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Connections to Digital I/O card.
These are Limo Lemo ERA.00.250 sockets taking FFS.00.250 connectors. All inputs are configured as 3.3V TTL high impedance (though 50Ω termination can be configured in software if desired), all outputs are driven as 3.3V TTL. All inputs are acted on once per machine revolution in response to a rising edge, but are continuously sampled (at machine RF frequency).
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