Dear All,

I have to communicate with a Atlas Copco PF 3000 controller which supports ethernet. I have CP-343-1 Lean module & at present & i used TCP connection.

Requirement: I will send 21 bytes to the controller thru AG send & on send done bit i will disable this AG SEND. And the controller will respond to this by sending back me 63 byte data. On receiving the 63 byte data i will disable the AG RECEIVE.
Like this i have to do multiple send receives as shown in the flow chart in this attached sheet.

Now the problem is if an operation is performed in the controller then on its own the controller will send the datas (122 Bytes). On that time exactly i am unable to make enable the AG Receive block for data receive & the problem starts.

So what i made is to enable AG send momentarily as on when requirement( as like previous logic) & AG receive i made continous enable. And i faced the problem i am not getting NDR output. So i made to compare the receive number of receive bytes & assumed in place of NDR output. But still AG RECEIVE hangs on saying error some times. Please help any body came across similar problem?