snap ethernet-based i/o units protocols and programming guide

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CHAPTER 3: USING THE SNAP ETHERNET I/O DRIVER TOOLKIT OnStreamEvent long nIPAddress long nStatus ActiveX Event Description 78 SNAP Ethernet-Based I/O Units Protocols and Programming Guide This event is called whenever a stream packet is received or an error occurs. The nIPAddress parameter contains the IP address of the brain that this event concerns. The nStatus parameter contains a status code from the Return Values table on page 61. Possible values are: SIOMM_OK (0): means that the stream packet is good and should be retrieved with one of the methods above. SIOMM_TIME_OUT (-2): means that a stream packet has not been received within the amount of time specified in the StartStreamListening() method. This is not necessarily a serious problem. Depending upon the application, it can perhaps ignore this event and continue waiting for the next packet.
CHAPTER 4 Chapter 4 Using the IEEE 1394-based Protocol Memory Mapping This chapter shows you how to use Opto 22’s IEEE 1394-based memory map protocol to write your own applications for direct communication between a PC and a SNAP Ethernet-based I/O unit, for example, if you are writing your own driver. (Information on the Opto 22 SNAP Ethernet I/O Driver Toolkit, which makes programming easier for Microsoft Windows users, is in Chapter 3.) This chapter assumes the following: Your Ethernet network—including a PC, hubs if needed, and one or more SNAP Ethernet-based I/O units—is already installed. (For help installing and troubleshooting your SNAP Ethernet-based I/O units, see Opto 22 form #1460, the SNAP Ethernet-based I/O Units User’s Guide.) Unique, appropriate IP addresses have been assigned to the brains. Each SNAP Ethernet-based brain can be reached by the host PC using the PING program. This chapter also assumes that you are familiar with programming, TCP/IP or UDP/IP, and Ethernet networking. If you are not familiar with these subjects, we strongly suggest you consult commercially available resources to learn about them before attempting to program applications for SNAP Ethernet-based brains. The complete SNAP Ethernet-based brain memory map is in Appendix A, starting on page 103. This memory map covers all possible addresses; some may not apply to the brain model you are using. For detailed information on brain models and features, see “SNAP Ethernet-Based Brain Comparison Chart” on page 6. The SNAP Ethernet-based brain uses the IEEE 1394 specification to provide a standard for reading and writing data. You do not need to read the specification in order to use the protocol, however. IEEE 1394 specifies a memory-mapped model for devices on a serial network. For asynchronous transfers, it also specifies a request-response protocol for read/write operations. Basically, each SNAP Ethernet-Based I/O Units Protocols and Programming Guide 79
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SNAP ETHERNET-BASED I/O UNITS PROTO
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Table of Contents Chapter 1: Introd
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Non-velocity Algorithms............
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Disconnecting......................
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Data Logging Configuration—Read/W
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Chapter 1 Introduction CHAPTER 1 We
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About this Guide CHAPTER 1: INTRODU
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For Help CHAPTER 1: INTRODUCTION If
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FEATURE CHAPTER 1: INTRODUCTION Ema
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CHAPTER 1: INTRODUCTION This task C
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CHAPTER 2 Chapter 2 Overview of Pro
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Referencing SNAP I/O Points CHAPTER
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Analog and Digital Systems (N Brain
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Digital-Only Systems The following
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I/O Point Types CHAPTER 2: OVERVIEW
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CHAPTER 2: OVERVIEW OF PROGRAMMING
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Watchdog (Digital and Analog Points
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CHAPTER 2: OVERVIEW OF PROGRAMMING
Page 37 and 38: CHAPTER 2: OVERVIEW OF PROGRAMMING
Page 45 and 46: Streaming Data CHAPTER 2: OVERVIEW
Page 47 and 48: Logging Data Area Number of Bytes I
Page 49 and 50: Using PID Loops What is a PID? CHAP
Page 51 and 52: Equations Common to All Algorithms
Page 55 and 56: CHAPTER 3 Chapter 3 Using the SNAP
Page 57 and 58: CHAPTER 3: USING THE SNAP ETHERNET
Page 63 and 64: Environment Visual Basic 6 Internet
Page 65 and 66: MemMap Example Code CHAPTER 3: USIN
Page 71 and 72: Return Values CHAPTER 3: USING THE
Page 73 and 74: IsOpenDone V Close V Return Values
Page 75 and 76: Digital Point Methods CHAPTER 3: US
Page 77 and 78: SetDigBankOnMask V [in] long nPts63
Page 79 and 80: Analog Bank Methods CHAPTER 3: USIN
Page 81 and 82: GetStatusWatchdogTime [out] long pn
Page 87: GetLastStreamStandardBlock (ActiveX
Page 91 and 92: CHAPTER 4: USING THE IEEE 1394-BASE
Page 93 and 94: Bytes 0-3 Bytes 4-7 Bytes 8-11 Byte
Page 95 and 96: Bytes 0-3 Bytes 4-7 Bytes 8-11 The
Page 97 and 98: Bytes 0-3 Bytes 4-7 Bytes 8-11 Byte
Page 99 and 100: Read and clear latches for individu
Page 101 and 102: Scaling CHAPTER 4: USING THE IEEE 1
Page 103 and 104: Read and Write Packet Structure Par
Page 109 and 110: CHAPTER 5 Chapter 5 Advanced Modbus
Page 111 and 112: CHAPTER 5: ADVANCED MODBUS PROGRAMM
Page 113 and 114: APPENDIX A Appendix A SNAP Ethernet
Page 115 and 116: Status Area Read—Read Only This i
Page 117 and 118: Date and Time Configuration—Read/
Page 119 and 120: Security Configuration—Read/Write
Page 121 and 122: Serial Module Configuration—Read/
Page 123 and 124: Wiegand Serial Module Configuration
Page 125 and 126: SNMP Configuration—Read/Write (Do
Page 127 and 128: Starting Address Length Type Descri
Page 129 and 130: Starting Address Length Type Descri
Page 131 and 132: Digital Point Read—Read Only NOTE
Page 133 and 134: Analog Point Read—Read Only See
Page 135 and 136: Analog and Digital Point Configurat
Page 137 and 138: Digital Events and Reactions—Read
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Starting Address Length Type Descri
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Analog Point Calculation and Set—
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Analog Read and Clear/Restart—Rea
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Serial Event Configuration—Read/W
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Data Log—Read/Write (Does not app
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Appendix B Table of Offsets Introdu
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Module Point (Decimal) Point (Hex)
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Index A access, setting up SNMP sec
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error codes IEEE 1394-based protoco
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O off-latch, 20 offset, 24 IEEE 139
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