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10 Using the OpenLDV API
Introduction to OpenLDV Programming
An application that uses the OpenLDV API is called an OpenLDV application.
The communications protocol used for OpenLDV applications is the ISO/IEC
14908-1 (ANSI/CEA 709.1-B and EN14908.1) Control Network Protocol. This
protocol is an international standard seven-layer protocol that has been
optimized for control applications, and is based on the Open Systems
Interconnection (OSI) Basic Reference Model (the OSI Model, ISO standard 7498-
1). The OSI Model describes computer network communications through the
seven abstract layers described in Table 2. The implementation of these layers
in a L
ONWORKS device provides standardized interconnectivity for devices within
a L
ONWORKS network.
Table 2. L
ONWORKS Network Protocol Layers
OSI Layer Purpose Services Provided
7 Application Application compatibility Network configuration, self-installation,
network diagnostics, file transfer,
application configuration, application
specification, alarms, data logging,
scheduling
6 Presentation Data interpretation Network variables, application messages,
foreign frame transmission
5 Session Control Request/response, authentication
4 Transport End-to-end
communication reliability
Acknowledged and unacknowledged
message delivery, common ordering,
duplicate detection
3 Network Destination addressing Unicast and multicast addressing,
routers
2 Data Link Media access and framing Framing, data encoding, CRC error
checking, predictive carrier sense
multiple access (CSMA), collision
avoidance, priority, collision detection
1 Physical Electrical interconnect Media-specific interfaces and modulation
schemes
Echelon’s implementation of the ISO/IEC 14908 Control Network Protocol is
called the LonTalk protocol. Echelon has implementations of the LonTalk
protocol in several product offerings, including the Neuron firmware, LNS
Server, SmartServers, and various network interfaces. This document refers to
the ISO/IEC 14908-1 Control Network Protocol as the “LonTalk protocol”,
although other interoperable implementations exist.
An OpenLDV application can work with Layer 2 network interfaces, Layer 5
network interfaces, or LonScanner Protocol Analyzer interfaces. Figure 3 shows
- OpenLDV 1
- Programmer’s Guide 1
- Welcome 3
- Audience 3
- Examples 4
- Related Documentation 4
- Table of Contents 5
- Introduction 9
- ONWORKS network: 10
- OpenLDV Driver 11
- Client Applications 11
- Network Interfaces 12
- Installing the OpenLDV SDK 14
- Using the OpenLDV API 17
- ONWORKS network 18
- Application Layer 20
- Presentation Layer 21
- Overview of the OpenLDV API 21
- The OpenLDV API 23
- ONWORKS interface device 24
- ONWORKS name (such as 24
- LDVDevices Structure 46
- LdvCombineFlags Enumeration 47
- LdvDeviceCaps Enumeration 48
- LDVDriverInfo Structure 50
- LdvDriverID Enumeration 51
- LdvDriverType Enumeration 52
- OpenLDV API Return Codes 53
- ONWORKS Interfaces 57
- msgSize); 62
- Constructing Messages 66
- Application Buffer Structure 66
- Layer 2 Buffer Structure 69
- Application Layer Header 69
- Layer 2 Header 69
- Layer 5 Buffer Structure 70
- Message Header 70
- ExpMsgHdr 71
- NetVarHdr 73
- ONWORKS transceivers 74
- Network Address 75
- RcvAddrDtl 78
- RespAddrDtl 80
- Message Data 81
- UnprocessedNV 82
- ExplicitMsg 82
- Downlink Commands 84
- Uplink Commands 85
- Immediate Commands 85
- Network Interface Commands 85
- Common Definitions 98
- Dispatchers 98
- Toolkits and User Interface 99
- Developer Example Diagram 100
- ONWORKS 101
- LNS Applications for xDriver 106
- Extending xDriver 107
- Downlink Sessions 108
- 102 Extending xDriver 110
- Typical Downlink Scenario 111
- Uplink Sessions 112
- ONWORKS network, in a 114
- Typical Uplink Scenario 115
- Session Control Object 116
- Authentication Key Handling 119
- ONWORKS \xDriver\Components 123
- Add a COM Object 124
- Test the Lookup Extension 132
- Optional Steps 132
- Add a COM Class 135
- LNS Programming with xDriver 145
- ONWORKS networks 147
- ONWORKS networks by 148
- Uplink Sample Application 150
- Custom Network Interfaces 155
- Overview 156
- Windows Registry Entries 158
- LNS Methods and Events for 161
- AcceptIncomingSession 162
- Remarks 162
- BeginIncomingSessionEvents 163
- EndIncomingSessionEvents 163
- NetworkInterfaces.Item( ) 164
- Syntax 164
- OnIncomingSessionEvent 165
- ReleasePendingUpdates 166
- Custom Lookup Extension 169
- Component Programming 169
- ILdvxConfigure Interface 170
- SetInstance Method 170
- Returns 171
- SetOptions Method 171
- ILdvxLookup Interface 172
- DownlinkLookup Method 172
- UpdateLookup Method 173
- UplinkLookup Method 173
- ILdvxSCO Interface 174
- GetDownlinkKey Method 177
- GetUplinkKey Method 180
- SetAuthenticationFlag Method 181
- SetDownlinkKey Method 183
- SetEncryptionType Method 183
- SetLNSNetworkName Method 184
- SetUplinkKey Method 186
- ILdvxSCO_TCP Interface 186
- GetRemoteTCPAddress Method 187
- GetRemoteTCPPort Method 187
- SetRemoteTCPAddress Method 188
- SetRemoteTCPPort Method 188
- ILdvxSCO2 Interface 189
- GetNeuronID Method 189
- 184 Index 192
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