Has anybody ever seen an SSI encoder interface that only uses 2 wires. I beleive the standard is 4 wire, 2-clock and 2-data. I am trying to retro fit a servo drive. The drive was custom made to change the buffered encoder out port to an SSI port. This SSI port is connected to a PC controller and is used to close the position loop. I'm just confused as to why only 2 wires. This doesn't seem to comply with any standard that I am aware of.
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