Campbell Scientific CR800 and CR850 Measurement and Control Systems User Manual
Page 14
Table of Contents
14
8.4 Telecommunications and Data Retrieval............................................... 332
8.4.1 Hardware and Carrier Signal ....................................................... 333
8.4.2 Protocols ...................................................................................... 333
8.4.3 Initiating Telecommunications (Callback)................................... 333
8.5 PakBus Overview.................................................................................. 334
8.5.1 PakBus Addresses........................................................................ 335
8.5.2 Nodes: Leaf Nodes and Routers .................................................. 335
8.5.2.1 Router and Leaf-Node Configuration................................. 335
8.5.3 Linking PakBus Nodes: Neighbor Discovery.............................. 337
8.5.3.1 Hello-message (two-way exchange) .................................. 337
8.5.3.2 Beacon (one-way broadcast) .............................................. 337
8.5.3.3 Hello-request (one-way broadcast) .................................... 338
8.5.3.4 Neighbor Lists.................................................................... 338
8.5.3.5 Adjusting Links.................................................................. 338
8.5.3.6 Maintaining Links .............................................................. 338
8.5.4 PakBus Troubleshooting.............................................................. 339
8.5.4.1 Link Integrity ..................................................................... 339
8.5.4.1.1 Automatic Packet-Size Adjustment .......................... 339
8.5.4.2 Ping .................................................................................... 339
8.5.4.3 Traffic Flow ....................................................................... 340
8.5.5 LoggerNet Network-Map Configuration ..................................... 340
8.5.6 PakBus LAN Example................................................................. 341
8.5.6.1 LAN Wiring ....................................................................... 341
8.5.6.2 LAN Setup ......................................................................... 342
8.5.6.3 LoggerNet Setup ................................................................ 344
8.5.7 PakBus Encryption ...................................................................... 346
8.6 Alternate Telecommunications.............................................................. 347
8.6.1 DNP3 ........................................................................................... 347
8.6.1.1 Overview............................................................................ 347
8.6.1.2 Programming for DNP3 ..................................................... 347
8.6.1.2.1 Declarations.............................................................. 347
8.6.1.2.2 CRBasic Instructions ................................................ 348
8.6.1.2.3 Programming for Data-Acquisition .......................... 349
8.6.2 Modbus ........................................................................................ 350
8.6.2.1 Overview............................................................................ 350
8.6.2.2 Terminology....................................................................... 351
8.6.2.2.1 Glossary of Terms .................................................... 351
8.6.2.3 Programming for Modbus .................................................. 352
8.6.2.3.1 Declarations.............................................................. 352
8.6.2.3.2 CRBasic Instructions - Modbus................................ 352
8.6.2.3.3 Addressing (ModbusAddr) ....................................... 353
8.6.2.3.4 Supported Function Codes (Function)...................... 353
8.6.2.3.5 Reading Inverse-Format Registers............................ 353
8.6.2.4 Troubleshooting ................................................................. 353
8.6.2.5 Modbus over IP.................................................................. 354
8.6.2.6 Modbus tidBytes ................................................................ 354
8.6.2.7 Converting 16-bit to 32-bit Longs...................................... 354
8.6.3 Web Service API ......................................................................... 355
8.6.3.1 Authentication.................................................................... 355
8.6.3.2 Command Syntax............................................................... 356
8.6.3.3 Time Syntax ....................................................................... 358
8.6.3.4 Data Management .............................................................. 358
8.6.3.4.1 BrowseSymbols Command ...................................... 358
8.6.3.4.2 DataQuery Command ............................................... 362
8.6.3.5 Control ............................................................................... 368
8.6.3.5.1 SetValueEx Command ............................................. 368