Communications network, a dual mode data transfer system therefo

Details Communications network, a dual mode data transfer system therefo Communications network, a dual mode data transfer system therefo

1994-12-16

1996-11-26

Hsu, Alpus H.

Multiplex communications

Wide area network

Packet switching

370 83, 370 852, 370 858, 34082508, H04J 1500, H04L 12413

Patent

active

055792995

ABSTRACT:
A link apparatus in a node of a multinode, collision-resolution, multiplexing communications system connected between a microcontroller (MCU) that receives measurand data from an input device such as a sensor and an integrated driver and receiver (IDR) for assuming some of the functions of the MCU in delivering and receiving messages to and from a single-wire bus communications network. The MCU contains firmware for converting the measurand data into data bytes, the link apparatus and the MCU contain circuits for effecting a SPI transfer and the link apparatus contains additional circuits for converting each bit of the message bytes into variable pulse width modulated (VPWM) bits. The VPWM bits get converted into J1850 symbols before being placed on a single- wire communications bus. Circuits are provided in the link apparatus for checking arbitration of the protocol and data symbols communicated over the bus.

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