the counter-station are acknowledged automatically (by Q1B or Q3B in case of error). All messages entered by means of 'ss', 'sm' or 'sz' in the transmission list, are suppressed as long as the counter-station's message acknowledgement for the last transmitted message has arrived. This transmission blocking is raised by entering 'rtu free'. By calling up 'rtu' again the simulation mode is ended.

Transmission errors

*F:CHARtimeout : The period of transmission exceeds 10 msec (with 9600 baud).
*F:Blocklength : Error telegram length
*F:TelFormat  : The acknowledgement consists of an invalid character
*F:TimeOut : Within a telegram there may be no pause between characters. The sensitivity of SIMO can be parameterized in LIAN
*F:Hammingcode : The security supplement of the telegram is incorrect.
*F:Overflow : Error mesage by UART
*F:Parity : Error mesage by UART
*F:Start / Stop : Error mesage by UART

 


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.