Local DTE/DCE Interface, Modes | Sierra Wireless DART 300 specs

Feature Reference

4.Local DTE/DCE Interface

This section covers:

•Important terminology on modem modes and states

•Modem buffers

•The AT Command Interface

•The RS-232C control signals

A sound understanding of the interface is important to smooth communication with devices that may not handle the modem’s AT commands and responses as well as intelligent local hosts that can exercise full control of the modem.

4.1. Modem Modes and States

The DART 300 modem supports CDPD only but with several packet service modes. Various states and conditions within each mode are also possible. The commands and registers used depend on the modem’s operating mode, state of the modem, and its condition. Together these determine how the modem will behave in any given situation.

Mode	indicates the packet service or local connection used by the modem.
State	indicates whether data is treated as a modem command or data for transmission.
Condition	indicates whether the modem has an active connection to the network.

4.1.1.Modes

The DART 300 supports all of these modes.

•SLIP – The simplest mode of operation, where the local host system provides TCP or UDP stack services. This is the factory default.

•PPP – A more robust form of SLIP connection where the local host again provides the protocol stack. This protocol allows the local host and modem to negotiate the features they have in common to establish the most effective communication.

•UDP – User Datagram Protocol stack is implemented in the modem where serial data is assembled into packets, or received data packets are disassembled for the local host.

•TCP – Transport Control Protocol stack is implemented in the modem for packet assembly and disassembly and the management of connection handshaking with the remote.

UDP and TCP modes are also known as PAD modes because the modem’s internal Packet Assembler / Disassembler (PAD) services are active.

The mode can be changed whenever the modem does not have an open session. A full discussion of the protocols is covered in Section 6.

2110212 Rev 1.0

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Sierra Wireless DART 300 manual Local DTE/DCE Interface, Modem Modes and States

Contents

Sierra Wireless Dart 300 Cdpd Modem 2110212 Rev November Safety and Hazards Important NoticePatents Copyright Regulatory Information RSA Licensee Contact Information Dart 300 Modem User’s Guide 2110212 Rev Contents Introduction Feature Reference Cdpd Network Registration Protocols and Packet Assembly Features Transmission Control Protocol TCP Configuration and Use Intstallation Installation Considerations AT Commands and Status RegistersReferences 119 Specifications 123 How to Proceed About this GuideIntroduction Focus List Book 2 Feature Reference Book 3 Configuration and UseDocument Structure Introduction Dart 300 Modem Dart 300 Checklist Book 4 InstallationUser’s Guide About This Guide Book 5 References References CurrencyConventions Used in this Reference Dart 300 / SB300 Dart Introduction Dart 300 Modem 2110212 Rev System Overview Typical System View Field Network Connection Project Stages Central MonitorClient / Server Stage 1 Application Planning Stage 3 Field Installation and Testing Stage 2 Bench Integration and TestingStage 4 Rollout Service Activation Getting Started Power Supply Set-up ConsiderationsAntenna Serial Cable Connections Cdpd ConfigurationUser’s Guide Getting Started Cdpd Network Registration Verifying Network Registration Ping Obtaining a Ping from the Modem Modem Modes and States Local DTE/DCE InterfaceModes Command to Data State StatesConditions Sessions User’s Guide Local DTE/DCE Interface Data to Command StateDetails Command Buffer Modem BuffersData Buffers Speed Buffering AT Command Handling and Defaults General NotesParameters Responses and Results Returned by the Modem Framing Characters FramingResponses For Commands without a Response Result CodesResponse Framing Echo Verbose Quiet Result Framing No Response Echo Verbose Quiet For Commands with a Response RegistersPossible Result Codes Result Framing After Response Echo Verbose Quiet RS-232C Interface and Control Signals Interface SettingsFixed Rate Setting +IPR Flow Control DTR Flow Control Control SignalsData Terminal Ready DTR Ring Indicator RI Data Set Ready DSRRequest to Send RTS Clear to Send CTS Data Carrier Detect DCD DCD Product Features Friends Only Dial Directory Implementation User’s Guide Product Features Auto-dial on Start-up Sleep Mode Cdpd Sleep Logic Sleep Logic Deep Sleep Using Ring Indicator RI with Host SleepTo force re-registration now UDP/TCP Cdpd Radio and Booster Support Upgradability Communication Protocols and Stacks Protocols and Packet Assembly FeaturesOSI Model User Datagram Protocol UDP Packet Service ModesDart 300 Internal Protocol Stacks UDP Server Features User’s Guide Protocols and Packet Assembly FeaturesAnswering UDP Server Sessions UDP Server Receive Lock Disabling the UDP Server UDP Client Features Closing UDP Sessions Configuration and Use UDP Broadcast and MulticastBroadcast Multicast TCP Server Features Transmission Control Protocol TCPTCP Handshaking Answering TCP Server Sessions Closing a TCP Session TCP Client FeaturesDisabling the TCP Server Serial Line Interface Protocol Slip TCP and Sleep ModePoint-to-Point Protocol PPP Packet Assembly Management Assembling a PacketForwarding a Packet Local Echo Escaping Data State Time Dependent Escape Sequence Tdes Guard Time Important RelationshipsEscape Character Time Independent Escape Sequence Ties PAD Session Timeout Data and Telemetry ConsiderationsDTR Transition TCP Remote Disconnect User’s Guide Protocols and Packet Assembly Features Feature Reference Dart 300 Modem 2110212 Rev Advanced Features Multiple Cdpd Accounts Channel Acquisition Controlling Network RegistrationChannel Scanning User’s Guide Advanced Features Side PreferenceSpni Matching Assign a Channel Spni Table Configuration Disable Spni MatchingEnable Spni Matching Determining Channel Acquisition Status Registration Active and Auto-register NEI Indices Manual Registration Automatic RegistrationDetermining Registration Status De-registration +WPNEILIST Radio Signal Monitors LED IndicatorMonitoring the Network Connection Registration Mode Registration Status Feature Reference Dart 300 Modem 2110212 Rev Configuration Checklist for UDP/TCP Service UDP/TCP ServiceNEI and Channel Restrictions Service Options Registration and Sleep ModeConfiguration and Use Dart 300 Modem User’s Guide UDP/TCP Service Packet Assembly and Forwarding OptionsEscape Options Using UDP/TCP Service Save ConfigurationServer Sessions Server Initialization Using an Open UDP Session UDP Server SessionsOpening a UDP Server Session Receiving Data TCP Server Sessions Transmitting DataClosing UDP Server Sessions Opening a TCP Server Session Using an Open TCP Session Client Sessions Closing TCP Server SessionsNo Carrier result UDP Client Connection By +WS198 TCP Client Connection Using a Client Session Closing a Client Session Sample UDP/TCP Configurations Case 1 Semi-intelligent RTUCabling DCE male Modem Configuration Protocol Considerations Case 2 Dumb Meter+IPR=9600 Sample Configuration Meter Command Remarks +WPNEI= ip +WS179=0+WS212=0 +WS213=1 Using This Configuration Configuration and Use Dart 300 Modem 2110212 Rev SLIP/PPP Service Configuring Slip Service Configuration and Use Dart 300 Modem Using Slip Service TransmittingReceiving Escaping Data State Configuring PPP Service Using DTR to EscapePoint to Point Protocol PPP Closing a Slip Session User’s Guide SLIP/PPP Service Using PPP Service Closing a PPP Session User’s Guide SLIP/PPP Service Configuration and Use Dart 300 Modem 2110212 Rev Device Attachment Antenna Connection Watt Class I Booster Operation Installation Dart 300 ModemConnection Serial Connector Pin Signal DirectionNull-Modem Connection User’s Guide Device Attachment DCE modem Cable LengthDCE host Power Connection Installation Dart 300 Modem 2110212 Rev Installation Considerations Temperature and Auto ShutdownTemperature vs. Duty Cycle Minutes Time Ambient Temperature C Access Power SupplyWire Splicing Grounding Crimp Terminals MountingUser’s Guide Considerations Installation Dart 300 Modem 2110212 Rev AT Commands and Status Registers AT Command Set1AT Commands in Cdpd Mode Command Description AT+++ References Dart 300 Modem AT Commands in Cdpd Mode Command Description 0xC0Result Codes AT Commands in Cdpd Mode Description Options User’s Guide AT Command ReferenceOptions AT Commands in Cdpd Mode Quiet Result Code Display Option Framing of responses. See .3.3 for detailsSn=x Sn? AT Commands in Cdpd Mode Command Description AT & Commands in Cdpd Mode Description AT + Commands in Cdpd Mode Command Description +IPR=n AT + Commands in Cdpd Mode Command Description Change c.c.c.c to n.n.n.n? +WPSPNI= n,n,...n +WSn? Change c.c.c.c.q to n.n.n.n.p? Registers in Cdpd Mode S-Registers in Cdpd Mode Description Range Default UnitsCdpd Status Registers Auto-answer Off DisabledWord WS-Registers in Cdpd Mode WS-Registers in Cdpd Mode Description Range Default UnitsPAD Packet Service DTE side stack Logic Sleep References Dart 300 Modem PAD Inter-Character Timer 174 175 User’s Guide AT Command Reference 209 201210 216 217 +WS197, also setting +WS176=+WS197 Result Codes in Cdpd Mode Verbose MeaningImportant Notes and Dependencies Result Codes Stored Profile Settings for Cdpd Mode References Dart 300 Modem 2110212 Rev General Communication Problems TroubleshootingProblem Description Suggestions Error # General Modem ProblemsReferencesDART 300 Modem Cdpd Network / Connectivity Problems WarrantyWarranty Registration User’s Guide Troubleshooting Obtaining Service Specifications Power SpecificationsRadio Specifications Power Connector Antenna Specifications Antenna SpecificationsRegulatory Approvals FCC Environmental Specifications Application Interface SpecificationsUser’s GuideSpecifications Environmental Specifications