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Device is not working with multiple MODBUS slave

Dear Sir/Madam,Using ST490ABDR IC as RS485in the Weather Monitoring project. The device is not working with multiple MODBUS slave. I observed signal level on the Oscilloscope, it is dropped at the time of query. Please find attached Schematic and wav...

AAdsu.1 by Associate
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X-NUCLEO-GNSS1A1 expansion board wrong GPS location

Hi,I have two X-NUCLEO-GNSS1A1 expansion boards.I powered on the first board, and connected to UART port. I can read GPS messages from the board. GPS location is good. (I got GPRMC and GPGGA, GPGLL, etc.) I don't know what I did. Somehow NMEA messag...

DZhou.1 by Associate II
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