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Dear Jschulze and Briank, I had a meeting with the manufacturer. He explained why I was getting insufficient bytes received an error on Modbus Poll software and also the proper procedure for changing node address of rotary encoder. 1. In Modbus poll parity should be selected to none and make...

I think modscan64 requires paid version to write node update because extended option is disabled by the software. Correct me if I am wrong. Tried many time updating register 262 to any value gives error.

I tried following steps guided by you. for register update value update of 262 and length of 2 I am receiving an error. MODBUS Exception response.

Getting wrong data. for example serial number is different from the one mentioned on the sticker of the device.

entering 262 results 0. When trying to write its value pops up this error. Length of 10 setting results in successful communication.

here's the info on USB to RS485 converter that I have been using. I am also attaching details of SMPS. by using Modscan64 I got this result.

I'm using a generic usb to rs485 bought from amazon. It does not have any gnd screw terminal only A and B. I used earthing terminal of my 24v SMPS as ground for encoder device. I tried connecting both ground and 0v of device to earthing of smps but error still pops up. Insufficient bytes received.

Dear jschulze, I have followed your instructions. This time I am getting timeout error. I'm attaching screenshot of traffic as per you said.

Device have an M12 Connector of 5 pins Pin descriptiom; 1. GND 2. +V ( I am providing +24 V DC) 3. 0V 4. D1( D+) 5. D0 (D-) My coverter only have A & B ( D+ and D-). so 2 and 3 are connected with 24V SMPS and 4&5 with D+ and D- of RS485 converter.