Communications protocol for use in transferring data over a seri

Details Communications protocol for use in transferring data over a seri Communications protocol for use in transferring data over a seri

1993-04-05

1995-10-03

Eng, David Y.

Boots, shoes, and leggings

36494081, 3642385, 364130, 395866, 395868, G06F 1342

Patent

active

054559111

ABSTRACT:
A communications protocol for use in implementing serial communications over a common system backplane in an industrial control system such as a remote I/O system. The protocol includes separate start access, read access and write access sequences. Different locations at which I/O modules may be present as defined by select line connections are polled pursuant to the start access sequence to verify the presence of such modules. Module status words and separate groups of data read words and data write words are exchanged over the system backplane in standardized data frames. As the data bits of the data words are transmitted they are echoed back to the transmitting component for error detection purposes.

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