My MC403-Z is  setting as follow:

I am a beginner by using motion perfection with trio basic. 

I wish to read the content from my modbus slave device.

SETCOM(9600,8,2,0,2,4,0,4,1)

I am using  RS485 with 2 wires

The function 0 & 1 & 2 for MODBUS command looks fine for me.

But I am NOT ABLE to perform function 3 with the correct result.

My command to the slave node 3 is  $030306270002756A

Follow is my program:

MODBUS(3, -1, VR(modbus_handle),$030306270002756A,25)

What's wrong with my command? 

Is there any other way to send commands to my RTU slave devices?