Delta plc Communication Issue

Dear all

I have DVP14SS211R series Delta PLC Which is having 24V DC supply voltage. I am using PLC as master and My end device as slave. My slave device set device_iD=1
I am using Modbus RTU protocol for Function code1
baud rate =9600
parity =none
Stop bit=1
data length=8

I would like to know how to send request with Function code 1(Read coil Register). i have attached code reference. Communication block it wont give error it shows 0 .means No error