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?