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Hodnocené. / 5. Na základě hodnocení zákazníků
28
Chapter 5 - Command Mode
Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide
5.1 Introduction
AT commands are the means by which you, and your communications software, are able to
communicate with and configure your modem. They enable you to establish, read, and modify
parameters in addition to dialing. The following provides both a summary and a detailed explanation
of the AT commands recognized by the MultiModem.
5.1.1 AT Command Editing
The BACKSPACE key on your keyboard can be used to edit characters in the AT command line. An
AT command is not executed until the RETURN key is pressed. The BACKSPACE key erases the
previous character for reentering.
The BACKSPACE key does not erase the AT characters once they are entered. If your keyboard
has no BACKSPACE key, CTRL-H does the same thing. The character recognized by the modem
as BACKSPACE may be changed to any other ASCII character with S-Register S5.
If you wish to cancel an entire command that has been entered but not yet executed, enter CTRL-X.
This also clears the command buffer. The effect is the same as backspacing to cancel the entire
command, only quicker.
Characters entered in a command are stored in the modem's Command Buffer (memory) until
executed by hitting RETURN. The Command Buffer's capacity is sixty characters. The Attention
Characters AT do not count in the sixty allowed Command characters. Spaces, which may be used
for increased display readability, may be used when entering a command, but are not stored in the
Command Buffer and are not counted in the sixty allowed characters. Hyphens, parentheses, etc. are
not allowed.
If the sixty character limit is exceeded or if invalid characters are entered, the Command Buffer
automatically erases, and an ERROR message appears. You would then re-enter your command
within the sixty-character maximum, using only the allowed characters.
5.1.2 Functional Modes
The MultiModem can be in one of two functional states (see Figure 4-1). These are "Command
mode" and "On-line mode". (There is also an in-between state, "Wait-for-Carrier", where the modem
is out of Command mode but not yet really On-Line.
When the modem is initially powered up, it is in Command mode and is ready to accept commands
from your keyboard or software. The modem enters On-line mode after dialing, making a connection
with another modem, and then detecting a valid carrier signal. If no carrier is detected within a certain
time frame, the modem abandons the call and re-enters Command mode.
Once on line, the modem exits On-line mode if one of two conditions is met. If the carrier is lost or
intentionally dropped, the modem hangs up and re-enters Command mode. Also, if the modem
recognizes the Escape sequence for which it is configured (i.e., either the Escape characters in the
serial data stream, the Remote Escape characters in the modulated data stream, or the Break
signal), the modem will exit On-line mode, retain the datacomm link, and enter Command mode.
You can force the modem into On-line mode without dialing by sending the ATD or ATA command to
the modem.
- MT2834BA/MT2834BL Series 1
- Intelligent Data/Fax Modems 1
- User Guide 1
- Contents 3
- 1.1 Introduction 6
- 1.2 How To Use This Manual 6
- 1.3 Modem Features 7
- 1.4 Fax Features 8
- 1.5 Technical Specifications 9
- 1.6 Power 10
- 1.7 Modem LED Indicators 11
- 1.8 Controls on PC Board 12
- 2.2 Installation 14
- 2.2.1 Safety Warnings 14
- 2.2.2 Installation Procedure 14
- Figure 2-2. BL Connections 15
- 3.1 Introduction 18
- 3.2 Configuring Your Software 18
- 3.3 PC Initialization Strings 18
- 3.3.2 Other Parameters 19
- 3.5 Modem Basics 20
- 3.5.1 Simple Operations 20
- 4.1 Introduction 22
- 4.2 Dialing/On-Line/Answering 22
- 4.6 Dial-Up Operation 24
- 4.7 Manual Call Origination 24
- 4.8 Automatic Answering 25
- 4.9 Manual Answering 25
- 4.10 Handshaking Details 26
- 4.11 Call Termination 26
- Chapter 5 - Command Mode 27
- 5.1 Introduction 28
- 5.1.1 AT Command Editing 28
- 5.1.2 Functional Modes 28
- 5.2 Summary of AT Commands 29
- 5.3 Result Codes 32
- 5.4 Dialing Commands 33
- 5.4.2 Dial Modifier Commands 34
- Quiet Answer @ 36
- Storing Phone Numbers D...N 37
- Number Linking NN 37
- Modem Reset Z 38
- Unix UUCP Spoofing $SP 39
- Bell/V.21 Tone B 42
- Auto Speed Detect #A 43
- Carrier Detect Control &C 44
- CTS Control &R 44
- Data Set Ready Control &S 45
- Normal Mode &E0 46
- Auto-Reliable Mode &E1 46
- Reliable Mode &E2 46
- V.42 Mode Select #L 47
- Auto-Reliable Buffering $A 47
- Retransmit Count $R 48
- 5.4.9 Flow Control Commands 49
- Xon/Xoff Pass-Through &E7 50
- Send Xon/Xoff Characters #X 50
- Maximum Block Size &BS 51
- Parity Selection #P 51
- Through and Pacing Commands 52
- Speed Conversion $BA 53
- Modem Baud Rate $MB 53
- Serial Port Baud Rate $SB 54
- Help Screens $H 55
- Inquiry for Product Code I 55
- Listing S-Register Values L6 55
- Off Hook H 56
- BREAK AT<CR> 56
- 5.4.13 Line Probe Commands 57
- Chapter 6 - S-Registers 58
- 6.1 Introduction 59
- 7.1 Introduction 69
- Configuration 70
- Change LOGIN Password #I 74
- Change SETUP Password #S 74
- Callback Time Delay (S15) 75
- Callback Attempts (S16) 75
- Local Inactivity Timer (S29) 75
- 8.1 Introduction 77
- 8.3 Speaker Volume Control 83
- DIP-Switches 84
- DIP Switches #13-14 85
- 9.1 Introduction 87
- 9.5 Technical Support 89
- 9.6 Internet Sites 89
- 9.4 Replacement Parts 89
- Appendixes 90
- Upgrade Overview 91
- Appendix B - Troubleshooting 94
- I Am Losing Data 97
- *Factory Default 100
- Password Command Summary 106
- V.25bis Commands 106
- Delayed and Forbidden Numbers 107
- V.25bis Operation 107
- V.25bis Mode AT Commands 108
- V.25bis AT Commands 109
- DTR Dialing ($D) Command 110
- 25-PIN DTE 113
- Connector 113
- 25-PIN DCE 113
- FCC Part 68 Telecom 114
- Canadian Limitations Notice 115
- South African Notice 116
- Appendix G – WEEE 117
- Statement 117
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