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Mitutoyo AT715 magnetic scales
(07-31-2017, 09:51 PM)Briney Eye Wrote: From homeshopmachinist:

The transmission is with 19.2KBaud. (usual mode: 8 Data bits 1 Stop bit, no parity)
Although it's a RS485 transceiver it has a termination resistor of 470Ohm and not the usual 120Ohm. Maybe the AT715 has not enough power to drive a 120Ohm line.
Each signal line is PU/PD accordingly to it's level with a 2k resistor.

The AT715 sends its position every 50ms (20 times/second), so it is surely not usable for realtime controlling.
It always sends 6 Bytes in a row
The first byte is always zero
Then there are 4 Bytes for the absolute position (resolution 0.5um) with LSB first. Negative values are in twos complement.
The last byte is a checksum (just all other bytes added).

Yeah, that will not work with any of the controllers. This is their weird protocol from the 80's...

Messages In This Thread
Mitutoyo AT715 magnetic scales - by Walker - 07-31-2017, 03:24 PM
RE: Mitutoyo AT715 magnetic scales - by Yuriy - 07-31-2017, 03:42 PM
RE: Mitutoyo AT715 magnetic scales - by Yuriy - 07-31-2017, 11:12 PM

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