Excavating
Patent
1989-03-08
1990-09-25
Smith, Jerry
Excavating
G06F 1108
Patent
active
049598333
ABSTRACT:
A bus extender and data transmission method in which a continuous train of message frames of fixed size is sent along a dual serial link in both directions simultaneously. There is no handshaking between extenders unless a transmission error is detected. Message frames are constructed at a rate which is independent of serial link length and the bus data transfer rate. Each extender is divided into a bus handshake layer which sends and receives data and signals from a local bus, a management layer which continuously constructs message frames, responds to commands and receives and decodes incoming messages from a remote extender, and a transport layer. The transport layer has shift registers and encoders to receive messages from the management layer and transmit them over the serial link and has a memory to store up to 30 messages in the event of a retransmission request. The transport layer also receives messages from the serial link, checks for valid error-free messages and sends them to the management layer. It also initiates a retransmission request in the event a transmission error is detected.
REFERENCES:
patent: 3979719 (1976-09-01), Tooley
patent: 4479228 (1984-10-01), Crane
patent: 4577317 (1986-05-01), Chu et al.
patent: 4787029 (1988-11-01), Khan
ICS Electronics Corp., "Building Blocks from ICS . . . ", n.d., pp. 2-5, 21-36.
Huang Shih-Hsing
Mercola Gerald K.
Beausoliel Robert W.
ICS Electronics Corporation
Schneck Thomas
Smith Jerry
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