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The ATV31 does not have Pull Up / Pull Down resistors for the RS485 Modbus communication. Have you seen any SLF when cables are disconnected? Do you r...

Goals and Symptoms

The ATV31 does not have Pull Up / Pull Down resistors for the RS485 Modbus communication. Have you seen any SLF when cables are disconnected? Do you recommend external resistors to maintain the proper bias?

Facts and Changes

ATV31 Modbus RS485

Causes and Fixes

The Pull up / Pull down are not present on the RS485 interface, but there is some confusion. In fact there is a time out if you take the hand on ATV31 bthe CMD word and if there is cab disconnection, the inverter will trip in SLF. It's not the case if you modbus only to read or write some parameters.

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