I am trying to connect and pull data from a multismart via modbus. I can ping the IP address of the multismart and the Modbus address for the driver is 1, but I am getting an error code of 260 from the IP address and an error code of 531 on the driver. I tried connecting to the multismart with a modbus scanner via TCP/IP but I cannot pull any data from the registers.

Multi-Smarts often have an IP whitelist, you may need to check the device to see if it is open to accepting connections from your PC.