method for asynchronous serial data transmission can be accessed in any order to speed and schaltungsanordnung

摘要

The equipment monitors or tests motor vehicles when operating on load. Faults are detected. In the vehicle is a microprocessor unit (15) which is connected to an input/output interface unit (18) with the vehicle sensors, and to a r.a.m. (16) and r.o.m. (17). Connection is by parallel signal bus (20) and control bus (19). Output across the transmitter-receiver interface (22) is by parallel/series converter (21) controlled by the processor (15). The receiver (28) feeds a series/parallel converter (27) which in turn supplies the v.d.u. (26) or other similar appts. Connection is either by one lead, in which case a start bit sequence of each transmitted word is used to synchronise the receiver, or by a two wire system in which the second wire (32) is used for synchronising the read out of the parallel/series converter (21) with the receiver.