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Mitutoyo AT715 magnetic scales - Printable Version

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Mitutoyo AT715 magnetic scales - Walker - 07-31-2017

Hi, has anyone had any luck using AT715 scales with the "TouchDRO Adapter for Glass/Magnetic Quadrature Scale" kit?

Looking for something fully sealed and the AT715 seems to be a good set, just want to make sure we are going to be able to get it to work properly!

thanks


RE: Mitutoyo AT715 magnetic scales - Yuriy - 07-31-2017

(07-31-2017, 03:24 PM)Walker Wrote: Hi, has anyone had any luck using AT715 scales with the "TouchDRO Adapter for Glass/Magnetic Quadrature Scale" kit?

Looking for something fully sealed and the AT715 seems to be a good set, just want to make sure we are going to be able to get it to work properly!

thanks

Walker,
These don't look like quadrature scales.

Thank you
Yuriy


RE: Mitutoyo AT715 magnetic scales - Briney Eye - 07-31-2017

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).


RE: Mitutoyo AT715 magnetic scales - Yuriy - 07-31-2017

(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...