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Ethernet Developers Guide
840 USE 115 00 Version 1.0
73
If the remote node is an IP address, or if it’s a name that has been resolved, then
CSample_View tcpip_connect_r
q
function is called to initiate a connect re
q
uest to
the remote node. The listen port for the connect re
q
uest is five hundred and two,
and is defined b
y
the constant MBAP_LISTEN_PORT in modbus.h. If
tcpip_connect_r
q
succeeded in initiatin
g
a connect re
q
uest, then tcpip_connect_r
q
chan
g
es the transmit state to CONNECTING, otherwise it chan
g
es the transmit
state to IDLE.
The window sockets DLL
g
enerates a FD_CONNECT event which indicates if the
connect re
q
uest succeeded or failed. CSample_View OnTcpIpConnect function
processes the FD_CONNECT event. If the connect re
q
uest succeeded,
OnTcpIpConnect chan
g
es the transmit state to CONNECTED, otherwise it
chan
g
es the state to IDLE.
Recall that MFC architectural framework calls CSample_View OnPollInterval
member function to processes WM_POLL_INTERVAL messa
g
e sent as result of
CMainFrame class processin
g
a WM_TIMER messa
g
e. OnPollInterval examines
the transmit state. If the transmit state is CONNECTED, and the user has selected
a transaction t
y
pe, then OnPollInterval calls CSample_View TransmitUserRe
q
uest
function.
TransmitUserRe
q
uest encodes a re
q
uest based on the transaction t
y
pe, saves the
current time, and calls CSample_View TransmitMessa
g
e function. OnPollInterval
uses the saved time to determine when to transmit the next re
q
uest.
TransmitMessa
g
e attempts to send a messa
g
e to the remote side. To send the
messa
g
e, TransmitMessa
g
e enters a loop. In the bod
y
of the loop transmit
messa
g
e calls the window socket DLL send function. The followin
g
lists the
outcomes of the send function and the actions taken.
The messa
g
e was sent successfull
y
. TransmitMessa
g
e chan
g
es the transmit
state to TX_DONE and exits the loop.
Onl
y
part of the messa
g
e was sent. TransmitMessa
g
e reenters the loop.
Send function returns an error indicatin
g
there is no buffer space within the
transport s
y
stem. TransmitMessa
g
e chan
g
es the transmit state to BLOCKED
and exists the loop.
Send function returns some other error. TransmitMessa
g
e closes the
connection, chan
g
es the transmit state to IDLE, and exits the loop.
When buffer space within the transport s
y
stem becomes available to transmit
messa
g
es, the window socket DLL
g
enerates a FD_WRITE event. CSample_View
OnTcpWrite function processes the FD_WRITE function b
y
callin
g
TransmitMessa
g
e.
- Modicon Quantum Ethernet 1
- Web Embedded Server 1
- Module User Guide 1
- Web Embedded Server Module 3
- User Guide 3
- Document Set 4
- Contents 10
- About This Book 11
- Document Scope 11
- Related Documentation 12
- Validity Note 12
- Introduction 13
- Twisted Pair 140 NOE 211 10 14
- Fiber Optic 140 NOE 251 10 14
- 1.2 Front Panel Components 15
- 840 USE 115 00 Version 1.0 16
- NOE 251 10 16
- NOE 211 10 17
- 1.2.2 Address Labels 18
- 8 4 . 1 1 . 1 1 4 . 1 6 8 19
- 1.2.3 Twisted Pair Connector 20
- 1.2.4 Fiber Optic Connectors 20
- 1.3 Utility Diskette 21
- 1.4.2 Compatibility 23
- 2.1 Before You Begin . . 25
- 2.1.2 Verifyin 26
- 2.2 Installing the Module 27
- 2.2.3 Connecting the Cable 28
- 2.4.2 Assigning a Slot Number 31
- 2.4.5 Resetting the Module 32
- The MSTR Instruction 35
- 3.1 Introduction 35
- 3.2 MSTR Description 35
- 3.2.1 Characteristics 36
- 3.2.2 Representation 37
- data area 44
- control block 44
- information: 50
- Wide Web 51
- 4.1 Introduction 51
- Retrievin 52
- Data via the World Wide Web 52
- Premium PLCs 53
- Using the Network Options 55
- Ethernet Tester 55
- 5.1 Introduction 55
- Figure 21 Get Statistics Box 58
- Figure 22 Sample Statistics 59
- Figure 23 Read Register Box 61
- Ladder Logic Block 62
- Library User Guide 62
- Maintenance 63
- 6.1 Responding to Errors 63
- 6.1.2 Active LED 64
- 6.1.3 Ready LED 64
- Specifications 73
- Ethernet Developers Guide 75
- B.1 Introduction 75
- B.2 References 75
- B.3 Overview 76
- B.4 Development Environment 76
- B.5 Class Descriptions 77
- B.6 The CSample_doc Class 78
- B.7 The CSample_View Class 79
- B.8 Timers 81
- B.9 Transaction Processing 81
- B.10 Transmit State Machine 82
- B.11 Receive State Machine 84
- Quantum Ethernet TCP/IP 87
- Modbus Application Protocol 87
- C.1 Introduction 87
- C.3 TCP/IP Specific Issues 92
- C.4 Reference Documents 93
- Suppliers 95
- Glossary 100
- 840 USE 115 00 Version 1.0 103
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