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OpenLDV Programmer’s Guide 63
• NetVarHdr — for sending and receiving network variables that are
processed by the network interface
ExpMsgHdr
7 6 5 4 3 2 1 0
msgtype
service type auth tag
Priority Path
compl
code
addr
mode
alt path pool resp
length
msgtype
The msgtype field is set to 0 for the ExpMsgHdr.
service type
The service type field contains one of the following values, depending on
which LonTalk protocol messaging service is to be used for delivery of the
message:
• ACKD (0) for the acknowledged messaging service
• UNACKD_RPT (1) for the repeated messaged service
• UNACKD (2) for the unacknowledged messaging service
• REQUEST (3) for the request/response messaging service
auth
The auth field is set to 1 for a downlink message (sent to a network interface)
if the receiver must authenticate the message using LonTalk authentication.
A network interfaces might require authentication for local network
management commands.
It is set to 1 for an uplink message (read from a network interface) if the
message has been authenticated by the network interface.
If authentication is not enabled on the network interface, this field should be
set to 0.
tag
The OpenLDV application uses the tag field for a downlink message (sent to a
network interface) to correlate returned responses and completion events.
For explicitly addressed messages (those that use the full 3-layer address),
you can segt the tag to any value in the range 0-14, and the same value is
returned with the corresponding responses and completion events. In this
case, the tag is also known as the reference ID. For a downlink implicitly
addressed message (one that specifies an entry in the address table), the tag
field is used as an index into the address table of the Smart Transceiver or
Neuron Chip in the network interface to indicate the destination address of
the message. For more information about the address table, see the ISO/IEC
14908-1 protocol specification.
- 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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