FaxModem/V.42bis (250-3028) Installation Faxback Doc. # 3290 This section is intended to get you up and running quickly if you have a personal computer and you're already familiar with MNP or V.42bis modems and their installation. 1. For V.42bis and MNP5 to work with a PC compatible, you must use a cable that supports hardware flow control (preferably shielded). Make sure that the CTS and RTS lines are connected. If AT LEAST 9 lines are connected, they probably are. The cable should have a 25-pin male connector on one end and a connector for your computer's serial port on the other end. If your computer or your cable does not support hardware flow control (i.e., the Mac 128 and 512 do not), you will need to set up your communications software for software flow control. 2. Connect the faxmodems phone cord between your telephone network jack (the one on the wall) and the faxmodem's phone jack closer to the center of the back panel (next to the DB-25 connector). If you would like, you may plug a phone into the faxmodem's other modular jack. 3. Set up your modem software. In setting up your data communications software for the first time, you may be asked to enter certain setup information. While the exact format may vary, the information required should be similar to the "Sample Software Setup" on the following page. 4. Install and set up your fax software. In most cases, you won't need to do any special setup for your fax software, since fax is more standardized than modem communications and much of the configuration is automatically negotiated during the "handshake" between the fax devices after connection. Sample Communications Software Setup MODEM OPTIONS INITIALIZATION STRING : AT &F &DO &C1 S36=7 S95=44 DIALING COMMAND : ATDT DIALING COMMAND SUFFIX: ^M HANGUP COMMAND : ~~~+++~~~ATHO^M AUTO-ANSWER COMMAND : ~~~+++~~~ATSO=1^M WAIT FOR CONNECTION : 45 (seconds) PAUSE BETWEEN REDIAL : 1 (second) AUTO-BAUD DETECT : ON DROP DTR TO HANGUP : YES SEND INIT IF CD HIGH? : YES TERMINAL OPTIONS HARDWARE FLOW CONTROL (RTS/CTS): ON As mentioned earlier, if your computer or cable does not support hardware flow control, you will need to set up your communications software for software flow control (XON/XOFF) instead. DIALING DIRECTORY Set all entries in the Dialing Directory to 9600 bps, even if you're calling a 300, 1200, or 2400 baud modem. The parity, data, and stop bit settings depend on what the modem you're calling is expecting. With the above setup, all communications between your computer and the modem will take place at 9600 bps, independent of the modem-to-modem speed. The modem will auto-negotiate the highest performance connection mode between itself and the other modem. In some cases the delay that occurs during auto-negotiation may cause a problem. Type AT\NO in terminal mode if you need to disable auto- negotiation. To re-enable auto-negotiation, type AT\N3. Connecting the FaxModem This section explains the procedure for connecting the faxmodem to the phone line, to power, to the PC or other serial device and, if desired, to a telephone. Once the faxmodem is connected it must be configured. Configuration is covered in the next chapter, "Getting Ready to Communicate". The Serial Connector To connect the modem to your computer, the computer must have an unused serial port, also known as an RS-232 interface, or an "A/B" serial port switch. The jack that you plug this serial connection into comes in several different shapes, but the most common by far is the DB-25 connector, followed by the DB-9 on many ATs, some other PC compatibles and on older MacIntosh computers, and the Circular 8 used on the Mac Plus and newer Macs. These connectors are illustrated on the following page. For V.42bis and MNP5 to work, you must use a shielded cable that supports hardware flow control, with a 25-pin male connector on one end and a connector for your computer's serial port on the other end. If you have an IBM PC or compatible, any MODEM cable that fits your PC should work. If you have a Mac, check that pin 4 of the cable's 25-pin modem connector is wired to the Mac side of the cable (pin 1 for the Mac SE, II, or Plus). On computers with plug-in expansion slots like the IBM PC and compatibles, the serial port is normally part of an expansion card, and therefore can be found at the expansion card slot openings at the back of the PC. Many other machines, particularly those without expansion slots (including laptops and other portables), have the serial port built-in. Either way, it will normally be labeled "serial port" or "RS-232C". The Serial Cable External modems and faxmodems normally do not come with serial cables, since each computer requires a different cable depending on the type of serial connector it uses and how that connector is wired. Since the serial port of this faxmodem is compatible with the Hayes 2400 external modem, the easiest way to specify the correct cable to your computer dealer is by asking for the cable to connect a Hayes 2400 modem to your brand and model of computer. MORE ABOUT SERIAL CABLES There are two types of serial configuration: Data Communications Equipment (commonly called DCE) and Data Terminal Equipment (commonly called DTE). The serial port of this faxmodem is configured as Data Communications Equipment DCE), just like the Hayes Smartmodem 2400. The serial ports of ALL terminals and most computers are configured as Data Terminal Equipment (DTE). Each type of computer requires a special cable with a male (with the pins sticking out) DB-25 connector on one end to plug into the modem, and the appropriate connector for your computer or terminal on the other end. Therefore, if your computer is configured DTE (and most are), you should ask for a DTE-TO-DCE STRAIGHT-THROUGH CABLE WITH A MALE DB-25 CONNECTOR ON ONE END, AND THE APPROPRIATE CONNECTOR FOR YOUR COMPUTER OR TERMINAL ON THE OTHER END. It is preferable that the cable be shielded. Some computers (but not many) are configured DCE instead of the normal DTE. For these computers, instead of a straight-through cable, ask for a "null modem cable" (sometimes called a "crossover cable" or a "modem eliminator cable"). (br/all-11/3/94)