Abstract: A core collector for collecting aeration cores lifted from a ground surface by a ground aerator machine includes a skid plate having a bottom surface opposite the ground surface and a top surface opposite the bottom surface. The skid plate has a plurality of openings in the skid plate extending between the top surface and the bottom surface at a proximal end of the skid plate. The plurality of openings are spaced apart from each other based on a spacing of extraction tines of the ground aerator machine. The core collector has at least one core clearing member. Aeration cores are deposited directly onto the top surface of the skid plate. The at least one core clearing member is configured to clear the aeration cores from the proximal end of the skid plate toward the distal end of the skid plate.

Abstract: A core collector for collecting aeration cores lifted from a ground surface by a ground aerator machine includes a skid plate having a bottom surface opposite the ground surface and a top surface opposite the bottom surface. The skid plate has a plurality of openings in the skid plate extending between the top surface and the bottom surface at a proximal end of the skid plate. The plurality of openings are spaced apart from each other based on a spacing of extraction tines of the ground aerator machine. The core collector has at least one core clearing member. Aeration cores are deposited directly onto the top surface of the skid plate. The at least one core clearing member is configured to clear the aeration cores from the proximal end of the skid plate toward the distal end of the skid plate.

Abstract: A data communications system which includes a plurality of terminals TL.sub.1 -TL.sub.5) and a data bus (DB), wherein each of the terminals has autonomous access to the data bus. Each terminal includes a receiver (114) which is normally enabled to receive messages on the data bus and which provides a signal (ADA) signifying the absence of messages. A transmitter (120) within each terminal includes a protocol control unit (140) which enables the transmitter to initiate message transmission only upon (i) the detection of an absence of messages on the data bus whose duration substantially equals that of a sync gap that is common to all of the terminals, and (ii) the subsequent detection of an absence of messages on the data bus whose duration substantially equals that of a terminal gap that is unique to the terminal, with the duration of the sync gap being greater than the duration of any terminal gap.