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Thanks everyone - I have some reading to do and need to check out a few new devices. Thanks again for your help.

Hi I am just trying to lean how RS485 works. I have done some testing with a 1-Wire system to read temperature devices and read magnetic door switches. I want to try this with RS485. I know the device (DS2406) to use with 1-Wire. Is there a commercial device to use for RS485 that can be used...

Hi Yes I understand that I need some device between the RS485 wires and the Magnetic door switch. Just cannot find them. Will look for 'Serial Converters' Does anyone know any off the shelf units to read switches etc? I have used 1-Wire before and that has very cheap devices to do this, but...

Hi I am new to RS485 and have it working to read temperature sensors etc. I have a few magnetic door switched to determine if a door is open or closed. How can I read these with RS485? I assume I need some other device between the switch and the RS485 bus, but have searched various suppliers...