Why the PCL-844H was found but can't transfer data?

Solution:

• Why the PCL-844H was found but can't transfer data?

  Common problems and possible solutions are listed below:
  
  HARDWARE:
  A. Wrong cable wiring:
  Check if wrong cable wiring. Refer to Appendix B.3 of PCL-844H manual for precise pinouts of the connector type you are using.
  
  B. Defective control box:
  Cable or external module is defective. Please change another one to test again.
  
  C. IRQ conflict:
  IRQ is used or reserved by PCI bus. Please adjust it or go to BIOS to modify "PNP and PCI setup" configuration.
  
  
  
  SOFTWARE:
  A. RTS/CTS signal:
  PCL-844 series will check line status ( CTS ) before it sends data out if RTS/CTS flow control feature is set to ON in configuration or application program. Please see Appendix B.3 of PCL-844H manual Type 3 for proper wiring. Check the line status of the suspected port using the disgnostic LED indicators on the mini-tester.
  
  B. Existed good examples for testing:
  Perhaps the application controlling the board is not correctly written according to the corresponding API of the operation system. To verify, please run existing and known good application or Advantech-provided utility. For example, under Windows 95, "Hyperterminal" is good for testing COM ports. Under UNIX, "stty", "cat", or "getty" is existed program for testing tty port.
  
  C. IRQ setting:
  IRQ settings of software and hardware do not match.