Is possible to use RS485 to read a CMOS laser sensor?

  • vermilion
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15 Jul 2026 02:53 #347775 by vermilion
Hola. I want to use a CMOS laser sensor with an RS485 interface and find out if it is possible to use the RS485 terminal on the 7i96s board to read the sensor values. My goal is to use the laser to measure height and move the Z-axis to a specific initial height on a plasma cutting machine. I consulted Gemini AI, and it indicated that I needed to flash new firmware to enable this function; consequently, I visited the Mesa website and downloaded the hostmot2 file for the 7i96s. Could someone confirm if that hostmot2 file allows me to use the 7i96s's RS485 port in the way I intend? Thank you very much .

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  • Todd Zuercher
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15 Jul 2026 09:52 #347785 by Todd Zuercher
Replied by Todd Zuercher on topic Is possible to use RS485 to read a CMOS laser sensor?
I've never attempted it myself, but supposedly it should be possible.
linuxcnc.org/docs/html/drivers/mesa_modbus.html

I have always used an ordinary serial port (such as a USB to RS485 adapter dongle) to communicate with Modbus devices using the MB2Hal driver.

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15 Jul 2026 15:48 #347792 by PCW
What protocol does the sensor use?

Modbus is supported by Mesa FPGA cards with the hm2-modbus/PktUART
drivers.

If your sensor does not use Modbus, fora Mesa card, it would require
a driver part like hm2-modbus communicating with the PktUART driver


 

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