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AT Commands and S-Registers
4-113821-A2-GB20-40 January 1999
Table 4-1
(9 of 13)
3821
Plus
AT Commands
&S
n
– DSR Control
Data Set Ready (DSR) is a signal from the modem to the DTE indicating the modem is connected and ready for
operation.
&S, &S0 Forced On. Forces DSR output ON constantly. This is usually used for leased-line applications and
when the DTE requires DSR to always be ON.
&S1 Standard RS232. Modem controls DSR to the DTE. The modem raises DSR when it begins the
handshake process. DSR lowers upon disconnect. The modem is not ready to receive data until
DSR, CTS, and LSD are active.
&S2 Wink When Disconnect. DSR is normally forced ON, but is turned Off for 1 to 2 seconds upon a
disconnect.
&S3 Follows DTR. When the modem receives DTR from the DTE, it sends DSR to the DTE.
&S4 On Early. DSR is low when the modem is in the idle state. DSR goes high immediately upon a
command to enter Data mode. This setting is required for some modem pooling applications.
&S5 Delay to Data. Operation is similar to the Standard RS232 setting except that DSR does not turn
ON until the modem enters Data mode. Normally, the modem raises DSR when it begins the
handshaking process.
&T
n
– Tests
&T, &T0 Abort. Stops any test in progress.
&T1 Local Analog Loopback. The modem must be in Direct mode.
&T2 Pattern. Transmits and receives a 511 Bit Error Rate Test (BERT). The modem must be online and in
Direct mode.
&T3 Local Digital Loopback test. The modem must be online and in Direct mode.
&T4 Enables Receive Remote Loopback Response configuration option.
&T5 Disables Receive Remote Loopback Response configuration option.
&T6 Remote Digital Loopback test. The modem must be online and in Direct mode.
&T7 Remote Digital Loopback with Pattern. The modem must be online and in Direct mode.
&T8 Local Loopback with Pattern. The modem must be in Direct mode.
&T9 Self-Test.
To start a test, set the S18 register to a desired test duration in seconds (for example, 30 seconds), and then issue the
&T
n
command. Test results are displayed as the number of errors sent or received over the number of blocks sent or
received.
&V
n
– View Configuration Options
Displays each configuration group within the Active (Operating), Active (Saved), Customer 1, and Customer 2
configuration areas as well as the telephone numbers stores in directory locations 1–10.
&V, &V0 Active (Operating) configuration options.
&V1 Active (Saved) configuration options.
&V2 Customer 1 configuration options.
&V3 Customer 2 configuration options.
&V4 Directory locations 1–10.
&V5 Status of VF line characteristics.
&W
n
– Write (Save to Memory)
Saves the current configuration options in Active (Operating) to one of three configuration areas:
&W, &W0 Saved to Active (Saved).
&W1 Saved to Customer 1.
&W2 Saved to Customer 2.
- COMSPHERE 1
- Important Safety Instructions 3
- United States 5
- United Kingdom 6
- Ringer Equivalence Number 6
- Connection to Leased Lines 6
- All European Countries 7
- Safety Notice 7
- Restrictions 7
- Table of Contents 9
- COMSPHERE 3821Plus Modem 10
- Table of Contents 11
- Objectives and Reader 13
- Assumptions 13
- How to Use This Manual 13
- Related Documents 14
- Introduction 15
- Status Indicators 16
- Table 1-1 17
- Color Indicates 17
- SDCP Operation 18
- Modem Installation 19
- 495-14797 22
- Front Panel 22
- 495-14800 22
- 496-14801-01 23
- 495-14829 24
- SDCP Menus 27
- Menu Structure 28
- Modem Status Messages 29
- SDCP Menus 31
- Modem Select Branch 33
- Quick Configuration Display 33
- Call Setup Branch 35
- Change Directory 36
- Entering Telephone Numbers 36
- Status Branch 37
- Identity 38
- 494-14855 39
- Local Digital Loop 40
- Remote Digital Loop 40
- Configure Branch 41
- Configure 42
- DTE Interface 44
- Table 3-4 45
- (1 of 6) 45
- (2 of 6) 46
- (3 of 6) 47
- (4 of 6) 48
- (5 of 6) 49
- (6 of 6) 50
- DTE Dialer 51
- Table 3-5 52
- Line Dialer 56
- Table 3-6 57
- (2 of 4) 57
- (3 of 4) 58
- (4 of 4) 59
- Dial Line 60
- Table 3-7 61
- Leased Line 63
- Table 3-8 64
- V.42/MNP/Buffer 65
- Table 3-9 66
- Table 3-11 72
- Control Branch 73
- Clone To Remote 74
- To Local via DTE 74
- Remote Branch 75
- This page intentionally left 76
- AT Commands and S-Registers 77
- Command Guidelines 78
- AT Command List 78
- ATDT9,5551234 79
- Table 4-1 80
- (2 of 13) 80
- AT Commands 80
- (3 of 13) 81
- (4 of 13) 82
- (5 of 13) 83
- (6 of 13) 84
- D D 85
- (9 of 13) 87
- (10 of 13) 88
- (11 of 13) 89
- (12 of 13) 90
- (13 of 13) 91
- S-Register List 92
- (2 of 10) 93
- (3 of 10) 94
- (4 of 10) 95
- (5 of 10) 96
- (6 of 10) 97
- (7 of 10) 98
- (8 of 10) 99
- Table 4-2 100
- (9 of 10) 100
- S-Registers 100
- (10 of 10) 101
- Recovering AT Commands 102
- Initialization Strings 103
- Fax Operation 105
- Remote Access 107
- 495-13082a-02 108
- Security 109
- Originate Security 110
- Answer Security 110
- Callback Security 111
- Security Branch 111
- EditPassWdTable 112
- Select Index 112
- Table 7-1 113
- (2 of 2) 113
- Set Answer Sec 114
- Set Orig Secur 115
- Set CallBack Sec 115
- " Procedure 116
- Security Configuration 117
- Table 7-5 118
- (2 of 3) 118
- (3 of 3) 119
- SDCP Menu Tree 121
- 98-14848-01 122
- 98-14849-01 123
- 495-14850 124
- Result Codes 125
- Table B-1 126
- Troubleshooting 129
- Table C-5 131
- (1 of 2) 131
- Modem – VF Connection 131
- Automatic Firmware 133
- Download 133
- Technical Specifications 135
- Table D-1 136
- Model 3821 136
- Technical Specifications 136
- Specifications Description 136
- Pin Assignments 137
- JM8 to RJ11 Crossover Cable 138
- NIM Cable Pin Assignments 139
- Overview 141
- Call Request Commands 142
- Call Response 142
- Call Connecting (CNX) 143
- Incoming Call (INC) 143
- Disregard Incoming Call (DIC) 143
- Connect Incoming Call (CIC) 143
- Command Response 144
- Equipment List 147
- Configuration Options by 149
- Country Code 149
- Table H-1 150
- (1 of 5) 150
- (2 of 5) 151
- (3 of 5) 152
- (4 of 5) 153
- (5 of 5) 154
- Table H-2 155
- Glossary 161
- Glossary 163
- 00282600 175
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