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1. Set User ID and Password index userid password Clear User ID and Password Return to previous menu CG LN BR GA H rs EXAMPLE To set User ID to root password toor gt 4 1 root toor Enter Command gt Security Configuration Screen 62 Chapter 7 Troubleshooting This chapter outlines some problems that may occur during installation operation and some possible solutions to them If you follow the suggested troubleshooting steps and the EtherPath still does not function properly please contact your dealer for further advice Hardware Problems Before anything else check that all cables used are wired correctly and properly connected If connecting to a 9 pin PC port a crossover null modem cable is required P1 All the EtherPath s LEDs are off S1 Check the power supply or power connection P2 When using 10Base T cabling the EtherPath unit does not work S2 Check the Hub s link LED for the port to which theEtherPath is connected If it is off make sure the network cable between the EtherPath and hub is in good condition You may only use one of the LAN connections at a time Make sure the Hub supports 63 EtherPath User s Guide 10BaseT or 100BaseT Sometimes it helps to move the network cable to a different hub port or power cycle the hub especially when using smart hubs or Ethernet switches 64 Troubleshooting Can t Connect via the LAN P1 Can t connect to the
2. IEN 60 Level Sne n E gue ege 60 RE 61 Level eege tg eee Res a Be 61 Chapter 7 Troubleshooting c ssccccsccscscssccssccesscsessssesesee 63 Hardware Problem 63 vi Introduction Can t Connect via the LAN 65 Other Probleminin n tee ad Aeteceee es 67 Checking Device Operaton 69 Appendix A Specifications ccccccccccscsscscsscssscsscesscsesscsreses 70 EtherPath SpectfDeatong 70 RS 232 PIN Asstgnments 71 Ring Indicator eeeeseseeeeseeeeseeseeeeseeeeseeeeees 73 GABLES E 74 To PC 9 pin COM pont 74 SR Mux Composite or Access Switch Input Port 74 SS 1 to Modem asirning unenian Specialty Cables Ethernet Cross Over Cable cccccceseee 75 Appendix B Programming e seeseeeerserserosesee Introduceton Description and Behavior vil Ports used by the EtherPath cece 77 Server Mod rn ans wees 78 Transmit Condtons 78 Locking Avoidance Mechanisme 79 When in Raw Server mode 79 Application Notes 80 Appendix C AT Command Summa r ccscscssssesscceseccessees 81 AT Commande 81 AT Command Rosponses seses sesers rereset 82 AT Command Operation ccceceeseesseeseesseeeeseeees 82 Appendix D RS 422 RS 485 Inter face cscscsssessceeseceees 83 Introductions sa Saves hedsiehs 83 Changing the Seng 83 RS 422 4 Wire RS 485 Interface Pinott 84 2 Wire RS 485 Interface Pinout cc eeeeeeseeeees 85 vil
3. 9 pin port a cross over null modem cable is required See the Appendix for wiring details Then apply power lead to the serial port device 11 Chapter 3 Terminal Telnet Configuration This Chapter describes how to configure the EtherPath s using Terminal configuration mode or Telnet configuration mode Web Browser mode is covered in the next chapter Overview The EtherPath can be configured using any of the following methods e Web Browser After installing the EtherPath in your LAN use your Web Browser for configuration See Chapter 4 Browser Configuration for details e Terminal Mode Use a serial cable connection and a communication program The advantage of this method is that you give the EtherPath a compatible IP Address prior to installation in your network e Telnet Mode After installing the EtherPath in your LAN connect to it using Telnet for configuration Both Terminal and Telnet modes provide the same user interface 12 Operation Terminal Configuration Terminal configuration requires the following e PC with terminal emulation program or a dumb terminal e Serial cable to connect the PC to the EtherPath See the Appendix for cable requirements A Crossover null modem cable is required when using a 9 pin PC port Procedure 1 Connect the EtherPath to your PC or terminal using a null modem cable 2 Press the configuration setup switch momentarily It is located on the side
4. ICMP e TELNET e SNMP e AT Dial The EtherPath has been tested to work with e Al versions of Windows e Unix SCO Sun AIX Linux etc e Macintosh e Most serial devices such as scanners RTUs SCADA hosts alarm controllers POS devices PCs terminals etc e VOIP multiplexers digital video cameras video conferencing systems etc Chapter 2 Installation This Chapter details the LAN installation process for the EtherPath Overview For Telnet Mode or Web Browser Mode configuration LAN installation is performed before configuration There must also be a valid IP address in the unit prior to configuration with these methods The default IP address may not work with your network If you use Terminal Mode configuration then the configuration should be performed prior to LAN installation See Chapter 3 for details LAN Installation 1 Connect the Network Cable e The EtherPath network interface is auto sensing Simply connect your network cable to the appropriate connector on the EtherPath panel Configuration 2 Connect the Power Adapter Cable Plug in the power adapter cable After about a four second boot process the EtherPath is ready for operation AE at Dia Only use the power adapter provided x ay with the EtherPath Using a different one may cause hardware damage 3 Connect the Serial Port Device Connect the serial port device to the serial port on the EtherPath If connecting to a PC
5. PC to ensure that the connection is still open If there is no response the device will reset to the initial state and attempt to reconnect Also if the RS 232 link is broken it will be reconnected automatically if possible when in Hardware connect mode This operation is described in the Appendix Protocol Conversion The RS 232 device at the client end and the device at the server end of a link do not have to use the same communications protocols on Introduction the RS232 link speed parity flow control The EtherPaths will convert the data to the correct protocol Configuration Security Etherpath configuration may be Locked down or restricted in several ways The web Browser interface telnet configuration interface and SNMP configuration interfaces may be disabled Specific IP addresses may be configured into the unit to disallow configuration from any other than the desired management workstations Upgradeable Firmware Firmware upgrades are downloadable to the EtherPath The utility program required for this and the actual firmware upgrades are available from your dealer EtherPath User s Guide Physical Details The EtherPath front and rear panels are shown below Figure 1 EtherPath Figure 2 EtherPath Introduction Configuration Switch There is a momentary action push button switch on the rear of the unit behind a small hole Pressing this switch places the unit in conf
6. Telnet via web browser and SNMP This setting may not be performed from the web configuration screen Configure Level 1 and Level 2 security as needed Using the telnet or direct connection configuration enter up to three user name and password pairs If there is at least one user name in this list then a password prompt will be issued upon establishing a telnet configuration session There may be up to 3 user names and passwords configured If no users are configured password protection is disabled User names and passwords are limited to 8 characters each There is a six failed login attempt limit After six failed attempts in a row the unit will lock out all logins for a period of about 10 minutes Each user name has an associated user ID or index The user with ID 1 is considered the master user It has the ability to change the other user names and passwords The other two user ID s are limited to only changing their own user name and password All users may modify any other system parameters EtherPath User s Guide The serial interface is not subjected to user login since it requires physical access to the unit SECURITY CONFIGURATION Web Configuration ENABLED Telnet Configuration ENABLED SNMP Agent ENABLED Index UserName Password SET SECURITY CONFIGURATION Disable Web Configuration 0 ENABLED 1 DISABLED Disable Telnet Configuration O ENABLED 1 DISABLED Disable SNMP Agent 0 ENABLED 1 DISABLED
7. an IP packet is transmitted 42 Operation Block Size The maximum Ethernet packet buffer size The minimum value is byte the maximum 4096 bytes 4 K Typical values are either in a low range of 10 20 characters for polling applications or very large in the range of 500 to 1500 for file transfer applications Normally the timer triggers a packet transmission before the block fills If the buffer contains BLOCKSIZE characters an IP packet is transmitted This setting is rarely changed from the default Flow Control OFF Buffer Level If the amount of data stored in the buffer reaches this point and the EtherPath is unable to transmit the data then no further input will be accepted Under normal operation this will not happen This is normally left at the default value Flow Control ON Buffer Level Once the High Water mark has been reached the no input accepted mode will continue until the EtherPath has transmitted enough data to reduce the buffer contents to this point This is normally left at the default value Line_Terminator_Character This setting is used to change the Line Terminator Character The Line Terminator Character causes any data in the buffer to be transmitted immediately the character is received provided This is the binary value of the trigger character e The EtherPath is being used in Client mode e The following setting Transmit_on LT Char is ON Transmit_on_LT_Char When thi
8. and send it by Ethernet to the application when the buffer is full or on the next tick of the transmit timer Transmit Conditions The EtherPath will transmit an Ethernet packet when any of these conditions are met e Transmit Timer is up and running in Transmit Timer Mode e Idle Timer is up and running in Idle Timeout Mode e Transmit Buffer full e LT Character is encountered and Transmit on Line Terminator Function is ON Client Only 78 Specifications Locking Avoidance Mechanism When two EtherPaths are used to emulate a direct serial connection over the network as described previously the Server Mode EtherPath could be locked if its connecting Client Mode EtherPath disconnects abnormally If this situation happens no connection to the Server Mode EtherPath is possible and it should be reset To solve this problem the following system is used When in Telnet Server mode a telnet NOP command is used as a heatbeat keep alive signal A fixed keep alive time of 60 seconds is used When in Raw Server mode 1 A Keep Alive message is defined as a 21 byte string sErlaLsErVeRkEePaLiVe 9 This string sErlaLsErVeRkEePaLiVe is sent out by the Client Mode EtherPath if the time since the previous transmission exceeds the configured keep alive time It tells the Server Mode EtherPath that I am still alive and do not close the connection It keeps sending out this string every keep al
9. is an excellent low cost program also available from http www dcbnet com Description and Behavior Ports used by the EtherPath The EtherPath uses 3 ports as follows From Port 8000 Server Mode EtherPath listens at the port and offers a raw TCP connection This port number is configurable Default is 3000 The Client Mode EtherPath uses a sending port between 1025 and 4999 to connect to its Remote Host The port number starts at 1025 and increments as needed Note that EtherPath version 5 2 and earlier always used port 5000 as the sending port Provides a telnet configuration service for all modes Do not use port 8000 in user written programs For user written client application avoid port number 8000 The Server will respond to any configured port number other than that 77 EtherPath User s Guide Server Mode In Server mode the EtherPath runs under the TCP IP network protocol It will listen on a configured port number The server will wait for connection after initialization After a connection is established the server always keeps checking for data on both Ethernet and Serial Ports If data from the Ethernet network is received it will first check for a special control symbol filter it if found and then send the rest of the data to the serial port If data from the serial port is received it will read the data from the serial buffer move the data into the network buffer
10. mode and a single EtherPath configured in Client 54 Operation mode Under user control with AT commands the Client connects to multiple Servers one at a time similar to the way a dial up modem would Server and Client refer to the operational mode settings of the EtherPath All EtherPaths must be connected as described in Chapters 3 and 4 One serial port device is connected to each Server EtherPath and additional serial devices usually a workstation are connected to the Client EtherPaths The Client EtherPath must be configured for ATD dialing This is the unit that will place the calls to the other EtherPaths At the Client end start the Terminal emulation program or use a real terminal The communication settings for this device must be the same as the values entered into the Client EtherPath device earlier Power up the local EtherPath It will be in command mode awaiting a connection command Type the command AT lt enter gt to test the RS 232 connection It should answer with an OK message If not check the serial port rate and wiring connections Dial a remote EtherPath by using an ATD dial command ATD1 2 3 4 5555 where 1 2 3 4 is the IP address of the remote EtherPath and 5555 is the optional connection port number configured in the remote EtherPath The EtherPath will automatically connect to the remote EtherPath If an ad
11. the Serial Port Device 49 EtherPath User s Guide Device Name This can be used to store a descriptive name for the device Physical Location This can be used to store he location of the device SNMP Community Name The SNMP community name The default is public 50 Operation Configuration Summary Screen mr Hap L ees az 2 Lues skemas Ziet 1 Irene Ara Loode meng rm rn nes rech Len re Lsa Lae Cire cows H Configuration Summary LAN Configuration _ Manager Access Rights os 166 54 216 IP Ades 1 0 0 00 Bewok Mack 255 255 2550 iP Adaren pafo Gateway IP Address 0 0 0 0 E Address 3 0 0 0 0 Remote Deve BP Address 1410000 IP Address SE Made Sever TP Pon 3000 Fragmentation Allowed Ethernet Mode n Enabled Dewees Name GWO000B0 Physical Location Head Office SUMP Commu pe Seene V53 j z5 Flow Coaol NONE mmer mode EE arty HONE Bloc se ome G Daas me Flow OFF tert Gi Stop Bite he Row Cd 59 bo Pin 6 Control Forced ON Line terminator char des D Dat fu Hardware Pa 6 Dil Tran on LT char oF Se EE ce et local char echo oF Keep Alve Frequency seconds Carton SR eae Tas Cie es La Figure 8 Configuration Summary Screen Operation e This screen displays all current settings for this EtherPath e Clicking the Set t
12. through the serial RS232 connection Current Configuration Switches Status Current setting of the DIP Switches Current Connection IP Address The IP address of thedevice PC terminal or remote EtherPath to which the EtherPath is currently connected through the LAN link If it is not connected this field will display No active connection 30 Operation Main Menu Option 6 Reset Configuration to Default Selecting 6 from the Main Menu will restore all values to their defaults If using Telnet the connection will be lost when the EtherPath reboots To reconnect you must connect to the default IP Address of 192 168 1 1 or change the EtherPath IP address to one that is appropriate for your network before rebooting with main menu option 7 Main Menu Option 7 Save and Exit Selecting 7 from the Main Menu will store the configuration details in the EtherPath and exit the configuration program If using Telnet the connection will be lost when the EtherPath reboots If you have changed the IP Address you must use the new IP Address when you reconnect Using option 7 when there were no changes made is one way to effect a cold reboot on a remote EtherPath Main Menu Option 8 Security Configuration Selecting 8 from the Main Menu will display the security configuration screens 31 EtherPath User s Guide SET SECURITY CONFIGURATION 1 Disable Web Configuration 0 ENABLED 1 DISABLED
13. 2 RS 485 Interface This Appendix describes the EtherPath s 4 2843 RS 422 485 interface This interface option may configured in the field or pre configured at the factory via configuration settings Introduction The 9 pin serial connector on the EtherPath may be for either RS 232 or RS 422 4 wire RS 485 point to point operation Changing the Setting The 9 pin serial connector may be used for either RS 232 RS 422 4 wire RS 485 point to point or 2 wire RS 485 operation by changing software configuration settings on the Configure Port screens 83 EtherPath User s Guide RS 422 4 Wire RS 485 Interface Pinout Pein Serien Tape o Receive Dai Rr n Le Noconmeston Lu C Receive Daa n Ce Ireenpepd ou o ocom _NA_ NOTE Older versions of this product used a different pin out for RS 422 and RS 485 For plug in compatibility order adapter part number 9802073 84 Specifications 2 Wire RS 485 Interface Pinout rin Signainame Type Ps Noconmeston wa 7 NOTE Older versions of this product used a different pin out for RS 422 and RS 485 For plug in compatibility order adapter part number 9802073 RS 485 2 wire Fan out Since this unit is most often used as an RS 485 2 wire end point it will support 32 devices on the RS 485 line Use good engineer practice for RS 485 lines Where applicable include termination for long lines
14. 2 Disable Telnet Configuration 0 ENABLED 1 DISABLED 3 Disable SNMP Agent 0 ENABLED 1 DISABLED 4 Set User ID and Password index userid password 5 Clear User ID and Password 0 Return to previous menu XAMPLE To set User ID 1 to root password toor gt 4 1 root toor Enter Command gt E Set Security Configuration Screen Disable Web Configuration The web configuration may be turned off If set to disabled the unit will not answer to web browser inquires Disable Telnet Configuration If disabled the unit will not answer telnet connection requests on port 8000 and the only configuration method will be direct terminal connection Disable SNMP Agent If disabled the unit will not respond to SNMP traps and gets Set User ID and Password Used to establish user names and passwords Clear User ID and Password Clears existing user names and passwords The EtherPath uses the industry standard IP protocol Since this is a well known standard its security vulnerabilities are also well known and may be exploited Several EtherPath options are available to 32 Operation enhance the inherent security of your EtherPath network However since network security is a moving target and absolute security is never achievable every network installation should be designed and implemented with care to minimize security risks in a way that is appropriate for the application and perceived risks The EtherPath may be configured w
15. 8 Client Local Character Echo 9 Keep Alive Freouencn Main Menu Option 5 Display Settings sscscesssessssececsseteeeeeeeeessees 28 Current Riatsteg edd 29 Network Packets Received o ececeecseseteeeeeeees 29 Network Packets Transamtted ceeeeeeeeeee 29 Network Packet Errors Port Bytes Received eeeeseesesesseeseseeeeeeeseeeens Port Bytes Transmitted 30 Current Confgeuratpon 30 Switches Status iii Current Connection IP Address 30 Main Menu Option 6 Chapter 4 Reset Configuration to Default eee 31 Main Menu Option 7 Save and Eat 31 Main Menu Option 8 Security Confgeuraton 31 Disable Web Confteurapnon cesses 32 Disable Telnet Confteurapon 32 Disable SNMP Agent 32 Set User ID and Dassword 32 Clear User ID and Dassword 32 Main Menu Option 9 SNMP Configuration 33 Contact Person menmain ns 34 Device Nr erer ENEE 34 Physical Locapon 34 SNMP Community s sesos iar 34 Main Menu Option 0 Exit without Saving 34 Browser Configuration cccccccsssssssssssssssreses OD OVERVIEW is ok ite Gee EE 35 Connection Drocedure ci eeeeeeseeeeeeeneeseteeeneeeeeees 35 Web based Interface 37 Port Configuration Sereen 38 Flow Controlin teks sett Aen ees 38 Baudbatg ert reest gea 39 No le Rona EOE OER TR eee 39 iv Introduction Data Bits Stop Bits D RER EE 39 RS 485 Mode Displayed only if jumpered for RS 485 39 Port Activity Bereen Advanced Configuration Scr
16. 8400 4 19200 5 9600 6 4800 7 2400 8 1200 9 600 10 300 3 Parity bit O None 1 Odd 2 Even 4 Data bits O 7bits 1 8bits 5 Stop bits O lbit 1 2bits 6 Pin 6 Control 0 From Interface 1 Forced ON 7 Dial Mode O ATD 1 Hardware Pin 6 8 RS485 Mode O0 4 wire 1 2 wire 0O Return to previous menu EXAMPLE To set the baud rate to 19200 gt 2 4 Enter Command gt This screen allows you to change the settings for the RS232 link The settings used should match the device connected to the serial port of the EtherPath Note that the EtherPath s serial settings must match the device that is plugged into THAT EtherPath The device at the other end of the Ethernet link may be set differently 21 EtherPath User s Guide Flow Control The choices are None XON XOFF and RTS CTS It is common to use NONE for installation troubleshooting then set it correctly to match the connected device If RTS CTS is used the cables must have handshake lines wired correctly RTS Toggle is a handshake mode commonly used with half duplex modems The RTS output is asserted when the unit has data to transmit and it will remain asserted for approximately Sms after the last character has been transmitted The CTS signal controls output flow Baud Rate Speeds between 300 bps and 230 4Kbps are supported Parity The choices are None Odd or Even Data Bits The choices are 7 or 8 This do
17. Address Selecting 2 from the Main Menu will result in the following screen Entry Manager IpAddr KKKKK KKKKKKKKKKKKKKEK 1 000 000 000 000 2 000 000 000 000 E 000 000 000 000 4 000 000 000 000 MANAGER SETUP set Entry Number Ip Address clear Entry Number 0 Return to main menu EXAMPLE to set entry 3 to IP address 138 239 0 24 gt set 3 138 239 0 24 to clear entry 2 IP address gt clear 2 Enter Command gt This screen shows a table containing four 4 entries By default all entries are blank These entries provide a security feature Only a user at one of the IP addresses shown can configure the EtherPath All users on the LAN can still access the EtherPath but not configure it If the entries are blank then any user on the LAN can configure the EtherPath If you are not sure about using this feature leave the addresses all zeros Entries in the table cannot be edited but commands are provided to insert SET and delete CLEAR entries 20 Operation Main Menu Option 3 Set Serial Port Data Selecting 3 from the Main Menu will result in the following screen PORT CONFIGURATION Flow Control NONE Baud Rate 9600 Data 8 Bits Parity NONE Stop 1 Bit Pin 6 Control FORCED ON Client Dial Mode HARDWARE Pin 6 RS485 4 wire Jumpers set for RS232 SET PORT CONFIGURATION 1 Flow Control O None 1 XON XOFF 2 RTS CTS 3 RTS Toggle 2 Baud Rate 0 230400 1 115200 2 57600 3 3
18. Base T 100Base T e CPU 16 Bit e Power 5 to 30 VDC 200 ma at 12 VDC or Optional power supplies e Switch Configuration e LED 3 multi purpose e Default IP address 192 168 1 1 e Default Receive port 3000 70 Specifications RS 232 PIN Assignments The EtherPath RS 232 port wiring is identical to a standard PC 9 pin DE 9P COM port It operates as a DTE device The chart below details signal directions and names Data Set Ready DSR Hardware controlled connection input See Section 5 Request to Send RTS Out Clear to Send CTS Ring Indicator RI Not used N 71 EtherPath User s Guide Control Signal Operation DCD Input ignored Receive Data Input data into the EtherPath Transmit Data Output Data from the EtherPath The EtherPath only transmits when it has characters to send and it is not flowed off with XON XOFF or RTS CTS flow control DTR Output Signal is enabled when the EtherPath has a valid LAN connection to another device This signal is low when powered on It goes high when a valid LAN connection is established and returns to low when that connection is disconnected Signal Ground Common ground DSR Input Used for connection control If the EtherPath is configured for Hardware Pin 6 Dial and not Forced ON the EtherPath connects to a remote device via the LAN when the signal is asserted If configured for Forced ON and Hardware P
19. ERVER Configuration setup Press any key to continue Pressing any key will then take you to the Main Menu EtherPath Main Menu Set Local amp Remote IP Address Subnet Mask and Gateway Address Set Manager Telnet IP Address Serial Port Configuration Advanced Configuration Display Configuration Settings Reset Configuration to Default Save and Exit Security Configuration SNMP Configuration Exit without Saving Choose a Number gt 2 3 4 5 6 7 8 9 0 Each of these menu options is explained in the following pages Entering Data Enter the number of the field you wish to change followed on the same line by a space and the data for that field For example On screen one to set the IP address field 1 to 192 168 1 10 gt 1 192 168 1 10 16 Operation Menu Options Main Menu Option 1 Setting IP Addresses Selecting 1 1 Set Local amp Remote IP Address Subnet Mask Gateway Address from the Main Menu will result in a screen which looks like the following LOCAL UNIT CONFIGURATION Local Address 205 166 54 216 Serial NO 00 09 AA 00 00 BO Remote Address NOT SET Gateway Address NOT SET Subnet Mask 2552552550 Server Mode Listen on Port 3000 IP Fragmentation ALLOWED Ethernet Mode Auto TCP Tx Timeout ENABLED SET LOCAL UNIT CONFIGURATION 1 Local IP Address 2 Remote IP Address 3 Gateway IP Address 4 Subnet Mask 5 6 Port Number IP Fragmentation 0 A
20. EtherPath User s Guide Revised April 12 2007 Firmware Version 7 0 FCC Statement This device complies with the limits for a Class B digital device pursuant to Part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference 2 This device must accept any interference received including interference that may cause undesired operation CE Marking Warning This is a class B product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures RoHS Compliant Copyright 1998 2007 All rights reserved Version 7 x All trademarks and trade names are the properties of their respective owners TABLE OF CONTENTS FCG Statement e are anii eE EEE i CE Marking Wammg i RoHS Compltant ececesssceesseeeeeeseeeeeeeeeneeees i Chapter 1 INtrOdUCtiON cccccscscssesssresssserseessessessersscssessees L EtherPath Fumncettons cccssssscecceeeeeeeeeeeeesseeeeneees Client Server Mode Servet Mod e2iasieniniaw nian Point to Multiple Point EtherModem Mode 3 Reverse Telnet Telnet Client Mode 3 Other Feature Siionin awardee Automatic Connection si AT Commands os Cette Connection Recover 4 Protocol Conversion 4 Configuration SBecutg 5 Upgradeable Fmware 5 INECC 6 Configuration Switch 7 LED Indicators ee ae dineses 8 Package Contents eeneg eeegeue
21. EtherPath using Telnet or Web Browser S1 Check the following Start troubleshooting from a known state Power the EtherPath and other equipment OFF and ON to reboot Ping the EtherPath to see if it responds From the Windows command prompt or Run dialog box use the command ping IP_Address Where IP_Address is the IP Address of the EtherPath e g ping 192 168 1 1 If it does not respond then check all LAN connections Ifthe workstation can not ping the EtherPath nothing else will work fix this first If the LAN connection are OK the problem is in the LAN addresses or routing You should be able to ping both EtherPaths in a Client Server pair If using a LAN without routers you can connect to the EtherPath ONLY IF your PC and the EtherPath are using IP Addresses from the same address block The EtherPaths default IP Address 192 168 1 1 requires that your PC is using an address from the address block 192 168 1 2 to 192 168 1 254 and a Network Mask of 255 255 255 0 Ifa router is between the devices a gateway address must be configured in both devices Check your PC s IP Address using Control Panel Network TCP IP Adapter Properties or similar commands appropriate for your computer If you are using a different Address block use Terminal Mode 65 EtherPath User s Guide configuration to set a compatible IP Address in the EtherPath Check that you have used the correct port address The defau
22. EtherPath when the connection is established You may now proceed as if the remote telnet server was connected to the serial port of your workstation Disconnect from that remote telnet server by lowering the hardware lead on pin six 58 Operation Chapter 6 Configuration Security This section discusses configuration options that restrict configuration Overview The EtherPath uses the industry standard IP protocol Since this is a well known standard its security vulnerabilities are also well known and may be exploited Several EtherPath options are available to enhance the inherent security of your EtherPath network However since network security is a moving target and absolute security is never achievable every network installation should be designed and implemented with care to minimize security risks in a way that is appropriate for the application and perceived risks The EtherPath may be configured with several levels of security configuration and authentication These restrict the ability of an unwanted user from changing the configuration of the EtherPathl They do not restrict the ability of a remote device to deliver packets to the EtherPath s data port At the level 0 any workstation may be used to configure the EtherPath via either telnet or web browser configuration Level 1 restricts configuration to workstations claiming to be from one of four IP addresses previously stored in the EtherPath Either web base
23. LLOWED 1 NOT ALLOWED 7 Operational Mode 0 Server 1 Client 2 Telnet Server 3 Telnet Client 8 Ethernet Mode 0 Auto 1 100Mb Full 2 100Mb Half 3 10Mb Full 4 10MB Half 9 TCP Tx Timeout 0 Enabled 1 Disabled 0 Return to previous menu Enter Command gt 17 EtherPath User s Guide 1 Local IP Address The IP address of this EtherPath device on your LAN The default IP Address is 192 168 1 1 2 Remote IP Address In Client mode this is the IP address of the remote Server device which this client will automatically connect to when powered up if RS 232 PIN 6 is high or forced and configured for hardware dialing This is also the default server that will be used for AT dialing when in PMP mode In Server mode this value is not required and will be ignored 3 Gateway IP Address If the remote device this unit communicates with is not on the same LAN then the gateway to the other LAN must be entered here 4 Subnet Mask The network mask indicates what class of TCP IP network you have The default value is for a class C network with up to 255 users This value should work in small networks If in doubt consult your network administrator 5 Port Number This is the TCP IP port number the EtherPath listens on when in server mode The default is port 3000 When in client mode this is the port on the remote server that a connection is attempt with This value may b
24. SET ADVANCED CONFIGURATION 1 Transmit Timer min lms max 10000ms Client Local Character Echo 0 OFF 1 ON Keep Alive Frequency 0 OFF 1 32767 seconds Return to previous menu M Timer Mode O transmit timer l idle timeout 2 Block Size min lbyte max 4096bytes 3 Flow Control OFF Buffer Level min 1 max 99 4 Flow Control ON Buffer Level min 1 max 99 5 Line Terminator Character min 0 max 255 6 Transmit on LT Character O OFF 1 ON 7 Server End of Line Filter O OFF 1 ON 8 9 0 EXAMPLE To set the Flow OFF level to 75 gt 3 75 Enter Command gt The EtherPath has a built in buffer to store data Most of these settings affect the operation of the buffer and how data is buffered and transmitted over the Ethernet The default values should normally be satisfactory but they may be tuned for optimum operation Note Options 5 6 7 and 8 apply to Client Mode only and have no effect in Server Mode 24 Operation 1 Transmit Timer When in Timer Mode The time period for which data will be stored in the buffer before being sent Allowable values range from Ims to 10 000ms 10 seconds A commonly used value is 20 msec When in Idle Timeout Mode The time period this unit s port must be idle after receiving a character before sending a block of data via the Ethenet This is used to keep incoming blocks of data intact It is useful for some protocols such as Modbus RTU Its setting depends
25. ata is buffered and transmitted over the Ethernet The default values should normally be satisfactory for most installations but they may be tuned for optimum operation Note Options 5 6 7 and 8 apply to Client Mode only and have no effect in Server Mode Transmit Timer When in Timer Mode The time period for which data will be stored in the buffer before being sent Allowable values range from lms to 10 000ms 10 seconds A commonly used value is 20 msec For example in this mode every 20 msec the buffer will be transmitted if there is any data in it When in Idle Timeout Mode The time period this unit s serial port must be idle after receiving a character before sending a block of data via the Ethenet This is used to keep incoming blocks of data intact It is useful for some protocols such as Modbus RTU Its setting depends upon the port speed and should be several character times Allowable values range from 1ms to 10 000msec 10 seconds A typical value for a 9 6 Kbps port is about 3 msec For example in this mode if there is data in the buffer and 3 msec passes with no additional data being received the buffer is transmitted Timer Mode When set to 0 the timer is a free running clock and if there is data in the buffer an IP packet is transmitted every TIMER msec When set to 1 the timer is a serial port idle time value If there is data in the buffer and the serial port has been idle for TIMER msec then
26. aths one at a time under the control of the attached RS 232 device The client operates similar to a modem with AT dialing enabled The attached device treats the EtherPath as if it was a modem using remote IP addresses instead of telephone numbers Reverse Telnet Telnet Client Mode This mode requires only a single EtherPath The EtherPath is connected to the serial port device and to the LAN The EtherPath will connect to most remote telnet servers under user control by using reverse telnet or telnet client operation The EtherPath User s Guide EtherPath will connect to any port number under user control with either hardware pin6 dialing or AT dialing By using the AT Dial commands the connected device can direct the EtherPath to connect to multiple remote devices one at a time Other Features Automatic Connection When used in Client Server mode the Client EtherPath will automatically establish a connection to the Server EtherPath on power up or under the control of an RS 232 control signal AT Commands The EtherPath responds to most common AT commands when in the Client mode Commands are listed in the Appendix Connection Recovery The EtherPath uses a proprietary protocol to ensure the client server session always exists on TCP IP When data hasn t been transferred through the connection for some time the EtherPath will communicate with the other device either EtherPath or
27. bleshooting note that the DTR signal is asserted as soon as a connection is active e The Client is configured for automatic connections Hardware Pin 6 Dial is the correct setting e The Client should either be configured for Pin 6 Control forced ON or the interface must be wired in such a way that that pin 6 is asserted e The Server s IP address was correctly entered into the Client s EtherPath in the Remote IP Address field e The Gateway IP Address is set correctly e The Subnet Mask is set correctly 67 EtherPath User s Guide PS S5 P6 S6 P7 S7 e The communication parameters between the PC terminal and the local Client EtherPath match e The communication parameters between the serial port device and the remote Server EtherPath match The EtherPath s IP Address is unknown Is there any way of finding it Follow this procedure e Yes see the chapter on using Terminal Configuration e Press the configuration button and use a terminal connection to read the existing configuration Why does the Server Mode EtherPath close the TCP IP connnection to the Client Mode EtherPath or other client program The Server Mode EtherPath will disconnect the link if it does not receive any packets from the Client Mode EtherPath or other client program within a 3 minute period or if hardware pin 6 is lowered See Appendix B for more
28. d or telnet configuration is allowed Level 2 disables remote configuration using web browser telnet or SNMP in any combination Level 3 requires a user name and password for remote 59 EtherPath User s Guide configuration Combinations of Level 2 and Level 3 are possible ie One may disable web browser configuration and SNMP and require a username password for telnet configuration The most secure method would be to disable all remote configuration The EtherPath may always be configured using the direct connected terminal method This requires physical access to the hardware and pressing the configuration button while a terminal or PC is connected to the serial port No specific security configuration is required Make sure that no IP addresses have been entered in menu item 2 Set Manager Telnet IP Address screen or the Administrator Access Rights of the web browser Configure LAN screen Also any user name password pairs that may have been entered on the terminal configuration telnet Security Configuration screen should be cleared Using any configuration method configure Administrator Access IP addresses Enter the IP addresses that should have the ability to change the EtherPath configuration If configuring this remotely insure that the workstation you are using is one of the valid addresses Operation Using telnet or direct connection configuration selectively enable or disable remote configuration via
29. default is normally appropriate but for low bandwidth links the keep alive packets may be sent less often In rare cases it is turned off by setting the value to zero 44 Operation LAN Configuration Screen Een GES Dn a Yen G Fenet Ier e mm E E EE Hase 2 D s beten Prods E1 Pt ren dran Loge dreet dene Praia Price Prowse Pus rs Pod Pome Cnccone gt LAN Configuration FtherPath Bless po pe fe Ween Maste E asf Gateway tawes E E EE Mode Server Cheat C Teine Server Telhet Cee besch Mode Auto RER 100M Balt RICH 10M Har Administrator Access Rights Maga P adden O E Maer P Adest EE Manages adress 3 0 O Manager P Ades E EE Remote Device D Address E e a a Remote Listen IP Port F107 t to 32767 Zoe Allowed Not Allowed TCP TaTimeont Enabled Disabled Sawa e Figure 6 LAN Configuration Screen This screen allows you to set all data relating to your LAN Local IP Address The IP address of this EtherPath device on your LAN The default IP Address is 192 168 1 1 Subnet Mask The network mask indicates what class of TCP IP network you have The default value is for a class C network with up to 255 users This value should work in small networks If in doubt consult your network administrator 45 EtherPath User s Guide Gateway IP Address If the remote EtherPath in Client Server mode is not on the same LAN then the gateway t
30. details The Keep Alive frequency configuration value affects this operation The connection works but is too slow If in Transmit timer mode lower the transmit timer to send packets more frequently 20 to 30 msec is a good range for many users If in dle timeout mode perhaps the serial data rate may be increased so characters arrive at the EtherPath faster 68 Troubleshooting Checking Device Operation Once the EtherPath is installed on your Network you can connect to it using Telnet to verify its operation The procedure is as follows 1 Leave the EtherPath in its normal operating mode 7 Use telnet to connect to the EtherPath with the command telnet IP Address 8000 Where IP_Address is the IP Address assigned to the EtherPath and 8000 represents the Port number e The port number is 8000 for configuration but 3000 is the default for normal operation e If the Manager IP Addresses have been entered in the EtherPath then only a PC having one of those addresses can change the configuration 8 Choose item 5 Display Settings from the Main Menu and examine the data shown See Chapter 3 for an explanation of each of the data items 69 Appendix A Specifications EtherPath Specifications e Flash Memory 512 Kbytes e SDRAM 512 Kbytes e EEPROM 512 Bytes e LAN Buffer 2 Kbytes e RS 232 RS 485 Buffer 4 Kbytes e RS 232 RS 485 one male DE 9 connector e Network Ethernet 10
31. dress isn t given the IP address stored during configuration is used Ifa port isn t given the port number stored during configuration is used Upon establishing a connection a Connect message is displayed If unable to establish a connection a Busy message is displayed You may now proceed as if the remote serial port device was connected to the serial port of your workstation 55 EtherPath User s Guide e Disconnect from that remote EtherPath with either the command followed by ATH or by lowering the hardware lead on pin six e See the Appendix for a complete list of AT commands and responses 56 Operation Client Reverse Telnet Mode Method 1 ATD dial mode The EtherPath must be configured for ATD dialing and set for client Start the Terminal emulation program or use a real terminal The communication settings for this device must be the same as the values entered into the Client EtherPath device earlier Power up the local EtherPath It will be in command mode awaiting a connection command Type the command AT lt enter gt to test the RS 232 connection It should answer with an OK message If not correct the RS 232 cable miswiring or terminal program problem Dial a remote telnet server by using an ATD dial command ATD1 2 3 4 5555 where 1 2 3 4 is the IP address of the remote telnet server and 5555 is the optional connecti
32. e buffer contents to this point This is normally left at the default value 5 Line_Terminator_Character This setting is used to change the Line Terminator Character The Line Terminator Character causes any data in the buffer to be transmitted immediately the character is received provided This is the binary value of the trigger charaacter e The EtherPath is being used in Client mode e The following setting Transmit_on_ LT Char is ON 6 Transmit_on_LT_Char When this setting is ON any data in the buffer will be sent immediately upon receipt of a Line_Terminator_ Character see previous setting When the setting is OFF the Line_Terminator Character has no effect In Server mode this setting has no effect 7 Server End of Line Filter This setting can turn the filter function ON or OFF If ON then when a CR LF Carriage Return Line Feed character pair is received it is converted to a CR only before it is sent to the serial port output CR LF pairs are normally used in the MS DOS environment to mark the end of a line but may cause problems in other environments CR NULL character pairs are also converted to a CR only 26 Operation e If this setting is OFF then no conversion is done e In Client Mode this setting has no effect 8 Client Local Character Echo If ECHO is ON the client EtherPath will locally echo all incoming characters in client mode If ECHO is OFF the client EtherPa
33. e overridden when in Ethermodem mode by including a port number in the ATD command 18 Operation 6 IP Fragmentation If set to ZERO IP blocks sent from this EtherPath may be fragmented in transit and blocks may be fragmented by the EtherPath If set to ONE the DONTFRAG bit is set in IP packets and all blocks are transmitted intact This is normally set to 0 but is set to 1 for some SCADA applications The default is 0 7 Operational Mode Server and Client modes provide a raw data path and should be selected when two EtherPaths are used in a nailed up configuration This is often named raw sockets mode and is transparent to the data being transported Telnet Server and Telnet Client modes perform Telnet command processing and should be used when an EtherPath is communicating directly with a Host Telnet Client or Server 8 Ethernet Mode The EtherPath ethernet interface may be configured as 10Mbps or 100Mbps half or full duplex or AUTO The default of AUTO is most commonly used If hard configured insure that the hub or switch matches the mode selected 7 TCP Tx Timeout When enabled the local unit will close the connection if it is unable to deliver data to the remote unit The timeout is dependent upon the round trip time but will be in the range of 5 to 12 minutes When disabled the unit will try forever to deliver the data 19 EtherPath User s Guide Main Menu Option 2 Set Manager Telnet IP
34. easonable cost Ethernet Cross Over Cable Used to connect two EtherPath Ethernet connections back to back without using an Ethernet hub for test purposes Also used to connect a EtherPath directly to a PC s LAN connection for testing RJ 45 RJ 45 1 WHT ORG 3 2 ORG WHT 6 3 WHT GRN 1 4 BLU WHT N C 5 WHT BLU N C 6 GRN WHT 2 7 WHT BRN N C 8 BRN WHT N C 75 EtherPath User s Guide Appendix B Programming This Appendix explains the EtherPath s remote programming interface This is not used in most applications The information is for those writing programs to access the EtherPath via the Ethernet Introduction It is rather straightforward to implement a software application to communicate with serial devices through the EtherPath Topics covered in this appendix are e FEtherPath description and behavior e Application notes e Links to sample code In addition to user written software applications there are port redirector software packages that work quite well with the EtherPath If you are not a network programmer then port redirector may be the quickest way to get an application on line For UNIX systems AIX Linux SCO5 FreeBSD OSF Termnet works quite well It is GNU d freeware available from http www dcbnet com or http www linuxlots com 76 Specifications For Microsoft Windows systems Serial IP
35. een TAN STAM KL E per Mod ege SAS Blocked dE EA Eed Flow Control OFF Buffer Level 43 Flow Control ON Buffer Level 43 Line Temmmator Character 43 Transmit_on LT Char 43 Server End of Line Elter 44 Client Local Character cho 44 Keep Alive Frequency LAN Configuration Screen Local IP Address The IP address of this EtherPath device on your LAN The default IP Address is 192 168 1 1 oer 45 Subiet Masks it ast aE ER a mane ees 45 Gateway IP Address 46 If the remote EtherPath in Client Server mode is not on the same LAN then the gateway to the other LAN must be entered ee A0 gedreet covers dias Ethernet Mode Remote Device IP Address 47 Remote Listen IP Port Number 47 IP Fragmentation e Port Nutnber ss eidion agaaa ana IP Fragmentation eeseeeseeseeeeseeseneeseeeeneees 48 TCP Tx Dmeout enrenar tnia 48 SNMP Configuration Sereen 49 Contact Personin sanoni anir i 49 D vice Name 2 EEN 50 Physical Locatton 50 SNMP Community Name 50 Configuration Summary Bereen 51 Chapter 5 LR E EE 52 Client Server Point to Point Nailed Up Mode 52 Server Modereer er Bags teat 54 Client Server Point to Multiple Point EtherModem Mode 54 Client Reverse Telnet Mode Method 1 ATD dial mode Method 2 Hardware Dial mode Ch pter Orscisesscsascssscdsesssesvascevsscsvessseasesesisesvvcssessoswane 59 Configuration Security csccccsccscsssscssssseesceee 59 OVEIVICW eene Seed 59
36. er i eege teats 9 Software Reouremenmts eseese 9 Chapter 2 Installation OVERVIEW ecto ert en ae ee ac LAN Installanon nnii 10 1 Connect the Network Cable c ccceeeeseeee 10 2 Connect the Power Adapter Cable 0 11 3 Connect the Serial Port Deviee 11 Chapter 3 Terminal Telnet Configurration ccccccccscsccsssscsesscseesceee EENEG ele Terminal Configuration Procedure 2c sect Eeer ck Telnet Confeurapon 14 Terminal Telnet Interface 16 Entering Dataene aed cancer nies 16 Menu Optons 17 Main Menu Option 1 Setting IP Addresses nenna eniak 17 1 Local IP Address 18 2 Remote IP Address 18 3 Gateway IP Address 18 4 Subnet Mask 18 5 Port Number 18 6 IP Fragmentation eee eeeseeseeeeseeeeneeeeeees 19 7 Operational Mode 19 8 Etheret Mod er serenana anri 19 Te KS GEN Kon EE 19 Main Menu Option 2 Set Manager Telnet IP Address 20 Main Menu Option 3 Set Serial Port Data 21 ii Introduction Baud Rate Ait EE Data Bits Stop Bits Pin Contrat sciveasesczaciveeavenciciaitenstencetes 22 Diall Mode cet cosioetactnttertecventennds RS 485 Mode Main Menu Option 4 Advanced Configuration Screen 24 1 Transmit Tmmer 25 M Timer Mode 25 DQ Block tee sooni aei ken ais 25 3 Flow Control OFF Buffer Level 25 4 Flow Control ON Buffer Level 26 5 Lme Termunator Character 6 Transmit_on LT Char 7 Server End of Line Filter
37. es NOT include the parity bit The two most common settings are 7 bit PLUS appropriate parity or 8 bit with NO parity Default is 8 bits Stop Bits The choices are 1 or 2 Commonly use 1 Pin 6 Control If Forced On the EtherPath responds as if interface pin 6 is always high If From Interface its condition is a read from the RS 232 cabling must be correct for proper operation Dial Mode The choices are ATD or Hardware This configures the EtherPath when in client mode to connect to a remote device when it receives an asserted hardware pin 6 signal or when it receives 22 Operation an ATD command For a full time Nailed up connection use Hardware See Chapter 5 Point to Multiple Point Mode for use of the AT setting RS 485 Mode Select between 4 wire full duplex and 2 wire half duplex RS 485 mode For RS 485 operation the hardware jumpers inside the unit must be moved from the RS232 to the RS485 position This setting is ignored when using RS 232 23 EtherPath User s Guide Main Menu Option 4 Advanced Configuration Screen Selecting 4 from the Main Menu will display the following ADVANCED CONFIGURATION Transmit Timer 10 ms Mode IDLE TIMEOUT Block Size 512 Bytes Flow OFF Buffer Level 80 Flow ON Buffer Level 20 Line Terminator Character 13 Dec Transmit on LT Char OFF Server End of Line Filter ON Client Local Character Echo OFF Keep Alive Frequency 0 seconds
38. fig Summary Serial Port Bytes received 0 Port Activity s EEN Bytes transmitted 0 Document Done Figure 4 Port Activity Screen 3 3a J This screen displays details about the data currently being transmitted or received either through the LAN or Serial port The display is updated every 10 seconds Data Network The IP Address of the remote to device to which this EtherPath is currently connected Number of packets received by the EtherPath through the LAN connection including management screen packets 40 Operation Number of packets transmitted by the EtherPath Transmitted through the LAN connection including management screen updates Packet Errors Number of packets containing errors transmitted or received by the EtherPath through the LAN connection Under normal conditions this should be 0 Data Serial Port Bytes Number of Bytes received through the serial Received RS232 connection from the Serial port device Number of Bytes transmitted through the serial RS232 connection to the Serial port device or E GF in Client imode ais SZ Go Ee F asa 2 k BIB Looms Lra Lod Ze Poewe Larr Lors net Mat Pras Lsd Lae Ame crouns Advanced Configuration ETE mae Figure 5 Advanced Configuration Screen 41 EtherPath User s Guide The EtherPath has a built in buffer to store data Most of these settings affect the operation of the buffer and how d
39. he IP address of the remote Server device which this client will automatically connect to when powered up if RS 232 PIN 6 is high or forced and configured for hardware dialing This is also the default server that will be used for AT dialing when in PMP mode In Server mode this value is not required and will be ignored Remote Listen IP Port Number This is the TCP IP port number the EtherPath listens on when in server mode The default is port 3000 When in client mode this is the port on the remote server that a connection is attempted with This value may be overridden when in Ethermodem mode by including a port number in the ATD command See Appendix B for a discussion of the sending IP port number IP Fragmentation If set to ZERO IP blocks sent from this EtherPath may be fragmented in transit and blocks may be fragmented by the EtherPath If set to ONE the DONTFRAG bit is set in IP packets and all blocks are transmitted intact This is normally set to 0 but is set to 1 for some SCADA applications The default is 0 Port Number This is the TCP IP port number the EtherPath listens on when in server mode The default is port 3000 When in client mode this is the port on the remote server that a connection is attempt with This value may be overridden when in Ethermodem mode by including a port number in the ATD command 47 EtherPath User s Guide IP Fragmentation If set to ZERO IP blocks sent f
40. iguration mode and is used only when configuring the EtherPath via the serial port as explained in Chapter 3 Configuration Return from configuration mode by exiting the configuration menu or by power cycling the unit This switch may be depressed with a tiny screw driver or stiff wire A straightened paper clip works nicely Pressing the switch does not return the unit to factory defaults To return to factory defaults use any configuration method and select Set To Defaults as the command EtherPath User s Guide LED Indicators There are three LED indicators on the top panel e The leftmost LED indicates the unit s current mode Solid Server Off Client Flashing Setup Condition e The second LED indicates the status of the LAN interface If it is on there is a valid LAN connection Off indicates no LAN connection and flashing indicates activity on a valid lan connection A valid LAN connection means a connection from another EtherPath or some other device not merely being plugged into a hub or switch e The right most LED flashes along with activity on the RS 232 port Introduction Package Contents You should find the following items packaged with your EtherPath e The EtherPath Unit e Power Adapter typical e This User s Guide If any of the above are missing contact your dealer immediately Software Requirements The EtherPath supports the following protocols e TCP IP e UDP e ARP e
41. in 6 Dial the EtherPath connects to the remote device upon power up If configured for AT Dial and From Interface the input must be asserted before the AT Dial command will create a connection On units configured as a server DTR must be high before an incoming connection will be established 72 Specifications RTS Output Input flow control When the internal buffer reaches the Flow Off buffer level this signal is lowered When the buffer level decreases to the Flow ON buffer level this signal is raised CTS Input When Flow Control is set for CTS RTS lowering this signal will halt data flow from the EtherPath RS 232 port Ring Indicator Not used 73 EtherPath User s Guide CABLES Commonly used cable connections To PC 9 pin COM port 1 PC 16 4 2 3 d en 2 4 16 5 5 7 8 8 I This is a relatively common null modem PC crossover cable SR Mux Composite or Access Switch Input Port RJ 45 DE 9S 1 BLU N C 2 ORG N C 3 BLK 4 1 6 4 RED 5 5 GRN 2 6 YEL 3 7 BRN 8 8 WHT 7 74 Specifications SS 1 to Modem Use any commercially available PC to modem cable Specialty Cables For special devices RTUs POS terminals etc contact technical support or check the DCB web site technical support section DCB will assist in designing special cables at no cost or provide proven cable solutions at a r
42. ith several levels of security configuration and authentication These restrict the ability of an unwanted user from changing the configuration of the EtherPathl They do not restrict the ability of a remote device to deliver packets to the EtherPath s data port Before starting configuration security you should be familiar with the information in chapter 5 Main Menu Option 9 SNMP Configuration Selecting 9 from the Main Menu will display the SNMP configuration screen SNMP CONFIGURATION Name of Contact Person Supervisor Device Name GW0000B0 Physical Location Head Office SNMP Community public SET SNMP CONFIGURATION 1 Name of Contact Person 2 Device Name 3 Physical Location 4 SNMP Community 0 Return to previous menu Enter Command gt 33 EtherPath User s Guide Contact Person This text field can be used to store the name of the person responsible for the Serial Port Device Device Name This can be used to store a descriptive name for the device Physical Location This can be used to store he location of the device SNMP Community The SNMP community name Default is public Main Menu Option 0 Exit without Saving Selecting 0 from the Main Menu will exit the configuration program without saving any data you have entered If you changed the IP address this will force the unit to restart using the new address 34 Operation Chapter 4 Browser Configuration This Chap
43. ive time seconds if there is no data to send 10 The Server Mode EtherPath will disconnect the link if it does not receive any packet from the Client Mode EtherPath within a period of three times the keep alive time 11 The Server Mode EtherPath will then initialize and accept a new connection The Client Mode EtherPath will attempt to reconnect as soon as a network path becomes available 12 User written programs can avoid this operation by setting the keep alive time to zero If a user written program uses the EtherPath keep alive the program must handle the keep alive packet properly 79 EtherPath User s Guide Application Notes There are a number of application notes available from the DCB web site at http Awww dcbnet com These cover port redirection selecting the proper product EtherPath vs EtherPoll SNMP middleware for the EtherPath a demonstration client server software system and other issues A complete copy of the SNMP MIB is available from the same site along with a free port redirector program along with source code for various UNIX workstations A trial port redirector program for Windows is also available A demonstration program for a Windows workstation is printed in the next section These and more are available in the Education section of that web site 80 Specifications Appendix C AT Command Summary This Appendix explains the EtherPath s AT command se
44. l Chapter 1 Introduction This chapter provides an overview of the EtherPath s features and capabilities C ongratulations on the purchase of your new EtherPath The EtherPath is a versatile product that enables serial communications devices to operate via Ethernet It is designed to easily connect a serial port device to your network A remote PC or other serial device can then be used to monitor configure manage and send or receive data to the serial port device through the LAN WAN The EtherPath can receive data from any Serial device convert the data to a valid IP packet and transmit that data over the LAN WAN Serial devices can then be accessed from anywhere on your LAN WAN by any workstation computer running telnet dedicated software or COM port redirection software Two EtherPaths may be used in nailed up mode to build a RS 232 path through the WAN LAN Multiple EtherPaths may be connected via Ethernet by using them in Point to Multiple point AT Dial mode Some serial port devices in common use are Bar Code Readers UPSs SCADA RTUs security alarms access control devices time clocks POS terminals and multiplexers For easy connection to your LAN the EtherPath supports both 10BaseT and 100BaseT connections EtherPath User s Guide EtherPath Functions The EtherPath can be used in several modes simple Client Server or Server as illustrated below point to multiple point EtherModem Clien
45. lt address is 3000 for normal operation and 8000 for configuration Is there a firewall in the Ethernet path If so it must be configured to pass the ports in use by the EtherPath Many trouble calls are the result of firewall changes that block the EtherPath ports Are you trying to connect to the EtherPath data port with a web browser That only works for configuration on port 8000 Web Browsers often are configured to use a proxy server The browser might need to be configured to NOT use the proxy when connecting to the EtherPath or the proxy server may be configured to pass the requests correctly MOST EtherPath connection problems are due to incorrect RS 232 wiring The second most common errors are incorrect IP addressing on either the EtherPath or on the PC used for testing 66 Troubleshooting Other Problems P1 Can t run the configuration program using a serial cable connection S1 Check that e You did press the configuration button e The communication parameters are set properly e Disconnect and reconnect the power supply to the EtherPath e Power is available a LED is on e The most common problems causing this symptom are incorrect RS 232 wiring or the Windows Hyperterm program not operating correctly P2 The Client EtherPath doesn t automatically connect to the Server EtherPath S2 Check that e One unit is configured as a client the other as a server For trou
46. o Defaults button will restore ALL values to their factory default values When this is done the EtherPath will reboot and the existing connection will be lost You must reconnect using the default IP Address of 192 168 1 1 51 Chapter 5 Operation This Chapter explains how to use the EtherPath once it is installed and configured Although it may be used with automated equipment such as RTUs POS or other computer based devices the example configurations shown in this chapter use terminals or terminal emulation on a PC for illustrations It is often useful to set up the EtherPath using this method before connecting other equipment Client Server Point to Point Nailed Up Mode Both EtherPaths must be correctly installed and configured as described in Chapters 3 or 4 One serial port device is connected to the Server EtherPath and another serial device is connected to the Client EtherPath One EtherPath has the operational mode set as a Server the other has the operational mode set as a Client The communication settings for the serial devices must be the same as the values entered into the EtherPath device they each attach to Power up the server EtherPath Power up the client EtherPath It will automatically connect to the remote EtherPath whose IP address was stored during 52 Operation configuration if hardware dialing is enabled and pin 6 is asserted You may now proceed as if the rem
47. o the other LAN must be entered here Mode Server and Client modes provide a raw data path and should be selected when two EtherPaths are used in a nailed up configuration This is often named raw sockets mode and is transparent to the data being transported Telnet Server and Telnet Client modes perform Telnet command processing and should be used when an EtherPath is communicating directly with a Host Telnet Client or Server Ethernet Mode Although most often used in auto configure mode the EtherPath may be forced to 10Mbps 100Mbps half or full duplex This option is useful when connected to a switch that is very slow powering up The EtherPath powers up fairly quickly and may be forced to a compatible mode to prevent it from negotiating an invalid configuration with a hub or switch that isn t initialized to negotiate Administrator Access Rights If the entries are blank then any user on the LAN may configure the EtherPath If you are not sure about using this feature leave the addresses all zeros This screen shows a table containing four 4 entries By default all entries are blank These entries provide a security feature Only a user at one of the IP addresses shown can configure the EtherPath All users on the LAN can still access the EtherPath but not configure it Read the security chapter before implementing this feature 46 Operation Remote Device IP Address In Client mode this is t
48. of the EtherPath and accessed through a small hole Use a small pen or paper clip to access the switch 3 Start the terminal program and configure the terminal program with the following settings Setting Wes Flow control protocol 9600 4 Connect your terminal program to the appropriate port e g COM 1 13 EtherPath User s Guide 5 The configuration program should now start and after a few seconds display a sign on screen If nothing appears on your screen press the Enter key Refer to Terminal Telnet Interface on page 16 for details on using the configuration program Telnet Configuration 1 Install the EtherPath into your LAN as described in Chapter 2 Ensure that the EtherPath is powered on The EtherPath must have an IP address appropriate for YOUR network 2 Connect to the EtherPath with your telnet program An example command might be telnet IP Address Port number Where IP_Address is the IP address of the EtherPath Port_number for configuration is 8000 For example if the default IP address had not been changed then you would enter the command telnet 192 168 1 1 8000 14 Operation 3 Refer to the following section for details on using the configuration program 15 EtherPath User s Guide Terminal Telnet Interface The Signon screen displays the version number EtherPath V5 3 Device Name GW0000B0 Physical Location Head Office Operational Mode S
49. on port number configured in the remote telnet server The EtherPath will automatically connect to the remote telnet server If an address or port number isn t given the values stored during configuration are used See the Appendix for a complete list of AT commands and responses If the EtherPath is in Client Echo mode you should see the message Connect OK from the client mode EtherPath when the connection is established You may now proceed as if the remote telnet server was connected to the serial port of your workstation Disconnect from that remote telnet server with either the command or by lowering the hardware lead on pin six 57 EtherPath User s Guide Method 2 Hardware Dial mode This mode operates with the Hardware dial Pin 6 setting In this mode the EtherPath connects to the configured IP address as soon as RS 232 pin 6 is asserted The EtherPath must be configured for Hardware Pin 6 dialing and dip switches set for client Start the Terminal emulation program or use a real terminal The communication settings for this device must be the same as the values entered into the Client EtherPath device earlier Power up the local EtherPath The EtherPath will automatically connect to the remote telnet server using the values stored during configuration If the EtherPath is in Client Echo mode you should see the message Connect OK from the client mode
50. ote serial port device was directly connected to the serial port of your local serial device If Pin 6 control is set to From Interface then the serial device must provide a high level signal on pin 6 before the EtherPath will accept or place an Ethernet connection 53 EtherPath User s Guide Server Mode e Install and connect the EtherPath and Serial Port Device as described in Chapters 3 and 4 e Am PC or workstation on the LAN WAN should now be able to use Telnet to connect to the Serial Port Device with the command telnet IP Address Port number Where IP_Address is the IP address of the EtherPath and Port number is the configured value default value is 3000 For example if the default IP address and port number have not been changed and they are appropriate for your network then you would enter the command telnet 192 168 1 1 3000 e You should see a Connected message from the telnet client when the connection is established Some telnet clients don t display this message e You may now proceed as if the remote serial port device was connected to the serial port of your PC or workstation e If there is a firewall in the link between the EtherPath and your workstation you may need to configure it to pass packets using the port number configured into the EtherPath Client Server Point to Multiple Point EtherModem Mode e EtherModem mode requires multiple EtherPaths configured in Server
51. p 1 Bit Pin 6 Control FORCED ON Client Dial Mode HARDWARE Pin 6 RS485 4 wire Jumpers set for RS232 ADVANCED CONFIGURATION Transmit Timer 20 ms Mode TRANSMIT TIMER Block Size 512 Bytes Flow OFF Buffer Level 80 Flow ON Buffer Level 20 Line Terminator Character 13 Dec Transmit on LT Char OFF 28 Operation Server End of Line Filter OFF Client Local Character Echo OFF Keep Alive Frequency 0 seconds CURRENT ETHERPATH STATISITCS Network packets received 12 Network packets transmitted 8 Network packet errors 0 Port bytes received 4 Port bytes transmitted 0 CURRENT ETHERPATH CONFIGURATION SERVER Mode Connected to IP Address NO ACTIVE CONNECTION Press any key to continue Note that no data can be changed Pressing any key from the above screen will return you to the Main Screen All data items except the following have been explained on the preceding pages Current Statistics Network Packets Received Number of packets received by the EtherPath through the LAN connection Network Packets Transmitted Number of packets transmitted by the EtherPath through the LAN connection Network Packet Errors Number of packets received through the LAN connection which contained errors Port Bytes Received Number of Characters received through the serial RS232 connection 29 EtherPath User s Guide Port Bytes Transmitted Number of Characters transmitted
52. rom this EtherPath may be fragmented in transit and blocks may be fragmented by the EtherPath If set to ONE the DONTFRAG bit is set in IP packets and all blocks are transmitted intact This is normally set to 0 but is set to 1 for some SCADA applications The default is 0 TCP Tx Timeout When enabled the local unit will close the connection if it is unable to deliver data to the remote unit The timeout is dependent upon the round trip time but will be in the range of 5 to 12 minutes When disabled the unit will try forever to deliver the data This is normally used in the default enabled mode It is sometimes turned off to operate better with satellite Internet provider TCP ACK spoofing 48 Operation SNMP Configuration Screen Lialx m ych linus d Hamaj z DRUDGE Pricing ratsch Hir gf LinxDalyflows Met SNMP Configuration Contact Person Buperseor Device Nams GwO00080 Physical Location Heed Office SIME Conmnnity public E ee eae ow P ek Figure 7 SNMP Configuration Screen Overview This screen may be ignored if SNMP is not used These are text fields commonly used in SNMP Simple Network Management Protocol Programs to identify this device when browsing the network Other standard MIB values are returned to the SNMP manager along with this information Contact Person This text field can be used to store the name of the person responsible for
53. ry Port Activity y Se EZ A done Polat 2 The first screen is similar to Figure 2 Figure 2 Sign on Screen e Use the menu bar on the left to navigate to the desired screen e On line help is available on each screen e Fach screen is explained in the following sections 37 EtherPath User s Guide Port Configuration Screen G2 A Ses a Figure 3 Port Configuration Screen This screen allows you to change the settings for the RS232 link The settings used should match the device connected to the serial port of the EtherPath Note that the EtherPath s serial settings must match the device that is plugged into THAT EtherPath The device at the other end of the Ethernet link may be set differently Flow Control The choices are None XON XOFF and RTS CTS It is common to use NONE for installation troubleshooting then set it correctly to match the connected device If RTS CTS is used the RS 232 cables must have handshake lines wired correctly RTS Toggle is a handshake mode commonly used with half duplex modems The RTS output is asserted when the unit has data to 38 Operation transmit and it will remain asserted for approximately Sms after the last character has been transmitted The CTS signal controls output flow Baud Rate Speeds between 300 bps and 230 4Kbps are supported Parity The choices are None Odd or Even Da
54. s setting is ON any data in the buffer will be sent immediately upon receipt of a Line_Terminator_Character see 43 EtherPath User s Guide previous setting When the setting is OFF the Line_Terminator_Character has no effect In Server mode this setting has no effect Server End of Line Filter This setting can turn the filter function ON or OFF If ON then when a CR LF Carriage Return Line Feed character pair is received it is converted to a CR only before it is sent to the serial port output CR LF pairs are normally used in the MS DOS environment to mark the end of a line but may cause problems in other environments CR NULL character pairs are also converted to a CR only e If this setting is OFF then no conversion is done e In Client Mode this setting has no effect Client Local Character Echo If ECHO is ON the client EtherPath will locally echo all incoming characters in client mode If ECHO is OFF the client EtherPath will not echo characters or transmit any status messages to the serial port This mode should be used if any messages from the EtherPath would create interference OFF is the most commonly used value Keep Alive Frequency Setting this value to a non zero value will enable a Keep Alive feature in the unit When the unit is in Client or Telnet Client mode It will send Keep Alive messages to the server at the specified frequency if there is no other traffic on the link The
55. t Server and reverse telnet Client These modes are described below Client Server Mode Figure 1 Modes of Operation Client Server Mode In this mode two EtherPaths are used Both are connected to serial RS 232 devices This is termed a Nailed Up connection e The Client EtherPath will automatically establish a connection to the Server EtherPath upon power up e The device on one EtherPath communicates with the other serial port device as if it was directly connected via a serial port cable Introduction e The EtherPaths and the LAN are completely transparent to PC application and serial port device Server Mode This mode requires only a single EtherPath The EtherPath is connected to the serial port device and to the LAN Users on the LAN can then connect to the serial port device and communicate with it via Telnet using any assigned IP and port address Most LAN connected workstations provide support for communication via Telnet A special purpose utility program or port redirector program may be used instead of Telnet or the user may create custom software using Visual Basic C or other network programming tools By using port redirection the EtherPath may function as a remote serial port on a PC Point to Multiple Point EtherModem Mode Point to multiple point EtherModem operation allows a single EtherPath running in client mode to connect to multiple server mode EtherP
56. t operation and responses The EtherPath recognizes the following AT commands when AT Dialing is enabled ATD lt IP gt ATDT lt IP gt ATH 0 1 ATO 0 1 ATE 0 1 ATSO 0 1 ATV O 1 ATZ AT amp W AT amp Z connect to lt IP_address gt connect to lt IP_address gt on off hook ATH lt cr gt ATHO return to data mode from command mode if connected echo off on ATE lt cr gt ATEO switch to Client 0 or Server 1 mode if not connected terse verbose response ATV lt cr gt ATVO reset EtherPath DOES NOT restore factory defaults save current settings including ATE and ATV reset EtherPath Same as ATZ escape to command mode when connected 81 EtherPath User s Guide AT Command Responses The serial port responses depend on the ATE setting Verbose Terse OK 0 CONNECT 1 CARRIER 3 ERROR 4 BUSY 7 AT Command Operation When ATE1 is in effect there are some addition error messages such as Invalid IP address and Invalid Entry The ATE and ATV settings are saved in non volatile memory when the AT amp W command is entered and those settings are restored when the EtherPath is reset The Factory Default setting main menu option 6 for both is ON Connections are only allowed when Pin 6 is HIGH or FORCED HIGH If not FORCED HIGH the Pin 6 can be used to drop a connection One can also use then ATH lt cr gt to drop a connection Specifications Appendix D RS 42
57. ta Bits The choices are 7 or 8 This does NOT include the parity bit The two most common settings are 7 bit PLUS appropriate parity or 8 bit with NO parity Stop Bits The choices are 1 or 2 Commonly use 1 Dial Mode The choices are ATD or Hardware This configures the EtherPath when in client mode to connect to a remote device when it receives an asserted hardware pin 6 signal or when it receives an ATD command For a full time Nailed up connection use Hardware See Chapter 5 Point to Multiple Point Mode for use of the AT setting RS 485 Mode Displayed only if jumpered for RS 485 Select between 4 wire full duplex and 2 wire half duplex RS 485 mode For RS 485 operation the hardware jumpers inside the unit must be moved from the RS232 to the RS485 position This setting is ignored when using RS 232 39 EtherPath User s Guide Port Activity Screen G Port Activity Netscape Ele Edit View Go Communicator Help d gt 3 Aa D sg D 3 LN Back fowsd Reload Home Seach Netscape Pint Security Shop Sic Bookmarks E Location http 205 186 54 213 mon htm E IntemalHome D ATAT Stats H Dogpile E txquick H Googe DRUDGE icing H Network Monitor E Testing old Port Activity Configure Port Network Current Connection IP Address NO ACTIVE CONNECTION Advanced Config Packets received 5 Configure LAN Packets transmitted a Configure SNMP Packet ears o Con
58. ter describes how to configure the EtherPath using a Web Browser The EtherPath must have an IP address appropriate to your network before using this method Overview This configuration method uses your Web Browser to configure the EtherPath This provides the most user friendly interface than the Telnet Terminal method e The EtherPath must be installed in your LAN before this configuration method can be used Most Browsers will work The only requirement is that they support HTML tables and forms Connection Procedure To establish a connection to the EtherPath follow this procedure Install the EtherPath in your LAN as described in Chapter 2 Ensure that the EtherPath is powered on Start your Web browser Nn In the Address box enter the following http IP Address EtherPath User s Guide IP_Address is the IP address of the EtherPath For example http 192 168 1 1 6 Once connected you will see the first screen Refer to the following section for details on using the Web based interface 36 Operation eb based Interface GC Ee Edt View Go Bookmarks Tools Window ek Z Serre Janaj 2 D Ae wbBookmarks internal Home 2 Dogpile ixquick Googe PORUOGE Pricing Protocols Bidding A LinuxDalyNews Net Alexa Web Search 4 Linux It EtherPath Setup Configure Port P Client Server Mode Advanced Config Configure LAN Confiqure SNMP Config Summa
59. th will not echo characters or transmit any status messages to the serial port This mode should be used if any messages from the EtherPath would create interference OFF is the most commonly used value 9 Keep Alive Frequency Setting this parameter to a non zero value will enable a Keep Alive feature in the Unit When the Unit is in Client or Telnet Client mode it will send Keep Alive messages to the server at the specified frequency when the link between the client and server is idle When the Unit is in Server or Telnet Server mode it will close the connection if the link is idle for more than 3 5 times the Keep Alive Frequency 0 OFF 1 32767 seconds 27 EtherPath User s Guide Main Menu Option 5 Display Settings Selecting 5 from the Main Menu displays a screen like the following example LOCAL UNIT CONFIGURATION Local Address 205 166 54 216 Serial NO 00 09 AA 00 00 BO Remote Address NOT SET Gateway Address NOT SET Subnet Mask 2593200020000 Server Mode Listen on Port 3000 IP Fragmentation ALLOWED Ethernet Mode Auto TCP Tx Timeout ENABLED SNMP CONFIGURATION Name of Contact Person Supervisor Device Name GW0000B0 Physical Location Head Office SNMP Community public MANAGER CONFIGURATION Entry Manager IP Addr KKK KK KKK KKK KE KKKK KKK de 0 0 0 0 2 0 0 0 0 3u 0 0 0 0 4 0 0 0 0 PORT CONFIGURATION Flow Control NONE Baud Rate 9600 Data 8 Bits Parity NONE Sto
60. upon the port speed and should be several character times Allowable values range from Ims to 10 000msec 10 seconds A typical value for a 9 6 Kbps port is about 3 msec M Timer Mode When set to 0 the timer is a free running clock and if there is data in the buffer an IP packet is transmitted every TIMER msec When set to 1 the timer is a serial port idle time value If there is data in the buffer and the serial port has been idle for TIMER msec then an IP packet is transmitted 2 Block Size The maximum ethernet packet buffer size The minimum value is 1 byte the maximum 4096 bytes 4 K Typical values are either in a low range of 10 20 characters for polling applications or very large in the range of 500 to 1500 for file transfer applications Normally the timer triggers a packet transmission before the block fills If the buffer contains BLOCKSIZE characters an IP packet is transmitted regardless of the timer mode and settings 3 Flow Control OFF Buffer Level If the amount of data stored in the buffer reaches this point and the EtherPath is unable to transmit the data then no further input will be accepted 25 EtherPath User s Guide Under normal operation this will not happen This is normally left at the default value 4 Flow Control ON Buffer Level Once the High Water mark has been reached the no input accepted mode will continue until the EtherPath has transmitted enough data to reduce th

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