A510 VFD Modbus RTU via RS485_DI state values in register

[ikhan123]

Hi all,

(I am reposting here, from labview location)

I have a Teco Westinghouse A510 VFD which i am controlling a 3phase motor/hoist and I am controlling using the Modbus Library via RS-485 and using serial com RTU.

I am getting the motor to spin and write to the registers, however, I am having difficulty reading a particular register with multiple bits that I need to access on the same register, see the images below (Modbus Com manual for VFD). I have uploaded my vi below and also the modbus manual for the VFD for reference. 

I need to access the DI state to read if they are open (0) or closed (1). Also, does the Modbus API control the CRC check or do I need to include that somehow, if so how?

Any help would be greatly appreciated.

Thanks,