H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/233
H04L 1/16 (2006.01) H04L 12/18 (2006.01) H04L 12/433 (2006.01)
Patent
CA 1267231
20365-2637 ABSTRACT OF THE DISCLOSURE A data transmission system having a number of control devices connected by at least one clock-control transmission loop operated directionally dependent insures that a data signal intended for a group of control devices in the system is actually received by all of the intended control devices. The control device emitting the signal adds an entry preceding the data por- tion of the signal which identifies all receivers in the group and which also includes a block start identifier, and also adds a last entry to the data portion of the signal which is the address of the sending control device and a block end identifier. Each con- trol device in the group, upon receiving the signal, copies the signal for possible processing, cancels the block end identifier in the last entry of the received signal, and adds a new last entry which is the address of the receiving control device, and acknowledgement of receipt of the signal, and a new block end identifier corresponding to the cancelled block end identifier. The signal is then re-emitted to the loop for transmission to the next control device. After the signal has been transmitted around the entire loop, it returns to the original sending control device which interprets the acknowledgement signals and corresponding addresses in the successively added last entries to determine whether all of the intended control devices in the group actually receive the signal.
517753
Kerschner Gunther
Michels-Krohn Karl-Heinz
Untergruber Josef
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
Kerschner Gunther
Michels-Krohn Karl-Heinz
Untergruber Josef
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