Correcting Modem Access Problems with Applications

You cannot send or receive binary files by using HyperTerminal.

• Make sure that both computers are using the same file transfer protocol (that is, Xmodem, 1K Xmodem, Ymodem, Ymodem-G, Zmodem, or Kermit).
• If you are using the Ymodem-G file transfer protocol, ensure that your modem supports hardware error control. If it doesn't, try using Ymodem instead.
• If you are trying to use an alternative protocol (such as Kermit) and you encounter transmission errors, try Xmodem instead. Most communications packages, bulletin boards, and online services support Xmodem.

You cannot dial with Phone Dialer.

• In the Dialing Properties dialog box, make sure your area code and country code are correct.
• For each access number you want to use for calling out, specify, at a minimum, the country code, area code, and telephone number.
• Verify basic modem and port configurations.

Win16-based applications cannot access the modem, but MS-DOS – based or Windows 95-based applications can.

Make sure the communications driver for Windows 3.1-based applications is COMM.DRV in the SYSTEM.INI file. Some applications replace this driver for various reasons.

MS-DOS – based applications cannot access the modem (especially PCMCIA modems), but all Windows-based applications can.

• If possible, adjust the IRQ setting in the MS-DOS – based application according to the application's documentation.
• If the MS-DOS – based application's IRQ settings cannot be adjusted, adjust the IRQ settings for the modem COM port as described earlier in this section.

MS-DOS – based and Windows 3.1-based applications cannot access the modem, but applications created for Windows 95 can.

Make sure that Microsoft Exchange Remote Mail, Microsoft Fax, and Dial-Up Networking are not waiting for incoming calls. If they are, older applications cannot access the modem.

Errors occur during MS-DOS – based applications communications sessions, especially file transfers.

Increase the COMxBuffer setting in [386enh] section of SYSTEM.INI. The default value is 128 bytes.