Prakash,
The setup commands look correct for setting up rs485-half duplex mode on accessory card port 2.
I don’t know a lot about python minimalmodbus, but when you create the instrument object “inst” I’m assuming that you have the correct slave address. Also, when you call read_register you are asking for four decimals. Is that correct? Another note is that 40605 is a pretty high register number, is that correct?
Jeff