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T

ECHNICAL

R

EFERENCE

8-37

The Serial Interface

The serial interface is a standard developed by the Electronic Industries
Association (EIA). It defines the signals and voltages used when data is
exchanged between a computer and a modem or serial printer.

The entire standard covers many more functions than are used in most data
communications applications. Data is transmitted between the devices over a
shielded serial cable with a 25-pin male (DB-25) connector to the modem and a
25-pin, 9-pin, 8-pin, or custom-built connector to the computer.

FCC regulations require the use of a shielded cable when connecting a modem to
a computer to ensure minimal interference with radio and television.

Pin assignments are factory-set in the U.S. Robotics modem to match the
standard DB-25 assignments in the following table. DB-9 connectors for
IBM/AT-compatible computers should be wired at the computer end of the cable
as shown in the DB-9 column.

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Содержание 005699-00 -

Страница 1: ...espective owners Copyright 1998 3Com Corporation All rights reserved 3800 Golf Rd Rolling Meadows IL 60008 IMPORTANT In accordance with the ITU T standard for 56K transmissions V 90 U S Robotics 56 Kbps modems are capable of 56 Kbps downloads However due to FCC rules which restrict power output of service providers current download speeds are limited to 53 Kbps Actual speeds may vary due to line c...

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Страница 3: ...Robotics Modem 5 1 Uninstalling a Winmodem Faxmodem 5 1 Uninstalling an Internal Faxmodem 5 3 Uninstalling an External Faxmodem 5 4 Uninstalling a Faxmodem for Macintosh 5 5 Troubleshooting and Help Resources 6 1 Problems and Solutions 6 1 Help Resources 6 19 Are You Still Having Problems 6 21 If You Need to Return the Modem to Us 6 22 Glossary 7 1 Technical Reference 8 1 Regulatory Information an...

Страница 4: ...Link Rates 28000 29333 30666 32000 33333 34666 36000 37333 38666 40000 41333 42666 44000 45333 46666 48000 49333 50666 52000 53333 54666 56000 57333 Back Channel Link Rates 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800 31200 33600 V 34 Link Rates 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800 31200 33600 V 32bis Link Rates 4800 7200 9600 12000 14400 Additional Link...

Страница 5: ... by following these steps Insert the Connections CD into your CD ROM drive If the CD is already in your drive take it out and reinsert it If you have disabled AutoPlay click Start point to Programs point to 3Com U S Robotics and click Connections Installing the RapidComm Software NOTE If you have an older version of RapidComm software on your system uninstall it before continuing To start the unin...

Страница 6: ...SOFTWARE INSTALLATION 2 1 The Connections CD contains the RapidComm communications software RapidComm is used with the standard ...

Страница 7: ...ctions CD follow the instructions in the section Using Connections Software on page 2 1 2 On the main Connections menu click Software 3 Click the Communications button 4 Click the RapidComm if you have a regular faxmodem or RapidComm Voice if you have a voice faxmodem button 5 Follow the on screen instructions to finish the installation NOTE The CD also contains an electronic user manual for Rapid...

Страница 8: ...lowing these steps Insert the Connections CD into your CD ROM drive Double click the Connections icon on your desktop Double click the Connections icon in the Connections folder Installing the RapidComm Software NOTE If you have a version of MacComCenter or any other communications software on your system read your manual for instructions to uninstall it before continuing This will erase any faxes...

Страница 9: ...nstructions in the section Using Connections Software on page 2 3 2 On the main Connections menu click Software 3 Click the Communications button 4 Click the RapidComm if you have a regular faxmodem or RapidComm Voice if you have a voice faxmodem button 5 Click Install Software 6 Follow the on screen instructions to finish the installation NOTE The CD also contains an electronic user manual for Ra...

Страница 10: ... button on top of the modem 5 Hang up the handset 6 To end the call press the SPEAKER button again Making a Speakerphone Call with Communications Software 1 Dial the telephone number using your communications software 2 To end the call hang up using your software see the software s Help file for more information Answering an Incoming Call When you hear your phone ring press the SPEAKER button If y...

Страница 11: ...lift the handset of the telephone connected to the modem s PHONE jack To disable the speaker during a call Pick up the handset of the telephone connected to the modem s PHONE jack To use the speaker again press the SPEAKER button and then hang up the handset Adjusting Speaker Volume Press the up and down volume buttons on top of the modem marked VOLUME Muting a Call If you d like to say something ...

Страница 12: ...r from our Web page http www usr com home online NOTE Complete the instructions in the Software Installation chapter before installing the Modem Update Wizard Installing the Wizard 1 Insert the Connections CD into your CD ROM drive 2 The Connections interface will appear automatically in your Web browser 3 Click Customer Support 4 Click Modem Software 5 Click the Modem Update Wizard button 6 Click...

Страница 13: ...ns see our Web page http www 3Com com 56k Updating Your Modem 1 Click Start point to Programs and then point to U S Robotics Modem Update Wizard Finally click the Modem Update Wizard selection 2 Follow the on screen instructions to complete the update process ...

Страница 14: ...ur Web page http www usr com home online NOTE Complete the instructions in the Software Installation chapter before installing the Modem Update Wizard Installing the Wizard 9 Insert the Connections CD into your CD ROM drive 10 The Connections interface will appear automatically in your Web browser 11 Click Customer Support 12 Click Modem Software 13 Click the Modem Update Wizard button 14 Click In...

Страница 15: ...uctions see our Web page http www 3Com com 56k Updating Your Modem 1 Double click your Hard Drive icon 2 Double click the Modem Update Wizard folder 3 Double click the Update Wizard icon 4 Follow the on screen instructions to complete the update process ...

Страница 16: ...modem see page 5 3 An External Faxmodem see page 5 4 A Faxmodem for Macintosh see page 5 5 Uninstalling a Winmodem CAUTION To avoid the risk of electric shock make sure your computer and all peripheral devices are turned off and unplugged 1 First remove the Winmodem software from the Windows operating system From the Start menu point to Settings and then click Control Panel 2 Double click the Syst...

Страница 17: ...d click the Device Manager tab If you do not see a modem icon you ve successfully uninstalled your Winmodem software If you do see an icon repeat these instructions beginning with step 1 CAUTION To avoid the risk of electric shock make sure your computer and all peripheral devices are turned off and unplugged 11 Finally physically remove the Winmodem from your computer Start by removing the phone ...

Страница 18: ...odem 1 First remove the modem from the Windows operating system From the Start menu point to Settings and then click Control Panel 2 Double click the Modems icon 3 Click to highlight the name of the modem you wish to remove 4 Click the Remove button CAUTION To avoid the risk of electric shock make sure your computer and all peripheral devices are turned off and unplugged 5 Finally physically remov...

Страница 19: ... its slot 12 Replace the computer s cover Uninstalling an External Faxmodem 1 First remove the modem from the Windows operating system From the Start menu point to Settings and then click Control Panel 2 Double click the System icon 3 Click the Device Manager tab 4 Double click the Modems icon 5 Click to highlight the name of the modem you wish to remove 6 Click the Remove button 7 Finally physica...

Страница 20: ...rial cable from the computer Uninstalling a Faxmodem for Macintosh 1 Turn off your computer 2 Disconnect the power adapter from your modem and unplug it from the wall 3 Detach the serial connecting cable from both the modem and the port on the back of your computer marked with a telephone icon 4 5 Unplug the phone cord from the telephone jack of the modem labeled with a wall plug icon on the botto...

Страница 21: ... MODEM 5 6 Once your modem is disconnected you ll need to uninstall the RapidComm software For more information on uninstalling the communications software included with your modem see the RapidComm manual on your Connections CD ...

Страница 22: ...rned on If you have an internal modem check to make sure that the modem has been firmly inserted into the appropriate slot Another application may be controlling the port that the modem is using Quit all other applications and see if the issue persists The modem won t go off hook to dial or doesn t answer the phone Possible Solutions You may have plugged your modem s phone cord into the wrong jack...

Страница 23: ...t your phone line is digital You may have devices between the modem and the phone jack There should be no line splitters fax machines or other devices between the modem and the wall jack If you have a Macintosh modem make sure that your DIP switches are set at 1 3 5 and 8 in the down or on position In addition D0 should be in your initialization string The modem is able to dial out and attempts to...

Страница 24: ...ved a V 90 connection Our research shows that the vast majority of telephone lines in North America support 56K connections However due to unusual or old telephone line configurations some users will not be able to take full advantage of this technology It is important to remember that your line conditions may change so you may be able to make faster connections in the future To make sure that you...

Страница 25: ... which have V 90 servers attached to them d If you are able to connect at V 90 speeds on the 3Com BBS there may be something between you and your ISP that is preventing a V 90 connection from being negotiated You may want to contact your ISP and see if they have received similar reports from other customers e If you do not make a V 90 connection to our BBS your line might not be capable of support...

Страница 26: ... click Control Panel Double click the Modems icon Highlight your modem and click Properties Click the Connection tab and then click the Advanced button In the Extra Settings text box type X3 This will enable your modem to bypass the dial tone and attempt to dial out If you have voice mail on the same line that the modem is using the voice mail system may alter the dial tone to indicate that messag...

Страница 27: ...no group containing the title Dial Up Networking this means that it is not installed on the system If you have already installed Dial Up Networking skip to Configuring Dial Up Networking Installing Dial Up Networking To add dial up networking start by clicking Start pointing to Settings and clicking Control Panel Then click Add Remove Programs Click the Windows Setup tab Next select Communications...

Страница 28: ...on section for the Dial Up Adapter If the Dial Up Adapter is not installed click Add and then click Adapter Click Microsoft and then click Dial Up Adapter Click OK Next click Start point to Programs and click Accessories Click Dial Up Networking and then double click Make New Connection You are now asked to enter a name for the connection and select the modem you wish to use Fill in the name field...

Страница 29: ...rking program group click once on the Dial Up account you just created Click File and select Properties The My Connections screen should appear Click the Server Types tab We recommend unchecking the NetBEUI and IPX SPX Compatible boxes if you are connecting to an Internet provider If you are connecting to a Remote Access Service RAS and will be attaching to a Microsoft Novell or other network you ...

Страница 30: ... assigned IP address is selected This is usually the way an Internet provider will work unless you request a specific one Name Server Setting Your access provider provides you with a specific DNS entry DNS entries are what you use to be routed to the Internet and other locations If this is the case make sure that Specify name server address is checked and fill in the Primary DNS and if given the S...

Страница 31: ...rompt for a callback number then you can have the system call you back by entering your phone number RAS systems can also be set up for auto callback without asking for a number In this case the number is pre defined at the server end This is usually done to protect the system from unauthorized people getting in Note If you encounter any connection problems after setup is complete you should check...

Страница 32: ... 15 seconds Then turn the computer back on Windows may detect your modem upon this restart even if it did not detect the modem during the initial installation If you see screens indicating that new hardware has been detected by Windows continue with instructions on the installation map included with your modem If you do not see the new hardware screens continue with step 2 below 2 Click Windows St...

Страница 33: ...s using the same COM port or IRQ as your modem and is causing a conflict This is resulting in system lock ups and or loss of data Possible Solutions Your modem can be set to the following IRQs IRQ 2 3 4 5 or 7 and in some models IRQ 10 11 12 and 15 can be used The IRQs available for your modem to use depend on your computer setup Each IRQ on your computer is assigned a peripheral device or other f...

Страница 34: ...COM1 5 Sound Parallel Port 2 LPT2 6 Disk Controller All internal floppy drives 7 Parallel Port 1 LPT1 8 Real time clock interrupt 9 Reserved 10 Reserved 11 Reserved As you can see above there are no default assignments for COM3 and COM4 In order to use COM3 or COM4 you must assign it to an IRQ This means sharing that IRQ with ...

Страница 35: ...or COM4 you must assign these COM ports to an IRQ through Windows or your DOS communications software Before running your software you must first re install your modem with the right IRQ and COM port settings either jumpers or software set for Plug and Play devices Reinstalling your Modem Follow the instructions on the installation map which came with your modem Windows Applications If your commun...

Страница 36: ...r that port unless you disable it in the system BIOS The reason this happens is that the external connector uses a serial interface card which reserves COM2 and IRQ3 for the external connector If you do not plan to use the external COM2 connector most computers will let you disable it consult your computer s user guide or its manufacturer s technical support Your internal modem may then be install...

Страница 37: ... use Microsoft s Diagnostics program Using Microsoft Diagnostics Microsoft Diagnostics is a program included with most versions of MS DOS This program tells you what is installed on each COM port and IRQ Simply type MSD at the DOS prompt If you are in Windows 3 1 or Windows for Workgroups exit Windows completely then run MSD If you are running Windows NT click Run then type WINMSD For Windows 95 u...

Страница 38: ...M ports or other settings you should contact your computer manufacturer or software manufacturer If you are sure that there are no conflicts in your system and your 3Com U S Robotics modem still does not function please contact our technical support department for further assistance Winmodems Only Windows never detected the modem Possible Solutions Make sure the system has a free COM port or IRQ t...

Страница 39: ...TDS0 the last digit is a zero and press ENTER NOTE ATDS0 the last digit is a zero automatically dials 1 847 262 6000 the 3Com BBS If this is your first time connecting to our BBS you will be asked to enter your name create a password of your choice and to fill out a questionnaire The BBS gives you access to customer and technical support documents and the BBS library The library contains hundreds ...

Страница 40: ...in an index of available documents send a blank e mail to support usr com To have a specific document e mailed to you send the document s number in the subject field World Wide Web A 3Com Web page containing the same information as the Internet on Demand listing Log on to http www usr com home online CompuServe Access the same information as the Internet FTP site The 3Com forum address is GO THREE...

Страница 41: ...f your ati7 screen available Customer Support via the Phone Technical questions about 3Com modems can also be answered by technical support specialists NOTE If you can have your ati7 information written down on a piece of paper before you call tech support Regular Phone Service 847 262 5151 8 00 am 6 00 pm CST Monday Friday Automated service is available 24 hours a day 7 days a week Priority No Ho...

Страница 42: ... an SRO Service Repair Order number You must have an SRO number before returning the modem to us Ship the unit postage paid in a strong box made of corrugated cardboard with plenty of packing material Do NOT send the modem back in the original box Send ONLY the modem NOT the power supply manuals CD ROM etc Include your SRO number name and address on the shipping label as well as inside the package...

Страница 43: ...uter program designed to perform a specific task or set of tasks Examples include word ARQ Automatic Repeat reQuest A function that allows be retransmitted See MNP V 42 ASCII American Standard Code for Information Interchange A code used to represent letters numbers and special characters such as and asynchronous transmission Data transmission in which the length of time between transmitted charac...

Страница 44: ...rate The number of binary digits or bits transmitted per second bps Communications channels using analog modems are established at set bit rates commonly 2400 4800 9600 14 400 28 800 and higher bits per second bps The bits binary digits per second rate Thousands of bits per second are expressed as kilobits per second kbps buffer A temporary memory area used as storage during input and output opera...

Страница 45: ...results of its tests in each data block in the form of a CRC code The receiving modem compares its results with the received CRC code and responds with either a positive or negative acknowledgment data communications The transmission or sharing of data between computers via an electronic medium data compression table A table containing values assigned for each character during a call under MNP5 da...

Страница 46: ...ual the term refers to the binary digits 0 and 1 DTE Data Terminal or Terminating Equipment A computer that generates or is the final destination of data duplex Indicates a communications channel capable of carrying signals in both directions See half duplex full duplex Electronic Industries Association EIA Group which defines electronic standards in the U S error control Various techniques that c...

Страница 47: ... at a time In microcomputer communications may refer to activation of the online local echo which causes the modem to send a copy of the transmitted data to the screen of the sending computer Hz Hertz a frequency measurement unit used internationally to indicate cycles per second Internet An electronic communications network that connects computer networks and organizational computer facilities ar...

Страница 48: ...als received from the phone line back to digital signals before passing them to the receiving computer nonvolatile memory NVRAM User programmable random access memory whose data is retained when power is turned off On the U S Robotics modem it includes four stored phone numbers and the modem settings off on hook Modem operations that are the equivalent of manually lifting a phone receiver taking i...

Страница 49: ... s RAM holds the current operational settings a flow control buffer and a command buffer remote digital loopback A test that checks the phone link and a remote modem s transmitter and receiver remote echo A copy of the data received by the remote system returned to the sending system and displayed on the screen Remote echoing is a function of the remote system ROM Read Only Memory Permanent memory...

Страница 50: ...on public switched telephone networks V 22 An ITU T standard for modem communications at 1200 bps compatible with the Bell 212A standard observed in the U S and Canada V 22 bis An ITU T standard for modem communications at 2400 bps The standard includes an automatic link negotiation fallback to 1200 bps and compatibility with Bell 212A V 22 modems V 27 ter An ITU T standard for facsimile operation...

Страница 51: ...bit rate of the receive channel by eliminating the analog to digital conversion commonly found in modem connections V 90 connections require a modem with V 90 or x2 technology calling a digitally connected Internet Service Provider or corporate host site compatible with V 90 or x2 technology World Wide Web A part of the Internet designed to allow easier navigation of the network through the use of...

Страница 52: ...dem An error checking protocol that can send several files of data at a time in 1024 byte 1K blocks This protocol can use either checksums or CRC for error checking Ymodem G Similar to Ymodem except it includes no error checking which makes it faster Zmodem Similar to Xmodem and Ymodem except it includes batch transfer the ability to recover from a partially complete transfer an autostart feature ...

Страница 53: ...8 2 Top of the Case Lights Voice Faxmodem Pro Externals 8 3 Typing Commands 8 4 Basic Data Commands 8 5 Extended Data Commands 8 12 DIP Switches 8 20 S Registers 8 22 Fax Commands 8 33 Screen Messages 8 36 The Serial Interface 8 37 Serial Interface Pin Definitions 8 38 ...

Страница 54: ... C0 RD Received Data Flashes when modem sends result codes or passes received data bits from remote SD Send Data Flashes when computer sends a data bit to modem TR Data Terminal Ready ON if modem receives a DTR signal from computer Always ON modem ignores DTR if the DTR override is ON D0 CS Clear to Send ON until modem lowers CTS when Transmit Data hardware flow control is enabled H1 H3 ARQ Error ...

Страница 55: ... What It Means When Lighted POWER The modem is turned on SEND The computer is sending a data bit to the modem RECEIVE The modem is sending result codes or passing received data bits from the remote ONLINE The modem is online NOTE This light blinks when the mute feature is being used ...

Страница 56: ...tions and you don t include a number zero is assumed For example if you type ATB the command ATB0 is assumed Every command except A and A must begin with the AT prefix and be entered by pressing ENTER The maximum command length is 58 characters The modem doesn t count the AT prefix carriage returns or spaces NOTE All defaults are based on the F1 Hardware Flow Control template loaded in NVRAM when ...

Страница 57: ... operations A Re executes the last issued command Used mainly to re dial Does not require the AT prefix or a Carriage Return A Re executes the last issued command continuously until the user intervenes or the command is executed forever Does not require the AT prefix or a Carriage Return Any key Aborts off hook dial answer operation and hangs up AT Required command prefix except with A and A Use a...

Страница 58: ...M at position n n 0 3 Phone numbers are stored with the Zn s command T Tone dial Comma Pause See S8 definition which it s linked to Semicolon Return to Command mode after dialing Dials the letters that follow in an alphabetical phone number Exclamation point Flashes the switch hook Delays for 125 ms before proceeding with dial string W Wait for second dial tone X2 or X4 linked to S6 register Dials...

Страница 59: ...cho of data it receives Hn Controls ON OFF hook H0 Hangs up goes on hook H1 Goes off hook In Displays the following information I0 Four digit product code I1 Results of ROM checksum I2 Results of RAM checksum I3 Product type I4 Current modem settings I5 Nonvolatile memory NVRAM settings I6 Link diagnostics I7 Product configuration I9 Plug and Play information I11 Extended link diagnostics Ln Contr...

Страница 60: ...ial for phone lines that don t support touch tone dialing Qn Displays suppresses result codes Q0 Displays result codes Q1 Quiet mode no result codes Q2 Displays result codes only in Originate mode Sr b n Sets bit b of register r to n 0 OFF or 1 ON Sr n Sets register r to n Sr Displays contents of S Register r S Displays a list of the S Registers T Sets tone dial Vn Displays verbal numeric result c...

Страница 61: ...90 products Result Codes X0 X1 X2 X3 X4 0 OK 1 CONNECT 2 RING 3 NO CARRIER 4 ERROR 5 CONNECT 1200 6 NO DIAL TONE 7 BUSY 8 NO ANSWER 9 Reserved 10 CONNECT 2400 13 CONNECT 9600 18 CONNECT 4800 20 CONNECT 7200 21 CONNECT 12000 25 CONNECT 14400 43 CONNECT 16800 85 CONNECT 19200 91 CONNECT 21600 99 CONNECT 24000 103 CONNECT 26400 107 CONNECT 28800 151 CONNECT 31200 155 CONNECT 33600 ...

Страница 62: ...ONNECT 37333 280 CONNECT 38666 284 CONNECT 40000 188 CONNECT 41333 192 CONNECT 42666 196 CONNECT 44000 200 CONNECT 45333 204 CONNECT 46666 208 CONNECT 48000 212 CONNECT 49333 216 CONNECT 50666 220 CONNECT 52000 224 CONNECT 53333 228 CONNECT 54666 232 CONNECT 56000 236 CONNECT 57333 Adaptive Dialing Wait for 2nd Dial Tone W Wait for Answer Fast Dial Requires in dial string replaces NO CARRIER ...

Страница 63: ...uration 0 Y3 Use factory configuration 1 Y4 Use factory configuration 2 Z Resets modem Z0 Resets modem to NVRAM profile selected by Y command or dip 7 Z1 Resets modem to NVRAM profile 0 Z2 Resets modem to NVRAM profile 1 Z3 Resets modem to factory default profile 0 F0 Z4 Resets modem to factory default profile 1 F1 Z5 Resets modem to factory default profile 2 F2 ...

Страница 64: ...n Bn Manages modem s serial port rate B0 Variable follows connection rate B1 Fixed serial port rate B2 Fixed in ARQ mode variable in non ARQ mode Cn Controls Carrier Detect CD signal C0 CD override C1 Normal CD operations Dn Controls Data Terminal Ready DTR operations D0 DTR override D1 DTR toggle causes online Command mode D2 Normal DTR operations D3 Resets on receipt of DTR Fn Loads a read only ...

Страница 65: ... disabled H1 Hardware flow control Clear to Send CTS H2 Software flow control XON XOFF H3 Hardware and software flow control In Sets Receive Data RD software flow control see also Rn I0 Software flow control disabled I1 XON XOFF signals to your modem and remote system I2 XON XOFF signals to your modem only Kn Enables disables data compression K0 Data compression disabled K1 Auto enable disable K2 ...

Страница 66: ...junction with Un and Un is greater than 0 Nn sets the ceiling connect speed Un sets the floor connect speed see also the table in the Un section NOTE N17 through N39 apply only to V 90 products N0 Connection speed is determined by the remote modem N1 300 bps N2 1200 bps N3 2400 bps N4 4800 bps N5 7200 bps N6 9600 bps N7 12 000 bps N8 14 400 bps N9 16 800 bps N10 19 200 bps N11 21 600 bps N12 24 00...

Страница 67: ... N33 49 333 bps N34 50 666 bps N35 52 000 bps N36 53 333 bps N37 54 666 bps N38 56 000 bps N39 57 333 bps Pn Sets pulse rotary dial make break ratio P0 U S Canada ratio 39 61 P1 U K ratio 33 67 Rn Sets Receive Data RD hardware flow control Request to Send RTS see also Hn R0 Reserved R1 Modem ignores RTS R2 Received Data to computer only on RTS Sn Controls Data Set Ready DSR operations S0 DSR overr...

Страница 68: ... value chosen from the table sets the floor connect speed the lowest acceptable connect speed If a connection cannot be made at or above this speed the modem will hang up This command can also be used in conjunction with Nn NOTE U17 through U39 apply only to V 90 products N 0 N 0 U 0 Connects at Connects at a best possible speed at or below speed between Nn your modem and the remote modem NOTE The...

Страница 69: ... bps U12 24 000 bps U13 26 400 bps U14 28 800 bps U15 31 200 bps U16 33 600 bps U17 28 000 bps U18 29 333 bps U19 30 666 bps U20 32 000 bps U21 33 333 bps U22 34 666 bps U23 36 000 bps U24 37 333 bps U25 38 666 bps U26 40 000 bps U27 41 333 bps U28 42 666 bps U29 44 000 bps U30 45 333 bps U31 46 666 bps U32 48 000 bps U33 49 333 bps U34 50 666 bps U35 52 000 bps U36 53 333 bps U37 54 666 bps U38 5...

Страница 70: ...edited Y3 Nondestructive unexpedited Zn s Writes phone number string s to NVRAM at position n n 0 3 Zn L Writes last executed dial string to NVRAM at position n n 0 3 Zn Displays the phone number stored at position n n 0 3 ZL Displays the last executed dial string CID n Controls Caller ID feature CID 0 Caller ID disabled CID 1 Caller ID enabled with formatted information CID 2 Caller ID enabled wi...

Страница 71: ...DTR signal for the modem to accept commands dropping DTR terminates a call ON Modem ignores DTR Override 2 OFF Verbal Numeric Result Codes OFF Verbal word results ON Numeric results 3 ON Result Code Display OFF Suppresses result codes ON Enables result codes 4 OFF Command Mode Local Echo Suppression OFF Displays keyboard commands ON Suppresses echo 5 ON Auto Answer Suppression OFF Modem answers on...

Страница 72: ...ther modem drops CD on disconnect ON CD always ON Override 7 OFF Power on and ATZ Reset Software Defaults OFF Loads Y0 Y4 configuration from user defined nonvolatile memory NVRAM ON Loads F0 Generic template from read only memory ROM 8 ON AT Command Set Recognition OFF Disables command recognition dumb mode ON Enables recognition smart mode ...

Страница 73: ...unts and stores the number of rings from an incoming call S0 must be greater than 0 S2 43 Stores the ASCII decimal code for the escape code character Default character is A value of 128 255 disables the escape code S3 13 Stores the ASCII code for the Carriage Return character Valid range is 0 127 S4 10 Stores the ASCII decimal code for the Line Feed character Valid range is 0 127 S5 8 Stores the A...

Страница 74: ...S9 6 Sets the required duration in tenths of a second of the remote modem s carrier signal before recognition by the 3Com U S Robotics modem S10 14 Sets the duration in tenths of a second that the modem waits to hang up after loss of carrier This guard time allows the modem to distinguish between a line disturbance from a true disconnect hang up by the remote modem Note If you set S10 255 the mode...

Страница 75: ...wer on reset autodial the number stored in NVRAM at position 0 5 32 Reserved 6 64 Disable quick retrains 7 128 Disconnect on escape code The 1 5K byte non ARQ buffer allows data transfer with Xmodem and Ymodem type file transfer protocols without using flow control The 128 byte option lets remote users with slower modems keep data you re sending from scrolling off their screens When remote users s...

Страница 76: ...e ARQ MNP for V 22 1 2 Disable ARQ MNP for V 22bis 2 4 Disable ARQ MNP V 32 V 32bis 3 8 Disable MNP handshake 4 16 Disable MNP level 4 5 32 Disable MNP level 3 6 64 MNP incompatibility 7 128 Disable V 42 operation To disable V 42 detect phase select the total of the values for bits 3 and 7 in other words S15 136 the sum of values 8 and 128 S16 0 Reserved S17 0 Reserved ...

Страница 77: ...up S19 0 disables the timer S20 0 Reserved S21 10 Sets the length in 10 millisecond units of breaks sent from the modem to the computer applies to MNP or V 42 mode only S22 17 Stores the ASCII decimal code for the XON character S23 19 Stores the ASCII decimal code for the XOFF character S24 0 Reserved S25 20 Sets the duration in hundredths of a second that DTR must be dropped so that the modem doe...

Страница 78: ...nables unencoded non trellis coded modulation in V 32 mode 2 4 Disables V 32 modulation 3 8 Disables 2100 Hz answer tone to allow two V 42 modems to connect faster 4 16 Enables V 23 fallback mode 5 32 Disables V 32bis mode 6 64 Disable V 42 selective reject 7 128 Software compatibility mode This setting disables the codes and displays the 9600 code instead The actual rate of the call can be viewed...

Страница 79: ...0 bps S29 20 Sets the duration in tenths of a second of the V 21 answer mode fallback timer S30 0 Reserved S31 128 Reserved S32 2 Bit mapped register setup To set the register see the instructions for S13 Bit Value Result 0 1 V 8 Call Indicate enabled 1 2 Enables V 8 mode 2 4 Reserved 3 8 Disable V 34 modulation 4 16 Disable V 34 modulation 5 32 Disable x2 modulation 6 64 Disable V 90 modulation 7...

Страница 80: ...isable 3000 symbol rate 4 16 Disable 3200 symbol rate 5 32 Disable 3429 symbol rate 6 64 Reserved 7 128 Disable shaping S34 0 Bit mapped register setup To set registers see instructions for S13 Bit Value Result 0 1 Disable 8S 2D trellis encoding 1 2 Disable 16S 4D trellis encoding 2 4 Disable 32S 2D trellis encoding 3 8 Disable 64S 4D trellis encoding 4 16 Disable non linear coding 5 32 Disable TX...

Страница 81: ...TECHNICAL REFERENCE 8 30 7 128 Disable Pre coding ...

Страница 82: ...ately hangs up when DTR drops This option only applies to connections terminated by dropping DTR If the modem receives the ATH command it ignores S38 and immediately hangs up S39 S40 Reserved S41 0 Bit mapped register setup To set registers see instructions for S13 Bit Value Result 0 1 Distinctive ring enabled 1 2 Speakerphone connect message override voice products only 2 4 Disable Digital Line G...

Страница 83: ...TECHNICAL REFERENCE 8 32 S42 0 Reserved ...

Страница 84: ...Then the modem waits for a specified time before OK appears on screen The pause is set in 10 millisecond intervals n is the number of 10 millisecond intervals that pass before OK appears n 0 255 FRS n Makes the modem wait for a specified length of silence before sending OK to the screen The pause is set in 10 millisecond intervals n is the number of 10 millisecond intervals that pass before OK app...

Страница 85: ...121 122 145 or 146 Note See the Screen Messages table at the end of this section for an explanation of messages that appear in response to this command FTH n Transmits data framed in the HDLC protocol using the modulation specified by n n 3 24 48 72 96 97 98 121 122 145 or 146 Note See the Screen Messages table at the end of this section for an explanation of messages that appear in response to th...

Страница 86: ...TECHNICAL REFERENCE 8 35 Note See the Screen Messages table at the end of this section for an explanation of messages that appear in response to this command ...

Страница 87: ...ceipt of a network altering ring 3 NO CARRIER No carrier is being received from the modem 4 ERROR The previous command line has not been recognized or was completed abnormally 6 NO DIAL Optional Dial tone was not received within TONE the time out period 7 BUSY Optional A busy signal was deleted 64 CONNECT FAX Optional The modem has established a fax connection This response is used only when the f...

Страница 88: ...smitted between the devices over a shielded serial cable with a 25 pin male DB 25 connector to the modem and a 25 pin 9 pin 8 pin or custom built connector to the computer FCC regulations require the use of a shielded cable when connecting a modem to a computer to ensure minimal interference with radio and television Pin assignments are factory set in the U S Robotics modem to match the standard D...

Страница 89: ... AA Chassis Ground Both 2 3 BA Transmitted Data Computer 3 2 BB Received Data Modem 4 7 CA Request to Send Computer 5 8 CB Clear to Send Modem 6 6 CC Data Set Ready Modem 7 5 AB Signal Ground Both 8 1 CF Carrier Detect Modem 12 SCF Speed Indicate Modem 20 4 CD Data Terminal Ready Computer 22 9 CE Ring Indicate Modem ...

Страница 90: ...forms to the FCC s specifications Part 15 Operation is subject to the following two conditions 1 this device may not cause harmful electromagnetic interference and 2 this device must accept any interference received including interference that may cause undesired operations This equipment uses the following USOC jacks RJ 11C Part 68 This equipment complies with FCC Rules Part 68 Located on the bot...

Страница 91: ...rd and modular plug are provided with this equipment which is designed to connect to the telephone network or premises wiring using a Part 68 compliant compatible jack See installation instructions for details Caution to the User The user is cautioned that any changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equi...

Страница 92: ...d with the product Radio and Television Interference This equipment generates and uses radio frequency energy and if not installed and used properly in strict accordance with the manufacturer s instructions may cause interference to radio and television reception The modem has been tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Pa...

Страница 93: ...ng booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems Stock No 004 000 0345 4 U S Government Printing Office Washington DC 20402 In accordance with Part 15 of the FCC rules the user is cautioned that any changes or modifications to the equipment described in this manual that are not expressly approved by 3Com could void the ...

Страница 94: ...be aware that compliance with the above conditions may not prevent degradation of service in some situations Currently telecommunication companies do not allow users to connect their equipment to jacks except in precise situations that are spelled out in tariffing arrangements with those companies Repairs to certified equipment should be coordinated by a representative designated by the supplier A...

Страница 95: ...stère n assure toutefois pas que le matériel fonctionnera à la satisfaction de l utilisateur Avant d installer ce matériel l utilisateur doit s assurer qu il est permis de le raccorder aux installations de l entreprise locale de télécommunication Le matériel doit également être installé en suivant une méthode acceptée de raccordement L abonné ne doit pas oublier qu il est possible que la conformit...

Страница 96: ...echnologies 25 Royal Crest Court Suite 200 Markham ONT L3R 9X4 3Com Corporation Limited Warranty 3Com warrants this hardware product to be free from defects in workmanship and materials under normal use and service for the lifetime of the product from the date of purchase from 3Com or its authorized reseller 3Com s sole obligation under this express warranty shall be at 3Com s option and expense t...

Страница 97: ...eption of those products identified at 3Com s Web site http www 3com com products yr2000 html as not meeting this standard If it appears that any product that is stated to meet this standard does not perform properly with regard to such date data on and after January 1 2000 and Customer notifies 3Com before the later of April 1 2000 or ninety 90 days after purchase of the product from 3Com or its ...

Страница 98: ...hey be insured or sent by a method that provides for tracking of the package The repaired or replaced item will be shipped to Customer at 3Com s expense not later than thirty 30 days after 3Com receives the defective product Return the product to 3Com SRO ______________ Attn Dock 15 PCD 1800 W Central Ave Mt Prospect IL 60056 3Com shall not be responsible for any software firmware information or m...

Страница 99: ...HICH ARE EXPRESSLY DISCLAIMED 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE INSTALLATION MAINTENANCE OR USE OF ITS PRODUCTS 3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER S OR ANY THIRD PERSON S ...

Страница 100: ... HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND LIMITS ITS LIABILITY TO REPAIR REPLACEMENT OR REFUND OF THE PURCHASE PRICE PAID AT 3COM S OPTION THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE DISCLAIMER Some countries states or provinces do not allow the exclusion or limitation of implied warranties or the li...

Страница 101: ...egal rights which may vary depending on local law GOVERNING LAW This Limited Warranty shall be governed by the laws of the State of California U S A excluding its conflicts of laws principles and excluding the United Nations Convention on Contracts for the International Sale of Goods ...

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