#7 Connection Closed Gracefully Error

[Reza]

Hi Friend!
I'm trying to develop a simple program using delphi to send and receive data between PC and a device which is using modbus RTU over TCP/IP protocol.
I installed Delphimodubs 1.5.2 in Delphi7 and run ModbusMaster.exe in Indy9.
I enter my device IP and also the register number, and press Read Register button, but I receive an error "Connection Closed Gracefully".
I can connect to my device with SimplyModbus TCP software, would you please check the picture here and help me with the problem?
http://s3.picofile.com/file/7659224301/Error.jpg

Thanks!
Reza

[Reza]

Error