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5   Solving Problems

63

Introduction

Your MultiModemZDX modem was thoroughly tested at the factory be-
fore it was shipped. If you are unable to make a successful connection,
or if you experience data loss or garbled characters during your connec-
tion, it is possible that the modem is defective. However, it is more likely
that the source of your problem lies elsewhere. The following symptoms
are typical of problems you may encounter:

• None of the LEDs light when the modem is on.

• The modem does not respond to commands.

• The modem dials but cannot connect.

• The modem disconnects while online.

• The modem cannot connect when answering.

• File transfer is slower than it should be.

• Data is being lost.

• There are garbage characters on the monitor.

• Fax and data programs can’t run at the same time.

If you experience problems, please check the following possibilities be-
fore calling Technical Support (see Appendix C).

None of the LEDs Light When the Modem Is On

When you turn on the ZDX, the LED indicators on the front panel should
flash briefly as the modem runs a self-test. If the LEDs remain off, the
modem is probably not receiving power.

4

Make sure the modem’s power switch is on, especially if you nor-

mally turn on the modem by turning on a power strip.

4

If the power supply is plugged into a power strip, make sure the

power strip is plugged in and its power switch is on.

Содержание MT2834DXK

Страница 1: ...e or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Plug the equipment into an outlet on a circuit different from...

Страница 2: ...82034908...

Страница 3: ...Description I 3 5 99 Updated agency technical support BBS and Internet sections added URLs deleted CompuServe section Trademarks MultiModem MultiModemZDX Multi Tech and the Multi Tech logo are trade...

Страница 4: ...Connection 10 PHONE Connection 10 POWER Connection 11 Power On Test 11 Step 3 Install the Modem in Windows 12 Adding the Modem to Windows 12 Removing Your Old Modem from Windows 13 Step 4 Install and...

Страница 5: ...63 None of the LEDs Light When the Modem Is On 63 The Modem Does Not Respond to Commands 64 The Modem Dials But Cannot Connect 67 The Modem Disconnects While Online 69 The Modem Cannot Connect When A...

Страница 6: ...nd Telecom Warning Notice 83 Use of Supplied Power Transformer 83 Appendix B Technical Specifications 85 Appendix C Warranty Service and Technical Support Limited Warranty 89 Service 90 Technical Supp...

Страница 7: ...Contents ix...

Страница 8: ...x Quick Reference Guide...

Страница 9: ...1 Introduction...

Страница 10: ...Quick Reference Guide 2...

Страница 11: ...for the MT2834ZDX standard MT2834ZDXb 33 600 bps MT2834ZDXK UK and MT2834ZDXI international versions of the modem Except where specifically noted references to the MT2834ZDX should be understood to ap...

Страница 12: ...e MT2834ZDX data fax modem One DC power supply One set of four plastic feet Two sets of Velcro fasteners One telephone cable A communications software disk This Quick Reference Guide If any of these i...

Страница 13: ...2 Quick Start...

Страница 14: ...Quick Reference Guide 6...

Страница 15: ...A DC power supply module One set of four plastic feet Two sets of hook and loop fasteners One telephone cable A communication software disk This Quick Reference Guide You supply A computer with an un...

Страница 16: ...less type during an electri cal storm There may be a remote risk of electrical shock from lightning Do not use a telephone in the vicinity of a gas leak Step 1 Place the Modem Place the modem near you...

Страница 17: ...Connect the Modem to Your System Placing the MT2834ZDX in a convenient location connect it to your computer s serial port to the telephone line to AC power and option ally to your telephone Figure 2 2...

Страница 18: ...not interchangeable with the PHONE jack Do not plug the phone into the LINE jack or the line cable into the PHONE jack Note The Federal Communications Commission FCC Industry Canada and the British Ap...

Страница 19: ...mage the modem Power On Test Test the modem by turning it on a power on off switch is located on the right side When you apply power the modem performs a diagnostic self test indicated by the speed in...

Страница 20: ...ur computer or the serial cable may be faulty See None of the LEDs Light When the Modem Is Turned On and The Modem Does Not Respond to Commands in Chapter 7 of the User Guide Solving Problems 2 If Win...

Страница 21: ...e the application connection de scriptions one at a time it is easier to force Windows applications to use the new modem by removing the old modem from Windows 1 Click the Start button point to Settin...

Страница 22: ...and in Trio select View Datacomm Communications Setup Modem Select from List 4 Choose your modem from the software s modem list If it isn t listed choose a generic modem and modify the settings as nec...

Страница 23: ...ows 95 or NT 4 0 or set it to 57 600 bps if it has Windows 3 1x If you have an older computer with a 14550 UART set it to 19 200 bps Older Macintosh computers can use a serial port baud rate of 57 600...

Страница 24: ...t then choose Programs Accessories and HyperTer minal 2 Start HyperTerminal by double clicking on the Hypertrm icon Hy perTerminal asks for the name of the connection 3 Type Multi Tech BBS in the Name...

Страница 25: ...le Menu and News For help with menu commands type 11 In the Main Menu type F and press ENTER to access the File Menu then type D and press ENTER to download 12 At the file name prompt type zdxhelp hlp...

Страница 26: ...hen click Save and save as multibbs trm 4 Click Phone then click Dial to dial the BBS You will know you have reached a modem by the harsh sounds of the modem handshake 5 When the BBS welcome screen ap...

Страница 27: ...the folder into which you downloaded the ZDXHELP HLP file 2 Move the file to a permanent location on your hard drive 3 Double click on the Zdxhelp icon to run MultiModemZDX Help 4 Press F1 for help in...

Страница 28: ...tion configuration and trouble shooting in particular The following Web sites are good places to start Costmo s Other Resources Page http modems rosenet net or Curt s High Speed Modem Page http elaine...

Страница 29: ...3 Features...

Страница 30: ...Quick Reference Guide 22...

Страница 31: ...nternet an international computer network of universities libraries businesses and government agencies Like the commercial online services the Internet provides e mail services public message areas an...

Страница 32: ...0 16 800 14 400 12 000 9600 7200 4800 2400 1200 and 300 bps for communicating with older modems as well as with other V 34 modems Automatic fallback to slower speeds in noisy line conditions and fall...

Страница 33: ...ISI608 eight ports A 16550AFN UART can safely handle data at rates up to 115 200 bps Almost all Macintoshes can handle data rates up to 57 000 bps while the newer ones can handle data rates up to 115...

Страница 34: ...ctor or your local telephone company to do the work If you want a separate line for your fax modem you must contact your telephone company Communications Software To operate the MT2834ZDX you must hav...

Страница 35: ...he serial port connectors on the back of your comput er On an IBM PC or compatible there are usually two serial ports named COM1 and COM2 COM1 typically uses a DB 9 connector whereas COM2 may use a DB...

Страница 36: ...ons Commission FCC Industry Can ada and the British Approvals Board for Telecommunications BABT impose certain restrictions on equipment connected to public telephone systems See Appendix A for more i...

Страница 37: ...28 indicator should light If this does not happen check that the power switch is on the power supply is solidly connected and the AC outlet is live Surge Protectors and Lightning Power surges and oth...

Страница 38: ...on pin 3 of the RS 232C V 24 interface Carrier Detect The CD LED lights when the modem detects a valid carrier signal from another modem It is on when the modem is communicating with the other modem...

Страница 39: ...it goes off a connected modem will disconnect The state of the TR LED matches that of the DTR circuit on pin 20 of the RS 232C V 24 interface Error Correction V 42 The EC LED lights continuously when...

Страница 40: ...Blink Rates The 28 33 14 and 96 speed indicators light singly or in combination to indicate data rates Data rates for the ZDX are shown in the following table Data rates for the ZDXb are shown on the...

Страница 41: ...4 AT Commands S Registers Result Codes...

Страница 42: ...Quick Reference Guide 34...

Страница 43: ...l command lines except A A and escape codes Command RETURN Key Values n a Description Press the RETURN ENTER key to execute most commands Command A Force Answer Mode Values n a Description Answer call...

Страница 44: ...of a reliable connection Command An Auto Speed Detection in Answer Mode Values n 0 3 Default 0 Description A0 Start at maximum speed and fall back to a lower speed 26400 24000 21600 19200 16800 14400...

Страница 45: ...independent of modem data rate BA1 Set baud adjust on speed conversion off Serial port speed is same as modem data rate Command Cn Carrier Detect Control Values n 0 1 2 or 4 Default 1 Description C0 F...

Страница 46: ...l string s then N followed by directory number d Example ATDT9 5551212N1 Command Dn Data Terminal Ready Control Values n 0 3 Default 2 ZDX ZDXI ZDXK 0 ZDX Mac ZDXK Mac Description D0 Modem ignores DTR...

Страница 47: ...ta in graph format Y axis is gain shown in dBm DF1 Display data in table format Gain is shown numerically in dBm at 75Hz increments from 150Hz to 3750Hz Command DPn Read Line Probe Data Values n 0 or...

Страница 48: ...le mode V 42 enabled Command En Modem Initiated Flow Control Values n 3 4 or 5 Defaults 4 Description E3 Flow control disabled E4 CTS RTS hardware flow control E5 XON XOFF software flow control Comman...

Страница 49: ...n 12 or 13 Default 13 Description E12 Pacing disabled E13 Pacing enabled Command En Data Compression Values n 14 or 15 Default 15 Description E14 Data compression disabled E15 Data compression enabled...

Страница 50: ...if F8 was previously stored load user default values from non volatile memory if F9 was previously stored F8 Read factory default values when F is issued effective only if you store F8 using W0 F9 Rea...

Страница 51: ...n F0 No fallback when on line F1 Fall back decrementally from maximum speed to 4800 bps as line conditions deteriorate F2 Fall back decrementally to 4800 bps fall forward when line conditions improve...

Страница 52: ...word 6 10 characters Default MULTI TECH Description Enters the remote configuration login password Command I x Store Login Password Values x password 6 10 characters Default MULTI TECH Description Sto...

Страница 53: ...ixed by an AT e g ATL10 Command Ln V 42 Mode Selection in Originate Mode Values n 0 1 2 or 3 Default 0 Description L0 Modems negotiate V 42 mode L1 MNP on LAP M off L2 LAP M on MNP off L3 Disable dete...

Страница 54: ...riginate call at 14 400 bps MB16800 Originate call at 16 800 bps MB19200 Originate call at 19 200 bps MB28800 Originate call at 28 800 bps MB33600 Originate call at 33 600 bps ZDXb only Command Nd Dia...

Страница 55: ...ake pulse ratio Note The ZDXK is locked to a 67 33 pulse ratio P1 Command Qn Result Codes Enable Disable Values n 0 1 or 2 Default 0 Description Q0 Enable result codes Q1 Disable result codes quiet Q2...

Страница 56: ...CTS drop on disconnect for time set by S24 then go high again Command RAn Asymmetrical Bit Rate Values n 0 or 1 Default 0 Description RA0 Enable asymmetrical bit rate in V 34 mode RA1 Disable asymmetr...

Страница 57: ...1 is selected Valid only when on line in V 34 mode Command RR Immediate Retrain Values n a Description Forces the modem to perform an immediate retrain while on line You must escape to command mode to...

Страница 58: ...DSR CD Interaction Control Values n 0 or 1 Default 0 Description SF0 Select DSR to follow CD SF1 Select DSR to be independent Command SBn Serial Port Baud Rate Values n speed Default 57600 Description...

Страница 59: ...mote configuration setup password Command T Tone Dial Values n a Default P command Description Modem will tone dial numbers following a T in the dialing command Command Tn Respond to Remote Digital Lo...

Страница 60: ...sult codes sent as words verbose response Command Vn V 32terbo Handshake Tones Values n 0 or 1 Default 1 Description V0 Include V 32terbo tones in handshake V1 Exclude V 32terbo tones from handshake C...

Страница 61: ...l X3 Extended result codes with BUSY does not look for dial tone X4 Extended result codes with NO DIALTONE and BUSY Command Xn Number of XOFF Characters Sent Values n 0 or 1 Default 0 Description X0 S...

Страница 62: ...ial command a colon causes continuous redial of a number 10 in DOC modems until answered Not used in ZDXK or ZDXI modems Command Return to Command Mode Values n a Description Placed at end of dial com...

Страница 63: ...guration escape character is defined in register S13 Command AT CR Escape Code Values n a Description Puts modem in command mode and optionally issues a command while remaining on line Enter AT up to...

Страница 64: ...t have occurred S2 decimal 0 127 43 Sets ASCII code for the escape code character S3 decimal 0 127 13 M Sets ASCII code for the RETURN character S4 decimal 0 127 10 J Sets ASCII code for the LINE FEED...

Страница 65: ...loss of carrier S11 1 ms 1 255 70 Sets spacing and duration 80 255 80 of dialing tones 50 ms is 80 255 80 the recommended minimum S13 decimal 0 1 127 37 Sets ASCII code for remote configuration escape...

Страница 66: ...of com acter mand characters allowed after AT S36 1 sec 0 1 255 5 Sets the time between DTR inactive and modem off hook S36 0 disables DTR busy out S37 1 sec 0 255 5 Sets the time between DTR active...

Страница 67: ...ONNECT 1 CONNECT 2 RING 2 RING 3 NO CARRIER 3 NO CARRIER 4 ERROR 4 ERROR 5 CONNECT 1200 5 CONNECT 1200 6 NO DIALTONE 6 NO DIAL TONE 7 BUSY 7 BUSY 8 NO ANSWER 8 NO ANSWER 9 CONNECT 2400 10 CONNECT 2400...

Страница 68: ...Quick Reference Guide 60...

Страница 69: ...5 Solving Problems...

Страница 70: ...Quick Reference Guide 62...

Страница 71: ...nline The modem cannot connect when answering File transfer is slower than it should be Data is being lost There are garbage characters on the monitor Fax and data programs can t run at the same time...

Страница 72: ...one designed for another product as it can damage the modem and void your warranty The Modem Does Not Respond to Commands 4 Make sure the modem is plugged in and turned on See None of the Indicators L...

Страница 73: ...tation to make sure Or you might have selected a COM port in the program other than the one the modem is physically connected to compare the settings in the program to the physical connection 4 If the...

Страница 74: ...Device Manager tab dou ble click on Ports then double click the communications port your modem is connected to In the port s Properties dialog box click the Resources tab to see the port s input outpu...

Страница 75: ...led by default If they have been dis abled include V1X4 in the modem s initialization string or in terminal mode enter ATV1X4 and press ENTER When you dial again the mo dem will report the call s prog...

Страница 76: ...the dial prefix you do not have to include it in each directory entry To change the dial prefix in Windows 95 HyperTerminal select Connect from the Call menu click Dialing Properties and type 9 in th...

Страница 77: ...s 95 HyperTerminal select Connect from the Call menu click Dialing Properties check This location has Call Waiting and select the correct code for your phone service 4 If you have extension phones on...

Страница 78: ...MultiModemZDX Help 4 If you are using a slow transfer protocol such as Xmodem or Ker mit try Zmodem or Ymodem G instead 4 Is your line noisy If there is static on your line the modem has to resend ma...

Страница 79: ...and have a 16550AFN UART you might need to turn on the 16550 s data buffers and or replace the Windows serial driver COMM DRV See The 16550 UART and Windows 3 1 in the MultiModemZDX Help file 4 Try e...

Страница 80: ...ostics listing and check ing for parameters that may be unacceptable number of retrains round trip delay etc Fax and Data Programs Can t Run at the Same Time 4 Communications devices can be accessed b...

Страница 81: ...Appendixes...

Страница 82: ...Quick Reference Guide 74...

Страница 83: ...s 4 The ringer equivalence number REN is used to determine the number of devices that may be connected to the telephone line Excessive RENs on the telephone line may result in the device not ringing i...

Страница 84: ...may request you remove the equipment from the network until the problem is resolved 8 No repairs are to be made by you Repairs are to be made only by Multi Tech Systems or its licensees Unauthorized...

Страница 85: ...y or other individual sending the message Telephone number of the sending machine or such business other entity or individual This information is to appear in a margin at the top or bottom of each tra...

Страница 86: ...connected to the facilities of the local telecommunications company The equipment must also be installed using an acceptable method of connection The customer should be aware that compliance with the...

Страница 87: ...ion is made Telephones that connect to the external socket must be approved for direct connection to the Public Switched Telephone Network PSTN This apparatus has been approved for the use of the foll...

Страница 88: ...ear to the equipment and shall be easily accessible The plug that connects the apparatus to the mains power supply must be fitted with a 5A fuse that complies with BS1362 EMC Safety and Terminal Direc...

Страница 89: ...e event of problems you should contact your equipment supplier first Australian Modem Warning Notice Modems connected to the Australian telecommunications network must have a valid AUSTEL permit This...

Страница 90: ...ns software used with the modem to the values shown above will result in the modem being operated in a non compliant manner Consequently there would be no per mit in force for this equipment and the T...

Страница 91: ...OT contact the Telecom Faults Service The preferred method of dialing is to use DTMF tones as this is faster than pulse decadic dialing and is readily available on almost all New Zealand telephone exc...

Страница 92: ...Quick Reference Guide 84...

Страница 93: ...us Compatibility Modem ITU T V 34 AT T V 32terbo ITU T V 32bis V 32 Bell 212A and 103 113 ITU T V 22 V 22bis V 29 V 42 V 42bis V 21 V 23 in international ZDXI versions Compatibility Fax ITU T Group 3...

Страница 94: ...60 digits each and help menus Command Buffer 60 characters Modem Modulations FSK at 300 bps PSK at 1200 bps QAM at 2400 4800 and 9600 bps non trellis QAM with trellis coded modulation TCM at 9600 12K...

Страница 95: ...r 2225 Hz mark 2025 Hz space Receive answer 1270 Hz mark 1070 Hz space Fax Carrier V 21 Ch2 half duplex Frequencies 1650 Hz mark 1850 Hz space for transmit originate 1650 Hz mark 1850 Hz space for tra...

Страница 96: ...l loop Indicators LEDs for Transmit Data Receive Data Carrier Detect 28 8K bps 14 4K bps 9600 bps Off Hook Terminal Ready Error Correction Fax Speaker Command controlled speaker for call progress moni...

Страница 97: ...RANTY EXPRESSED OR IMPLIED AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED This warranty does not apply to any products that have been damaged...

Страница 98: ...repairs Please send modems that require repairs to the following address Multi Tech Systems Inc 2205 Woodale Drive Mounds View MN 55112 Attn Repair If you are shipping from outside the USA please con...

Страница 99: ...785 3702 interna tional and local The BBS can be accessed by any asynchronous modem operating at 1200 bps to 33 600 bps at a setting of 8 bits no parity and 1 stop bit 8 N 1 To Log on to the Multi Te...

Страница 100: ...PAGE DOWN key initiates the download 6 When the download is complete press ENTER to return to the File Menu 7 To exit the BBS type G and press ENTER If you don t know the file name 1 From the Main Men...

Страница 101: ...le will transfer automatically If you se lect another protocol you may have to initiate the transfer yourself In most data communications programs the PAGE DOWN key initiates the download 8 When the d...

Страница 102: ...the Technical Support catalog of documents For convenience write your fax number in the following space __________________________________________ From the Sales and Marketing catalog you can request...

Страница 103: ...MT2834ZDXb Data Rates...

Страница 104: ......

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