Excavating
Patent
1990-04-19
1992-08-25
Atkinson, Charles E.
Excavating
371 32, G08C 2502, H04L 114
Patent
active
051425386
ABSTRACT:
An infrared RS 232 communication link protocol is particularly suited for correcting any errors introduced during a transmission of information. The information is transmitted from a transmitting station to a receiving station. Each of the stations has a control counter each of which toggles between a logic 0 and 1. The control counter for the transmitter and the receiver are phase locked so that all errors may be corrected. The receiver echoes each data bit back to the transmitter which compares the echoed data to the transmitted data. If there is a match, the transmission was successful. If there is no match, the data must be retransmitted. A retransmit control character RTXx is sent to indicate that the receiver should discard the previous character and prepare for a retransmission of the character having the error. Under the proper circumstances and if the counters are still phase locked, the receiver then discards the previously stored character and inverts the counter. If the receiver detects that it has received an erroneous character, such as one having multiple or no PPM pulses, the receiver will simply respond with the reject control character REJ. In such a case, the transmitter will respond with an RTXx which causes the receiver to discard the previously stored character and invert the counter.
REFERENCES:
patent: 3402389 (1968-09-01), Koontz
patent: 3605091 (1971-09-01), Tong
patent: 3680045 (1972-07-01), Meidan
patent: 3805234 (1974-04-01), Masters
patent: 3910322 (1975-10-01), Hardesty, Jr. et al.
patent: 3934224 (1976-01-01), Dulaney et al.
patent: 3995258 (1976-11-01), Barlow
patent: 4254499 (1981-03-01), Yoshikane
patent: 4347609 (1982-08-01), Fukuyama et al.
Allen Richard C.
Fickes Stanley L.
Grady Robert J.
Piccone John
Reagan Rick L.
Atkinson Charles E.
Photonics Corporation
LandOfFree
Link protocol for RS 232 communications does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Link protocol for RS 232 communications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Link protocol for RS 232 communications will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-391111