Multi-tech-systems BL-Series Manuel d'utilisateur Page 104
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104
MultiModemBL User Guide
8.8 Digital Loopback Test (Local/Manual) (Synchronous Mode)
This test must be run when you have a data connection with another modem. If a Local Analog
Loopback Test resulted in errors, and this test passes without errors, then the problem exists in your
computer-to-modem connection. In Digital Loopback Test (local/manual) mode, data passed from the
remote modem’s transmit circuit are looped back from the local modem and are received at the
remote modem’s receive circuit (multiple upper case “U” characters in Figure 8-6).
First make certain that you are set up for Synchronous operation by placing DIP-Switch #12 in the
UP position. To initiate the Digital Loopback Test (local/manual), DIP-Switch #9 must be in the UP
position, and the Answer/Originate switch (front of the modem) must be toggled to the UP position.
Once you receive an OK message from your modem (if responses are enabled), the local modem is
placed in Digital Loopback mode.
To exit the Digital Loopback Test (local/manual), toggle the Answ/Orig switch to the Answer position.
UUUUU
UUUUU
Computer or Terminal Local MultiModem
DIP-Switch #9
UP; Answ/Orig
Switch Toggled to
Answ position
when On-line
Remote MultiModem Computer or Terminal
Digital Analog DigitalAnalog
Figure 8-6. Synchronous Mode Digital Loopback Test (local/manual)
- BL-Series 1
- Intelligent Data/Fax Modem 1
- User Guide 1
- Contents 3
- Chapter 5 - Command Mode 4
- Chapter 6 - S-Registers 4
- Chapter 8 - Modem Testing 5
- 1.1 Introduction 8
- 1.2 How To Use This Manual 8
- 1.3 Modem Features 10
- 1.3.1 2834 Series Features 10
- 1.3.2 1932 Series Features 10
- 1.3.3 1432 Series Features 11
- 1.4 Fax Features 11
- 1.5 Technical Specifications 12
- 1.6 Power 16
- 1.7 Modem LED Indicators 16
- 1.8 Controls on PC Board 17
- MADE IN U.S.A 20
- EIA RS232C 22
- 3.1 Introduction 28
- 3.2 Serial Port Limitations 28
- 3.3 Configuring Your Software 29
- 3.4 PC Initialization Strings 30
- 3.4.2 Other Parameters 30
- 3.5 Macintosh Initialization 31
- 3.6.2 Terminal Emulation 31
- 3.6.3 File Transfer Protocols 32
- 3.8 Modem Basics 33
- 3.8.1 Simple Operations 33
- 4.1 Introduction 36
- 4.2 Dialing/On-Line/Answering 36
- 4.6 Dial-Up Operation 38
- 4.7 Manual Call Origination 38
- 4.8 Automatic Answering 39
- 4.9 Manual Answering 39
- 4.10 Handshaking Details 40
- 4.11 Call Termination 40
- 5.1 Introduction 42
- 5.1.1 AT Command Editing 42
- 5.1.2 Functional Modes 43
- 5.2 Summary of AT Commands 44
- 5.3 Result Codes 47
- 5.4 Dialing Commands 49
- 5.4.1 Dialing Action Commands 49
- 5.4.2 Dial Modifier Commands 50
- 1028806127853500$123456789 52
- Quiet Answer @ 52
- Storing Phone Numbers D...N 53
- Number Linking NN 53
- Modem Reset Z 54
- Unix UUCP Spoofing $SP 55
- Auto Speed Detect #A 60
- Carrier Detect Control &C 61
- CTS Control &R 61
- Data Set Ready Control &S 62
- Normal Mode &E0 63
- Auto-Reliable Mode &E1 63
- Reliable Mode &E2 63
- V.42 Mode Select #L 64
- Auto-Reliable Buffering $A 64
- Retransmit Count $R 65
- 5.4.9 Flow Control Commands 66
- Xon/Xoff Pass-Through &E7 67
- Send Xon/Xoff Characters #X 67
- Maximum Block Size &BS 68
- Parity Selection #P 68
- Through and Pacing Commands 69
- Speed Conversion $BA 70
- Modem Baud Rate $MB 70
- Serial Port Baud Rate $SB 72
- Help Screens $H 73
- Inquiry for Product Code I 73
- Listing S-Register Values L6 73
- Off Hook H 74
- BREAK AT<CR> 74
- Force Answer Mode A 75
- 6.1 Introduction 78
- Remote Configuration 87
- 7.1 Introduction 88
- Configuration 89
- Change LOGIN Password #I 93
- Change SETUP Password #S 93
- Callback Time Delay (S15) 95
- Callback Attempts (S16) 95
- Local Inactivity Timer (S29) 95
- 8.1 Introduction 98
- Digital Analog 99
- Digital Analog DigitalAnalog 100
- 8.5 Back-to-Back Test 102
- 8.6 Synchronous Mode Testing 103
- MultiModemBL User Guide 106
- 9.1 Introduction 108
- 9.3 Speaker Volume Control 114
- DIP-Switches 115
- (-9db/0dB)*/(-15db/-10dB) UP 115
- DIP Switches #13-14 116
- DIP Switches #15-16 116
- 10.1 Introduction 118
- 10.2 Limited Warranty 118
- 10.3 Tech Support 119
- 10.4 Service 119
- 10.5 The Multi-Tech BBS 120
- Appendixes 123
- Appendix A - Troubleshooting 124
- I Am Losing Data 128
- Dial Pulses 130
- Tone Dial Frequencies 130
- Appendix D - Command Summary 131
- Password Command Summary 139
- V.25bis Commands 139
- Asynchronous Mode 140
- Synchronous Mode 141
- Delayed and Forbidden Numbers 147
- V.25bis Operation 147
- V.25bis Mode AT Commands 149
- V.25bis AT Commands 150
- DTR Dialing ($D) Command 151
- 25-PIN DTE 154
- Connector 154
- 25-PIN DCE 154
- Test Voltage - Pin 9, XV 158
- Canadian Limitations Notice 164
- Class A Statement 164
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