|=========================================================================| | | | How to Fix the Most Common Modem Problems | | | |=========================================================================| MY SOFTWARE DOESN'T LIST THE INTEL MODEM If your communications program doesn't list your Intel modem in the set up screen, try selecting a Hayes compatible configuration. If the problems persits, change the "Initialization String" to match your modem type: Intel Modem Initialization String ----------------- ---------------------- SatisFAXtion AT&F\N0\Q0\J1\V0 14.4 EX/9600EX AT&F\N0\Q0\J1\V0"H0-J0 All 2400 Baud MNP AT&F\N0\Q0\J1\V0 14.4EX/9600EX CONNECTS ONLY AT 2400 BPS Intel High Speed modems (such as the 14.4EX and 9600EX) connect at 9600 bps (bits per second) only to modems which support the V.32 standard. Many high-speed modems (such as the Hayes V Series or US Robotics HST) support industry standards for speeds up to 2400 bps, but use proprietary standards at 9600. Without V.32 support on these modems, Intel High Speed modems connect to them at no greater than 2400 bps. Other modems (such as the Hayes Ultra 9600 or US Robotics HST Dual Standard) support V.32 in addition to the proprietary standard. With V.32 enabled on these modems, Intel High Speed modems can connect to them at 9600 bps. USING COM3/COM4 UNDER WINDOWS 3.0 If you have problems using the your modem on COM3 or COM4 under Windows 3.0, exit Windows and use Intel's TESTCOM.EXE program (which comes with all Intel modems) to test your modem. TESTCOM performs several diagnostic tests on the modem and helps you verify the phone line connection. SatisFAXtion board users who need a copy of TESTCOM can order document 0018 from Intel's FaxBACK system. Modem users can download TESTCOM from the Fax/Modem section of Intel's BBS. Once you know the modem works on COM3 or COM4 outside of Windows, you can test the modem with your Windows program. If you run Windows in Enhanced mode, you need edit the Windows SYS.INI file. Under the [386enh] symbol, add these lines: COM1BASE=3F8h COM2BASE=2F8h COM3BASE=3E8h COM4BASE=2E8h Editing your INI files is risky business. Carefully read your Windows documentation or call Microsoft Microsoft Technical Support if you questions or problems. =========================================================================== February 24, 1992 Intel FaxBACK # 4364 Page 1 |=========================================================================| | | | How to Fix the Most Common Modem Problems | | | |================================ (continued) ============================| Microsoft Tech Support: 206-454-2030 ERRATIC RESPONSE TO AT COMMANDS Erratic response to AT commands can be attributed to two things: IRQ Conflicts and/or COM port overlaps. You can use the TESTCOM.EXE program can verify modem operation and detect conflicts. First ensure that no other devices are using the same IRQ as the modem. Modems use IRQs to signal the computer that data has been received or sent. For an internal modem, make sure that the COM port it's set to does not conflict with a COM port already in the system (whether used or not). When in doubt, try another COM port setting. Port I/O IRQ ---- --- --- COM1 3E8 4 COM2 2E8 3 COM3 3F8 4 COM4 2F8 3 For instance, consider a situation where you add an internal modem to a system which has COM1 and COM2 built in. There's a mouse on COM1 and nothing on COM2. You must either: þ Disable the built-in COM2 and address the modem as COM2 (prefered) þ Leave the mouse on COM1 and address the modem as COM4 þ Move the mouse to COM2 and address the modem as COM3 MODEM DIALS BUT DOES NOT CONNECT Modem Dials but Does Not Connnect This problem commonly results when your modem is set to use MNP but the remote modem doesn't support MNP. It can also happen if the value in your modem's S7 register is too low. The value in the S7 register tells the modem how long to wait for a carrier signal after dialing. To find out if MNP is causing the problem, enter the command: AT\N0&W. If the problem persists, make your modem act like a Hayes modem by entering the command for your modem: Intel Modem Command ----------------- ----------------------- SatisFAXtion AT&F\N0\Q0\J1\V0&W 14.4EX/9600EX AT&f\N0\Q0\J1\V0"H-J0&W All 2400 Baud MNP AT&F\N0\Q0\J1\V0&W To find out if the value in the S7 register is causing the problem, increace the value from its default of 30 seconds. Run the TESTCOM program, select the "Terminal emulation mode", then type ATS7=60&W and press ENTER. If this doesn't help, try a higher value (the maximum is 255). =========================================================================== February 24, 1992 Intel FaxBACK # 4364 Page 2 |=========================================================================| | | | How to Fix the Most Common Modem Problems | | | |================================ (continued) ============================| Here are the common symptoms of an MNP problem: Your modem dials, the remote modem answers, the modem tones begin, then either: a. your modem hangs up, or b. your modem does nothing while the tones continue. If the user still can't connect after disabling MNP, try calling the system yourself. If they're using a SatisFAXtion modem, make sure they have the latest software. If not, they can order 0011 from Faxback. MODEM WON'T ANSWER THE PHONE There are two reasons why the modem won't answer: 1. The modem isn't in Auto-Answer mode. 2. The modem doesn't see the DTR signal from the computer. The command ATS0 controls Auto-Answer mode. An external modem turns on "AA" light on when Auto-Answer mode is enabled. ATS0=0 disables Auto-Answer ATS0=1 answer after 1 ring The command AT&D controls how the modem responds to the computer's DTR signal. An external modem turns on the "TR" light when it sees or is set to ignore the DTR signal. If the "TR" light isn't on, the modem won't answer whether Auto-Answer is enabled or not. AT&D0 Modem ignores DTR signal AT&D2 Modem swtches from data to command mode, hangs up and disables Auto-Answer mode when DTR switches from ON to OFF. Use AT&D0 if you serial port doesn't support the DTR signal or if your modem cable doesn't connect to it. Otherwise, use AT&D2. DTR is on pin 20 of a 25-pin connector and on pin 4 of a 9-pin connector. =========================================================================== February 24, 1992 Intel FaxBACK # 4364 Page 3