S88 feedback bus system

from Wikipedia, the free encyclopedia
S88 feedback module

The s88 feedback system is a technology for feedback in model railroad control .

history

The technology was originally developed for Märklin in the 1980s and got the name from its feedback module s88. Technically, this solution is rather simple and was therefore soon copied by various other companies. So this cost-effective solution spread very widely.

functionality

S88 feedback module from a third party with s88-N

Usually 16 (sometimes only 8) responses are possible per module. The modules are connected in series from the control center. A six-pole cable serves as the connection. A total of 31 modules may be connected, a limit that was set arbitrarily.

Technically, it is a long shift register that is constructed with simple CMOS components. During a reading process, the data is queried one after the other via all connected modules and made available for evaluation.

The addressing is done by the base address of the line and the position in the chain. The message is given with the address and the status "on" or "off".

The evaluation is usually carried out using a computer , to whose serial interface the modules are connected via the digital center or directly via an interface.

Due to the simple structure and the use of simple ribbon cables, the system is more susceptible to interference from outside influences. In the meantime, the common RJ-45 network cables are also used instead of the flat ribbon cables (standard s88-N). When laying, consideration should be given to other lines so that there is no crosstalk .

Web links

swell