Ethernet Communication Module IFD9506 „ Switch to “User Define” page to set up the “Fix Length”, “Start Item” and “Stop Item”. 1 ~ 256 1. Listen Port/Destination Port: Range: 1024 ~ 65535. 5. Fix Length: When this is sest, IFD9506 will transmit data following the fixed length. DVP-PLC Application Manual 37