Multitech MT3334HD8 Guide de l'utilisateur Page 27
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3 AT Commands
CommPlete Communications Server 21
&Fn Load Default Configuration
n
= 0, 8, or 9
Default: &F8
MT3334HD8 modems store factory default AT command settings and S-register values in read-only
memory (ROM); they store your custom AT command and S-register values in nonvolatile random access
memory (NVRAM).
The &F0 (or &F) command resets the modem to the factory default values stored in ROM or to your
custom values stored in NVRAM, depending on whether you last stored an &F8 or an &F9 command.
When &F8 is stored and an &F command is issued, the modem reads the factory default settings stored in
ROM.
When &F9 is stored and an &F command is issued, the &W setting determines whether the modem reads
settings stored in NVRAM or ROM. If the modem is set to &W0, it reads your custom settings stored in
NVRAM. If the modem is set to &W1, it erases your stored settings (including the &F9 command) and
reads the factory default settings stored in ROM. Many communications programs issue the &F command
automatically—the &F9 command allows you to select your own defaults.
Note that for either an &F8 or an &F9 command to be effective after a reset it must be stored using the
&W0 command.
Table 2 summarizes how the &F and Z reset commands interact with the &W command; note that the &F
reset command operates differently from the Z reset command:
Table 2. Where the Modem Reads Configuration Parameters
Previous Command AT&F Power-On and ATZ
AT&W1 (default) ROM ROM
AT&W0 ROM NVRAM
AT&F8&W0 ROM NVRAM
AT&F9&W0 NVRAM NVRAM
Z Reset Modem
The Z command resets the modem to its default configuration and clears the command buffer. The result
is the same as turning the modem off and on. When you type ATZ, the state of the &W command
determines where the default values originate. &W0 defaults come from the customized configuration in
NVRAM, and &W1 defaults come from the factory default configuration in ROM. Because Z clears the
command buffer, it must be the last command in a command string; normally it is issued by itself: ATZ.
Note that the Z reset command operates differently from the &F reset command. See Table 2 on page 21.
Modem Response (Result Code) Commands
The MT3334HD8’s modems can give responses to commands. The most common one is
OK
, but the
modems also can alert you or your software to dial tones, busy signals, connection speeds, and whether the
connection is made with error correction or compression enabled. These responses are called
result codes
,
and they can be terse or verbose, Multi-Tech or standard, basic or extended.
- MT3334HD8 Modem 1
- User Guide 1
- FCC Fax Warning 4
- Canadian Limitations Notice 4
- Table of Contents 5
- 1 Introduction 7
- LED Indicators 8
- Power Supplies 8
- Manual Organization 8
- Technical Specifications 10
- 980 Hz mark 11
- 390 Hz mark 11
- 2 Installation 13
- Introduction 14
- Safety Warnings 14
- Pre-Installation Notes 15
- Installation Procedure 15
- 3 AT Commands 17
- Working with AT Commands 18
- Command Editing 19
- MT3334HD8 User Guide 20
- 3 AT Commands 21
- Dialing Commands 22
- Dial Modifier Commands 22
- P, T Pulse or Tone Dialing 23
- W Wait for New Dial Tone 23
- , Dialing Pause 24
- : Continuous Redial 24
- ! Flash On-Hook 24
- Phone Number Memory Commands 25
- NdNe Number Linking 26
- &Wn Store Configuration 26
- Z Reset Modem 27
- Online Connection Commands 30
- %DCn AT Command Control 31
- >DTn DTMF Detection 31
- #Fn Fallback Modes 32
- &Gn Guard Tones 32
- *Hn Busy-Out After Disconnect 32
- &Pn Set Pulse-Dial Ratios 32
- $Tn Calling Tone 33
- #Tn Trellis-Coded Modulation 33
- V.34 Commands 34
- RS-232 Interface Commands 35
- &Rn Clear to Send Control 36
- &En Data Compression 37
- $An Auto-Reliable Buffering 38
- Speed Conversion Commands 39
- $MBn Modem Baud Rate 40
- $SBn Serial Port Baud Rate 40
- Immediate Action Commands 41
- Flow Control Commands 42
- Escape Sequences 45
- Remote Configuration Commands 46
- Line Probe Commands 47
- Diagnostic Commands 48
- Un Loopback Test Modes 49
- 4 S-Registers 51
- S-Registers 52
- S4 Line Feed Character 53
- S5 Backspace Character 53
- S6 Wait Time for Dial Tone 53
- S8 Pause Time for Comma 53
- S17 Changing Break Time 54
- S37 DTR Busy-In Time 56
- S43 Force V.34 Connect Speed 56
- S94 Out-of-Service Time 56
- Examples of Assigning Values 57
- Examples of Reading Values 57
- 5 Testing the MT3334HD8 59
- Test procedure 61
- NTER; you 62
- NTER. If you 62
- NTER to hang up 62
- 6 Warranty, Service, and 65
- Technical Support 65
- Limited Warranty 66
- The Multi-Tech BBS 68
- About CompuServe 69
- About the Internet 70
- NTER at the DOS prompt 71
- SC when finished 71
- Appendixes 73
- Dial Pulses 75
- Tone Dial Frequencies 75
- C Result Code Summary 77
- RELIABLE 77
- D S-Register Summary 79
- E AT Command Summary 81
- Basic Procedure 91
- Changing the Passwords 92
- P/N 82063701 100
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