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DM562AP

Operation Manual & AT Command Set

Integrated Data/Fax/Voice/Speakerphone Modem

28                                                                                         

Preliminary

                                                                                                                                                                                    Version: DM562AP-MA-P01

                                                                                                                                                                   February 2, 2004

Chapter 4: Troubleshooting

Data communication involves many variables. Some
can be easy corrected, such as the settings in the
application software, the modem configuration. Some
are hard to correct, such as the local loop from the
central office to the modem line connection. If your
modem does not work properly, in most cases, the
problem is due to the incorrect settings,

This chapter explains some communications software
settings and describes troubleshooting procedures that
will help you isolate problems with the modem.

Software Settings

Since the modem is compatible with the Hayes "AT"
command set, almost all software applications can be
used with the modem. The configuration settings of the
modem and the protocol you use must be compatible
with those of the remote modem. Otherwise the
problems will arises in connection with the remote
modem or in transferring data.

Settings that commonly cause problems include the
parity, character length, stop bit setting and the minimal
speed settings. These must be the same settings with
the remote modem. Otherwise the data transferred will
not be readable or error.

In addition, the modem COM port address settings and
the IRQ settings, you enter in your application must be
correct, or the application software will e unable to
detect and communicate with the modem.

Troubleshooting Procedures

If you have problem using the modem, the
troubleshooting procedures described in this section
may be able to help you identify the source of the
problem.

Turn off and on of your system power and start the
application software.

•

  Is there a warning message from the application

software?

If there is warning message shown up, check the
COM address and IRQ settings of the application
software are the same as those for modem or not.

For Windows 95/98/2000 and XP, check the
modem property to make sure the modem COM
address and the IRQ.

For the DOS/ Linux, make sure the serial cable is
connected to COM1 or COM2.

•

  Why does application software is not perform what

you expect it to do?

Place computer in the terminal mode, and issue
"AT&FZ" carriage return twice. If OK is the
response, for the second time, your configuration
profile is not proper for the application software.
Consult the AT command section to change to the
applicable one.

•

  Why does modem transfer speed would not up to

56000 bit per second?

Please make sure your internet service provider
support V.90 dial up service, if yes, any noise on
line will decrease the connection speed.

How to determine modem is function properly or
not?

•

  The modem dials, but not transfer data

•

  Unusual characters appear on the screen.

•

  The receive message is partially lost.

•

  An abnormal disconnection occurs.

Start the terminal mode, select 115200 DTE speed,
type "AT&FZ", "AT&T1", let the modem go into local
test mode,  type several characters, determine
those characters is same as you typed or not. If it is,
your modem is good. If they are not what you typed,
power down the system and try again.

If characters is what you typed, you modem is
function good. To exit the local test mode, wait 1
second, type +++, wait another second, type
AT&T0, ATH, both should response with OK.

•

  Characters typed are not display.

•

  Characters typed are displayed twice.

Содержание DM562AP

Страница 1: ...Connectivity Beyond Limits DAVICOM Semiconductor Inc DM562AP Integrated Data Fax Voice Speakerphone Modem Operation Manual AT Command Set Preliminary Version DM562AP MA P01 February 2 2004 ...

Страница 2: ...ckage Checking the Installation Initialization String Set up Chapter 3 AT commands and S Registers Functional States Configuration Profiles AT Command Syntax AT Command set Part I Data command a General Command b V 42bis MNP 5 Command c Result Code Part II Fax Command a Fax V 17 Class 1 Command b Fax V 34 Class 1 Command c V 34 Fax Sample Session d V 34 Fax Half Duplex and T 30 Annex F Procedure s...

Страница 3: ...ble protection against such interference in a residential environment However there is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorienting th...

Страница 4: ...uld affect the proper operation of your equipment If such changes are planned you will be given advance notice so as to give you an opportunity to maintain uninterrupted service 5 If you experience trouble with this modem contact your dealer for repair warranty information The telephone company may ask you to disconnect this equipment from the network until the problem has been corrected or you ar...

Страница 5: ...ecording the message from remote telephone users As Speakerphone modem if hardware supports it provides the all functions as Voice modem above and with external speaker and microphone it provides user the hand free and conference speaker phone functions The Modem functions as a 56 000 bits per data modem a 14 400 bits per second fax modem with 115 200 bits per second data rate to and from your com...

Страница 6: ...ck marked as LINE jack on the bracket of the modem and the other end of phone cord to the phone jack in the wall If you wish you may connect a telephone set or your telephone devices to the modem so that both modem and your telephone devices are connected to a single wall jack To connect your telephone devices to modem simply plug the modular phone cord of your telephone devices into the PHONE jac...

Страница 7: ...ERMINAL and CONNECTION DESCRIPTION windows show up 14 Follow the prompt to make your first connection 8 b Windows 3 x or DOS Run the communication software provided with the modem Put the computer in terminal emulation mode so that the computer functions as a terminal To check whether your computer and modem are communicating properly either enter AT and carriage return The modem should respond by...

Страница 8: ...ignal is lost or intentionally dropped the connection the modem hangs up and re enters the command state While the modem is on line you can temporarily exit the on line state and enter the on line command state from which limit set of AT commands can be entered to interrogate the modem current settings and make sure the connection is what is supposed to be and to disconnect the line gracefully To ...

Страница 9: ... by entering AT F9 AT Command Syntax With two exceptions all AT commands are prefixed with AT uppercase or lowercase even odd none mark or space parity do not matter which stands for ATtention command body list in the following sections and command line terminator most commonly used is carriage return The two exceptions are the A command which is used to repeat the last command and the which cause...

Страница 10: ...switch from data mode to command mode you can pause one second and type Do not follow with carriage return The default ASCII character is decimal 43 You can change register S2 to any value from 0 to 255 Values greater than 127 disable the escape feature and prevent you from returning to the Command Mode Please refer to S2 and S12 Hn Hook control H0 Modem is on hook disconnect from line H1 Modem is...

Страница 11: ... remote modem data carrier signal Dn Data Terminal Ready DTR Signal Handling D0 Modem ignores the Data Terminal Ready signal from host D1 Modem returns to Command Mode and asynchronous operation following an ON to OFF Data Terminal Ready transition D2 Modem hangs up returns to the Command Mode and prepares for asynchronous operation following an ON to OFF Data Terminal Ready transition D3 Modem re...

Страница 12: ...333bps N25 Selects connect speed V 90 41333bps N26 Selects connect speed V 90 42666bps N27 Selects connect speed V 90 44000bps N28 Selects connect speed V 90 45333bps N29 Selects connect speed V 90 46666bps N30 Selects connect speed V 90 48000bps N31 Selects connect speed V 90 49333bps N32 Selects connect speed V 90 50666bps N33 Selects connect speed V 90 52000bps N34 Selects connect speed V 90 53...

Страница 13: ... Data Link Selection N0 Selects Normal data link N1 Selects Direct data link N2 Selects MNP Reliable link only N3 Selects MNP Auto reliable link N4 Selects V 42 reliable link with phase detection N5 Selects V 42 auto reliable link with phase detection N6 Selects V 42 reliable link without phase detection N7 Selects V 42 auto reliable link without phase detection Qn Flow Control Selection Q0 Disabl...

Страница 14: ...NECT 75TX 1200RX 26 x x x x RINGBACK 27 x x x x CONNECT BELL 300 28 x x x x CONNECT V21 29 x x x x Display DCE speed by ATW0 CONNECT 16800 15 x x x x CONNECT 19200 16 x x x x CONNECT 21600 17 x x x x CONNECT 24000 21 x x x x CONNECT 26400 30 x x x x CONNECT 28800 31 x x x x CONNECT 31200 32 x x x x CONNECT 33600 33 x x x x CONNECT 28000 34 x x x x CONNECT 29333 35 x x x x CONNECT 30666 36 x x x x ...

Страница 15: ...nds OK result code to the DTE FRS n This command causes the DCE to listen and to report back an OK result code when silence has been present on the line for the amount of time specified FTM n Transmit data using the modulation defined below An ERROR response code results if this command is issued while the modem is on hook FTM 24 V 27 ter 2400bps FTM 48 V 27 ter 4800bps FTM 72 V 29 ter 7200bps FTM...

Страница 16: ...esults if this command is issued while the modem is on hook FRH 3 V 21 channel 2 300bps FRH 24 V 27 ter 2400bps FRH 48 V 27 ter 4800bps FRH 72 V 29 ter 7200bps FRH 73 V 17 ter 7200bps long FRH 74 V 17 ter 7200bps short FRH 96 V 29 ter 9600bps FRH 97 V 17 ter 9600bps long FRH 98 V 17 ter 9600bps short FRH 121 V 17 ter 12000bps long FRH 122 V 17 ter 12000bps short FRH 145 V 17 ter 14400bps long FRH ...

Страница 17: ...efined for maxp the default value 0 selects the minimum rate supported by the DCE 2400 bit s in Recommendation V 34 prefc is the preferred rate that the DCE may use for the control channel receive rate in units of 1200 bit s Valid prefc values are 1 1200 bit s and 2 2400 bit s and 0 no preference specified The default value is 0 Transparent data commands DLE DLE 10H substitute one 10h pattern DLE ...

Страница 18: ... reduced CC rate PPS MPS DLE ETX send PPS MPS get PPS MPS MCF DLE ETX get MCF send MCF DCN DLE ETX send DCN get DCN DLE EOT OK terminate V 34 channel detect V 34 channel termination ATH OK hang up Answer and receive a 2 page facsimile with V 34 half duplex DTE commands and data DCE indications and data DCE actions Remote terminal actions Notes AT FCLASS 1 0 OK select Class 1 ATS0 1 OK Auto Answer ...

Страница 19: ...AP Operation Manual AT Command Set Integrated Data Fax Voice Speakerphone Modem Preliminary 19 Version DM562AP MA P01 February 2 2004 ATH Hang up V 34 Half Duplex and T 30 Annex F Procedures service Class 1 ...

Страница 20: ...a RxD State Host Commands and data TxD Modem Indications and data RxD T 31 T 31 S1 AT A8E 3 OK R1 AT A8E 2 OK AT FCLASS 1 0 OK AT FCLASS 1 0 OK AT F34 14 4 2 OK AT F34 10 OK ATDT Phone Num A8A 1 RING 1 sec delay ATA A8M 8185D490 OK OK A8M 8185D490 A8J 1 OK F34 10 1 A8J 1 T 31 F34 14 2 R2 CONNECT T 31 DLE ctrl CONNECT DLE P224 S2 DLE ctrl DLE C12 DLE p336 T 30 DLE C24 R3 NSF DLE ETX T 30 CSI DLE ET...

Страница 21: ...mes S5 FCD frames T 31 RCP flames R6 DLE ctrl T 31 DLE p216 S6 DLE ctrl DLE ctrl DLE C12 DLE p240 T 30 DLE C24 R7 PPS MPS DLE ETX T 30 MCF DLE ETX S7 PPS MPS DLE ETX T 31 MCF DLE ETX R8 DLE pri T 31 DLE p216 DLE pri DLE pri T 30 S8 DLE p240 R9 FCD frames T 30 RCP flames S9 FCD frames T 31 RCP frames R10 DLE ctrl T 31 DLE P216 DLE ctrl DLE c12 S10 DLE p240 T 30 DLE c12 R11 PPS EOP DLE ctrl DLE ETX ...

Страница 22: ... 3 12db TL 4 6db TL 5 0db TL 6 6db TL 7 12db TL 8 18db high volume VBQ Query Buffer Size Response 20 VBS Bits Per Sample Selection VBS Returns the current setting of VBS VBS 1 Selects 8 bits PCM VBS 2 Selects 2 bits per sample ADPCM VBS 3 Selects 3 bits per sample ADPCM VBS 4 Selects 4 bits per sample ADPCM VBS 8 Selects 8 bits per sample ADPCM VBT Beep Tone Timer VBT Returns the current setting o...

Страница 23: ...cuted successfully ERROR Command error and can not be executed VCON Issued in Voice mode CLS 8 when the modem determines that the remote modem or handset has gone off hook or when returning to on line voice command mode NO ANSWER Issued in Voice mode CLS 8 when the modem determines that the remote modem has not picked up the line after the S7 timer has expired CONNECT When Voice transmission by DT...

Страница 24: ... You can change it to any ASCII value between 0 and 32 or 127 Note Do not set the value of the backspace character between 33 and 126 Register S6 Dial Tone Wait Time Register S6 sets the time to wait after going off hook before dialing the first digit in a Dial command when using the X0 X1 or X3 responses The default time is 2 seconds although you can change it to any value between 2 and 255 secon...

Страница 25: ...ime delay required before and after you enter the escape characters The guard time prevents your modem from misinterpreting data as the escape sequecce This value is designated in measurements of 20 ms The default value is 50 which is equivalent to one second although you can change it to between 0 0 seconds to 255 5 1 seconds Register S14 Bit mapped Register Bit mapped register S14 lets you contr...

Страница 26: ...mapped Register Bit Function 1 2 3 0 Use 0 300bps DTE data rate 2 Use 1200bps DTE data rate 3 Use 2400bps DTE data rate 4 Use 4800bps DTE data rate 5 Use 9600bps DTE data rate 6 Use 19200bps DTE data rate 7 Use 38400bps or above DTE data rate 4 5 0 Use even parity 1 Use space parity 2 Use odd parity 3 Use mark or none parity 6 7 0 Turn off guard tone G0 default 1 Turn off guard tone G1 2 Use 1800 ...

Страница 27: ... Reserved 7 Modem tries to connect using V 42 Alternative Protocol compatible with MNP levels 2 5 If handshaking fails modem tries to connect using a standard asynchronous connection and automatic speed buffering default Register S46 Protocol selection Register S46 defines the protocol selections specified for future negotiation Value Function 136 LAP M only 138 LAP M with adaptive data compressio...

Страница 28: ...section may be able to help you identify the source of the problem Turn off and on of your system power and start the application software Is there a warning message from the application software If there is warning message shown up check the COM address and IRQ settings of the application software are the same as those for modem or not For Windows 95 98 2000 and XP check the modem property to mak...

Страница 29: ...t the receiver If there is no tone the line connection is need to be checked If there is a tone but not normal dial tone turn system off and on and try again The modem dials but not connect Type AT FZ and re dial the number if there are no modem negotiation sound from the modem the remote side is not a modem Try AT FCLASS 0 and AT CLS 0 to put modem back to data mode If you go through the possible...

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