i would like to know,
can customer remove the GND line and have no isolation if the cable length is only 1m in RS485? Please kindly share your expertise. Thanks.
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This depends not on the length of the cable, but on the actual difference of the two ground voltages.
The THVD1450 can handle ±15 V differences, which is unlikely to happen for nearby devices.
Are the two transceivers powered from different supplies? Is there a noise source (e.g., heavy machinery) only on one of the supplies?