Home

VOICE/FAX/DATA MODEM USER'S MANUAL

1. Range 2 255 seconds S7 Wait for Carrier after Dial S7 controls how long the modem waits for a carrier signal from a remote modem after originating a call or from the calling modem after going off hook when answering a call S7 also controls how long the modem waits for a one second continuous dialtone after dialing a number followed by the W dial modifier If the modem detects a one second continuous dialtone within the specified wait time it proceeds to dial Range 1 255 seconds S8 Pause Time for Comma mom S8 controls how long the modem pauses when a comma is encountered in a dial string while executing a dial command Range 0 255 seconds s9 Carrier Detect Response Time S9 determines how long a carrier signal must be present for the modem to confirm it The longer the response time the easier it is for the modem to correctly recognize a carrier without mistaking other signals or transient noise on the line as a carrier Range 1 255 tenths of a second S10 Delay between Loss of Carrier and Hang Up S10 determines the delay time between the loss of a carrier from the remote modem and hang up This allows for a temporary loss of carrier without causing the local modem to disconnect When S10 is set to 255 the modem functions as if a carrier is always present The actual interval the modem waits before disconnecting is the value in S10 minus the value in S9 Therefore the value in S10 must be greater t
2. 300 56000 0 1 0 1 Subparameter Definitions 1 lt mod gt A decimal number which specifies the preferred modulation automode enabled or modulation automode enabled to use in originating or answering a connection The options are lt mod gt Modulation Possible Rates bps Notes 0o V 21 300 1 V 22 1200 2 V 22 bis 2400 or 1200 3 V23 1200 See Note 2 9 V 32 9600 or 4800 10 V 32 bis 14400 12000 9600 7200 or 4800 11 V 34 33600 31200 28800 26400 24000 21600 19200 16800 14400 12000 9600 7200 4800 or 2400 12 V 90 56000 54677 53333 52000 50669 49333 48000 46667 45333 42667 41333 40000 38667 37333 36000 34667 33333 32000 30667 29333 28000 56 K56flex 56000 54000 52000 50000 48000 46000 44000 42000 40000 38000 36000 34000 32000 64 Bell 103 300 69 Bell 212 1200 Notes 1 See optional lt automode gt lt min_rate gt and lt max_rate gt subparameters 2 For V 23 originating modes transmit at 75 bps and receive at 1200 bps answering modes transmit at 1200 bps and receive at 75 bps The rate is always specified as 1200 bps The modem may also automatically switch to another modulation automode subject to the following constraints The modem may not be able to automatically switch from the current modulation specified by lt mod gt to some other modulation For example there is no standard way to automode from Bell 103 to V 23 The DTE may disable automode operation see
3. ATS18 608 amp T1 lt CR gt Result CONNECT 56000 Test message THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG 1234567890 Escape Result code OK 4 2 Local Analog Loopback with Self Test The local analog loopback with self test checks the integrity of the local modem In this test an internally generated data pattern of alternate binary ones and zeros reversals at the selected bit rate is looped through the internal analog loop inside the local modem to an internal error counter as shown in Figure 4 2 An error count of 255 indicates that 255 or more errors were detected Example the test timer is disabled and 12 errors are found during the test Local Modem PC Analog Loop Telephone Line Error Counter Receiver Fig 4 2 Local Analog Loopback with Self test Command AT amp Q0 lt CR gt ATS18 0 amp T8 lt CR gt Result OK Command AT amp T0 lt CR gt ends the test Test result 000 Result code OK 5 THROUBLESHOOTING GUIDE This chapter describes common problems in the installation configuration and regular usage of your Fax Data Modem To test the Fax Data Modem a communication software package is needed and the package must include a mode that allows you to operate your Fax Data Modem by directly issuing internal commands to the modem Follow the procedures in the following sections to resolve these common problems No Response From Your Modem 1 If you are using the internal add on card modems make s
4. Determines whether the modem sends the result codes to the DTE Qo Allows the modem to send result codes to the DTE Q1 Prohibits the modem from sending result codes to the DTE Sn Reading and Writing to S Registers Sn Reads S Registers Read the contents of the S register specified by n Sn x Writing to Registers Writes the value of x to the specified S register All the registers will return the OK response if x is a legal value However some registers will not actually write the value these are S1 13 S15 S20 S24 and S27 n 0 95 x 0 255 T Set Tone Dial as Default Causes the modem to assume that all subsequent dial commands are tone dial Vn Select Word or Digit Result Codes Vo V Displays result codes in digital format v1 Displays result codes in verbose format Default Wn Connect Message Control This command controls the format of CONNECT messages The parameter value if valid is written to S31 bits 2 and 3 Note that the Wn command can be overridden by register S95 bits see S95 description wo Upon connection the modem reports only the DTE speed e g CONNECT 19200 Subsequent responses are disabled Default w1 Upon connection the modem reports the line speed the error correction protocol and the DTE speed respectively Subsequent responses are disabled W2 Upon connection the modem reports the DCE speed e g CONNECT 14400 Subsequent responses are disabled Xn Extended Result Codes
5. Profile A list of default settings Protocol A technical specification for serial communications the protocols supported by the modem are listed in Appendix B PSK Phase Shift Keying Pulse Dialing A dialing form in which each digit is represented by a series of pulses Rotary telephones all use pulse dialing QAM Quadrature Amplitude Modulation Result Codes The response the modem returns to the screen upon executing a command RAM Random Access Memory ROM Read Only Memory A chip inside the modem which stores the factory default settings This memory cannot be changed RTS Request To Send RX Reception S Register RAM locations in the modem which store the active configuration Serial Port See COMx TCM Trellis Coded Modulation Touchtone Dialing A dialing format in which each digit is represented by a musical frequency TX Transmission F ASCII CODE TABLE Decimal Hex Value Decimal Hex Value Decimal Hex Value Decimal Hex Value 000 00 NUL 032 20 space 064 40 096 60 001 01 SOH 033 21 065 41 A 097 61 a 002 02 STX 034 22 066 42 B 098 62 b 003 03 ETX 035 23 067 43 C 099 63 c 004 04 EOT 036 24 068 44 D 100 64 d 005 05 ENQ 037 25 069 45 E 101 65 e 006 06 ACK 038 26 amp 070 46 F 102 66 f 007 07 BEL 039 27 071 47 G 103 67 g 008 08 BS 040 28 072 48 H 104 68 h 009 09 HT 041 29 073 49 105 69 i 010 OA LF 042 2A 074 4A J 106 6A j 011 0B VT 043 2B 075 4B K 107 6B k
6. E3 Enable line quality monitor and auto retrain but hang up immediately when EQM reaches hang up threshold fast hang up L Report Received Signal Level Returns a value identifying the received signal level The possible values are 009 9 dBm 010 10 dBm 011 11 dBm 043 43 dBm Q Line Signal Quality Reports the line signal quality DAA dependent Returns the higher order byte of the EQM value Based on the EQM value retain or fallback fall forward may be initiated if enabled by E1 or E2 Un Select _Law or A_Law Codec Type This command selects u_Law or A_Law codec type for V 90 and K56 flex modulation similar to the lt x_law gt parameter in the MS command see MS command This command overrides the lt x_law gt setting specified in a previous MS command and the lt x_law gt parameter in a MS command overrides a previous Un command This command also stores the selected setting directly to NVRAM U0 Selects u_Law U1 Selects A_Law Result codes OK n Oor1 ERROR Otherwise 2 2 4 Commands Preceded by MS Select Modulation This extended format command selects the modulation and optionally enables or disables automode specifies the lowest and highest connection rates selects u Low or A Low codec type and enables or disables robbed bit signaling generation server modem or detection client modem using one to five subparameters The command format is MS lt mod gt L lt automode gt
7. S36 7 07h LAPM Failure Control S37 0 00h Desired Line Connection Speed S38 0 255 seconds 20 14h Delay before Forced Disconnect S39 3 03h Flow Control S40 Bit Mapped Options 104 68h General Bit Mapped Options 41 3 03h Bit Mapped Options S46 138 8Ah Protocol Selection 48 7 07h V 42 Negotiation Action S82 128 80h Break Handling Option S86 0 255 Call Failure Reason Code S91 0 15 dBm 10 OAh PSTN Transmit Attenuation Level S92 0 15 dBm 10 OAh Fax Transmit Attenuation Level 95 Bit mapped 0 00h Extended result codes Fig 3 1 S Register Summary 3 2 Glossary of S Registers so Number of Rings Before Auto Answer SO determines the number of rings that must be received before the modem automatically answers an incoming call For example when S0 3 the modem automatically answers after the third ring When S0 0 the modem does not automatically answer an incoming call it stays on hook until the A command is issued manually to answer the incoming call Range 0 255 rings S1 Ring Count S1 automatically increments its value by one each time the modem receives a ring while in the command state S1 is reset to zero if no ring is detected within 8 seconds Range 0 255 rings S2 ASCII Value of Escape Character S2 stores the ASCII value of the escape character Setting register S2 to a value greater than 127 disables the escape command and you cannot return to the command state With escape disabled in the on line s
8. TAG Description DATE DATE MMDD where MM is the month number 01 to 12 and DD is the day number 01 31 TIME TIME HHMM where HH is the hour number 00 to 23 and MM is the minute number 00 to 59 NMBR NMBR lt number gt or P or O where lt numbers gt is the telephone number of the caller where P indicates that the calling number information is not available since the originating caller has requested private service and where O indicates that the calling number information is not available or out of service at the calling location NAME NAME lt listing name gt where lt listing name gt is the subscription name MESG MESG lt data tag gt lt length of message gt lt data gt lt checksums gt in printable ASII hex numbers This tag indicates a data item not listed above The message is only possible for Multiple Message Format Notes 1 The modem does not present any Caller ID information if the DCE detects a checksum error in the Caller ID packet 2 In the event of an unrecognized data tag the modem will present the data in ASCII hex numbers following the MESG tag Example of Formatted Form Reporting 1 The following example illustrates the standard Caller ID message packet RING DATE 0321 TIME 1405 NMBR 504551234 NAME A N OTHER RING RING 2 The following example illustrates the case where the tag of the packet is not recognized by the modem RING MESG 06034242431 RING RING Unformatte
9. This command selects which subset of the result messages will be used by the modem to inform the DTE of the results of commands Blind dialing is enabled or disabled by country parameters If the user wishes to enforce dial tone detection a W can be placed in the dial string see D command Note that the information below is based upon the default implementation of the X results table If the modem is in facsimile mode FCLASS 1 or 2 the only message sent to indicate a connection is CONNECT without a speed indication X0 Disables monitoring of busy tones unless forced otherwise by country requirements send only OK CONNECT RING NO CARRIER ERROR and NO ANSWER result codes Blind dialing is enabled disabled by country parameters If busy tone detection is enforced and busy tone is detected NO CARRIER will be reported If dial tone detection is enforced or selected and dial tone is not detected NO CARRIER will be reported instead of NO DIAL TONE The value 000b is written to S22 bits 6 5 and 4 respectively X1 Disables monitoring of busy tones unless forced otherwise by country requirements send only OK CONNECT RING NO CARRIER ERROR NO ANSWER and CONNECT XXXX XXXX rate Blind dialing is enabled disabled by country parameters If busy tone detection is enforced and busy tone is detected NO CARRIER will be reported instead of BUSY If dial tone detection is enforced or selected and dial tone is not elected NO CARRIER will be
10. lt automode gt below The DTE may constrain the range of modulations available by specifying the lowest and highest rates see lt min_rate gt and lt max_rate gt below 2 lt automode gt is an optional numeric value which enables or disables automatic modulation negotiation using V 8 bis V 8 or V 32 bis Annex A The options are lt automode gt Option Selected Notes 0 Automode disabled 1 Automode enabled using V 8 bis V 8 or V 32 default Annex A The default value is 1 which enablesautomode Note however there are modulations for which there is no automode negotiation e g Bell 212 lt mod gt 69 For lt automode gt 0 automode disabled i e fixed modulation If lt max_rate gt is within the rates supported by the selected modulation the selected rated is that specified by lt max_rate gt For example MS 10 0 1200 4800 selects V 32 bis 4800 bps fixed rate If lt max_rate gt is greater than the highest speed supported by the modulation specified by lt mod gt the starting rate is the highest rate supported by the selected modulation For example MS 10 0 2400 14400 selects V 32 bis 14400 12000 9600 7200 or 4800 bps To emulate issuance of the NOS37 x command sequence to select fixed mode operation specify the lt max_rate gt and lt min_rate gt both to be the same requested speed and lt mod gt to be the modulation for that speed For example MS 11 0 16800 16800 selects V 34 168
11. lt min_rate gt lt max_rate gt lt x_law gt lt rb_signaling gt lt CR gt Notes 1 For 14400 bps and lower speeds the Nn command and S37 register can alternatively be used in which case the MS subparameters will modified to reflect the Nn and S37 x settings Use of the Nn and S37 x commands is not recommended but is provided for compatibility with existing communication software S37 is not updated by the MS command 2 Subparameters not entered enter a comma only or lt CR gt to skip the last subparameter remain at their current values Reporting Selected Options The modem can send a string of onformation to the DTE consisting of selected options using the following command MS The response is MS lt mod gt lt automode gt lt min_rate gt lt max_rate gt lt x_law gt lt rb_signaling gt For example K56flex MS 56 1 300 56000 0 0 V 90 MS 12 1 300 56000 0 0 33600 RC56 default values Reporting Supported Options The modem can send a string of information to the DTE consisting of supported options using the following command MS The response is MS list of supported lt mod gt values list of supported lt automode gt values list of supported lt min_rate gt values list of supported lt max_rate gt values list of supported lt x_law gt values list of supported lt rb_signaling gt values For example MS 0 1 2 3 9 10 11 12 56 64 69 0 1 300 33600
12. pass through Mode Same as amp Q0 N2 Selects Reliable Link Mode N3 Selects Auto reliable Mode Modem attempts to connect with error correction N4 Select LAPM error correction mode N5 Select MNP error correction mode Vn Single Line Connect Message Enable The single line connect message format can be enabled or disabled by the Vn command as follows vo Connect messages are controlled by the command settings X W and S95 V1 Connect messages are displayed in the single line format described below subject to the command settings V Verbose and Q Quiet In Non Verbose mode V0 single line connect messages are disabled and a single numeric result code is generated for CONNECT DTE When single line connect messages are enabled there are no CARRIER PROTOCOL or COMPRESSION messages apart from the fields described below The single line connect message format is CONNECT lt DTE Speed gt lt Modulation gt lt Protocol gt lt Compression gt lt Line Speed gt lt Voice and Data gt Where lt DTE Speed DTE speed e g 57600 Modulation V32 for V 32 or V 32bis modulations V34 for V 34 modulations Note Modulation is omitted for all other modulations Protocol NONE for no protocol ALT for Microcom Network Protocol LAPM for LAP M protocol Compression CLASS5 for Microcom MNP5 compression V42BIS for V 42bis compression Note Compression is omitted if protocol is NONE Line Speed Asymmetric rate
13. CONNECT 52000 175 Connection established at 52000 bps CONNECT 54000 176 Connection established at 54000 bps CONNECT 56000 177 Connection established at 56000 bps FCERROR F4 V 90 Result Codes Speed Carrier Connect 28000 180 180 29333 181 181 30667 182 182 32000 150 165 33333 183 183 34667 184 184 36000 152 167 37333 185 185 38667 186 186 40000 154 169 41333 187 187 42337 188 171 45333 189 189 46667 190 190 48000 158 173 49333 191 191 50667 192 192 52000 160 175 53333 193 193 54667 194 194 56000 162 177 3 S REGISTERS REFERENCE Your modem has status registers These registers are memory locations inside your modem which control your modem s operation You usually do not have to worry about setting any register because the default values work for most applications The S registers are summarized in Fig 3 1 along with their default values Registers denoted with an may be stored in one of the two user profiles by entering the amp Wn command One of these profiles may be loaded at any time by using the Zn command The factory default values are stored in ROM and are loaded into the active configuration at power up or by the Zn command In addition the designated default profile is subsequently loaded and may change some of the factory default values The designated default profile can be changed by entering the amp Yn command where n is one of the two possible user profiles The factory defaults can be loaded a
14. Dialing Dial a Stored Number Touchtone Dialing Wait for Dialtone gt A 0 U Repeat Command Escape E GLOSSARY ASCII An acronym for American Standard Code for Information Exchange ASCII is a seven bit code which defines 128 standard characters including control characters letters numbers and symbols An extra 128 characters comprise the extended ASCII set Baud Rate The transmission rate between two serial devices e g modems fax machines etc Measured in Bits Per Second Blind Dialing In blind dialing the modem continues to dial regardless of the existence of a dialtone ring or busy signal BPS Bits Per Second the number of bits that can be transmitted in one second Carrier Signal The analog data signal that a modem sends over telephphone wires COMX Where x 1 2 3 or 4 COMx is the name address of serial communications ports on personal computers Each serial port in a personal computer has a different number CTS Clear To Send Default The assumed value that is used for a command parameter when no other value is explicitly provided DCD Data Carrier Detect DCE Data Communication Equipment DTE Data Terminal Equipment DTMF Dual Tone Multifrequency for touchtone dialing DTR Data Terminal Ready FSK Frequency Shift Keying Make Break Ratio The ratio of the off hook make to on hook break interval is the make break ratio in pulse dialing Modem A
15. combination of the words MOdulator and DEModulator Modems transform digital data into analog signals and back again Nonvolatile Memory An area of memory inside the modem where the default configuration profile is stored Values recorded in this memory will not be lost when the power is turned off Off Hook The condition when the modem has picked up the telephone line Off Line Command State A modem state in which the modem accepts interprets and executes commands from an asynchronous computer or terminal On Hook The condition when the modem has not picked up the telephone line the telephone is hung up On Line A carrier signal link with a remote modem has been established communication is in progress On Line State A modem state in which the modem is connected with a remote modem Data can be sent or received from the remote modem in this state No commands will be accepted from the modem except the escape command which will bring the modem into the on line command state On Line Command State A modem state in which the modem can accept or execute commands from an asynchronous computer or terminal while remaining connected with the remote modem The user can return the modem to the on line state by issuing the ATOn command or put it into the off line command state by issuing command such as ATZ or ATH Parity An error checking method by which the modem verifies that the data just sent is correct pps Pulse per second
16. has been detected on the line CARRIER 9600 50 When the 9600 bps data rate in V 32 bis or V 32 mode has been detected on the line CARRIER 12000 51 When the 12000 bps data rate in V 32 bis mode has been detected on the line CARRIER 14400 52 When the 14400 bps data rate in V 32 bis mode has been detected on the line CARRIER 16800 53 When the 16800 bps data rate in V 34 mode has been detected on the line CARRIER 19200 54 When the 19200 bps data rate in V 34 mode has been detected on the line CARRIER 21600 55 When the 21600 bps data rate in V 34 mode has been detected on the line CARRIER 24000 56 When the 24000 bps data rate in V 34 mode has been detected on the line CARRIER 26400 57 When the 26400 bps data rate in V 34 mode has been detected on the line CARRIER 28800 58 When the 28800 bps data rate in V 34 mode has been detected on the line CONNECT 16800 59 Connection established at 16800 bps CONNECT 21600 61 Connection established at 21600 bps CONNECT 24000 62 Connection established at 24000 bps CONNECT 26400 63 Connection established at 26400 bps CONNECT 28800 64 Connection established at 28800 bps COMPRESSION CLASS 5 66 MNP class 5 compression in use COMPRESSION V 42BIS 67 V 42 bis compression in use COMPRESSION NONE 69 No compression is being used PROTOCOL NONE 76 Normal mode selected PROTOCOL LAPM 77 LAPM mode selected CARRIER 31200 78 When the 31200 bps data rate in V 34 mode has been detected on the line CARRIER 33600 79 When
17. loads stored configuration 1 2 2 a Commands Preceded by amp amp Cn Select DCD Options amp C0 amp C Maintains an ON status for the Data Carrier Detect DCD amp C1 Uses the actual state of the carrier from the remote modem for DCD Default amp Dn DTR Option Determines actions taken by the modem in relation to the Data Terminal Ready DTR signal of the serial port amp DO DTR is ignored Allows operation with DTEs that do not provide DTR amp D1 DTR drop is interpreted by the modem as if the escape sequence has been entered The modem returns to the command state without disconnecting amp D2 DTR drop causes the modem to hang up Auto answer is inhibited Default amp D3 DTR drop causes the modem to perform a soft reset as if the Z command were received amp F Fetch Factory Configuration amp FO amp F1 Recall factory profile 0 Default Recall factory profile 1 amp Gn Set Guard Tone amp GO G1 amp G2 Disable guard tone Default Select 1800Hz guard tone amp Kn DTE Modem Flow Control Determines how the modem controls the flow of data between the local DTE and the modem When the modem terminal buffer is nearly full the modem will either send an XOFF or drop CTS to stop the data flow When the buffer is nearly empty the modem will either send an XON or raise CTS to start the data flow amp KO amp K3 amp K4 amp K5 Disable DTE DCE flow control Enable RTS CTS D
18. reported instead of NO DIAL TONE The value 100b is written to S22 bits 6 5 and 4 respectively X2 Disables monitoring of busy tones unless forced otherwise by country requirements send only OK CONNECT RING NO CARRIER ERROR NO DIAL TONE NO ANSWER and CONNECT XXXX If busy tone detection is enforced and busy tone is detected NO CARRIER will be reported instead of BUSY If dial tone detection is enforced or selected and dial tone is not detected NO DIAL TONE will be reported instead of NO CARRIER The value 101b is written to S22 bits 6 5 and 4 respectively X3 Enables monitoring of busy tones send only OK CONNECT RING NO CARRIER ERROR NO ANSWER and CONNECT XXXX Blind dialing is enabled disabled by country parameters If dial tone detection is enforced and dial tone is not detected NO CARRIER will be reported The value 110b is written to S22 bits 6 5 and 4 respectively X4 Enables monitoring of busy tones send all messages The value 111b is written to S22 bits 6 5 and 4 respectively Default Yn Enables or Disables Long Space Disconnect YO Y Disables Long Space Disconnect Default Y1 Enables Long Space Disconnect Zn Reset Zn which must be placed at the end of the command line resets the active configuration of the modem to the stored configuration saved in nonvolatile RAM hangs up the modem and clears the command buffer Z0 Z Resets the modem and loads stored configuration 0 Z1 Resets the modem and
19. your phone and begin data communication with the remote modem A MNP 10 COMMANDS A 1 MNP 10 COMMANDS AT Commands Mn Enable Cellular Power Level Adjustment Enables or disables automatic adjustment of the transmit power level during link negotiation for reliable links to accommodate the signaling requirements of cellular telephone equipment The parameter value if valid is written to S40 bit 2 Note that the Mn command sets the initial transmit level Mo Disables power level adjustment during MNP 10 link negotiation default M1 Enables power level adjustment during MNP 10 link negotiation Result Codes OK n Oor1 ERROR Otherwise AT Commands Hn Link Negotiation Speed This command controls the connection speed for link negotiations before upshift occurs between two MNP Class 10 modems The parameter value if valid is written to S28 bits 6 and 7 HO Link negotiation occurs at the highest supported speed default H1 Link negotiation occurs at 1200 bps H2 Link negotiation occurs at 4800 bps Result Codes OK n 0to2 ERROR Otherwise Kn MNP Extended Services Enables or disables conversion of a V 42 LAPM connection to an MNP 10 connection The parameter value if valid is written to S40 bit 0 1 KO Disables V 42 LAPM to MNP 10 conversion K1 Enables V 42 LAPM to MNP 10 conversion default K2 Enables V 42 LAPM to MNP 10 conversion inhibits MNP Extended Services initiation during V 42 LAPM answ
20. 0 to 15 dBm transmit level 92 Fax Transmit Attenuation Level Sets the transmit attenuation level from 0 to 15 dBm for the fax mode resulting in a transmit level from 0 to 15 dBm Range 0 to 15 dBm Corresponding to 0 to 15 dBm transmit level S95 Extended Result Codes This register can override some of the W command options Set the appropriate bit to 1 to enable the corresponding result code regardless of the W command setting Set the bit to 0 to disable the result code Description CONNECT indicates DCE speed Append ARQ to the CONNECT result code if the protocol is other than NONE CARRIER result code PROTOCOL result code Reserved COMPRESSION result code Reserved Reserved NOoORWDN OW 4 TESTING The modem provides five testing features to identify fault location when transmission quality is not good local digital loopback local analog loop back local analog loopback with self test remote digital loopback and remote digital loopback with self test These tests are initiated with the amp Tn command described in Chapter 2 4 1 Local Analog Loopback The local analog loopback test checks the integrity of the local computer or terminal and the local modem During the test the local modem internally loops data sent from the local computer or terminal back to the same computer or terminal as shown in Figure 4 1 During the test data is not transmitted to the remote modem If characters are loop
21. 00 bps fixed mode no comparable S37 command MS 10 0 12000 12000 selects V 32 bis 12000 bps fixed mode same as NOS37 10 For lt automode gt 1 automode enabled i e automatically selected speed and modulation The modem connects at the highest possible rate in accordance with V 8 bis V 8 or V 32 bis Annex A if V 8 bis V 8 is not supported by the remote modem a If lt max_rate gt is greater than the highest rate supported by the modulation specified by lt mod gt the modem automodes down from the highest rate of the selected modulation For example MS 10 1 1200 24000 selects automoding down from V 32 bis 14400 bps To emulate issuance of the N1S37 x sequence command specify the modulation and the rate to start automoding down from using lt mod gt and lt max_rate gt respectively Set lt min_rate gt to 300 to allow automoding all the way to V 21 300 bps For example MS 11 1 300 16800 selects automodestarting at V 34 16800 bps no comparable S37 command MS 9 1 300 12000 selects automode starting at V 32 bis 12000 bps same as N1S37 10 3 lt min_rate gt is an optional number specifies the lowest rate at which the modem may establish a connection The value is decimal coded in units of bps e g 2400 specifies the lowest rate to be 2400 bps The default is 300 for 300 bps 4 lt max_rate gt is an optional number specifies the highest rate at which the modem may establish a connection The va
22. 012 0C FF 044 2C 076 4C L 108 6C 013 0D CR 045 2D 077 4DM 109 6D m 014 0E SO 046 2E 078 4E N 110 6E n 015 OF SI 047 2F 079 F O 111 6F o 016 10 DLE 048 30 0 080 50 P 112 70 p 017 11 DC1 049 31 1 081 5 Q 113 71 q 018 12 DC2 050 32 2 082 52 R 114 72 r 019 13 DC3 051 33 3 083 53 S 115 73 s 020 14 DC4 052 34 4 084 54 T 116 74 t 021 15 NAK 053 35 5 085 55 U 117 75 u 022 16 SYN 054 36 6 086 56 V 1148 76 v 023 17 ETB 055 37 7 087 57 W 119 77 w 024 18 CAN 056 38 8 088 58 X 120 78 x 025 19 EM 057 39 9 089 59 Y 1x 79 y 026 1A SUB 058 3A 090 5A Z 122 7A z 027 1B ESC 059 3B 091 5B 123 7B 028 1C FS 060 3C lt 092 5C 124 7C 029 1D GS 061 3D 093 5D 125 7D 030 1E RS 062 3E gt 094 5E 126 7E 031 1F US 063 3F 095 5F 127 7F DEL
23. 33 67 make break ratio at 20 pulse per second amp P3 bit 5 Reserved bit 6 7 MNP Link Negotiation Speed Hn 0 Link negotiation at highest speed HO 1 Link negotiation at highest speed H1 2 Link negotiation at highest speed H2 29 Flash Dial Modifier Time Range 0 255 10ms intervals 30 Inactivity Disconnect Timer This register determines the length of time in seconds the modem waits before disconnecting when no data is sent or received This only operates in amp Q5 and amp Q6 modes a value of 0 in this register disables the timer Range 0 255 tenths of a second 31 Bit Mapped Options Bit Value Description bit 1 Controls auto line speed detection Nn 0 Disable NO i Enable N1 bit 2 3 Controls error correction progress messages Wn 00 DTE speed only W0 01 Full reporting W1 10 DCE speed only W2 32 XON Character Range 0 255 ASCII decimal S33 XOFF Character Range 0 255 ASCII decimal S36 LAPM Failure Control This register is read when the S48 register contains the value 128 or if an attempted error correction link fails These fallback options are initiated immediately upon connection if S48 128 Bit bit 0 1 2 001 established 011 100 101 110 Value Action 000 Modem disconnect Modem stays on line and Direct mode connections 010 Reserved Modem stays on line and a Normal mode connection is established An MNP connection is attempted an
24. 5 the modem waits indefinitely for the remote modem to acknowledge all data Range S39 Flow Control Bit Value bit 0 2 000 011 100 0 255 seconds Connect speed No flow control RTS CTS amp K3 XON XOFF amp K4 101 Transparent XON amp K5 110 Both Method amp K6 bit3 7 Reserved S40 General Bit Mapped Options Bit Value Description bit 0 1 MNP Extended Services Kn 0 Disable extended services K0 Default for non MNP 10 models 1 Enable extended services K1 Default for MNP 10 models 2 Enable extended services K2 bit 2 Power level Adjustment for Cellular Use Mn Auto adjustment MO Force adjustment M1 bit 3 5 Break handling Kn KO K1 K2 K3 K4 K5 bit 6 7 MNP block size An 64 chars A0 128 chars A1 192 chars A2 256 chars A3 arkWNnM Oo O won o 41 Bit Mapped Options Bit Value Description bit 0 1 Compress selection Cn 00 Disable CO 01 MNP 5 C1 10 V 42 bis C2 1 MNP 5 and V 42 bis C3 bit 6 2 Auto retrain En 00 Retrain disable E0 01 Retrain enable E1 10 Fallback fall forward enable E2 bit 3 Modem to modem flow control G 0 Disable G 1 Enable G1 bit 4 Block mode control Ln 0 Store mode LO 1 Block mode L1 bit 5 Reserved bit 7 Enable fallback to V 22bis V 22 Qn 0 Disable Q0 1 Enable Q1 S46 Protocol Selection This register controls whether the modem tries to use data co
25. Store one of four dial strings including a telephone number of up to 45 digits in nonvolatile RAM For example to store the telephone number 002852117 to RAM location 1 issue the following command Command AT amp Z1 002852117 lt CR gt 2 2 6 Commands Preceded by An Select Maximum MNP Block Size The modem will operate an MNP error corrected link using a maximum block size controlled by the parameter supplied The parameter value if valid is written to S40 bits 6 and 7 AO 64 characters A1 128 characters Default A2 192 characters A3 256 characters Result Codes OK n 0 to 3 ERROR Otherwise Bn Transmit Break to Remote In non error correction mode the modem will transmit a break signal to the remote modem with a length in multiples of 100ms according to parameter specified If a number in excess of 9 is entered 9 is used The command works in conjunction with the K command In error correction mode the modem will signal a break through the active error correction protocol giving no indication of the length B1 B9 Break length in 100ms units Default 3 Non error corrected mode only Result Codes OK If connected in data modem mode NO CARRIER If not connected or connected in fax modem mode Note When the modem receives a break from the remote modem break is passed to the DTE as follows In non error correction mode direct the break length is passed in non error correction mode normal and in erro
26. TE DCE flow control Default Enables XON XOFF DTE DCE flow control Enables transparent XON XOFF DTE DCE flow control Enable RTS CTS and XON XOFF DTE DCE flow control amp Mn Communication Mode Same as amp Q0 amp Pn Select Pulse Dialing Make Break Ratio amp P0 amp P amp P1 amp P2 amp P3 Sets a 39 61 make break ratio 10 pps used in USA Default Sets a 33 67 make break ratio 10 pps Sets a 39 61 make break ratio 20 pps Sets a 33 67 make break ratio 20 pps amp Qn Asynchronous Mode Selection This command is an extension of the amp M command and is used to control the connection modes permitted It is used in conjunction with S36 and S48 amp Q0 amp Q5 amp Q6 Select direct asynchronous operation The value 000b is written to S27 bits 3 1 and 0 respectively The modem will try to negotiate an error corrected link The modem can be configured using S36 to determine whether a failure will result in the modem returning on hook or will result in fallback to an asynchronous connection The value 101b is written to S27 bits 3 1 and 0 respectively Default Select asynchronous operation in normal mode speed buffering The value 110b is written to S27 bits 3 1 and 0 respectively amp Sn DSR Option Determines whether DSR operates in accordance with the EIA 232 D specification or remains ON amp SO0 DSR is always ON Default amp S1 DSR will become active after answer tone ha
27. VOICE FAX DATA MODEM USER S MANUAL Table of Contents i FCC DOC REQUIREMENTS i 1 FCC General Information i 2 FCC Notice i 3 DOC Notice 1 INTRODUCTION 2 COMMAND REFERENCE 2 1 General Command Information 2 2 AT Commands 2 2 a Commands Preceded by amp 2 2 6 Commands Preceded by 2 2 c Commands Proceeded by 2 2 d Commands Preceded by 2 2 e Commands Preceded by 2 3 Dial Modifiers 2 4 Commands Not Preceded By AT 2 5 Result Codes 3 S REGISTER REFERENCE 3 1 Register Summary 3 2 Glossary of the S Registers 4 TESTING 4 1 Local Analog Loopback 4 2 Local Analog Loopback with Self Test 5 TROUBLESHOOTING GUIDE 6 APPLICATION EXAMPLES 6 1 Dialing a Remote Modem 6 2 Dial a Stored Number 6 3 Manual Answer an Incoming Call 6 4 Auto Answer an Incoming Call 6 5 Voice to Data Switching A MNP 10 COMMANDS B CALLER ID COMMANDS C TECHNICAL SPECIFICATIONS D QUICK REFERENCE E GLOSSARY F ASCII CODE TABLE i FCC DOC REQUIREMENTS i 1 FCC General Information The Federal Communications Commission FCC of the United States restricts specific uses of modems and places registration responsibilities on both the manufacturer and the individual user 1 The modem may not be connected to a party line or to a coin operated telephone 2 The modem manufacturer must make any repairs to the modem to maintain valid FCC registration 3 Notification to the telephone company is no longer required prior
28. and all but the last command line end with the followed by a carriage return A Tone Control Toggles calling tone enable disable applicable to current dial attempt only J Perform MNP Perform MNP 10 link negotiation at 1200 bps for this call only K Enable Power Level Enable power level adjustment during MNP 10 link negotiation for this call only L Re dial Last Number The modem will re dial the last valid telephone number The L must be immediately after the D with all the following characters ignored P Pulse Dialing P placed ahead of a number tells the modem to dial a number using pulse dialing S Dial a Stored Number S is used to dial one of four numbers stored in nonvolatile memory For example instead of entering a dial string you can use this command Command ATDTS 1 lt CR gt T Touchtone Dialing T placed ahead of a number tells the modem to dial a number using touchtone dialing WwW Wait for Dialtone W placed after a number tells the modem to wait up to 30 seconds to detect a one second continuous dialtone before dialing the next number W is most often used in a PBX system to wait for the dialtone of an outside telephone line 2 4 Commands Not Preceded by AT Two commands A and are neither preceded by the attention code AT nor followed by a carriage return A Repeat Command A repeats the execution of the last command line stored in the command buffer If the last command line i
29. ang Up Identification Control Speaker Volume Monitor Speaker On Off Automode Enable Return to On line Data Mode Set Pulse Dial as Default Result Code Display Reading and Writing to S Registers Set Tone Dial as Default Select Word or Digit Result Codes Negotiation Progress Reporting Extended Result Codes Enables or Disables Long Space Disconnect Reset Select DCD Options DTR Option Fetch Factory Configuration Set Guard Tone DTE Modem Flow Control Communication Mode amp Pn amp Qn amp Sn amp Tn amp V amp Wn amp Yn amp Zn Bn Gn Kn Nn Vn Cn En L Q MS kk Select Pulse Dialing Make Break Ratio Asynchronous Mode Selection DSR Option Testing and Diagnostics See Chapter 4 View Configuration Profiles Store the Current Configuration to Nonvolatile RAM Select the Default Profile Store Telephone Numbers n 0 to 3 Select Maximum MNP Block Size Transmit Break to Remote Modem to Modem Flow Control XON XOFF Break Control Operating Mode Control Single Line Connect Message Enable Enable Disable Data Compression Enable Disable Line Quality Monitor and Auto Retrain or Fallback Fall Forward Report Received Signal Level Line Signal Quality Select Modulation Download to Flash Memory For models with flash Memory only Answer Pause Initiate a Hookflash Return to Command State after Dialing Tone Control Perform MNP Enable Power Level rc Re dial Last Number Pulse
30. asy for you to use Just read the installation procedures in the installation manual and you are ready to begin operation If you are new to modem communications we recommend that you read through this manual first If you come across terms that you don t understand consult the glossary Words in boldface type are command names commands or default settings Carriage returns Enter are noted with lt CR gt or ENTER this does not mean to enter these characters literally but instead to press the Enter key The communication software which should be used depends on the kind of machine that you are going to communicate with If you are going to call a FAX machine then you must use the Fax software If the machine that you are going to communicate with is a modem then you must use a data modem communications software Note This manual is written to be used for several models of Fax Data Modems Some of the information in this manual may not apply to your fax data modem All the description in this manual about Caller ID V 90 and Fax class 2 applies only to the models which support these functions 2 COMMAND REFERENCE This chapter provides an alphabetized reference with examples for all commands for the modem The system of commands is depicted below in Figure 2 1 To use these commands for dialing or configuring the modem make sure the communications software package you will be using lets you operate the modem through its internal c
31. bles the test timer When the timer is thus disabled all tests must be ended with the amp TO command Range 0 255 seconds S21 V 24 General Bit Mapped Options Bit Value Description bit 0 0 amp JO 1 amp J1 bit 2 0 amp RO 1 amp R1 bit 3 4 00 amp DO 01 amp D1 10 amp D2 11 amp D3 bit 5 0 amp CO 1 amp C1 bit 6 0 amp SO 1 amp S1 bit 7 0 Yo 1 Y1 22 SPEAKER Results Bit Mapped Options Bit Value Description bit 0 1 00 Select LO 01 Select L1 10 Select L2 11 Select L3 bit 2 3 00 Select MO 01 Select M1 10 Select M2 11 Select M3 bit4 5 6 000 Select X0 001 Reserved 010 Reserved 011 Reserved 100 Select X1 101 Select X2 110 Select X3 111 Select X4 bit 7 RESERVED 23 Bit Mapped Options Bit Value Description bit 0 0 amp T5 1 amp T4 default bit 1 2 3 000 Communications rate 300 bps 001 Communications rate 600 bps 010 Communications rate 1200 bps 011 Communications rate 2400 bps 100 Communications rate 4800 bps 101 Communications rate 9600 bps 110 Communications rate 19200 bps 111 Communications rate 38400 bps or higher bit 4 5 00 Even parity selected 01 Not used 10 Odd 11 None bit 6 7 00 amp GO 01 amp G1 10 1800HZz amp G2 24 Sleep Inactivity Timer Set the length of time in units of 10 seconds that the modem will operate in normal mode with no detected telephone line of DTE line activity before entering low power slee
32. d Form Reporting The modem presents all information and packet control information found in the message The modem however excludes the leading U s channel seizure information from the presentation The packet is presented in ASCII printable hex numbers the modem does not insert spaces or line feeds for formatting between bytes or words of the packet The modem does not detect the checksum of the packet Example of Unformatted From Reporting RING 0412303332323234303539313435353132333435 RING RING C TECHNICAL SPECIFICATIONS C 1 Features Data Rates bps K56flex 300 1200 2400 4800 7200 9600 12000 14400 19200 21600 24000 26400 28800 31200 32000 33600 34000 36000 38000 40000 42000 44000 46000 48000 50000 52000 54000 56000 V 90 56000 54667 53333 52000 50667 49333 48000 46667 45333 42667 41333 40000 38667 37333 36000 34667 33333 32000 30667 29333 28000 Receive only Compatibility Data ITU T V 90 for modem which supports V 90 only V 34 V 32 bis V 32 V 22 bis V 23 V 22 and V 21 Bell 212A and 103 K56flex Fax ITU T V 17 V 29 V 27 ter and V 21 ch 2 Command Set Enhanced AT command set Fax Class 1command Flow Control Xon Xoff Hardware RTS CTS Data Compression V 42bis MNP5 Error Correction V 42 MNP 2 4 Operation Full or Half duplex 28800 bps with 26400 24000 21600 19200 14400 9600 4800 2400 and 1200 bps auto fallback Test Modes Analog loopback local d
33. d if it fails the modem disconnects An MNP connection is attempted and if it fails a direct mode connection is established Reserved 111 An MNP connection is attempted and if it fails the normal mode connection is established 37 Desired Line Connection Speed bit 0 4 bit 5 7 Desired line connection speed This is interlinked with the Fn command If an invalid number is entered the number is accepted into the register but S37 will act as if the default value has been entered 0 Attempt auto mode connection 1 3 Attempt to connect at 300 bps 4 Reserved 5 Attempt to connect at V 22 1200 bps 6 Attempt to connect at V 22bis 2400 bps 7 Attempt to connect at V 23 8 Attempt to connect at V 32 bis V 32 4800 bps 9 Attempt to connect at V 32 bis V 32 9600 bps 10 Attempt to connect at V 32 bis 12000 bps 11 Attempt to connect at V 32 bis 14400 bps 12 Attempt to connect at V 32 bis 7200 bps Reserved 38 Delay Before Forced Disconnect This register controls how long the modem waits after receiving the ATH command or loss of DTR before it disconnects from the telephone line When connected in an error corrected mode you can use this register to ensure that all data is transmitted from the modem s buffer before the modem disconnects If you set S38 between 0 and 254 the modem waits that number of seconds for the remote modem to acknowledge all data before it disconnects If you set S38 to 25
34. ed correctly during this test both the modem and the local computer or terminal are functioning correctly If incorrect characters appear on the screen either the local computer or terminal or the local modem is in error To perform a local analog loopback put the local modem in the command state If it is on line issue the escape command to return to the command state Local Modem Transmitter Telephone PC Analog Loop Line Receiver Fig 4 1 Data Path for Local Analog Loopback Example 1 test timer disabled Command AT amp Q0 lt CR gt ATS18 0 amp TI lt CR gt Result CONNECT 56000 Test message THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG 1234567890 Escape return to the on line command state Result code OK Command AT amp TO lt CR gt end the test Result code OK Here the test timer is disabled and the modem sets up an internal analog loop as shown in Figure 4 1 When the loopback is established the modem goes on line and the test message any character you type is looped back on the screen for verification Finally returns the modem to the command state and amp TO ends the test and breaks the internal analog loop The following command sequence is the same as the previous one except that the test timer is set to 60 seconds At the end of the test time the timer expires the test ends and the test result is reported Example 2 test timer enabled Command AT amp Q0 lt CR gt
35. er mode detection phase Result Codes OK n Oor1 ERROR Otherwise Qn Enable Fallback to V 22 bis V 22 Enables or disables fallback from MNP 10 to V 22 bis V 22 The parameter value if valid is written to S41 bit 7 Q0 Disables fallback to 2400 bps V 22bis and 1200 bps V 22 Fallback is enabled only to 4800 bps Q1 Enables fallback to 2400 bps V 22bis and 1200 bps V 22 default Result Codes OK n Oor1 ERROR Otherwise B CALLER ID COMMANDS CIDn Caller ID Enables or disables Caller ID for U S A This command only apply to models which support the Caller ID function CID 0 Disables Caller ID Default CID 1 Enables Caller ID with formatted presentation to the DTE The modem will present the data items in a lt Tag gt lt Value gt pair format The expected pairs are data time caller code telephone number and name CID 2 Enables Caller ID with unformatted presentation to the DTE The modem will present the entire packet of information excluding the leading U s in ASCII printable hex numbers Result Codes OK n 0 or 2 ERROR Otherwise Inquiries CID Retrieves the current Caller ID mode from the modem CID Returns the mode capabilities of the modem in a list with each element separated by commas Formatted Form Reporting The modem presents the data in the lt tag gt lt value gt pair format as described in the table below Spaces are present on both sides of the equal sign
36. format was used reinitiate the upload at step 7 using a correct firmware hex file A Device successfully programmed message is displayed by the FLM at the completion of a successful download and the modem will do a cold start 2 3 Dial Modifiers This section describes all of the dial modifiers which are used in dial strings Answer placed after a phone number this modifier tells the modem to wait for 5 seconds of silence before dialing the next number in the dial string is usually used to access a secure computer system that provides a silent answer as permission for further entrance Pause nn placed anywhere in the dial string tells the modem to pause for the number of seconds specified by S register S8 before processing the rest of the dial string Initiate a Hookflash placed anywhere in the dial string tells the modem to initiate a hookflash which means to hang up for 0 5 seconds and then go off hook again before processing the rest of the dial string This modifier allows access to PBX features like call transferring Return to Command State after Dialing wot 3 which must be placed at the end of the dial string returns to the command state after dialing the number placed ahead of it A long telephone number would overflow the 40 character command buffer if placed all in one command line so it must be broken into two or more command lines Each part includes men part of the number
37. han that in S9 or else the modem disconnects before it recognizes the carrier Range 1 255 tenths of a second S11 DTMF Touch tone Tone Duration S11 determines the duration and spacing of tones for Dual Tone Multifrequency DTMF dialing This value has no effect on pulse dialing Range 50 255 milliseconds 12 Escape Guard Time S12 determines the escape guard time The escape guard time is the minimum waiting time required before and after entering the escape code three consecutive escape characters in the on line state It is also the maximum waiting time allowed between any two consecutive escape characters If the waiting time before or after the escape code is shorter than the guard time or if the waiting time between consecutive escape characters is longer than the guard time then the modem does not recognize the escape command and stays on line If the escape guard time is set at 0 second it is impossible to return the modem to command state Range 0 255 1 50 of a second 14 Bit Mapped Options Bit Value Description bit 1 E 0 Disabled 1 Enabled bit 2 Q 0 Disabled 1 Enabled bit 3 V 0 Numeric 1 Verbose bit 4 Reserved bit 5 P or T 0 T Tone dial 1 P Pulse dial bit 6 Reserved bit 7 0 Answer mode 1 Originate mode S18 Test Timer The test timer determines how long tests are performed The modem automatically ends the test when the test time is expired The default value of 000 disa
38. igital loopback and remote digital loopback Audio Monitor Built in speaker with software controllable volume control Guard Tone 550 1800 Hz Compliance FCC 15 amp 68 Command Buffer 40 characters Extra Memory 4 x 36 digits Transmit Level 11 1 dBm Receive Sensitivity 40dBm Pulse Dialing Specifications International Make Break Ratio Break Length Dial Pulse Length Dial Pulse Rate Interdigit Time Compatibility 56000 54667 53333 52000 50667 49333 4s000 46667 45333 42667 41 333 40000 38667 37333 36000 34667 33333 32000 30667 29333 28000 56000 54000 52000 50000 48000 46000 44000 42000 440000 38000 36000 34000 32000 33600 31200 28 3800 2640 0 24000 2 160071920 07168007 14400 K56flex v 34 ITU T 32bis 14400 9600 bps asynchronous synchronous ITU T 32 9600 4800 bps asynchronous synchronous ITU T 22 bis 24004 200 bps asynchronous synchronous ITU T 23 1200 75 bps asynchronous synchronous ITU T 22 ITU T 21 1200 bps asynchronous synchronous 300 bps asynchronous Bell 2124 1200 bps asynchronous synchronous Bell 103 300 bps asynchronous ITU T 26 A 2400 half duplex G Ill Group 3 fax B QUICK REFERENCE A Bn Cn D En Hn Sn Vn Xn Yn Zn amp Cn amp Dn amp F amp Gn amp Kn amp Mn Go On line in Answer Mode Select Protocol to 300 bps or 1200 bps Carrier Transmit Control Go On line in Originate Mode Command Echo H
39. ipment to insure compliance with the pertinent RF emission limits governing this device Changes or modifications not expressly approved by the manufacturer could void the user s authority to operate this equipment NOTE The manufacturer is not responsible for any radio or T V interference caused by unauthorized modifications to this equipment Such modifications could void the user s authority to operate the equipment i 3 DOC Notice Notice The Canadian Department of Communications label identifies certified equipment This certification means that the equipment meets certain telecommunications network protective operational and safety requirements The Department does not guarantee the equipment will operate to the user s satisfaction Before installing this equipment users should ensure that it is permissible to be connected to the facilities of the local Telecommunications Company The equipment must also be installed using an acceptable method of connection In some cases the companies inside wiring associated with a single line individual service may be extended by means of a certified connector assembly telephone extension cord The customer should be aware that compliance with the above conditions might not prevent degradation of service in some situations Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier Any repairs or alterations made by the user to this equi
40. lue is decimal coded in units of bps e g 14400 specifies the highest rate to be 14400 bps The default is 28800 for 28800 bps 5 lt x_law gt is an optional number which specifies the codec type The options are O p Law 1 A Law Note that ATZ will reset the lt x_law gt selection to 0 u law Also note that the lt x_law gt parameter in a MS command overrides a previous Un command and a Un command overrides the lt x_law gt setting specified in a previous MS command 6 lt rb_signaling gt is an optional number which enables or disables robbed bit signaling generation in a server modem or enables or disables robbed bit signaling detection in a client modem The options are 0 Robbed bit signaling generation server modem or detection client modem disabled Default 1 Robbed bit signaling generation server modem or detection client modem enabled Note that ATZ will reset the lt rb_signaling gt selection to 0 Default Result Codes OK Valid subparameter string ERROR Otherwise 2 2 e Commands Preceded by ine Download to Flash Memory The linear flash memory downloader in the modem firmware allows flash memory connected to the modem external memory bus to be upgraded with revised modem firmware This process transfers uploads the upgraded modem firmware data from the host computer to the modem which transfers downloads the data to the flash memory device Note that this command apply only to the m
41. m in leased line operation mode En Command Echo EO E Disables command echo E1 Enables command echo Default Hn Hang Up H0 H Goes on hook Hangs up H1 Goes off hook ready to dial In Identification 10 1 Report the product code Ln Mn Nn On P Causes the modem to assume that all subsequent dial commands are pulse dials You may omit the P 1 Report the hardware checksum 12 Report ERROR 13 Report firmware revision 14 Report OEM defined identifier string 15 Report the country code parameter 16 Report modem data pump model and internal code revision I7 Report the DAA code Control Speaker Volume LO L Low volume L1 Low volume Default L2 Medium volume L3 High volume Monitor Speaker On Off M0 M Speaker is always off M1 Speaker is off while receiving carrier Default M2 Speaker is always on M3 Speaker disabled while dialing or receiving carrier Automode Enable NO Automode detection is disabled N1 Automode detection is enabled This command is equivalent to FO Default Return to On Line Data Mode o0 Enters on line data mode without a retrain Handling is determined by the Call Establishment task Generally if a connection exists this command connects the DTE back to the remote modem after an escape 01 Enters on line data mode with a retrain before returning to on line data mode Set Pulse Dial as Default from the dial strings Q Result Code Display
42. mpression when the modem establishes an error corrected link The default is for the modem to use data compression 138 Value Description 136 Execute error correction protocol with no compression 138 Execute error correction protocol with compression S48 V 42 Negotiation Action Value Description 0 Disable negotiation bypass the detection and negotiation phases 7 Enable negotiation 128 Disable negotiation bypass the detection and negotiation phases 82 Break Handling Option S82 is for compatibility purposes only changing this register will not any affect S86 Call Failure Reason Code When the modem issues a NO CARRIER result code a value is written to this S Register to help determine the reason for the failed connection S86 records the first event that contributes to a NO CARRIER message The cause codes are Range 0 4 5 9 12 13 or 14 S86 0 Normal disconnect no error occurred S86 4 Loss of carrier S86 5 V 42 negotiation failed to detect an error correction modem at the other end S86 9 The modems could not find a common protocol S86 12 Normal disconnect initiated by the remote modem S86 13 Remote modem does not respond after 10 retransmission of the same message S86 14 Protocol violation 91 PSTN Transmit Attenuation Level Sets the transmit attenuation level from 0 to 15 dBm for the PSTN mode resulting in a transmit level from 0 to 15 dBm Range 0 to 15 dBm Corresponding to
43. odem with flash memory Programming the flash memory device is a two step process 1 When the AT command is issued the modem firmware boot loader is invoked and the user will first load a flash load module FLM into the modem s RAM The FLM contains the programming algorithm for the flash memory device being programmed and any messages that may be sent during the load process 2 The user will then load the new modem firmware which the FLM will then program into the flash memory device Procedure 1 8 Install in the modem a flash memory programmed with the modem firmware ensure that the flash memory device is programmed with the sector secure mode set to UNSECURE AMD only otherwise the device connot be re programmed in the modem Put the FLM file and the new modem firmware file e g V1400DS S37 in an appropriate directory on the computer s hard disk Configure the communications application program for a DTE rate of between 9600 bps and 57600 bps 57600 bps is faster and RTS CTS flow control A load at 57600 bps will take approximately 2 minutes a load at 19200 bps will take approximately 6 minutes Check the modem for response by typing AT Initiate the download process using the AT n command where AT AT 0 download speed is the last sensed speed recommended command AT 1 Download speed is 38 4k bps AT 2 Download speed is 57 6k bps The Download initiated message appears upon issuing
44. ommands If your software permits use of the modem s internal commands read this chapter If not read your software user s manual and ignore the rest of this manual Commands Commands not Commands Preceded by AT Preceded by AT A Escape Standard AT Extended AT Command Command Commands Commands Fig 2 1 System of Commands 2 1 General Command Information Except for the A command and the escape command described in Section 2 4 all commands must be prefixed with the attention code AT For instance the A command below would be entered as AT A lt CR gt Without the AT prefix the command line cannot be executed Once entered AT cannot be deleted with the Backspace or Delete key More than one command can be placed on a single line and if desired separated with spaces for readability Once the carriage return Enter key is pressed the command line is executed A line with no carriage return is ignored The modem accepts either upper or lower case characters in the command line and ignores any spaces within or between commands Typing errors can be corrected with the Backspace key Exceptions are noted in the description of specific commands Variables r and x are listed in Italics Punctuation symbols use as dial modifiers are listed alphabetically according to their English names at the beginning of Section 2 3 Where two commands are separated by a slash either command will have the same effect For example if
45. p mode Range 0 255 seconds 25 Delay to DTR S25 serves two purposes When the modem is operating in synchronous mode 1 the value assigned to S25 specifies the length of time the modem waits after a connection has been made before examining DTR This allows the modem to ignore an ON to OFF transition of DTR giving the user time to disconnect the modem from the asynchronous terminal and attach it to a synchronous terminal without forcing the modem back to the asynchronous command mode During this time the value for S25 is read in whole seconds In all other modes and after call establishment in synchronous modes 1 and 4 the value is read in 1 100 seconds In any mode a change in DTR ON or OFF that persists for a period shorter than the value held in S25 is ignored by the modem while it is in data mode Range 0 255 1 second for synchronous mode 1 0 01 second otherwise 26 RTS to CTS Delay Interval Pertains to synchronous operation only When CTS tracks RTS amp R0O and the modem detects an ON to OFF transition on RTS this register sets the time delay before the modem turns CTS to ON Range 0 255 hundredths of a second 28 Bit Mapped Option Status bit 0 1 Reserved bit 2 Reserved bit 3 4 Pulse dialing amp Pn 0 39 61 make break ratio at 10 pulse per second amp P0 1 33 67 make break ratio at 10 pulse per second amp P1 2 39 61 make break ratio at 20 pulse per second amp P2 3
46. pment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particularly important in rural areas Caution Users should not attempt to make such connections themselves but should contact the appropriate electric inspection authority or electrician as appropriate The Load Number LN assigned to each terminal device denotes the percentage or the total load to be connected to a telephone loop which is used by the device to prevent overloading The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all the devices does not exceed 100 Note Locate an analog telephone line Many offices have digital telephone lines which will not work with a modem Warning Do not connect your modem to a digital telephone line Modems are designed for use only with analog telephone lines connecting to a digital telephone line may damage the modem Verify that the line is analog before connecting Fax machines use analog telephone lines If you can t find an analog voice line find a fax machine and use its line 1 INTRODUCTION Congratulations on your purchase of this outstanding Fax Da
47. r correction mode a 300 ms break is passed Gn Modem to Modem Flow Control XON XOFF Enables or disables modem flow control during a Normal Mode connection Since Reliable Mode has its own method of flow control the Gn command is ignored when error correction is selected However DTE to modem flow control remains active during reliable link GO Disable flow control Default G1 Enable flow control Kn Break Control Determines the modem s response when a BREAK is received from the DTE or the remote modem according to the following conditions When a BREAK is received from the DTE during Normal or MNP Mode KO 2 4 Modem enters Command Mode waiting for an AT command without sending a BREAK to the remote modem K1 Modem clears the terminal and modem buffers K3 Modem does not clear the buffers K5 ei on a BREAK to the remote modem in sequence with any transmitted data efault When a BREAK is received from the remote modem during Normal Mode KO 1 Modem clears the terminal and modem buffers K2 4 Modem does not clear the buffers K4 5 Modem sends a BREAK in sequence with any transmitted data When a BREAK is received from the DTE during Direct Mode KO 2 4 Modem sends a BREAK to the remote modem K1 3 5 Modem sends a BREAK to the remote modem Nn Operation Mode Control Selects the operating mode to be used during connection NO Selects Normal speed buffering Mode Same as amp Q6 N1 Selects Direct
48. s are displayed as rate TX rate RX e g 1200 TX 75 RX Symmetric rates are displayed as a single DCE rate e g 14400 Voice and Data Blank for Data mode only SVD for AudioSpan analog simultaneous audio voice and data DSVD for G 729A or DigiTalk digital simultaneous voice and data 2 2 c Commands Preceded by C Enable Disable Data Compression Enables or disable data compression negotiation The modem can only perform data compression on an error corrected link The parameter value if valid is written to S41 bits O and 1 CO Disables data compression Resets S46 bit 1 C1 Enables MNP 5 data compression negotiation Resets S46 bit 1 C2 Enables V 42 bis data compression Sets S46 bit 1 C3 Enables both V 42 bis and MNP 5 data compression Sets S46 bit 1 Default Result Codes OK n 0 1 2 or 3 ERROR Otherwise En Enable Disable Line Quality Monitor and Auto Retrain or Fallback Fall Forward Control whether or not the modem will automatically monitor the line quality and request a retrain E1 or fall back when quality is insufficient or fall forward when line quality is sufficient E2 Applies to dial up line only The parameter value valid is written to S41 bits 2 and 6 If enable the modem attempts to retrain for a maximum of 30 seconds EO Disable line quality monitor and auto retrain E1 Enable line quality monitor and auto retrain E2 Enable line quality monitor and fallback fall forward Default
49. s been detected and inactive after the carrier has been lost amp Tn Testing and Diagnostics See Chapter 4 Testing commands must be initiated in command mode at the end of the command line with asynchronous operation in the Direct mode selected amp QO at a speed of 1200 bps or faster A telco connection must be established prior to loopback tests If these conditions are not met an ERROR result code is issued If a local analog loopback is initiated while the modem is connected the modem disconnects beforeperforming the test A test remains active for the period of time specified in register S18 If S18 is zero the test aborts when the user issues the amp TO command amp TO amp T Terminates any test currently in progress amp T1 Initiates a local analog loopback in accordance with ITU T V 54 L3 verifies the path between the local DTE and the local modem amp T8 Initiates a local analog loopback with self test in accordance with ITU T V 54 L2 amp V View Configuration Profiles amp V Displays the active configuration profile amp Wn Store the Current Configuration to Nonvolatile RAM amp WO Writes the current active configuration to profile 0 in nonvolatile RAM amp W1 Writes the current active configuration to profile 1 in nonvolatile RAM amp Yn Select the Default Profile amp YO amp Y Uses profile 0 on power up Default amp Y1 Uses profile 1 on power up amp Zn Store Telephone Numbers n 0to3 amp Zn
50. s invalid the ERROR result code will appear on the screen Note that A cannot be preceded by AT if it is ERROR will appear on the screen Escape followed by AT lt CR gt allows the modem to escape from the data mode to the on line command state command state without breaking the established connection To escape stop transmitting data wait at least one escape guard time the default time is one second and then enter three consecutive escape characters the default character is followed by AT lt CR gt The modem will return to the command state and send the OK result code to the screen Note that the escape command is the only command that can be recognized by the modem in the one line state it cannot be recognized in the command state 2 5 Result Codes The modem sends a response to the user via the screen after a command is issued As shown in the figure below there are two forms for each result code Modem Response code and digit code Modem Response Digit Description OK 0 Command executed without errors CONNECT Connect to another modem 1 RING 2 Detect an incoming ring NO CARRIER 3 Carrier lost or never detected ERROR 4 Invalid command or invalid character CONNECT 1200 5 Connection established at 1200 bps NO DIALTONE 6 Dial tone not detected within timeout BUSY 7 Detected a busy tone after dialing NO ANSWER 8 No ringback or quiet answer was detected by the modem CONNECT 600 9 Connection established a
51. t 600 bps CONNECT 2400 10 Connection established at 2400 bps CONNECT 4800 11 Connection established at 4800 bps CONNECT 9600 12 Connection established at 9600 bps CONNECT 7200 13 Connection established at 7200 bps CONNECT 12000 14 Connection established at 12000 bps CONNECT 14400 15 Connection established at 14400 bps CONNECT 19200 16 Connection established at 19200 bps CONNECT 38400 17 Connection established at 38400 bps CONNECT 57600 18 Connection established at 57600 bps CONNECT 115200 19 Connection established at 115200 bps CONNECT 230400 20 Connection established at 230400 bps CONNECT 1200RX 75TX 22 V 23 connection established transmit at 75 bps receive at 1200 bps CONNECT 75RX 1200TX 23 V 23 connection transmit at 1200 bps receive at 75 bps DELAYED 24 Call fails to connect and number dialed is considered delayed due to country blacklisting requirements BLACKLISTED 32 Call fails to connect and the number dialed is considered blacklisted FAX 33 A fax modem connection is established in a facsimile mode DATA 35 A data modem connection is established in a facsimile mode CARRIER 300 40 Carrier detected CARRIER 1200TX 75RX V 23 44 Carrier detected CARRIER 75RX 1200TX V 23 45 Carrier detected CARRIER 1200 46 Carrier detected CARRIER 2400 47 Carrier detected CARRIER 4800 48 When the 4800 bps data rate in V 32 bis or V 32 mode has been detected on the line CARRIER 7200 49 When the 7200 bps data rate in V 32 bis mode
52. t any time by entering the amp F command 3 1 Register Summary The following chart summarizes your modem s registers Default Reg Range Unit Dec Hex Description SO 0 255 rings 0 00h Number of rings before auto answer S1 0 255 rings 0 00h Ring count S2 0 255 ASCII 43 2Bh Escape character code S3 0 127 ASCII 13 ODh Command terminator lt CR gt character S4 0 127 ASCII 10 OAh Line feed character S5 0 255 ASCII 8 08h Backspace character S6 2 255 seconds 2 02h Wait time for blind dialing S7 1 255 seconds 50 32h Wait time for carrier after dial S8 0 255 seconds 2 02h Pause time for comma dial delay S9 1 255 1 10 sec 6 06h Carrier detect response time S10 1 255 1 10 sec 14 OEh Lost carrier to hang up delay S11 50 255 1 1000 sec 95 5Fh DTMF Tone Duration S12 0 255 1 50 sec 50 32h Escape code timing 14 Bit Mapped Options 138 8Ah S18 0 255 seconds 0 00h Test mode timer 21 Bit Mapped Options 4 04h V 24 General bit mapped options 22 Bit Mapped Options 117 75h Speaker Results Bit mapped options 23 Bit Mapped Options 54 36h S24 0 255 seconds 0 00h Sleep Inactivity Timer S25 0 255 seconds 5 05h Dalay to DTR S26 0 255 1 100 sec 1 Oth RTS to CTS Delay Interval 28 Bit Mapped Options 0 00h S29 0 255 10 ms 70 46h Flash Dial Modifier Time S30 0 255 10s 0 00h Inactivity Disconnect Timer S31 Bit Mapped Options 194 C2h 32 0 255 ASCII 17 11h XON Character 33 0 255 ASCII 19 13h XOFF Character
53. ta Modem This manual describes how to operate your new Fax Data Modem Instructions for installing your Fax Data Modem will be found in the Installation Manual while the information in this manual deals exclusively with the operation of the modem after it is installed such as the command set the internal configuration registers troubleshooting and testing Features These Fax Data Modems combine the features of a 56000 receive only 33600 28800 14400 9600 bps data modem and a 14400 9600 bps FAX modem Your new Fax Data Modem gives your personal computer the ability to send and receive FAX messages over the telephone line like a standard FAX machine Your Fax Data Modem also allows your PC to communicate with other personal computers terminals or BBS s Bulletin Board Systems through the data modem functions When used as a data modem your Fax Data Modem uses the standard AT command set and is fully compatible with ITU T V 42 V 42bis V 34 ANNEX 12 V 32bis V 32 V 22bis V 23 V 22 V 21 MNP 2 5 Bell 103 212A K56flex and or V 90 When used as a Fax Data Modem it communicates with all ITU T Group 3 FAX machines and is compatible with ITU T V 27ter and V 29 V 17 T 4 and T 30 Switching between DATA mode operation and FAX mode operation of your Fax Data Modem is done through its firmware no hardware settings are required If you are already familiar with the use of a modem and the Hayes AT command set this modem will be extremely e
54. tate the modem cannot hang up until the power is turned off or the remote modem hangs up Range 0 255 ASCII decimal S3 ASCII Value of Carriage Return S3 stores the ASCII value of the carriage return character Pertains to asynchronous operation only Range 0 127 ASCII decimal S4 ASCII Value of Line Feed Character S4 stores the ASCII value of the line feed character if your computer does not recognize the default as a line feed change the value A value greater than 127 disables the line feed When disabled the line feed character that precedes or follows a result code is canceled Pertains to asynchronous operation only Range 0 127 ASCII decimal S5 ASCII Value of Backspace Character S5 stores the ASCII value of the backspace character The backspace is used to edit a command line If your computer does not recognize the default as a backspace change the value Pertains to asynchronous operation only Set S5 to any value from 0 to 31 or 127 Do not set it to any value from 32 through 126 because these values correspond to printable ASCII characters A value greater than 127 disable the backspace and makes it impossible to edit a command line Range 0 32 ASCII decimal S6 Wait Time before Blind Dialing S6 controls how long the modem waits after it goes off hook before it dials the first digit of the telephone number The modem always pauses for at least 2 seconds even if S6 is set to less than two seconds
55. th a regular phone Also the remote modem may not recognize your modem s baud rate Your Can t Transmit After You Have Connected to the Remote Modem In this case check the communication parameters of the remote modem then configure your software to the same number of data bits stop bit and parity 6 APPLICATION EXAMPLES 6 1 Dialing a Remote Modem Command line ATDP9WT002 886 7128423 lt CR gt This command line instruct the modem to dial a remote modem through a PBX The modem first use pulse dialing to dial 9 the access code of the PBX wait for outside dial tone and then use touch tone dialing to dial 002 once a one second continuous dial tone is detected within 30 seconds pause for 2 seconds if S8 2 and then dial 8867128423 6 2 Dialing a Stored Number Command line AT amp Z2 T03 709394 lt CR gt Command line ATDS 2 lt CR gt The first command line store the dial string T03 709394 to the 3rd location in NVRAM Afterwards you can use the second command line to dial this stored number The dial string T03 709394 will appear on the screen to indicate the number being dialed 6 3 Manual Answer an Incoming Call Command line ATA lt CR gt The factory setting of the S register SO is SO 0 This condition disables the auto answer capability so that you must issue an ATA command to answer a call At power up your modem always monitors if there are incoming rings If incoming rings are detected your modem will display res
56. the 33600 bps data rate in V 34 mode has been detected on the line PROTOCOL ALT 80 PROTOCOL ALT CELLULAR 81 CONNECT 33600 84 Connection established at 33600 bps CONNECT 31200 91 Connection established at 31200 bps CARRIER 32000 150 Connection established at 32000 bps CARRIER 34000 151 Connection established at 34000 bps CARRIER 36000 152 Connection established at 36000 bps CARRIER 38000 153 Connection established at 38000 bps CARRIER 40000 154 Connection established at 40000 bps CARRIER 42000 155 Connection established at 42000 bps CARRIER 44000 156 Connection established at 44000 bps CARRIER 46000 157 Connection established at 46000 bps CARRIER 48000 158 Connection established at 48000 bps CARRIER 50000 159 Connection established at 50000 bps CARRIER 52000 160 Connection established at 52000 bps CARRIER 54000 161 Connection established at 54000 bps CARRIER 56000 162 Connection established at 56000 bps CONNECT 32000 165 Connection established at 32000 bps CONNECT 34000 166 Connection established at 34000 bps CONNECT 36000 167 Connection established at 36000 bps CONNECT 38000 168 Connection established at 38000 bps CONNECT 40000 169 Connection established at 40000 bps CONNECT 42000 170 Connection established at 42000 bps CONNECT 44000 171 Connection established at 44000 bps CONNECT 46000 172 Connection established at 46000 bps CONNECT 48000 173 Connection established at 48000 bps CONNECT 50000 174 Connection established at 50000 bps
57. the AT n command Perform an ASCII upload of the FLM file e g AMDE S37 from the host computer to the modem RAM using an industry standard communications software of an equivalent process ensure that all ASII transmit or pacing is turned off To abort the load at this point wait for the FLM download process to time out send a bad S37 record or reset POR the modem If the load process times out the modem must be reset ATZ before the FLM can be loaded again After the FLM has been loaded perform an ASCII upload of the new modem firmwarehex file e g RC288ACi S37 from the host computer to the modem RAM using industry standard communications software or an equivalent process There will be a 3 second pause after the first record of the RC288AXX S37 file is sent which is the FLASH erase cycle There is no turning back at this point If the flash download fails because of a bad S37 record for example or the upload is aborted as long as the modem is not turned off or reset it will remain in the flash load cycle and the upload can be re attempted at step 7 A Wrong Device message is displayed if an incorrect FLM is used In this case restart at step 5 and upload the correct FLM file A Wrong Hex file or flow control message is displayed if an incompatible hex file format is used non Motorola S3 format or if the DTE ignores flow controls the flash download uses both Xon Xoff and RCS CTS flow control If the wrong
58. the command is listed as BO B issuing either BO or B will have the same effect 2 2 AT Commands A Go On line in Answer Mode This command instructs the modem to go off hook immediately and then make a handshake with the remote modem Handshaking is not available during leased line operation A is usually used to manually answer an incoming call or to switch from voice conversation to data communication Bn Select Protocol to 300 bps or 1200 bps BO B Selects ITU T 300 or ITU T 1200 protocol once the command line prefix AT has been entered at the 300 bps or 1200 bps data rate B1 Selects BELL 300 or BELL 212A protocol once the command line prefix AT has been entered at the 300 or 1200 bps data rate Default Cn Carrier Transmit Control Controls the transmit carrier The modem is preset to turn carrier on and off as necessary the C1 option The signal is on when the modem is calling or connected to a remote modem and is off when it is not The CO option is NOT valid co Not permitted returns ERROR result code C1 Normal transmits carrier switching preset D Go On line in Originate Mode D instructs the modem to go off hook immediately and automatically dial the number contained in the dial string following D The dial string may contain any of the dial modifiers contained in the following section The D command without a dial string is usually used to switch from voice conversation to data communication or to call a remote mode
59. to connecting registered equipment but upon request from the telephone company the user shall tell the telephone company which line the equipment is connected to as well as the registration number and ringer equivalence number of the registered protective circuitry FCC information is printed on a label on the bottom of the modem i 2 FCC Notice This equipment has been tested and found to comply with the limits for a digital device pursuant to Subpart B of Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates and uses radio frequency energy and if not installed and used the instructions may cause interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try and correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Shielded interconnect cables and a shielded power cord must be employed with this equ
60. ult codes on the screen as RING RING Seeing that you may issue the ATA command to answer the call This command must be entered within the quiet interval between any two rings 6 4 Auto Answer an Incoming Call Command line AT S0 2 amp W amp Y lt CR gt Auto answer can be enabled by changing the setting of the S register SO to a value between 1 and 255 In the above command line SO 2 instructs the modem to answer an incoming call automatically after the 2nd ring The amp W command writes this configuration to profile 0 in NVRAM amp Y command instruct the modem to load profile 0 as the active configuration on power up The last two commands make S0 2 the default value at power up or reset This example also shows the insertion of space between two neighboring commands to make the command line more readable 6 5 Voice to Data Switch Command line ATA lt CR gt or ATX1D lt CR gt If you are talking with a remote modem user through the telephone set and want to initiate data communication with the remote modem follow the procedures below 1 You or the remote user issue an ATA command first to switch to data communication 2 When the person on the other end hears an answer tone from the phone issues an ATX1D command X1 to disable the dial tone monitor to instruct the modem to go off hook and wait for a carrier If connection is successful the CONNECT XXXX result code will be displayed on the screen Now you can hang up
61. ure that the COM port address you have set your modem to corresponds to the appropriate selection in the communications software which you are using 2 Issue the ATZ command to reset your modem The returned result code should be 0 or OK depending on what communications program you are using Your modem is OK if you get one of these responses If there is no response after issuing the ATZ lt CR gt continue to the next step io Check if there are any other interface cards in your computer that use the same COM port address as your modem If so you must set your modem to another COM port address Keep in mind that on most systems only two COM ports are available One of them must be used as either 1 or 3 while the other must be used as 2 or 4 For example if a mouse is set to COM 1 your modem should be set to COM2 or COM4 Continue to the next step if the COM port address is OK 4 Issue the command AT amp F amp W lt CR gt if a 0 or OK result code is displayed on the screen your modem is OK Otherwise contact your dealer for assistance Your Modem Does Not Dial Out Make sure that your modem responds normally as described in section 4 1 If you can communicate through the keyboard check whether the modem is properly connected to the phone line Your Modem Does Not Connect After It Has Dialed a Phone Number The problem may have several causes The phone line may be too noisy or the telephone cord may be poor Try the line wi

VOICE/FAX/DATA MODEM USER'S MANUAL

Contents

Download Pdf Manuals

Related Search

Related Contents