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Problem CR1000X RS485 modbus

chalit Sep 29, 2021 05:05 AM

Hi,

 I have strings of Modbus device with powered by 12VDC from logger.

I measured the voltage at the the end of string and found voltage 10.4VDC -> OK to power the device.

Most of sensor shown output...

But some of device in strings are no output, these device are not malfunction - i tested one by one.

So, I measure the volage at RS485 A and B (is CR1000X C5 and C6) by voltmeter.

its only about 16-22mV during standby

and about 30-45mV during comm

The low voltage at C5-C6 is normal?

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