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DART 200 CDPD Modem User’s Guide 6 Device Attachment
Sierra Wireless, Inc. 6-2
Figure 6-2. Stand-alone RS-232
The problem with this occurs when modems are inserted between the
DTE and a remote device with a DCE interface. The modem expects to
communicate with a DTE interface. Since this is not the case at the
remote end, where the DCE modem is trying to talk to a DCE device, a
communications failure results. The solution for this situation is a null
modem connector. A typical null modem pin out is shown in Table 6-1.
Table 6-1. Typical null modem pinout
Female
DB9
Male
DB9
1 DCD 4
2 RXD 3
3 TXD 2
4 DTR 6 and 1
5 SGD 5
6 DSR 4
7 RTS 8
8 CTS 7
9 --- Open
The null modem adapter corrects the mismatch between the modem and
a terminating device having a DCE interface. The proper location for the
null modem is shown in Figure 6-3.
Figure 6-3. Null modem location
Computer
DTE
Terminal
RS-232
DCE
Computer
DTE
Terminal
RS-232
Modem
Modem
RS-232
DCE
Phone
Line
DCE DCE
Null modem
needed here
- DART 200 CDPD Modem 1
- Sierra Wireless, Inc. ii 2
- Important Notice 3
- Contact Information 3
- Safety and Hazards 3
- Sierra Wireless, Inc. iv 4
- Contents 5
- 2 Installation and Setup 2-1 6
- 3 CDPD Security Features 3-1 6
- 6 Device Attachment 6-1 7
- 8 Application Programming 8-1 7
- Sierra Wireless, Inc. viii 8
- PN1197-00 Revision 1.0 ix 9
- H Problem Sheet H-1 10
- Glossary Glossary-1 10
- Index Index-1 10
- Notes Notes-1 10
- PN1197-00 Revision 1.0 xi 11
- Sierra Wireless, Inc. xii 12
- About This Guide 13
- Related reading 15
- Compliances 16
- Safety information 17
- Sierra Wireless, Inc. xviii 18
- 1 Introduction 19
- New for this version 20
- Migration considerations 20
- CDPD network overview 21
- AT command set summary 22
- PN1197-00 Revision 1.0 1-5 23
- Sierra Wireless, Inc. 1-6 24
- 2 Installation and Setup 25
- Sierra Wireless, Inc. 2-2 26
- Getting started 29
- Basic modem personalization 30
- command, for 31
- AT&W 31
- command to check that 31
- Initial testing 32
- Sierra Wireless, Inc. 2-10 34
- Problem determination 36
- Sierra Wireless, Inc. 2-14 38
- Sierra Wireless, Inc. 2-18 42
- ENTER, the cursor returns 43
- Sierra Wireless, Inc. 2-20 44
- Basic communications 45
- Sierra Wireless, Inc. 2-22 46
- 3 CDPD Security Features 47
- Modem security management 48
- Sierra Wireless, Inc. 3-4 50
- 4 Broadcast and Multicast 51
- Operation 51
- Broadcast 52
- Multicast 52
- Multicast setup 53
- Sierra Wireless, Inc. 4-4 54
- 5 DART Supported Protocols 55
- Sierra Wireless, Inc. 5-2 56
- PN1197-00 Revision 1.0 5-3 57
- for UDP 59
- Sierra Wireless, Inc. 5-8 62
- How the UDP behaves 63
- Sample UDP server setups 65
- DART TCP capabilities 68
- Friends Only mode operation 68
- TCP communication 69
- Setup options 71
- *A (select server type) AT 71
- for TCP 72
- Sample TCP setups 73
- SLIP IP Address overview 78
- Class NEI SLIP Address 79
- provided it is not 81
- Telnet escape commands 84
- Sierra Wireless, Inc. 5-32 86
- 6 Device Attachment 87
- Sierra Wireless, Inc. 6-2 88
- Computer 88
- Terminal 88
- PN1197-00 Revision 1.0 6-3 89
- Sierra Wireless, Inc. 6-4 90
- 7 Vehicle Installation 91
- Considerations 91
- Proximity to other antennas 92
- PN1197-00 Revision 1.0 7-3 93
- Sierra Wireless, Inc. 7-4 94
- 8 Application Programming 95
- Application program structure 96
- Data transfer 97
- Modes of operation 97
- Error recovery 98
- &S0 (always active) 98
- Automatic registration 100
- Registration timer 101
- Manual registration 101
- Auto-Registration at power-on 101
- Data forwarding 102
- PN1197-00 Revision 1.0 8-9 103
- Sierra Wireless, Inc. 8-10 104
- Auto answer setup 105
- Flow control considerations 106
- PN1197-00 Revision 1.0 8-13 107
- PAD operating mode 108
- Data and control interface 109
- Binary data transfer 110
- Parity considerations 111
- PAD keep-alive considerations 112
- PN1197-00 Revision 1.0 8-19 113
- Command response options 114
- Echo option selection 115
- Baud considerations 116
- PN1197-00 Revision 1.0 8-23 117
- Modem dial directory 118
- Messages and response codes 119
- Sierra Wireless, Inc. 8-26 120
- A Limited Warranty and 121
- Sierra Wireless, Inc. A-28 122
- B Product Specifications 123
- Sierra Wireless, Inc. B-2 124
- C Charts and Diagrams 125
- Sierra Wireless, Inc. C-2 126
- D SLIP Setup Examples 127
- Sierra Wireless, Inc. D-2 128
- Windows 95 129
- Sierra Wireless, Inc. D-4 130
- E S-Registers 131
- Sierra Wireless, Inc. E-2 132
- Register definitions 133
- PN1197-00 Revision 1.0 E-5 135
- • Value Baud: 135
- • Stop Bits: 135
- • Data Bits: 135
- PN1197-00 Revision 1.0 E-9 139
- Sierra Wireless, Inc. E-10 140
- PN1197-00 Revision 1.0 E-11 141
- PN1197-00 Revision 1.0 E-13 143
- Sierra Wireless, Inc. E-14 144
- F DART AT Command Set 145
- A/ Repeat 146
- A Answer Online 146
- D (cont.) 147
- E Command Mode Echo 149
- F Online Mode Echo 149
- H Hang-up (close connection) 149
- I Identify 149
- Q Quiet Mode 150
- V Verbose Result Codes 151
- Z Soft Reset 152
- &C Set DCD Operation 153
- &D Set DTR Operation 153
- &S Set DSR Operation 155
- &W Save Active Profile 156
- \J Restrict Channel Selection 157
- \J (cont.) 158
- \M Manual Transmit Control 158
- \N Set Side Preference 158
- \Q Set Flow Control Operation 160
- \S Set Subscriber Identity 161
- \T Automatic Transmit Control 162
- *A Select Server Type 162
- *K TCP PAD Keep-Alive 164
- *L Set Listen Port 165
- *P Ping Remote Host 166
- *R Automatic SLIP Mode 166
- *T Telnet Keep- Alive 167
- Service provider commands 168
- PN1197-00 Revision 1.0 F-25 169
- ^F Force PIN Usage 171
- ^S Set DART SLIP Address 173
- -L Lock on a Specific Channel 174
- G Loading DART 200 177
- Firmware 177
- Sierra Wireless, Inc. G-2 178
- H Problem Sheet 179
- Sierra Wireless, Inc. H-2 180
- Glossary 181
- A (cont.) 193
- C (cont.) 195
- M (cont.) 198
- S (cont.) 199
- T (cont.) 200
- W, X, Y, Z 201
- PN1197-00 Revision 1.0 203
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