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82
Chapter 8 - Dip-Switch Settings
Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide
Switch #11
Internal/External Clocking
(Synchronous Mode/Leased Line/Dial-Up)
In Synchronous mode, the transmit clock can be supplied by the DTE on pin 24 of the RS-232C/V.24
interface by placing DIP-Switch #11 UP. Place DIP-Switch #11 in the DOWN position to enable DCE
to control clocking (internal clock via pins 15 and 17 of the RS-232/V.24 interface).
External Clock (pin 24) = Switch #11 UP
Internal Clock (pins 15/17) = Switch #11 DOWN
Factory Default Setting = DOWN
Switch #12
Asynchronous/Synchronous Operation -- "Sync"
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)
The modem can operate in either Asynchronous mode or Synchronous mode. This switch is a means
to alternate and to access either mode. In Synchronous mode, start and stop bits are eliminated and
the modem’s Command mode is not accessible. The modem's internal clock circuits (on the RS-
232C/V.24 pins 15 and 17) are activated. In Synchronous mode, you may want to set the RTS
forcing and CTS forcing DIP-Switches so that both of signals act normally (not forced on).
Synchronous Operation = Switch #12 UP
Asynchronous Operation = Switch #12 DOWN
Factory Default Setting = DOWN
Switches #13 and #14
Speed Switches
(Synchronous Mode/Leased Line)
DIP-Switches #13 and #14 are used to set the modem’s data transmission rate. Switches #13 and
#14 are used in combination, typically in leased-line and call origination applications.
Note: The modem baud rate command ($MBn) overrides the setting of these speed selection
switches (DIP switches #13 and #14).
28800 bps Operation = Switch #13 UP and Switch #14 UP
19200 bps Operation = Switch #13 DN and Switch #14 UP
14400 bps Operation = Switch #13 UP and Switch #14 DN
9600 bps Operation = Switch #13 DN and Switch #14 DN
Factory Default Setting = Switch #13 UP and Switch #14 UP
Switch #15
Carrier Detect/DSR Forcing -- "DSR"
(Asynchronous/Synchronous Mode/Dial-Up/Leased Line)
Some terminals react in unusual ways to the toggling of the Carrier Detect (CD - RS-232C/V.24 pin
6) signals. The most common symptom is that the modem does not respond to commands, or does
not echo characters. In these cases, it is advisable to force these two signals On in order for the
terminal to communicate properly with the modem in Command mode. This is done by setting DIP-
Switch #15 DOWN. With DIP-Switch #15 in the UP position, both CD and DSR will be either on or off,
depending on the On-Line status.
CD and DSR normal = Switch #15 UP
CD and DSR forced On = Switch #15 DOWN
Factory Default Setting = UP
- 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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