RAW-Connection User`s Guide
Contents
1. Set remote IP address and port no 5 8 des sin_family AF_INET des sin_addr s_addr ipaddr des sin_port p len sizeof struct sockaddr_in connect to remote i 0 for 77 j connect fd struct sockaddr amp des len if J 0 connected break if WSAGetLastError WSAEISCONN already connected j 0 break if i gt RETRY Connected failed too many times gt give up break Sleep INTERVAL Sleep for a while before trying it again Prevent from wasting too much of CPU time ife jJ 0 4 Can t connect to remote closesocket fd return INVALID_SOCKET return fd Programming Example 2 The following program was developed under VB6 0 with serial settings 38400 n 8 1 Private Sub cmdConnect_Click If txtIP Text Or txtPort Text Then Exit Sub Winsockl Connect txtIP Text txtPort Text txtStatus Text txtStatus Text amp Connecting amp vbCrLf Timerl Enabled True End Sub Private Sub cmdDisconnect_Click Winsockl Close txtStatus Text txtStatus Text amp Connection Close amp vbCrLf End Sub Private Sub cmdClose_Click 6 8 If MsgBox Are you sure to shutdown the Remote Server application vbQuestion vbYesNo Shutdown vbNo Then Exit Sub SendData Close Winsockl Close End Sub Private Sub cmdSendKey_Click Dim strMsg As String strMsg InputBox Please enter any letters to s2. 0 if len lt 0 No data read Sleep 10 Prevent from wasting too much of CPU time else for i 0 i lt len i printf c buf i closesocket fd Close TCP connection else printf fail n On windows we need to call WSACleanup to free SOCKET resource before exiting the program 4 8 WSACleanup printf hit any key to stop program n getch printf program exit n return 0 fel Convert dot notation to IP address ie From 192 168 2 1 to 0x0102A8C0 unsigned long dot2ip char dot unsigned long ip unsigned char c int bya c unsigned char amp ip for i 4 i gt 0 d dogh VON LE a S lt 40 do 9 return IP_ERROR while dot gt 0 amp amp dot lt 9 ASO tee dott NON if de gt 255 return IP_ERROR c d if dott break wE dot 4 return IP_ERROR return ip Connect to remote TCP port SOCKET sioopen unsigned long ipaddr int port struct sockaddr_in des int i j len SOCKET fd BOOL b TRUE ULONG mode 1 set to non_delay mode unsigned short pi p htons unsigned short port open socket fd socket AF_INET SOCK_STREAM 0 if fd INVALID_SOCKET return fd Set SOCKET to No Delay mode if i1octlsocket fd FIONBIO amp mode closesocket fd return INVALID_SOCKET
3. TCP port 4001 is the default for the NPort family The host first connects to NPort Server via the TCP socket port and then reads or writes the serial data after the connection has been established The application Architecture TCP NP covet Ethermet NPort Server Lite 1 8 Configuring NPort Server 1 NPort Server Lite applies to firmware v 2 00 or above for DE 301 302 304 331 332 334 1 1 Telnet NPort Server Lite s IP address default 192 168 127 254 to access the Telnet console Note The LCD panel can be used to change the IP address amp netmask to fit your network scheme Refer to Appendix B of the User s Manual for more details 1 2 Choose the VT 100 console terminal type by pressing 1 1 3 Use the arrow key to move the cursor to serverConfig and then press Enter Make sure VT100 Arrows is enabled From the Telnet main menu access Terminal gt Preferences 1 4 Move the cursor to Operating mode press Enter and then select RAW Connection Mode 1 5 Press ESC move the cursor to Restart and then press Enter to reboot the system 2 NPort Server Pro applies to firmware v 1 10 or above for DE 303 308 2 1 Telnet NPort Server Pro s IP address default 192 168 127 254 to access the Telnet console 2 2 Choose the VT 100 console terminal type by pressing 1 2 3 Move the cursor to Server and then press Enter to configure IP address nestmask DHCP and gateway 2 4 Press ESC
4. 80 SOCKET fd if argc lt 3 printf Syntax s NPortIP TCP_Port n argv 0 return 1 ip dot2ip argv 1 if ip IP_ERROR printf Invalid IP address s n argv 1 return 2 port atoi argv 2 3 8 On windows we need to call WSAStartup before calling any SOCKET function If your project VC VB DELPHI has include TCP IP MODULE on it you do need not to call this function because it is called automatically when you select TCP IP module if WSAStartup 0x202 amp wsaData SOCKET_ERROR fprintf stderr WSAStartup failed with error d n WSAGetLastError WSACleanup return 5 connect to remote printf connecting to gt s s argv 2 argv 1 fd sioopen ip port ae fd INVALID_SOCKET printf ok n printf lt ESC gt stop program n printf Any key send to remote n printf Dumb terminal begin n print n sprintf buf Welcome to MOXA NPort RAW mode example prog r n send fd buf strlen buf 0 Send welcome string to remote for 7 if kbhit keyboard is hit ch getch if ch 27 user hit lt ESC gt gt exit printf n break send fd amp ch 1 0 Send data to NPort if ch n send fd r 1 0 send LF as CR LF if ch r send fd n 1 0 send CR as CR LF len recv fd buf sizeof buf
5. RAW Connection User s Guide Introduction NPort Family products make an ideal Ethernet gateway for serial RS 232 422 485 data and support raw data transmission making it possible for serial data to travel over a LAN When NPort server receives raw serial data a TCP IP header and trailer are added and then the resulting packet is sent out over the Ethernet medium Once the control host receives the TCP IP frame the NOS Network Operating System recovers the raw data by decoding the TCP IP header and trailer This allows the user to easily capture the raw serial data via the Ethernet using either Telnet or a customized TCP IP socket program and provides an ideal solution for long distance serial data transmission between host and serial device The Client Server Principle In general the Client is a program e g Internet Explorer which actively requests a specific service with the service often located on a remote host A Server on the other hand is a program that passively listens and responds to requests from Clients It is often the case that Clients reside on an individual s PC and Servers reside on larger and faster computers used specifically to run Server programs in fact this type of computer is itself often referred to as a Server The raw connection allows NPort Server to act as a passive server that listens for service requests from client hosts with the request specified by a socket port e g
6. end back to the Server Send Key If strMsg lt gt Then If Not SendData Keyboard amp strMsg Then Winsockl1 Close End If End If End Sub Private Sub Timerl_Timer MsgBox Client could not find server vbCritical If Winsock1 State lt gt sckClosed Then Winsockl Close End If Timerl Enabled False txtStatus Text txtStatus Text amp Connection Fail amp vbCrLf End Sub Private Sub Winsock1_Connect Timerl Enabled False txtStatus Text txtStatus Text amp Connection Established amp vbCrLf End Sub 7 8 Private Sub Winsockl_DataArrival ByVal bytesTotal As Long Dim strData As String Winsock1l GetData strData txtStatus Text txtStatus Text amp Get data amp strData amp vbCrLf amp vbCrLf End Sub Private Function SendData sData As String As Boolean On Error GoTo ErrorHandler Dim lngTime As Long blinReply False Winsock1l SendData sData Do Until Winsock1 State 0 Or lngTime lt 10000 DoEvents lngTime lngTime 1 If lngTime gt 10000 Then Exit Do Loop SendData True Exit Function ErrorHandler SendData False MsgBox Err Description vbCritical Exit Function End Function Reference Information You may access Moxa s website at www moxa com for firmware downloads and upgrades 8 8
7. ervice The request is commonly made by application software built in or installed on the user interface PC or terminal refer to the Programming Example given below for more details on how to use this operation mode 2 8 Programming Example 1 The following example was developed under VC 4 2 for Windows 9x NT 2000 TITLITITTLITTATTT TITTIES TTT NPort RAW mode Tx Rx example program Date 08 30 2001 _ Version 10 Program description A dumb terminal emulation example program via NPort RAW mode eA 1 hit lt ESC gt to stop the program eA 2 program sends data from the keyboard to NPort 3 program prints to the screen any data read from NPort 4 Syntax as_raw NPort_IP TCP_PORT if 5 Program developed under VC 4 2 LE 6 May be used on Windows 9X NT 2000 OS VALLAL VALT IILI LLI ELLIT EILA ILEESE LANELLI TITE include lt winsock2 h gt include lt stdlib h gt include lt stdio h gt include lt fcntl h gt include lt string h gt include lt conio h gt define IP_ERROR OxFFFEFFFFL Invalid ip address define INTERVAL 100 10 msec define RETRY 50 connect retry count SOCKET Fd Socket descriptor used on data Tx Rx unsigned long dot2ip char dot SOCKET sioopen unsigned long ipaddr int p int main int argc char argv int port i unsigned long ip WSADATA wsaData char ch len char buf
8. move the cursor to OP_mode press Enter and then select RAW connection mode 2 5 Press Enter to set the serial port s to RAW connection 2 6 Move the cursor to Pure raw data mode and then press enter for more settings including TCP port No etc 2 7 Press ESC move the cursor to Save to save the configuration and then move to Restart to reboot the system amp Notes Destination IP Keep blank to allow access for all hosts or enter an IP address to allow access to only one host Inactivity time 0 99 min the serial port will be reset if there is no transmission during this time TCP alive check time 0 99 min the TCP connection will be reset if there is no activity for a length of time equal to tcp_time_out Introduction of socket interface This interface provides easy to use commands for building up customized applications When using the Socket Interface connections are established with an IP address and port number The IP address identifies a remote host and the port number identifies an application process e g 80 for www browser service The combination of lt IP address port number gt allows the user to access the desired application process running on the remote host NPort Server will launch the bi directional serial transmission service and then listen for requests from the Client via NPort server s IP and TCP port 4001 the manufacturer s default value after the user starts up the raw connection s
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