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How to program CR-850 to read RS-485?

Unilab Nov 2, 2022 03:54 PM
Dear friends,
How to program the CR-850 to read RS-485?

I use PC-400 and CR Basic software.

I have some weather stations and wind sensors that have a common RS-485 output.
I would like to know how to program to read this output and where to connect the sensor to the CR-850?

Thanks a lot for the help.


GaryTRoberts Nov 2, 2022 04:02 PM

In order to have a RS-485 sensor read by a CR850, you will need to have a MD-485 attached to the data logger via a CS I/O cable. Then you can use the Serial instructions to read the sensor attached.

kirving Nov 2, 2022 04:13 PM

You'll need an MD485 device to interface RS232 from the logger to RS485, e.g., using two control ports for RS232 Tx and Rx.  I don't know if they have a CR850x, but the CR1000x added direct support for RS485 via the control ports, whereas for the CR1000 an MD485 was required.

Unilab Nov 2, 2022 06:14 PM

Thanks very much Gary and Kirving! i buy It. 

artyb Nov 3, 2022 11:32 AM

On CR1000 loggers we use SDM-SIO1A or SDM-SIO4A-might be an option too?

JDavis Nov 7, 2022 04:48 PM

Yes, those modules work also.

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