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ENET-232 Series and ENET-485 Series User Manual for Windows

1. 3 Locate the bias resistors Figure 6 4 shows the bias resistors as black rectangles and circles Each port has four bias resistors EYTT S aeee O ITS g ommo cmmcommoce o ommcemme ommoomme O o R el 200000000000 i O t T ORO pean ome i a00000000000 l O00 O n co o CoC ae a O H O i 1000001 ry ial E 00000000 oro jpe co J OU aD i O i C h dp oh oF Oh A a m n gii OO Oo ob qo To C ool SE U 4 oloo a a Install new resistors that are trimmed to fit in the sockets four screws ENET 232 and ENET 485 for Windows NT 4 0 Figure 6 4 Location of Bias Resistors Remove the bias resistors by gently lifting them out of the sockets Slide the top cover backwards over the baseplate and reinstall the www ni com Uninstalling the Software This appendix describes how to uninstall your NI Serial server software 1 Select Start Settings Control Panel 2 Double click the Add Remove Programs icon A dialog box appears with a list of the software you can uninstall Add Remove Programs Properties Install Uninstall Windows NT Setup e To install a new progr
2. Straight through cable for connecting the serial device server to a network hub Cross over cable for connecting the serial device server directly to a computer s network interface card NIC 3 5 in high density 1 44 MB disk kit for NI Serial Server Software for Windows NT which is included in your kit Optional Equipment For information about ordering the following optional equipment contact National Instruments DB 9 RS 485 termination connector ENET 485 only RS 232 9 pin to 9 pin straight through cable RS 232 9 pin to 9 pin null modem cable RS 232 9 pin to 25 pin null modem cable ENET 232 and ENET 485 for Windows NT 4 0 1 2 www ni com Chapter 1 Introduction Serial Device Server Overview Serial Port Overview The ENET 232 and ENET 485 serial device servers give you a variety of solutions for serial communication The serial device servers are available in a two port version ENET 232 2 and ENET 485 2 and a four port version ENET 232 4 and ENET 485 4 The ENET 232 works with the RS 232 protocols and the ENET 485 works with the RS 422 and RS 485 protocols You can use the ENET 232 for point to point serial communication up to distances of 15 6 m 50 ft per serial port You can connect the ENET 485 for multidrop serial communications with up to 31 devices using serial cable lengths up to 1 2 km 4 000 ft per serial port The serial ports on the ENET 232 are DTE In the RS 232 specification
3. data problems sending or receiving C 4 DB 25 connector D 8 pin descriptions table D 8 pin locations figure D 8 DB 9 pin descriptions table D 7 pin locations figure D 7 DCE vs DTE D 6 default configuration resetting 2 5 6 4 default hostname location 2 2 determining firmware version C 7 physical port associated with a COM port C 8 software version C 7 ENET 232 and ENET 485 for Windows NT 4 0 Index development tools for saving time 1 6 DeviceloControl 6 8 input values table 6 9 setting transceiver mode with 6 8 DHCP configuring network settings automatically 2 4 configuring network settings without DHCP 2 5 3 1 confirming its availability 2 4 if DHCP does not configure network parameters C 1 registering hostname and IP address 3 5 risks for failure 6 2 using 6 2 using with DNS 6 2 C 2 DHCP failure communication failure between DHCP and DNS 6 2 if no IP addresses available 6 2 diagnostic messages could not connect to serial device server C 6 could not directly access the serial port C 7 could not locally access the serial port C 7 environment is not configured properly C 5 error reading registry C 5 failed to open network connection C 5 required file is missing C 5 serial device server refused request C 6 diagnostics utility See Serial Device Server Diagnostics utility DNS registration 3 5 using with DHCP 6 2 C 2 DNS server 3 7 ENET 232 and ENET 485 for Wind
4. Add the serial device servers you wish to use with your system as described in the Adding a New Serial Interface section in Chapter 4 Serial Port Configuration 3 Reboot your computer for the new registry settings to take effect Failed to open network connection This error message occurs if the Serial Device Server Diagnostics utility detected a problem with your computer s network connection Complete the following steps 1 Verify that you have a Network Interface Card NIC properly installed in your computer 2 Verify that the TCP IP protocol is properly configured on your computer a Select Start Settings Control Panel Network b Select the Protocols tab National Instruments Corporation C 5 ENET 232 and ENET 485 for Windows NT 4 0 Appendix C Troubleshooting and Common Questions c Double click TCP IP Protocol in the Network Protocols list 3 Note If TCP IP Protocol is missing from the list click Add select TCP IP Protocol from the list of available protocols and then click OK d Verify that each of the network settings listed in the Microsoft TCP IP Properties window matches the settings recommended by your network administrator Could not connect to Serial Device Server This error message occurs if a problem is encountered while attempting to communicate with the serial device server Confirm the serial device server is turned on Make sure the serial device server is properly configured Refer
5. National Instruments Corporation 4 5 ENET 232 and ENET 485 for Windows NT 4 0 Verify the Installation This chapter describes how to verify the installation of your serial device server and the NI Serial server software Running the Serial Device Server Diagnostics To verify the hardware and software installation run the Serial Device Server Diagnostics utility Select Start Programs National Instruments Serial Server Diagnostics The following screen appears The status window is empty until you press Start Serial Device Server Diagnostics x Welcome to the National Instruments diagnostic utility for the Serial Device Servers Before you begin the test disconnect the cables from all the serial ports and close all applications that access the ports Then click Start Pott Pass Fail Reason Figure 5 1 Serial Device Server Diagnostics Utility Before Test National Instruments Corporation 5 1 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 5 Verify the Installation When you click Start the diagnostics utility verifies the following e The NI Serial server software is installed properly e The configuration of your hardware does not conflict with anything else in your system e The NI Serial server software can communicate with your serial device server correctly If the test is successful your serial device server and NI Serial server software are installed properly Figure 5 2 shows the results o
6. confirming proper settings C 3 general port settings COM port number 4 5 transceiver mode 4 5 general programming requirements 6 1 getting started 1 2 glossary G 1 H half duplex D 4 half duplex system figure D 4 hardware problems cannot open port C 4 cannot send receive data C 4 Ethernet LEDs flash in unison C 4 PWR RDY LED continues to flash C 4 National Instruments Corporation l 3 Index PWR RDY LED is red C 4 scrambled data C 4 unit does not power on C 3 hostname default hostname 2 2 determining 6 5 determining hostname for any IP address C 2 fixing verification error 3 9 problem accessing device C 2 registered with DNS C 2 using for identify device 6 3 verifying 3 8 viewing or changing 3 5 humidity operating and storage E 1 installation getting started 1 2 verification 5 1 installing bias resistors on ENET 485 6 11 NI Serial server software 2 1 setup program figure 2 1 serial device server 2 2 IP address acquiring automatically using DHCP 2 4 assigning manually 3 2 choosing a static IP address 3 7 defined 3 7 determining 6 5 static IP address 6 3 IP address assignment if error message 2 5 if failed 2 5 if not successful 2 5 if successful 2 4 IP parameters DNS server 3 7 ENET 232 and ENET 485 for Windows NT 4 0 Index gateway IP 3 7 if assigned by network administrator 3 7 if assigned by user 3 7 IP address 3 7 static IP p
7. of jumper settings and connector pinouts e Application Notes A library with more than 100 short papers addressing specific topics such as creating and calling DLLs developing your own instrument driver software and porting applications between platforms and operating systems National Instruments Corporation F 1 ENET 232 and ENET 485 for Windows NT 4 0 Appendix F Technical Support Resources Software Related Resources Instrument Driver Network A library with hundreds of instrument drivers for control of standalone instruments via GPIB VXI or serial interfaces You also can submit a request for a particular instrument driver if it does not already appear in the library e Example Programs Database A database with numerous non shipping example programs for National Instruments programming environments You can use them to complement the example programs that are already included with National Instruments products Software Library A library with updates and patches to application software links to the latest versions of driver software for National Instruments hardware products and utility routines Worldwide Support National Instruments has offices located around the globe Many branch offices maintain a Web site to provide information on local services You can access these Web sites from www ni com worldwide If you have trouble connecting to our Web site please contact your local National Instrumen
8. 3 Rear Panel of a Four Port Serial Device Server for an illustration of its location This switch performs two functions depending on whether you press it at power on or during operation Using the CFG RESET Switch during Operation While the serial device server is operational as indicated by a steady yellow PWR RDY LED you can use the CFG RESET switch to place the box into network configuration mode This special mode ensures that network parameters are not changed while in use Hosts cannot connect to the serial device server while it is in network configuration mode 3 Note Pressing the CFG RESET switch has no effect if hosts are currently connected Close all connections then press and hold the CFG RESET switch and wait approximately three seconds until the PWR RDY LED becomes solid red If you release the switch prior to three seconds the serial device server continues to operate normally National Instruments Corporation 6 3 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 6 Using Your Serial Device Server The PWR RDY LED goes through the following changes during these three seconds 1 The LED begins slowly alternating between red and yellow 2 The alternating pattern increases in tempo 3 At three seconds the PWR RDY LED becomes steady red This indicates the serial device server is ready to enter network configuration mode 4 Nowrelease the CFG RESET switch The PWR RDY LED alternates rapidly between
9. 4 0 6 4 www ni com Chapter 6 Using Your Serial Device Server Updating the Firmware The NI Serial server software contains a firmware update utility you can use to access new features that may be added to the serial device server in the future It may be necessary to update the firmware to take advantage of these new features You need to know either the IP address or hostname of your serial device server before you run the NI Ethernet Device Firmware Update utility If you do not remember this information first run the NI Ethernet Device Configuration utility by selecting Start Programs National Instruments Serial Server Ethernet Device Configuration Refer to Chapter 3 Ethernet Configuration for more information ay Note The NI Ethernet Device Firmware Update utility cannot update the firmware while any network connections are active Close any open connections before you attempt a firmware update Hosts cannot connect to the serial device server while it is updating the firmware Complete the following steps to run the NI Ethernet Device Firmware Update utility 1 Select Start Programs National Instruments Serial Server Firmware Update gt NI Ethernet Device Firmware Update x IP address or hostname po o EEPROM binary image filename Browse Update Progress Current status Update Exit Figure 6 1 NI Ethernet Device Firmware Update Utility National Instruments Co
10. B 2 technical support resources F 1 telephone support F 2 temperature operating and storage E 1 terminating a transmission line D 5 termination multidrop network using terminating resistors figure D 5 time saving development tools Bridge VIEW 1 6 LabVIEW 1 6 Lookout 1 6 Measurement Studio 1 6 transceiver control modes table 6 7 transceiver mode 4 5 configuring 6 6 setting with DeviceloControl 6 8 transmission line using bias resistors figure 6 10 troubleshooting C 1 common questions C 7 National Instruments Corporation l 7 Index diagnostic messages C 5 hardware problems C 3 network problems C 1 two wire devices connecting D 9 U uninstalling software A 1 removing all components C 10 updating the firmware 6 5 using DHCP 6 2 other National Instruments applications 1 6 this manual 1 1 V verifying hostname 3 8 installation 5 1 network interface card in computer C 5 serial device server works with your network C 2 C 3 TCP IP protocol C 5 voltage rating 2 2 version firmware C 7 NI Serial server software C 7 voltage rating E 1 caution 2 2 verifying before use 2 2 W Web support from National Instruments online problem solving and diagnostic resources F 1 software related resources F 2 ENET 232 and ENET 485 for Windows NT 4 0 Index Win16 applications using with serial device server C 10 Win32 Overviews and Win32 Reference 6 1 Win32 So
11. FCC has rules to protect wireless communications from interference The FCC places digital electronics into two classes These classes are known as Class A for use in industrial commercial locations only or Class B for use in residential or commercial locations Depending on where it is operated this product could be subject to restrictions in the FCC rules In Canada the Department of Communications DOC of Industry Canada regulates wireless interference in much the same way Digital electronics emit weak signals during normal operation that can affect radio television or other wireless products By examining the product you purchased you can determine the FCC Class and therefore which of the two FCC DOC Warnings apply in the following sections Some products may not be labeled at all for FCC if so the reader should then assume these are Class A devices FCC Class A products only display a simple warning statement of one paragraph in length regarding interference and undesired operation Most of our products are FCC Class A The FCC rules have restrictions regarding the locations where FCC Class A products can be operated FCC Class B products display either a FCC ID code starting with the letters EXN Tiade Nae Wedel Nunwar or the FCC Class B compliance mark that appears as shown here on the right Er eo Cornea FC with FCC Standards Consult the FCC web site http www fcc gov for more information FCC DOC Warnings This e
12. Flashes rapidly at start up while performing self tests and when acquiring network parameters A steady yellow state indicates the box is ready for operation Slow flashing pattern indicates that an error occurred LINK 10 100 Indicates the serial device server detected a twisted pair 10BaseT or 100BaseTX link The color indicates the connection speed If yellow the speed is 10 Mb s If green the speed is 100 Mb s TX Indicates the serial device server is transmitting to the Ethernet network RX Indicates the serial device server is receiving Ethernet network traffic PORT x Indicates which serial ports are open NI Serial Server Software Overview The NI Serial server software for Windows NT includes a native Windows NT kernel driver that provides full interrupt driven buffered I O for multiple COM ports Using this driver you can obtain a maximum baud rate of 460 8 kb s for the ENET 485 and 230 4 kb s for the ENET 232 The NI Serial server software includes the following components Device driver Serial Configuration utility NI Ports NI Ethernet Device Configuration utility Serial Device Server Diagnostics utility NI Ethernet Device Firmware Update utility You can use the NI Serial server software to add COM ports to your computer The software makes the serial ports on the serial device server appear as standard COM ports under Windows NT After installing the Nation
13. OF ELECTRONIC MONITORING OR CONTROL DEVICES TRANSIENT FAILURES OF ELECTRONIC SYSTEMS HARDWARE AND OR SOFTWARE UNANTICIPATED USES OR MISUSES OR ERRORS ON THE PART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY OR PERSONS INCLUDING THE RISK OF BODILY INJURY AND DEATH SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM FAILURE TO AVOID DAMAGE INJURY OR DEATH THE USER OR APPLICATION DESIGNER MUST TAKE REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES INCLUDING BUT NOT LIMITED TO BACK UP OR SHUT DOWN MECHANISMS BECAUSE EACH END USER SYSTEM IS CUSTOMIZED AND DIFFERS FROM NATIONAL INSTRUMENTS TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS THE USER OR APPLICATION DESIGNER IS ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION INCLUDING WITHOUT LIMITATION THE APPROPRIATE DESIGN PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION Compliance FCC Canada Radio Frequency Interference Compliance Determining FCC Class The Federal Communications Commission
14. PWR RDY LED continues to alternate rapidly between red and yellow the unit was unable to use DHCP to configure its network parameters If your network does not have DHCP you must use the NI Ethernet Device Configuration Utility as described in Chapter 3 Ethernet Configuration to give your unit its network configuration If this utility is successful the PWR RDY LED should become steady yellow Then you can run the serial configuration utility as described in Chapter 4 Serial Port Configuration Refer to Appendix C Troubleshooting and Common Questions if the LED does not change to steady yellow If the PWR RDY LED is steady red the serial device server has an unrecoverable error Contact National Instruments Technical Support If the PWR RDY LED blinks a slow red yellow pattern the serial device server did not pass its self tests Refer to Appendix B PWR RDY LED Signaling to interpret the flash pattern before calling National Instruments Technical Support You can skip Chapter 3 Ethernet Configuration if your serial device server can use DHCP Yyou do need to use the NI Ethernet Device Configuration utility if you want to change the hostname from the default hostname listed on the label or if you want to modify the Comment field Sy Note If at any time you want to return the serial device server to its default configuration state as given on the bottom panel identification label press and hold the CFG RESET switch for three secon
15. Windows NT 4 0 3 8 www ni com Chapter 3 Ethernet Configuration To correct the problem with the hostname complete the following steps 1 Locate the device that has a problem This is indicated by an on the device icon as shown previously in Figure 3 1 2 Select Properties A dialog box similar to the following appears NI Ethernet Device Configuration x This device uses DHCP and is configured to use hostname nienet 23456 However the DHCP server assigned it the hostname pep003879pes Your device must be configured with a valid hostname to function properly Select one of the following options to correct the error Change the device s hostname to match the DNS entry Use static network parameters instead of DHCP Contact your network administrator to obtain a valid IP address subnet and gateway Edit the current hostname Contact your network administrator for a valid name Keep the existing hostname Contact your network administrator to update the DNS table Figure 3 5 Fixing a Hostname Verification Error 3 The utility gives you four options for fixing the hostname Select the one that best fits your situation and click OK e Change the device s hostname to match the DNS entry Use this option if you can use the given hostname or cannot contact the system administrator to change the DNS entry e Use static network parameters instead of DHCP Use this option if you cannot use the
16. are using the correct serial cable type null modem or straight through RS 232 or RS 485 e Ifyou are using an ENET 485 confirm that you are using the proper wire mode and bus configuration Refer to the Configuring Transceiver Modes on the ENET 485 section in Chapter 6 Using Your Serial Device Server for more information on the ENET 485 wire modes ENET 232 and ENET 485 for Windows NT 4 0 C 4 www ni com Appendix C Troubleshooting and Common Questions Troubleshooting Diagnostic Messages This section lists the possible error messages returned by the Serial Device Server Diagnostics utility along with solutions for the detected errors Environment is not configured properly This error message occurs if the Serial Device Server Diagnostics utility detected a problem with the operating system environment variables associated with the Windows path Contact your system administrator to correct this problem Required file filename is missing This error message occurs if a critical system file could not be found Reinstall the NI Serial server software for Windows NT to replace the missing files as described in Chapter 2 Installation Error reading registry This error message occurs if a problem was detected with the Windows registry keys associated with the serial device server Complete the following steps to recreate the required keys 1 Open the NI Ports utility Select Start Settings Control Panel NI Ports 2
17. from the list of installed serial ports b Click Settings c Click Advanced d Change the COM port number to a new value After you reassign all local ports close Ports Select Start Settings Control Panel NI Ports Select the NI Serial port you want to rename Click Settings Change the COM port number to a new value ENET 232 and ENET 485 for Windows NT 4 0 C 8 www ni com Appendix C Troubleshooting and Common Questions Why does the CreateFile API fail when I try to open a serial port that is assigned COM12 on the serial device server The NI Serial software assigns COM port numbers starting at COMS However the CreateFile function from the Microsoft Win32 API fails for port names COM10 and higher To use these ports successfully with this function append the string before the port name For example using C to open COM 12 use the following string for the port name COM12 What is the maximum baud rate supported and how can I set it The maximum baud rate supported is 460 8 Kbaud for RS 485 and 230 4 Kbaud for RS 232 To set the baud rate use the Set CommState Win32 function and pass the actual value of the baud rate in the BaudRate field of the DCB structure My application worked with a board interface but it times out when I use the serial device server interface What should I do Because the serial device server is a network device it is dependent on network conditions for timely commu
18. no physical memory addresses are associated with serial device server ports DOS serial applications are unable to access the serial device server ENET 232 and ENET 485 for Windows NT 4 0 C 10 www ni com Appendix C Troubleshooting and Common Questions I powered off my serial device server before recording the flashing PWD RDY LED pattern What should I do Try to duplicate the error before calling National Instruments for assistance Recording the PWR RDY LED pattern is not critical to the operation of your serial device server but it saves you time and helps National Instruments to diagnose the problem quickly and accurately National Instruments Corporation C 11 ENET 232 and ENET 485 for Windows NT 4 0 Serial Port Information RS 232 This appendix describes the RS 232 RS 422 and RS 485 standards and explains some of the issues involved with these types of serial communication Table D 1 lists the features of the RS 232 RS 422 and RS 485 standards Table D 1 RS 232 RS 422 and RS 485 Features Feature RS 232 RS 422 RS 485 Type of Unbalanced Differential Differential transmission lines Maximum number 1 1 32 of drivers Maximum number 1 10 32 of receivers Maximum cable 50 ft 4 000 ft 4 000 ft length Maximum data rate 330 kb s 10 Mb s 10 Mb s Maximum CMV 25 V 7 V 12 to 7 V Driver output 5to25 V 2to6 V 1 5 to 6 V Driver load gt 3 kQ 100 Q 60 Q Nationa
19. of Specifying IP Settings for a Serial Device Server 3 6 Figure 3 4 Hostname Verification Error Detected 00 0 ee eee eeeeseereeeeeereeneeeees 3 8 Figure 3 5 Fixing a Hostname Verification Error eeeeeeseceeeseeeeeeeeees 3 9 Figure 4 1 Adding a New Serial Interface eee eeecceeeeeeeeceseeseeseeeaeeneeeseeeenaes 4 1 Figure 4 2 Specifying a Serial Device Server eee eeeeseeeeceeeseeteeeeenseeneenes 4 2 Figure 4 3 Serial Device Server Confirmation 0 0 ccc eeeeseeseeeeeeeeeeseseeeeseesees 4 2 Figure 4 4 NI Ports Serial Configuration Utility 000 0 ee eeeeseeeeeeeeseeeees 4 3 Figure 4 5 General Port Settings Window eee ceeceseceeeeseeseeeseeseeeaeeneenes 4 4 Figure 5 1 Serial Device Server Diagnostics Utility Before Test 5 1 Figure 5 2 Example of Serial Device Server Diagnostics Utility After Test 5 2 Figure 5 3 Location of Serial Ports on a Four Port Serial Device Server 5 3 Figure 6 1 NI Ethernet Device Firmware Update Utility oes 6 5 Figure 6 2 Transmission Line Using Bias Resistors eee ee eeeeseeseeeeeneeneeeees 6 10 Figure 6 3 Removing the Top Covet oo cecceeceeseseceesecseeeseeseeesecseenseeseensesaeenaes 6 11 Figure 6 4 Location of Bias Resistors eeeeeeseseceeseeseeeseeseeeseeseeeeeseseeeeseenaes 6 12 National Instruments Corporation ix ENET 232 and ENET 485 for Windows NT 4 0 Contents Figure A 1 Add Remove Programs Dialog BOX 0 ee
20. red and yellow to indicate the serial device server is now in network configuration mode This mode remains in effect until you switch off the serial device server or you use the NI Ethernet Device Configuration utility to change its network characteristics Using the CFG RESET Switch at Power On In the event you forget the network configuration that a particular serial device server is using you can reset the unit to its default network characteristics By pressing and holding the CFG RESET switch while you power on the serial device server the network parameters revert to the default settings as defined on the baseplate label As you power on your unit press and hold the switch for approximately three seconds until the PWR RDY LED becomes solid red If you release the switch prior to three seconds no change occurs to the network configuration and the serial device server continues to boot normally The PWR RDY LED goes through the following changes during these three seconds 1 The LED begins slowly alternating between red and yellow 2 The alternating pattern increases in tempo 3 At three seconds the PWR RDY LED becomes steady red This indicates the network configuration will be set to the factory default settings 4 When you release the CFG RESET switch the box continues to boot as normal and the PWR RDY LED indicates the boot process as described in Table 1 1 LED Descriptions ENET 232 and ENET 485 for Windows NT
21. server If your subnet mask is 255 255 255 0 the first three numbers in every IP address on the network must be the same If your subnet mask is 255 255 0 0 only the first two numbers in the IP addresses on the network must match National Instruments Corporation 3 7 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 3 Ethernet Configuration For either subnet mask numbers between 1 and 254 are valid choices for the last number of the IP address Numbers between 0 and 255 are valid for the third number of the IP address but this number must be the same as other devices on your network if your subnet mask is 255 255 255 0 If you are setting up your own network you probably do not have a gateway or DNS server so you should set these values to 0 0 0 0 Verifying the Hostname The NI Ethernet Device Configuration utility automatically verifies that the hostname for each DHCP enabled device matches the DNS entry for the assigned IP address This verification process automatically occurs whenever the utility window is either opened or refreshed The utility alerts you with the following dialog box if a problem is detected with the network settings NI Ethernet Device Configuration l xj 4n error occurred while detecting the network settings For one or more Ethernet devices For each device marked with an click on Properties to resolve the error Figure 3 4 Hostname Verification Error Detected ENET 232 and ENET 485 for
22. the master to give them access to the bus In a typical full duplex system one transmission line connects the bus master transmitter to all of the slave receivers A second transmission line connects all of the slave transmitters to the bus master receiver National Instruments Corporation D 3 ENET 232 and ENET 485 for Windows NT 4 0 Appendix D Serial Port Information Figure D 1 shows a typical full duplex system Slave 1 Slave 2 Slave n ya WA WA eee S a Figure D 1 Typical Full Duplex System MASTER A Xf Half Duplex A typical half duplex multidrop bus architecture also involves a master slave protocol However in a half duplex system all transmitters and receivers are connected to the same transmission line Figure D 2 shows a typical half duplex system Slave 1 Slave 2 Slave n ji E Figure D 2 Typical Half Duplex System i MASTER AN ENET 232 and ENET 485 for Windows NT 4 0 D 4 www ni com Termination Appendix D Serial Port Information Because each differential pair of wires is a transmission line you must properly terminate the line to prevent reflections A common method of terminating a two wire multidrop RS 485 network is to install terminating resistors at each end of the multidrop network If you daisy chained multiple instruments together you need a
23. to the Installing the Serial Device Server section in Chapter 2 Installation for detailed instructions Check that the serial device server is connected to the network and the LINK LED is lit You may be using the incorrect Ethernet cable to connect to the serial device server If the serial device server is connected directly to a network interface card NIC use an Ethernet crossover cable Use an Ethernet straight through cable if the serial device server is connected to a network hub Verify that the hostname is correctly entered in the DNS table For more information refer to the Cannot Access Device When Using Hostname topic earlier in this appendix If the serial device server is located on a different subnet refer to the Cannot Communicate with Devices Located on Other Subnets topic earlier in this appendix Serial Device Server refused request This error message occurs if the serial device server is unable to process a diagnostics command The most likely cause of this problem is that a serial port is open by another user or application Close all serial ports and run the diagnostics program again All serial ports are closed if all port LEDs are off ENET 232 and ENET 485 for Windows NT 4 0 C 6 www ni com Appendix C Troubleshooting and Common Questions Could not directly access the serial port This error message occurs in response to an error with the serial device server Reboot the serial device server and run
24. usage in a serial system The two common means of bi directional serial communication are full duplex and half duplex Half duplex communication involves a transmitter and a receiver connected to each end of the same wire or pair of wires Because the same transmission line both sends and receives data devices cannot send data in both directions at the same time First one device transmits over the wire s to the receiver of the second device When the first device finishes transmitting both devices switch the connections from their transmitter to their receiver or vice versa The device that was receiving data can then transmit over the line In full duplex communication the devices use a separate wire or pair of wires for simultaneous transmission in each direction Thus the devices do not switch between transmitting and receiving In a differential serial bus such as RS 422 or RS 485 a half duplex system transmits and receives over the same twisted pair of wires Thus half duplex communication is often referred to as two wire communications Likewise full duplex communication is often referred to as four wire communications because the full duplex system uses a separate pair of wires for communication in each direction Full Duplex A typical full duplex multidrop bus architecture involves a master slave protocol Only one device the master can control access to the bus All other devices are slaves Slave devices must wait for
25. when you do not need to use 2 5 NI Ports utility figure 4 3 adding a new serial interface 4 1 displaying list of installed NI serial ports C 7 resolving registry error C 5 restoring C 10 www ni com setting transceiver control mode 6 8 verifying most current version C 10 viewing or changing communication port settings 4 3 NI Serial server software determining version C 7 getting started 1 2 installing 2 1 maximum serial ports C 9 overview 1 5 setup program 2 1 space required E 2 uninstalling A 1 NSLookup utility determining hostnames C 2 null modem cabling in a DTE to DTE interface figure D 6 0 online problem solving and diagnostic resources F 1 optional equipment 1 2 overview features 1 3 LEDs 1 4 NI Serial server software 1 5 PWR RDY LED signaling B 1 serial device server 1 3 serial port 1 3 P physical characteristics E 1 pin descriptions DB 25 connector pin descriptions table D 8 connector pin locations figure D 8 National Instruments Corporation l 5 Index DB 9 connector pin descriptions table D 7 connector pin locations figure D 7 ping utility verifying your serial device server works on your network C 2 C 3 Ports utility assigning names to serial ports C 8 displaying list of all installed COM ports C 7 power connection 2 3 power supplies 1 2 E 1 Properties window entering IP settings manually figure 3 6 unconfigured serial device serv
26. xp lic x DTE xI yy Pin 3 Pin 3 X yy Pin3 Figure D 4 Straight Through Cabling in a DTE to DCE Interface Straight through cabling is still the standard method to connect a modem to your PC However because many applications use serial communication to connect two or more DTEs without modems the cabling becomes more complicated If two DTEs are wired together using a straight through cable one transmitter is connected to the other transmitter and one receiver is connected to the other receiver In this setup no transmissions can occur Thus these applications must use a cabling scheme that connects the transmitter on one device to the receiver on the other device and vice versa This method is known as null modem cabling because it replaces the two modems that traditional RS 232 applications would require between the two DTEs To communicate from one DTE serial port to another use a null modem cable Figure D 5 shows null modem cabling in a DTE to DTE interface Rx D Tx D Figure D 5 Null Modem Cabling in a DTE to DTE Interface 1 In Revision D of the RS 232 specification a DCE is a Data Circuit Terminating Equipment ENET 232 and ENET 485 for Windows NT 4 0 D 6 www ni com Appendix D Serial Port Information Cable Connections This section describes the cable connectors on your serial device server DB 9 Connector Figure D 6 and Table D 2 giv
27. 1 3 TEED OyervieWmnen e T Weeds cas estoaiseness E E R ES 1 4 NI Serial Server Software Overview cccccssscccccessssscccccsessceccceesssseeeceeeesseeceeessseeeceeees 1 5 Time Saving Development Tools eee ee eececeseeeeeeseceeeeseceeeseceeeaeeeeeaeeneeeaseneenaes 1 6 Chapter 2 Installation Installing the NI Serial Server Software 00 0 cece eeeeseseeeeseeseeeseeeeesecseeeseeseenseeseenaes 2 1 Installing the Serial Device Server oo eeeecceseeeeeeseceeeeseceeeseeeesaecseenseceeneesaeenaes 2 2 Step 1 Verify the Voltage Rating oe e ce eeeesecneceseeeeetseseeeesetseeeaeeseees 2 2 Step 2 Record the Serial Number Ethernet Address atid Default H s AE a r ea ea canes cakes AS O EERE net 2 2 Step 3 Connect th Cables meene reeeo rE eE TEE EAE E E GEN 2 3 Step 4 Switch on Your Serial Device Server seesseeseeeeeeersereresrererrerereee 2 4 Chapter 3 Ethernet Configuration Using the NI Ethernet Device Configuration Utility sssseeeeesseseesseersresrsresrerrsrrsrseeses 3 2 Configuring the Network Settings seesssesessesseerrsrsresrsresreresresrsresrsresresreees 3 4 Static IP Parameters Tosite dat Aves Sete are eee tes 3 7 Choosing a Static IP Address oo eee eeceeeeeeeseceseeseesseesecseeseceeeseseeseaeenees 3 7 For a Network Administered by a Network Administrator 3 7 For a Network without a Network Administrator eee 3 7 Verifying the Hostname erorrek AE Eeee eeoa ETE EI E ERE 3 8 Natio
28. DTE Data Terminal Equipment and DCE Data Communications Equipment refer to the types of equipment on either end of a serial connection In general DTE and DCE refer to computer equipment and modems respectively For more information about cabling the serial device server to other devices refer to the DTE vs DCE section in Appendix D Serial Port Information The ENET 485 servers support four hardware transceiver control modes for reliable communication with two and four wire devices For more information about transceiver control modes refer to Chapter 6 Using Your Serial Device Server The serial device server contains FIFO First In First Out buffers to reduce susceptibility to interrupt latency for faster transmission rates Also serial device servers contain additional on board buffers to reduce susceptibility to Ethernet network traffic Feature Overview With the serial device server you gain all the features inherent in a networked device fewer cabling distance restrictions device sharing and communication with devices throughout the Internet In a serial application you usually are restricted to the distance limitations of the RS 232 RS 422 or RS 485 specifications Because the serial device server uses Ethernet you can add an unlimited distance to your application by exploiting the distances available using a networked device Device sharing with a serial device server happens on a per port basis That is although t
29. Every product has a unique serial number Ethernet address and default hostname 1 Locate the serial number Ethernet address and default hostname on the bottom panel label of the serial device server as indicated in Figure 2 2 2 Record this information on the front page of the Getting Started card that came with your kit Recording this information is not necessary for proper installation However you will find it convenient when you configure the serial device server 3 Note The Ethernet address is not the IP address All devices on an Ethernet network are assigned a unique physical address the Ethernet address so they can communicate with each other ENET 232 and ENET 485 for Windows NT 4 0 2 2 www ni com Chapter 2 Installation a INSTRUMENTS PART NO XXXXXXX XX x www ni com SERIAL NO XXXXXX C M AN YELLOW 10BASE T ETHERNET ADDRESS XXXXXXXXXXXX GREEN 100BASE T IN DEFAULT HOSTNAME NIENETXXXXxX Peinstrumes MODEL ENET 232 4 LINK LED CONNECTION 1 Serial Number 2 Ethernet Address 3 Default Hostname Figure 2 2 Serial Device Server Bottom Panel Identification Label You can change the hostname after you finish the installation and configuration steps in this chapter Refer to the Configuring the Network Settings section in Chapter 3 Ethernet Configuration for more information Step 3 Connect the Cables Figure 2 3 shows t
30. Properties nienetBSB7BA Figure 3 2 Properties Window for an Unconfigured Serial Device Server ENET 232 and ENET 485 for Windows NT 4 0 3 4 www ni com National Instruments Corporation Chapter 3 Ethernet Configuration The current hostname is displayed The hostname associates a name with a numerical IP address Hostname is a required field The serial device server attempts to use the hostname when registering with DHCP Many DHCP servers have the ability to register the hostname and the assigned IP address You then can reliably use the hostname to communicate with your serial device server even if the numerical IP address changes However some DHCP servers do not implement hostname registration The serial device server requires domain name server DNS registration when using DHCP If your DHCP server does not support DNS registration you must use static network parameters Consult your network administrator for more details For more information about DHCP refer to the Using DHCP section in Chapter 6 Using Your Serial Device Server In the Properties window select either Obtain an IP address automatically DHCP or Use the following IP settings If you select Obtain an IP address automatically DHCP you do not need to enter any network parameters unless you want to change the hostname of the Ethernet device If you select Use the following IP settings enter the network parameters you have c
31. Serial ENET 232 Series and ENET 485 Series User Manual for Windows NT 4 0 Qr NATIONAL May 2000 Edition gt INSTRUMENTS Part Number 370128A 01 Worldwide Technical Support and Product Information www ni com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 794 0100 Worldwide Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Calgary 403 274 9391 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 New Zealand 09 914 0488 Norway 32 27 73 00 Poland 0 22 528 94 06 Portugal 351 1 726 9011 Singapore 2265886 Spain 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2528 7227 United Kingdom 01635 523545 For further support information see the Technical Support Resources appendix To comment on the documentation send e mail to techpubs ni com Copyright 2000 National Instruments Corporation All rights reserved Important Information Warranty The serial hardware is warranted against defects in materials and workmanship for a period of one year from
32. T 232 and ENET 485 for Windows NT 4 0 l 6 using with DOS applications C 10 using with Win16 applications C 10 Serial Device Server Diagnostics utility after test figure 5 2 before test figure 5 1 closing ports before using C 6 fails with error C 9 purpose 5 2 running 5 1 running before connecting serial devices 2 4 serial devices connecting 5 3 serial number location 2 2 serial ports assigning names C 8 configuring 4 1 connecting devices 5 3 displaying list of installed NI serial ports C 7 general information D 1 if cannot open port C 4 location 5 3 maximum supported C 9 overview 1 3 problem accessing directly C 7 problem accessing locally C 7 serial specifications E 2 setting transceiver control mode 6 8 setting with DeviceloControl 6 8 software characteristics E 2 determining version C 7 installing 2 1 setup program figure 2 1 software related resources F 2 specifications electrical characteristics E 1 environmental characteristics E 1 network specifications E 2 www ni com physical characteristics E 1 serial specifications E 2 software characteristics E 2 static IP address when easier than using DNS 6 3 static IP parameters if DHCP not available 3 7 when to use 3 9 straight through cabling in a DTE to DCE interface figure D 6 subnet mask 3 7 subnets communicating with other subnets C 3 T TCP IP protocol verifying C 5 technical support before contacting
33. TR bit to assert DTR After the data is fully transmitted your application once again clears the DTR bit to disable the transmitter Because the receiver always is enabled in this mode you receive packets not only from other devices but also from your transmitter Two Wire Mode DTR Controlled This mode is similar to the two wire DTR with echo mode Use this mode in half duplex systems where the DTR line must control the transmitter Although this mode uses the same method as the DTR with echo mode to control the transmitter the hardware automatically disables the receiver whenever the transmitter is enabled Thus you do not receive the packets sent from your transmitter National Instruments Corporation 6 7 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 6 Using Your Serial Device Server Two Wire Mode Auto Control In this mode the serial hardware transparently enables the transmitter and receiver in a two wire system Use this mode to remove the burden of flow control from your application The hardware enables the transmitter for each byte to be transmitted Also the hardware disables the receiver whenever the transmitter is enabled so you do not receive the packets sent from your transmitter 3 Note When you are communicating with a two wire device National Instruments recommends that you use the two wire Auto Control mode Because this mode handles the transmitter receiver enabling for a two wire connectio
34. al Instruments Corporation 1 5 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 1 Introduction software using the serial ports is similar to using standard Win32 COM ports Furthermore any program using the communication interface can use the serial device server as if it were a local COM port Time Saving Development Tools Your kit includes the NI Serial server software for Windows NT After you install your serial device server and the NI Serial server software you can use any applications that make standard Windows serial I O function calls Development environments such as Visual Basic Visual C and Excel as well as the following National Instruments applications software products can access the add in serial ports using standard serial I O functions LabVIEW is a graphical programming environment you can use to acquire data from thousands of different instruments including IEEE 488 2 devices VXI devices serial devices PLCs and plug in data acquisition boards After you acquire raw data you can convert it into meaningful results using the data analysis routines in LabVIEW The LabVIEW instrument drivers reduce software development time because you do not have to program the low level control of each instrument Bridge VIEW extends the graphical programming of LabVIEW to develop industrial automation and control systems Lookout is an object oriented automation software system that uses drag and drop to build applica
35. am from a floppy disk or CD ROM eg drive click Install The following software can be automatically removed by Windows To remove a program orto modify its installed components select it from the list and click Add Remove National Instruments Measurement amp Automation Explorer 1 0 1 National Instruments Serial National Instruments VISA NI ComponentVorks 3DGraph NI DataSocket NI LabVIEW Run Time Engine 5 1 NI LabVIEW v5 1 Professional NI Serial Device Server 1 0 NEPAL 1 2 1f0 N Reports Add Remove OK Cancel Apply Figure A 1 Add Remove Programs Dialog Box National Instruments Corporation A 1 ENET 232 and ENET 485 for Windows NT 4 0 Appendix A Uninstalling the Software 3 Select the NI Serial server software you want to uninstall and click Add Remove The Uninstall program removes all folders utilities and registry entries associated with the NI Serial server software Figure A 2 shows the results of a successful uninstallation Remove Programs From Your Computer x unlnstallShield will remove the software NI Serial Device Server 1 0 from your computer Please wait while each of the following components is removed Shared program files Standard program files Folder items Vv Y Vv Program folders Program directories Y Program registry entries Uninstall successfully completed Figure A 2 Successful Uninstallation 4 R
36. arameters 3 7 subnet mask 3 7 ipconfig viewing network settings C 3 K kit contents 1 2 L label figure 2 3 information to record 2 2 location 2 2 LEDs description of each table 1 5 Ethernet LEDs C 4 overview 1 4 PWR RDY LED B 1 M missing files C 5 multidrop network using terminating resistors figure D 5 naming serial ports C 8 National Instruments application software BridgeVIEW 1 6 LabVIEW 1 6 Lookout 1 6 Measurement Studio 1 6 using with your serial device server 1 7 6 1 ENET 232 and ENET 485 for Windows NT 4 0 l 4 National Instruments Web support F 1 network administrator assigning static IP parameters 3 7 configuring DNS table C 2 confirming DHCP availability 2 4 if DHCP fails 6 3 network configuration mode entering automatically 3 1 entering manually 3 1 6 3 when to use 3 1 network problems cannot change network settings C 2 communication problems with other subnets C 3 device not shown in NI Ethernet Device Configuration utility C 1 DHCP does not configure network parameters C 1 hostname cannot access device C 2 network settings configuring with DHCP 2 4 configuring without DHCP 3 1 3 5 determining C 3 problems configuring C 2 network specifications E 2 NI Ethernet Device Configuration utility assigning IP address manually 3 2 possible device states 3 2 Properties menu 3 3 refreshing 3 3 starting 3 2 troubleshooting C 1 when to use 2 5 3 1
37. as Resistor 100 Q Termination Resistor 620 Q Bias Resistor Figure 6 2 Transmission Line Using Bias Resistors The ENET 485 Series has four user configurable bias resistors in front of each connector These resistors are socketed and pre loaded with 620 Q resistors They are connected to the receive signals of each port to maintain a known state when the bus is idle The connections are made as follows e RXD and CTS are pulled up to VCC e RXD and CTS are pulled down to GND Rather than using two 620 Q resistors at one node you can increase the value of the resistors and put them at every node For example if there are eight nodes in a system you can use 4 7 kQ resistors at each node to effectively achieve the same result ENET 232 and ENET 485 for Windows NT 4 0 6 10 www ni com Chapter 6 Using Your Serial Device Server Changing Bias Resistors Complete the following steps to change the bias resistors on the ENET 485 Series 1 Power off the serial device server and disconnect the cables 2 Remove the four screws on the bottom baseplate Slide the top cover away from the rear panel and then up as shown in Figure 6 3 Figure 6 3 Removing the Top Cover National Instruments Corporation 6 11 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 6 Using Your Serial Device Server
38. ation program created the Uninstall program does not delete that directory because the directory is not empty after the uninstallation You will need to remove any remaining components yourself I installed or uninstalled NI Serial software for Windows NT and NI Ports no longer supports the serial device server devices or is missing What should I do NI Ports is a shared utility with both NI Serial PCI AT and PCMCIA products and NI Serial server serial device server products The most current version of NI Ports must be installed to support both product lines To restore NI Ports reinstall the NI Serial device server software as described in Chapter 2 Installation You do not need to reinstall the serial device server devices as their configuration information should be intact Can I use the serial device server with older Win16 serial applications Yes if the application uses standard Win16 API function calls While the serial device server uses the Win32 API Windows automatically translates the Win16 API calls into Win32 API calls with Windows On Windows WOW As a result Win16 applications running in a Win32 environment can use the serial device server Can I use the serial device server with DOS serial applications No Because the serial device server driver uses the Windows API DOS serial applications will not work DOS understands only that COM1 is mapped to base address 3f8 COM2 is mapped to 2f8 and so on Because
39. d C libraries and ActiveX to help you build measurement and automation applications With the ComponentWorks instrument classes you can use the IEEE 488 2 library and VISA an industry standard I O library to communicate with GPIB VXI or Serial devices using the same set of components If you already have one or more of these applications and want to use them with your serial device server refer to your product documentation for information about serial I O functions For ordering information contact National Instruments National Instruments Corporation 1 7 ENET 232 and ENET 485 for Windows NT 4 0 Installation This chapter describes how to install the NI Serial server software and the serial device server Installing the NI Serial Server Software Complete the following steps to install the NI Serial server software for Windows NT 1 Login as Administrator or as a user who has administrator privileges 2 Insert disk 1 of the MI Serial Server Software for Windows NT disk kit Select Start Run and type A setup exe in the Run prompt 4 The setup wizard guides you through the necessary steps to install the NI Serial server software To exit the setup wizard at any time click the Cancel button Serial Device Server Setup x Welcome to the Serial Device Server setup program from National Instruments This program will install Serial Device Server version 1 0 on your computer It is strongly recomme
40. d click Add National Instruments Ports Ed N I PCI 485 4 gt N I PCI 485 4 gt N I PCI 48574 ENET 232 4 d ENET 232 4 Settings ENET 232 4 ENET 232 4 Delete Add a New Serial Interface PCM ClA 485 x Add Figure 4 1 Adding a New Serial Interface National Instruments Corporation 4 1 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 4 Serial Port Configuration 3 4 When the NI Serial Device Server window appears enter either an IP address or a hostname to identify the serial device server Click OK NI Serial Device Server ae e Figure 4 2 Specifying a Serial Device Server Review the information on the Serial Device Confirmation window that appears Serial Device Confirmation Figure 4 3 Serial Device Server Confirmation Click Yes to add the device or No to cancel the operation You must reboot your system at this time for your NI Serial server software configuration to take effect Select Start Shut Down Restart National Instruments recommends you verify the installation as described in Chapter 5 Verify the Installation You then can connect serial devices to the serial ports on the serial device server ENET 232 and ENET 485 for Windows NT 4 0 4 2 www ni com Chapter 4 Serial Port Contiguration Viewing or Changing Communication Port Settings This section describes how to use the Serial Configuration utility to view or change the co
41. d configure the National Instruments serial device server and the NI Serial server software for Windows NT This manual includes information about the ENET 232 and ENET 485 serial device servers The NI Serial server software included in this kit is intended for Windows NT 4 0 with Service Pack 3 or higher installed This manual assumes that you are already familiar with Windows NT bold italic monospace The following conventions appear in this manual The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box Signal names with an overscore such as DTR indicate that the signal is active low This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash Bold text denotes items that you must select or click on in the software such as menu items and dialog box options Bold text also denotes parameter names and LED names Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply Text in this font denotes text or characters that you should enter from the keyboard sections of code prog
42. device server and then click Properties The firmware version is listed in the Properties window National Instruments Corporation C 7 ENET 232 and ENET 485 for Windows NT 4 0 Appendix C Troubleshooting and Common Questions How can I determine which port is associated with COMx To determine which physical port is associated with COMx complete the following steps 1 Select Start Settings Control Panel NI Ports A list of installed National Instruments ports with their logical COMx names appears If the COM ports associated with a particular serial device server are missing from this list refer to the Adding a New Serial Interface section in Chapter 4 Serial Port Configuration to add the serial device server COM ports to your computer Select a COM port and click Settings The General Port Settings dialog box displays information that identifies the serial interface associated with this COM port For all serial device servers PORT 1 refers to the port next to the RJ 45 Ethernet connector PORT 2 refers to the next adjacent port and so on How can I name National Instruments serial ports COM1 COM2 COM3 or COM4 Complete the following steps 1 2s a oy OY ae Select Start Settings Control Panel Ports Verify that no local ports are already assigned to the COM number s you wish to use If they are use the following procedure to reassign these ports a Select the local COM port you want to reassign
43. ds at power on This switch is located on the rear panel as shown in Figure 2 3 Refer to the Using the CFG RESET Switch section in Chapter 6 Using Your Serial Device Server for more information National Instruments Corporation 2 5 ENET 232 and ENET 485 for Windows NT 4 0 Ethernet Configuration This chapter describes how to use the NI Ethernet Device Configuration utility to configure the network parameters of the serial device server You can use this utility for any of the following purposes e Manually configure the network parameters or enable DHCP e Change the Comment field e Verify or change the hostname of the device The serial device server must be in network configuration mode before you can make changes to the network parameters The unit automatically enters this mode if it is configured with the factory default settings and DHCP is not available You also can enter this mode during normal operation by pressing and holding the CFG RESET switch for three seconds Refer to Using the CFG RESET Switch in Chapter 6 Using Your Serial Device Server for more information on using this switch While in network configuration mode the PWR RDY LED alternates rapidly between red and yellow and normal operation is halted National Instruments Corporation 3 1 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 3 Ethernet Configuration Using the NI Ethernet Device Configuration Utility If your network administrator
44. e provides a hostname with the configuration request DHCP may attempt to configure your network to recognize the device with the requested hostname DHCP requires a Domain Name Server DNS to associate the numerical IP address assigned with the requested hostname Within the past few years an Internet community standard has emerged to provide a standardized way for these services to provide dynamic domain name services Using this standard after DHCP assigns the numerical IP address it can communicate with DNS to register the newly assigned IP address with the requested hostname However the complexity of DHCP and dynamic name registration typically requires active management by a corporate IT department or equivalent because of several risks for failure One possible failure can occur if the pool of available addresses contains no more unassigned IP addresses This problem is evident if DHCP fails to work and the PWR RDY LED continues to flicker for longer than 90 seconds at power on In this situation you will need to obtain a static IP address from your network administrator and configure the device yourself using the NI Ethernet Device Configuration utility Notice that if DHCP fails to assign you an address the current subnet might not have an address available for you to use In this case you may have to move your product to another subnet where there is an available IP address Failure also happens if communication between DHCP a
45. e the pin locations and descriptions of the DB 9 connector PINS PINS PIN 1 PIN 6 Sees Qe Figure D 6 DB 9 Connector Pin Locations Table D 2 DB 9 Pin Descriptions DB 9 Pin 232 Signal 485 Signal 1 DCD GND 2 RXD CTS HSI 3 TXD RTS HSO 4 DTR RXD 5 GND RXD 6 DSR CTS HSI 7 RTS RTS HSO 8 CTS TXD 9 RI TXD National Instruments Corporation D 7 ENET 232 and ENET 485 for Windows NT 4 0 Appendix D Serial Port Information DB 25 Connector Figure D 7 and Table D 3 give the pin locations and descriptions of the DB 25 connector which is on the optional DB 9 to DB 25 converter PIN 13 PIN 25 PIN 4 PIN 14 Figure D 7 DB 25 Connector Pin Locations Table D 3 DB 25 Pin Descriptions DB 25 Pin 232 Signal 485 Signal 2 TXD RTS HSO 3 RXD CTS HSI 4 RTS RTS HSO 5 CTS TXD 6 DSR CTS HSI 7 GND RXD 8 DCD GND 20 DTR RXD 22 RI TXD Pins not listed in this table are No Connect ENET 232 and ENET 485 for Windows NT 4 0 D 8 www ni com Appendix D Serial Port Information Connecting Two Wire Devices The ENET 485 is designed to work with either two or four wire devices If you are using a two wire device refer to the device documentation for specific wiring instructions In general half duplex networks use a
46. eboot your computer if Windows NT prompts you to do so The uninstallation program removes only items that the setup wizard installed If you added anything to a directory that the setup wizard created the uninstallation program does not delete that directory You must remove any remaining components yourself To reinstall the hardware and software refer to Chapter 2 Installation ENET 232 and ENET 485 for Windows NT 4 0 A 2 www ni com PWR RDY LED Signaling This appendix describes how to interpret the PWR RDY LED error codes PWR RDY LED Overview The PWR RDY LED has several purposes on the serial device servers When you first power on the unit the PWR RDY LED alternates rapidly between red and yellow while it completes its power on self tests and acquires network parameters When the tests complete successfully and the IP address is assigned from either nonvolatile memory or the network the PWR RDY LED remains steady yellow indicating that the unit is ready to operate The PWR RDY LED also alternates rapidly between red and yellow while the device is in network configuration mode At other times the PWR RDY LED blinks slowly in a recognizable pattern to alert you of internal errors Use this appendix to interpret and record the pattern that the PWR RDY LED flashes and then contact National Instruments 3 Note By recording the PWR RDY LED error messages before calling National Instruments you can save yourself time a
47. eceseeeeeseeeeeeseeneeeseeeeeseeaes A 1 Figure A 2 Successful Uninstallation s ssseseeeeeeseeseseesssrsresresrsresrerrsresresrsresresesres A 2 Figure D 1 Typical Full Duplex System 0 eee cece eseeeeeeeeeseeneeesesaeenseeaes D 4 Figure D 2 Typical Half Duplex System ssssssssssesssssreesesrsresrsresrrsrsresrrsrsreersresrees D 4 Figure D 3 Multidrop Network Using Terminating Resistors 0 00 0 eee eee D 5 Figure D 4 Straight Through Cabling in a DTE to DCE Interface D 6 Figure D 5 Null Modem Cabling in a DTE to DTE Interface ee D 6 Figure D 6 DB 9 Connector Pin Locations eee eeeseeeeeeseeneeeeeeeeeseeeenseeaes D 7 Figure D 7 DB 25 Connector Pin Locations eee eee eeeeeeeseeeeeeseeseeeseesenseeaes D 8 Tables Table 1 1 LED Descriptions is sisicsesevisisecrevel E A nea sees teen neste 1 5 Table 6 1 Transceiver Control Modes eee eeceeseeseceeeeeeeeeseeeseeeesseeseeseeeatens 6 7 Table 6 2 DeviceloControl Function Input Values 2 0 0 0 cece eseereeeeeeeeeee 6 9 Table D 1 RS 232 RS 422 and RS 485 Features cccccceeeesssssssscesseceeeeeeeeeens D 1 Table D 2 DB 9 Pin Descriptions 0 0 eee ec eeeeseeeecesececeseseeesecseeesesseeeaeeseeeaeens D 7 Table D 3 DB 25 Pin Descriptions ninsis ee eeeeeeseceseeseeeseeseenseeseeesecaesnaeeseeaees D 8 ENET 232 and ENET 485 for Windows NT 4 0 X www ni com About This Manual Conventions This manual contains instructions to help you install an
48. er figure 3 4 PWR RDY LED description 1 5 if alternating rapidly B 1 if blinking a pattern 2 5 B 1 if red 2 5 if still flashing C 4 if yellow 2 4 B 1 interpreting status messages B 1 observing during self tests 2 4 overview B 1 when using CFG RESET switch 6 4 R readme txt file location C 7 rear panel figure 2 3 5 3 rebooting after uninstalling the software A 2 to set new Ethernet configuration 3 6 to set new software configuration 4 2 refreshing list of Ethernet devices 3 3 3 10 registry error C 5 ENET 232 and ENET 485 for Windows NT 4 0 Index related documentation xii removing NI Serial server software A 1 top cover figure 6 11 resetting default network characteristics 6 4 RS 232 standard features table D 1 overview D 1 RS 422 standard features table D 1 overview D 2 RS 485 standard features table D 1 overview D 2 S self tests if not passed 2 5 if passed 2 4 serial communication issues cable connections D 7 connecting two wire devices D 9 DTE vs DCE D 6 duplex architectures D 3 termination D 5 serial configuration utility NI Ports adding a new serial interface 4 1 viewing or changing communication port settings 4 3 serial device server diagnostics utility 5 1 features 1 3 general programming requirements 6 1 getting started 1 2 installing 2 2 LEDs 1 4 overview 1 3 powering on 2 4 timeout problems C 9 unconfigured device 3 3 ENE
49. es 6 7 Two Wire Mode DTR Controlled eceeeeseceeesseesseeseceeeeseeaeenseeeenaes 6 7 Two Wire Mode Auto Control cee cecceseceeeseceseeseesseeseceseessenseeseenaeeaes 6 8 Setting the Transceiver Control Mode eee eeeeseeeeeeeseeeseeeeeeseteeeeneesees 6 8 Setting the Transceiver Mode with DeviceloControl cece eeeeeceeeeeeeees 6 8 Changing the Bias Resistors on the ENET 485 0 ccc cccceccececesenseneceeceeesesseseeneeseenes 6 9 Functionality of Bias Resistors 0 0 0 ects eecessceseeseceeeeseeseeesecseeesecssenseeeeeaes 6 9 Changing Bias Resistors isccsccnrivpscersscttecsecuete E E RE 6 11 Appendix A Uninstalling the Software Appendix B PWR RDY LED Signaling Appendix C Troubleshooting and Common Questions ENET 232 and ENET 485 for Windows NT 4 0 viii www ni com Contents Appendix D Serial Port Information Appendix E Specifications Appendix F Technical Support Resources Glossary Index Figures Figure 1 1 Front Panel of a Four Port Serial Device Server eee 1 4 Figure 2 1 NI Serial Server Setup Screen oo ccs eeseeseceeeeeeneensesseeeseeeenaes 2 1 Figure 2 2 Serial Device Server Bottom Panel Identification Label 00 0000 2 3 Figure 2 3 Rear Panel of a Four Port Serial Device Server eee eens 2 3 Figure 3 1 NI Ethernet Device Configuration Utility 0 0 0 eee eeeereeeeeeees 3 2 Figure 3 2 Properties Window for an Unconfigured Serial Device Server 3 4 Figure 3 3 Example
50. f a successful test If the test fails refer to Appendix C Troubleshooting and Common Questions to troubleshoot the problem Serial Device Server Diagnostics Figure 5 2 Example of Serial Device Server Diagnostics Utility After Test ENET 232 and ENET 485 for Windows NT 4 0 5 2 www ni com Chapter 5 Verify the Installation Connecting Serial Devices Connect your serial devices at this time Connect one end of the serial cable to one of the serial port connections on the rear panel of your serial device server Connect the other end of the serial cable to your serial device Figure 5 3 shows the location of the serial ports on a four port serial device server S GEA PORT 4 D Y f ojo e 1 Serial Ports 1 and 2 2 Serial Ports 3 and 4 on four port models only Figure 5 3 Location of Serial Ports on a Four Port Serial Device Server Refer to Appendix D Serial Port Information for more information about cabling specifications National Instruments Corporation 5 3 ENET 232 and ENET 485 for Windows NT 4 0 Using Your Serial Device Server This chapter lists some general programming requirements and describes how to use the following various options available with your serial device server e Using DHCP e Using the CFG RESET Switch e Updating the Firmware e Configuring Transceiver Modes on the ENET 485 e Changing the Bias Resis
51. ftware Development Kit 6 1 worldwide technical support F 2 ENET 232 and ENET 485 for Windows NT 4 0 www ni com
52. given hostname and cannot contact your network administrator to change the DNS entry This option disables DHCP on the device e Edit the current hostname Use this option to change the hostname to a name other than either the configured hostname or the name given by the DHCP server Contact your network administrator for a valid name National Instruments Corporation 3 9 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 3 Ethernet Configuration e Keep the existing hostname Use this option if you wish to keep the previously assigned hostname If you select this option contact your system administrator to change the DNS entry 4 Review the network parameter settings in the Properties window Confirm that the device is in network configuration mode and click OK The device reboots with the new settings in effect 6 After the device reboots click Refresh to verify that the hostname is now valid ENET 232 and ENET 485 for Windows NT 4 0 3 10 www ni com Serial Port Configuration This chapter describes how to configure your Windows NT machine to use the serial device server Adding a New Serial Interface The Serial Configuration utility is fully integrated into the Windows NT Control Panel Use this utility to add a new serial interface 1 Select Start Settings Control Panel NI Ports to launch the Serial Configuration utility 2 Select a new interface from the Add a New Serial Interface pulldown listbox an
53. he serial device server supports network connections from multiple hosts each serial port is associated with only one host at a time National Instruments Corporation 1 3 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 1 Introduction LED Overview Dynamic Host Configuration Protocol DHCP is available on many networks to automatically configure network parameters DHCP simplifies the installation and configuration process for the serial device server For more information about DHCP refer to Using DHCP in Chapter 6 Using Your Serial Device Server If your network does not support DHCP use the NI Ethernet Device Configuration utility as described in Chapter 3 Ethernet Configuration to configure network parameters for the serial device server Figure 1 1 shows the light emitting diodes LEDs on the ENET 232 4 serial device server The LEDs are visible from the top and front of the unit BFF REDEEM ES ss NATIONAL INSTRUMENTS J ENET to RS 232 o 1 Power Ready LED 2 Ethernet LEDs 3 Serial Port LEDs 4 Power Switch Figure 1 1 Front Panel of a Four Port Serial Device Server ENET 232 and ENET 485 for Windows NT 4 0 1 4 www ni com Chapter 1 Introduction The LEDs show the current status of the serial device server Table 1 1 describes each LED Table 1 1 LED Descriptions LED Description PWR RDY
54. he locations of the power Ethernet and serial port connections on the rear panel of the serial device server 1 Configuration Reset Switch 4 Serial Ports 1 and 2 2 Power Connection 5 Serial Ports 3 and 4 3 Ethernet Connection on 4 port models only Figure 2 3 Rear Panel of a Four Port Serial Device Server National Instruments Corporation 2 3 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 2 Installation To connect your cables complete the following steps 1 Connect one end of your Ethernet cable to your serial device server Connect the other end of the Ethernet cable to your Ethernet network Make sure you comply with all IEEE 802 3 cabling restrictions 2 Secure the power connection by screwing the power connector onto the power jack of the serial device server Plug the wall mount power supply into an AC outlet of the correct voltage Note National Instruments recommends against connecting serial devices to your serial ports until you configure the NI Serial server software as described in Chapter 4 Serial Port Configuration and then run the Serial Device Server Diagnostics utility as described in Chapter 5 Verify the Installation Running the Serial Device Server Diagnostics utility requires that you leave the ports unconnected If you do not intend to run the Serial Device Server Diagnostics utility you can connect your serial devices at this time For more information about t
55. he serial cable connections see Appendix D Serial Port Information Step 4 Switch on Your Serial Device Server Before you power on your serial device server contact your network administrator to determine whether you need to configure your network settings manually using the NI Ethernet Device Configuration utility or use the Dynamic Host Configuration Protocol DHCP to perform the configuration automatically When you turn on the front panel power switch the PWR RDY LED alternates rapidly between red and yellow while the unit completes its power on self tests and attempts to acquire its network parameters By default the serial device server attempts its network configuration through DHCP The time required for the IP address assignment is dependent on your network and the configuration of your serial device server Allow up to 90 seconds and observe the state of the PWR RDY LED to determine the outcome of the self tests One of the following should occur e A steady yellow PWR RDY LED indicates the serial device server passed its self tests and acquired its IP address The unit is now ready to operate When using DHCP the serial device server typically is ready to operate about 15 seconds after you power it on Run the serial configuration utility as described in Chapter 4 Serial Port Configuration to add the serial ports to your computer ENET 232 and ENET 485 for Windows NT 4 0 2 4 www ni com Chapter 2 Installation If the
56. hosen for the host IP address subnet mask gateway IP and DNS server IP as in the example shown in Figure 3 3 Refer to Static IP Parameters for more information 3 5 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 3 Ethernet Configuration DY ENET 485 2 Properties Network Settings Serial number OOBSB 784 Ethernet address 00 80 26 ff 00 71 Firmware version Al Hostname Obtain an IP address automatically DHCP gt Use the following IP settings IP address 130 164 54 200 Subnet mask 255 255 255 O Gateway 130 164 54 1 DNS server De meai AD Comment optional Building 7 2nd floor cea Figure 3 3 Example of Specifying IP Settings for a Serial Device Server ay Note The IP settings in Figure 3 3 are shown only as an example of the format 4 You can enter an optional comment to help you identify each device 5 Click OK to configure the device or Cancel to exit without saving the configuration changes 6 Click Exit to close the NI Ethernet Device Configuration utility The device automatically reboots with the new configuration in effect ENET 232 and ENET 485 for Windows NT 4 0 3 6 www ni com Chapter 3 Ethernet Configuration Static IP Parameters If DHCP is not available you must provide the serial device server with several important network parameters These parameters are listed below e IP address The unique computer readable address of a de
57. in the Technical Support section of the National Instruments Web site and provides technical support telephone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access NI Web Support To provide you with immediate answers and solutions 24 hours a day 365 days a year National Instruments maintains extensive online technical support resources They are available to you at no cost are updated daily and can be found in the Technical Support section of our Web site at www ni com support Online Problem Solving and Diagnostic Resources e KnowledgeBase A searchable database containing thousands of frequently asked questions FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback e Troubleshooting Wizards Step by step guides lead you through common problems and answer questions about our entire product line Wizards include screen shots that illustrate the steps being described and provide detailed information ranging from simple getting started instructions to advanced topics e Product Manuals A comprehensive searchable library of the latest editions of National Instruments hardware and software product manuals e Hardware Reference Database A searchable database containing brief hardware descriptions mechanical drawings and helpful images
58. ion is intended for advanced users The ENET 485 supports four modes of hardware transceiver control You can use hardware flow control to enable and disable your transmitters and receivers so that they function on different bus topologies Table 6 1 lists the status of the transmitters and receivers under each of the transceiver control modes ENET 232 and ENET 485 for Windows NT 4 0 6 6 www ni com Chapter 6 Using Your Serial Device Server Table 6 1 Transceiver Control Modes Mode Transmitter Receiver Four wire mode Always enabled Always enabled Two wire mode Enabled with Always enabled DTR with echo DTR asserted Two wire mode Enabled with Enabled with DTR controlled DTR asserted DTR unasserted Two wire mode Enabled when Enabled when not Auto Control transmitting data transmitting data 3 Note Signal names with an overscore such as DTR indicate that the signal is active low Four Wire Mode Use the four wire mode for most full duplex systems In this mode the transmitter and receiver are always enabled This mode is the default Two Wire Mode DTR with Echo Use this mode in half duplex systems where the DTR Data Terminal Ready line must control the transmitter In the DTR with echo mode the transmitter is tri stated when the DTR signal of the UART Universal Asynchronous Receiver Transmitter is unasserted To transmit your application first must enable the transmitter by setting the D
59. ively to determine the IP address associated with a particular hostname you can type in the following command instead nslookup hostname If you still cannot communicate with your device contact National Instruments Cannot Communicate with Devices Located on Other Subnets e Verify that the device is present on the network by pinging the IP address of your device Find the directory where ping exe is installed and type in the following command ping IPaddress where IPaddress is the IP address assigned to your serial device server e Confirm that the gateway settings of the device are set properly To do this run the NI Ethernet Device Configuration utility on a computer on the same subnet as the device e Confirm that the gateway settings of the host machine are set properly To view your network settings run ipconfig a Open a Windows NT Command window b Type ipconfig at the prompt c Press lt Enter gt If you need more information you can run ipconfig with the all option by typing ipconfig all This shows you all of the settings for the Windows NT machine Make sure you use the settings for the Ethernet adapter you are using to communicate with the serial device server Troubleshooting Hardware Problems Unit Does not Power on Verify that the external power supply is securely fastened to the device and the power supply is plugged into an outlet of proper voltage and the power switch is in the ON posi
60. l Instruments Corporation D 1 As specified in the ANSI EIA 232 D Standard Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange RS 232 standardizes serial communication between computers and between computer terminals and modems Many applications use the RS 232 standard to interface peripherals to personal computers RS 232 uses transmission lines in which the state of each signal is represented by referencing the voltage level of a single line to ground RS 232 was designed for serial communication up to ENET 232 and ENET 485 for Windows NT 4 0 Appendix D Serial Port Information RS 422 distances of 50 ft and with data rates up to 20 kb s However because of improvements in line drivers and cabling you can usually increase the actual performance of the bus past the limitations on speed and distance recommended in the specification RS 485 As specified in the E A RS 422 A Standard Electrical Characteristics of Balanced Voltage Digital Interface Circuits RS 422 defines a serial interface much like RS 232 However RS 422 uses balanced or differential transmission lines Balanced transmission lines use two transmission lines for each signal The state of each signal is represented not by a voltage level on one line referenced to ground as in RS 232 but rather by the relative voltage of the two lines to each other For example the TX signal is carried
61. ld consult National Instruments if errors are suspected In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of thi
62. n in your hardware it reduces the software overhead required to perform this operation in your application program For more information about serial communication in two or four wire modes refer to the Serial Communication Issues section in Appendix D Serial Port Information Setting the Transceiver Control Mode To set the transceiver control mode use the NI Ports serial configuration utility For instructions on how to use the utility refer to Chapter 4 Serial Port Configuration The mode you select in the configuration utility is automatically configured when you open a port on a serial interface Setting the Transceiver Mode with DeviceloControl The NI Serial server software extends the DeviceIoControl Windows function for programming the transceiver control mode To program the transceiver control mode using DeviceIoCont rol complete the following steps 1 Add the following lines to your source code include lt winioctl h gt define IOCTL SERIAL SET TRANSCEIVER _MODE CTL CODE FILE DEVICE SERIAL PORT 37 METHOD BUFFERED FILE ANY ACCESS ENET 232 and ENET 485 for Windows NT 4 0 6 8 www ni com Chapter 6 Using Your Serial Device Server 2 Use the Win32 function DeviceIoControl as follows a Use the defined control code value listed in step 1 to set the transceiver mode b Use the input buffer values unsigned long listed in Table 6 2 for programming different transceiver modes Table 6 2 DeviceloC
63. nal Instruments Corporation vii ENET 232 and ENET 485 for Windows NT 4 0 Contents Chapter 4 Serial Port Configuration Adding a New Serial Interface cissccccsecsscscsesectsadeecuscesseeades csisdbetnecastiessnechsasersnetaanseesads 4 1 Viewing or Changing Communication Port Settings eesssesseeessesrsresrsrrsreersrrsrerrsreere 4 3 COM Port Numbers 2022s didnt eset a e a aE 4 5 Transceiver Mode voet oepa techs chvtedh a a check ET iaai 4 5 Chapter 5 Verify the Installation Running the Serial Device Server Diagnostics s essssessssessesrsresreresresrsrrntesrsteersreerees 5 1 Connecting Senal Device Sinner E EE R E AE E ES tases 5 3 Chapter 6 Using Your Serial Device Server General Programming Requirements ssssesseessseseseesrertsresrrstsrestestsresrsresrerestesrerrsreetse 6 1 DSTT DHCP E E E EE ONE O AE N ET 6 2 Using the CFG RESET Switch isiccc cscs esis nia a aA E aaea ETE 6 3 Using the CFG RESET Switch during Operation eee eects eeeeeees 6 3 Using the CFG RESET Switch at Power On eee csecseceeeneeeeeeeeeenees 6 4 Updating the Firm Wares tc ccccsivcscsvecse destvertexsceeseseesnsveevissdeeep spsueensUacetcvdeenespssevsstoseaesseetes 6 5 Configuring Transceiver Modes on the ENET 485 ccccccccccecceesecesceseneeneseseeeeeses 6 6 Bour Wire Modein tennie sheen iveeg chats Gece eaves estate steak oeeey cas evens spas bea 6 7 Two Wire Mode DTR with Echo o00 ei eeeeeeseseesecseceseeseeeaeeneeeaeeneeeaeene
64. nd DNS does not occur In this situation DHCP assigns an address to the device but you cannot communicate to it using the hostname you assigned Your network administrator may have to manually insert the hostname into the DNS table Alternatively you can use the NI Ethernet Device Configuration utility to determine the hostname associated with your assigned IP address and change the hostname to match the DNS entry ENET 232 and ENET 485 for Windows NT 4 0 6 2 www ni com Chapter 6 Using Your Serial Device Server Because there are many other possible reasons for failure contact your network administrator if you are having problems getting DHCP to work When you can use DHCP and DNS successfully you can use the hostname form of the IP address to communicate with your product even if the numerical IP address changes with successive reboots If you are setting up a small network for your instrumentation system it is recommended to use static IP addresses because they are easier to implement and maintain In this system you can safely use the numerical form of the IP address to communicate with your product because the address is unlikely to change Small networks are less likely to have domain name services available that would resolve the hostname into a numerical IP address Using the CFG RESET Switch The Configuration Reset CFG RESET switch is a recessed switch located beside the ENET connector on the rear panel Refer to Figure 2
65. nd the Product Support Department can answer your questions more accurately and efficiently Do not switch off power to your serial device server before recording the flashing PWR RDY LED pattern PWR RDY LED signaling can report up to 81 different errors The errors are numbered from 11 to 99 and are reported through sequences of PWR RDY LED flashes Ai Note There is no zero in any error message The maximum error message number is 99 This means that error message numbers 0 10 20 30 40 50 60 70 80 and 90 are not possible National Instruments Corporation B 1 ENET 232 and ENET 485 for Windows NT 4 0 Appendix B PWR RDY LED Signaling Step 1 Count the Long Flashes A three second interval during which the PWR RDY LED is yellow separates each repetition of the sequence The sequence begins with a series of long one second flashes that is one second red one second yellow These long flashes represent the digit in the tens column There can be one to nine long flashes which represent digits 1 through 9 For example one long flash represents the digit 1 in the tens column and nine long flashes represent the digit 9 in the tens column Step 2 Count the Short Flashes The long flashes are followed by shorter flashes each short flash lasts about one fifth of a second that is one fifth of a second red one fifth of a second yellow These short flashes represent the digit in the ones column Again there can be one to ni
66. nded that you exit all Windows programs before running this Setup program Click Cancel to quit Setup and then close any programs you have running Click Next to continue with the Setup program WARNING This program is protected by copyright law and international treaties Unauthorized reproduction or distribution of this program or any portion of it may result in severe civil and criminal penalties and will be prosecuted to the maximum extent possible under law Cancel Figure 2 1 NI Serial Server Setup Screen National Instruments Corporation 2 1 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 2 Installation Installing the Serial Device Server Complete the following steps to install your serial device server Step 1 Verify the Voltage Rating The serial device server has either a 100 120 VAC or 220 240 VAC power supply Before you use your serial device server verify that the voltage rating listed on the external power supply matches the voltage that is supplied in your area VAN Caution If you do not use the power supply included in your kit ensure that you do not operate your serial device server at any voltage other than the one specified on the rear panel Doing so could damage the unit Step 2 Record the Serial Number Ethernet Address and Default Hostname When you configure the serial device server for use on your network you will need to differentiate it from other network devices
67. ne flashes which represent the digits 1 through 9 For example one short flash represents the digit 1 in the ones column and nine short flashes represent the digit 9 in the ones column Using this method the PWR RDY LED flashes the following sequence to represent error message 11 lt three seconds yellow gt lt one long red flash gt lt one short red flash gt lt three seconds yellow gt The PWR RDY LED flashes the following sequence to represent error message 31 lt three seconds yellow gt lt three long red flashes gt lt one short red flash gt lt three seconds yellow gt Step 3 Record Your Error Message Number When you have computed your error message number write it down and also note the ON OFF state of the LINK TX and RX LEDs Have this information available when calling National Instruments ENET 232 and ENET 485 for Windows NT 4 0 B 2 www ni com Troubleshooting and Common Questions This appendix describes how to troubleshoot problems and answers some common questions The information in this appendix is arranged in the following sections e Troubleshooting Network Problems e Troubleshooting Hardware Problems e Troubleshooting Diagnostic Messages e Common Questions Troubleshooting Network Problems My Device Does Not Appear in the NI Ethernet Device Configuration Utility e Allow at least 90 seconds after powering on the device Confirm that the unit is connected to the net
68. nfiguration of your serial ports 1 Log in as Administrator or as a user who has administrator privileges 2 Select Start Settings Control Panel NI Ports A list of installed National Instruments ports appears as shown in Figure 4 4 National Instruments Ports NI PCI 485 4 gt N I PCI 485 4 NLL PCI 485 4 MENET Eh ENET ZDA ENET 232 4 PCMCIA 485 v Figure 4 4 NI Ports Serial Configuration Utility National Instruments Corporation 4 3 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 4 Serial Port Configuration 3 Select the port that you want to configure and refer to the following instructions e To remove hardware information about the port from Windows NT click Delete To view or change the port settings click Settings A screen similar to the following appears General Port Settings Ianscenvyer i Ge MV HEO Enabled E gliele MGa Lavi slie hei ansnit iG Sizer HESGUTCES Figure 4 5 General Port Settings Window ENET 232 and ENET 485 for Windows NT 4 0 4 4 www ni com Chapter 4 Serial Port Configuration COM Port Number Use the COM Port Number control to change the logical COMx name of the selected port Transceiver Mode Use the Transceiver Mode list box to change the transceiver mode This mode applies only to ENET 485 serial device servers For more information about transceiver modes refer to Chapter 6 Using Your Serial Device Server
69. ng 10 to 90 noncondensing conditions Storage temperature s 55 to 85 C Relative humidity storage 5 to 90 noncondensing conditions EM 3 048 Sd bse ee ee a FCC Class A Verified Physical Characteristics Overall case size dimensions 21 0 by 12 4 by 3 7 cm 8 25 by 4 89 by 1 44 in Case material onccion Hard plastic with metal baseplate Weight sirais naarn oa apoeni asasta ta 394 g 0 87 1b National Instruments Corporation E 1 ENET 232 and ENET 485 for Windows NT 4 0 Appendix E Specifications Software Characteristics Space required for NI Serial server SOMWALE i eccsidleedh stag lates Rages Ent 2 MB Electrostatic Discharge Protection Non isolated deVices ceeeeeeseeseeeseeees 1 5kV Network Specifications Ethernet connector 0 0 eee eeeeeeeeeeeeeeeneeees RJ 45 Connection type cece eeeeeeeseeeseereee TEEE 802 3 compliant 10BaseT 10 Mb s 100BaseT 100Mb s DUplex mod s aeren Half duplex Serial Specifications Serial connectors ereere DB 9 Maximum serial transfer rate RS 485 oi oriri eisiaa 460 8 kb s RS 232 vecssi seers nsa es 230 4 kb s RS 232 port type eeun renni DTE 1 Actual speed may vary considerably from speed shown due to system network and instrumentation capabilities ENET 232 and ENET 485 for Windows NT 4 0 E 2 www ni com Technical Support Resources This appendix describes the comprehensive resources available to you
70. nications An unpredictable delay is associated with using the remote serial ports Applications may require longer serial timeouts to compensate for this delay However different applications handle serial timeouts differently and each must be adjusted individually to account for your network conditions What do I do if the Serial Device Server Diagnostics utility fails with an error Refer to the troubleshooting sections of this appendix for specific information about what might cause the diagnostics utility to fail If you have already completed the troubleshooting steps contact National Instruments How many serial interfaces can I configure for use with my NI Serial server software for NT Currently the NI Serial server software for NT can be configured to communicate with up to 256 serial ports National Instruments Corporation C 9 ENET 232 and ENET 485 for Windows NT 4 0 Appendix C Troubleshooting and Common Questions How do I communicate with my instrument over the serial bus Refer to the documentation that came from the instrument manufacturer The command sequences you use are dependent on the specific instrument The documentation for each instrument should include the serial commands you need to communicate with it Why does the uninstall program leave some components installed The Uninstall program removes only items that the installation program installed If you add anything to a directory that the install
71. on two wires wire A and wire B A logical is represented by the voltage on line A being greater than the voltage on line B A logical 0 is represented by the voltage on line A being less than the voltage on line B Differential voltage transmission creates a signal that is more immune to noise as well as voltage loss due to transmission line effects Thus you can use RS 422 for longer distances up to 4 000 ft and greater transmission speeds up to 10 Mb s than RS 232 As specified in the E A 485 Standard Standard for Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems RS 485 expands on the RS 422 standard by increasing the number of devices you can use from 10 to 32 and by working with half duplex bus architectures Unlike the RS 422 standard RS 485 addresses the issue of using multiple transmitters on the same line RS 485 defines the electrical characteristics necessary to ensure adequate signal voltages under maximum load and short circuit protection RS 485 can also withstand multiple drivers driving conflicting signals at the same time ENET 232 and ENET 485 for Windows NT 4 0 D 2 www ni com Appendix D Serial Port Information Serial Communication Issues This section explains some serial communication issues including duplex architectures termination methods bias resistors and types of connecting equipment Duplex Architectures Duplex refers to the means of bandwidth
72. ontrol Function Input Values DevicelIoControl Transceiver Mode Function Input Value Four wire mode 128 Two wire mode DTR with echo 129 Two wire mode DTR controlled 130 Two wire mode Auto Control 131 For example to set two wire Auto Control mode use the following code ULONG TranceiverMode 131 DeviceloControl hDevice IOCTL SERIAL SET TRANSCEIVER MODE PVOID amp TransceiverMode sizeof ULONG lpOutBuffer nOutBufferSize lpBytesReturned lpOverlapped Changing the Bias Resistors on the ENET 485 This section explains the functionality of the bias resistors on the ENET 485 and describes the method for changing them Functionality of Bias Resistors A transmission line enters an indeterminate state if no nodes are transmitting on it This indeterminate state can cause the receivers to receive invalid data bits from noise picked up on the cable To prevent a line from receiving these data bits force the transmission line into a known state The ENET 485 Series contains two 620 Q bias resistors on the transmission line These resistors create a voltage divider that forces the voltage between the differential pair to be greater than 200 mV the threshold voltage for the receiver National Instruments Corporation 6 9 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 6 Using Your Serial Device Server Figure 6 2 shows a transmission line using bias resistors 5 620 Q Bi
73. orm used in reference to a communication port CTS Clear To Send DB xx subminiature D connector where xx is the number of pins DCD Data Carrier Detect DCE Data Communications Equipment or Data Circuit Terminating Equipment National Instruments Corporation G 1 ENET 232 and ENET 485 for Windows NT 4 0 Glossary DHCP DSR DNS DTE DTR duplex EIA EEPROM EMI FCC FIFO ft IRQ ISA LED MB Dynamic Host Configuration Protocol Data Set Ready domain name server Data Terminal Equipment Data Terminal Ready the overscore denotes that the signal is active low the means of bandwidth usage in a serial system Electronic Industries Association electrically erasable programmable read only memory electromagnetic interference Federal Communications Commission First In First Out feet grams ground Handshake Input Handshake Output hertz Institute of Electrical and electronic Engineers inches input output Internet Protocol interrupt request Industry Standard Architecture meters light emitting diode pounds megabytes of memory ENET 232 and ENET 485 for Windows NT 4 0 G 2 www ni com NIC PC RAM RI RX RXD RTS TCP TX TXD UART VAC VDC Winl6 Win32 Glossary network interface card personal computer random access memory Ring Indicator Receive Receive Data the overscore denotes that the signal is active low Request to Send seconds Transmission Control Protocol Transmit Tran
74. ows NT 4 0 l 2 DNS table manually configuring C 2 manually inserting hostname 6 2 using NSLookup C 2 DOS applications using with serial device server C 10 DTE vs DCE D 6 DTE to DCE interface D 6 straight through cabling in figure D 6 DTE to DTE interface D 6 null modem cabling in figure D 6 duplex architectures full duplex D 3 half duplex D 4 overview D 3 E electrical characteristics E 1 electrostatic discharge protection E 2 ENET 485 advanced transceiver control for transceiver control modes table 6 7 two wire mode auto control 6 8 two wire mode DTR controlled 6 7 two wire mode DTR with Echo 6 7 changing bias resistors 6 9 configuring transceiver modes 6 6 connecting two or four wire devices D 9 setting transceiver control mode 6 8 environmental characteristics E 1 error messages example B 2 interpreting B 1 recording B 2 Ethernet connecting to serial device server 2 3 NI Ethernet Device Configuration utility 3 1 Ethernet address location 2 2 www ni com F failure cannot connect to network C 5 connecting to serial device server C 6 red PWR RDY LED C 4 using Serial Device Server Diagnostics utility C 9 firmware determining version C 7 updating 6 5 firmware update utility before using 6 5 running 6 5 when to use 6 5 four wire mode 6 7 front panel figure 1 4 full duplex D 3 full duplex system figure D 4 G gateway settings assigning 3 7
75. pean Union Compliance to EEC Directives Readers in the EU EEC EEA must refer to the Manufacturer s Declaration of Conformity DoC for information pertaining to the CE Mark compliance scheme The Manufacturer includes a DoC for most every hardware product except for those bought for OEMs if also available from an original manufacturer that also markets in the EU or where compliance is not required as for electrically benign apparatus or cables Certain exemptions may apply in the USA see FCC Rules 15 103 Exempted devices and 15 105 c Also available in sections of CFR 47 The CE Mark Declaration of Conformity will contain important supplementary information and instructions for the user or installer Contents About This Manual CGOTVEME OTIS 355255 os seh oh cages a ndeda cuasvessbecueee seed E S xi Related Doc me ntatiOn narn aa a E AE aaae xii Chapter 1 Introduction How to Use Fhis Manual 23 saesae naa a cad betas sed ten S A S S es 1 1 What You Need to Get Started 0 0 cccccccccccssscccccesssseeecccesssseeeeesssseeeceesesseeceesesseeeeeens 1 2 Optional Equipment iesene oea haptics nisi neh etd bid att Nin nian E nears 1 2 Serial Device Server OVELrVieW ccccccccceessscccecessssceccceessceecceessaseeecesensseeececestseeeeseetaee 1 3 Semnal Port Overview sis hoa ea ae Seddneee Sed endo Hees 1 3 Feature OVeErVieW cccccccccssssscceesssssceccceseseececesssseeecceessseececeensseeecesssaseeecesens
76. quipment generates and uses radio frequency energy and if not installed and used in strict accordance with the instructions in this manual and the CE Mark Declaration of Conformity may cause interference to radio and television reception Classification requirements are the same for the Federal Communications Commission FCC and the Canadian Department of Communications DOC FOR HOME OR OFFICE USE Changes or modifications not expressly approved by National Instruments could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Canadian Department of Communications This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe A respecte to
77. ramming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions and code excerpts National Instruments Corporation xi ENET 232 and ENET 485 for Windows NT 4 0 About This Manual monospace italic Italic text in this font denotes text that is a placeholder for a word or value that you must supply serial device server Serial device server refers to all versions of the ENET 232 and ENET 485 Related Documentation The following documents contain information that you might find helpful as you read this manual ANSI EIA 232 D Standard Interface Between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange ANSI TEEE Standard 802 3 1988 Information Processing Systems Local Area Networks Part 3 EIA RS 422 A Standard Electrical Characteristics of Balanced Voltage Digital Interface Circuits EIA 485 Standard Standard for Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems Microsoft Win32 Software Developer Kit Online Documentation for Win32 Overviews Win32 Reference and Microsoft Windows NT System Guide Microsoft Corporation ENET 232 and ENET 485 for Windows NT 4 0 xii www ni com Introduction This chapter lists what you need to get started and optional eq
78. rd parties or other events outside reasonable control Copyright Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation Trademarks ComponentWorks CVI LabVIEW Lookout Measurement Studio National Instruments and ni com are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS 1 NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN 2 IN ANY APPLICATION INCLUDING THE ABOVE RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY COMPUTER HARDWARE MALFUNCTIONS COMPUTER OPERATING SYSTEM SOFTWARE FITNESS FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES
79. rporation 6 5 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 6 Using Your Serial Device Server 2 Enter the IP address or the hostname of the serial device server in the IP address or hostname edit box An example of an IP address is 137 65 220 40 An example of a hostname is charlie 3 Enter the full path of the binary file where the firmware is located in the EEPROM binary image filename edit box You also can click Browse to locate the file 4 Click Update to update the firmware The NI Ethernet Device Firmware Update utility communicates with the specified serial device server to verify the box has no open network connections and determine the current version of the firmware in the unit A dialog box reports that the update utility is searching for the Ethernet device 5 The utility prompts you to confirm the change you are about to perform Click OK to continue As the update utility transfers the firmware image to your serial device server the Update Progress status bar fills and the Current status box describes each step in the process The Current status box reports whether the firmware update completed successfully or failed The serial device server automatically reboots with the new firmware in effect 6 Click Exit to close the NI Ethernet Device Firmware Update utility Configuring Transceiver Modes on the ENET 485 Sy Note Transceiver modes apply only to the ENET 485 Series serial device server This informat
80. single twisted pair of wires for communication in both directions so you must connect both the transmitter and the receiver at each end of the same pair of wires For example to connect an RS 485 data acquisition device to a port on your ENET 485 using half duplex communication you need a single twisted pair of wires At the ENET 485 connect the TXD and RXD signals pins 8 and 4 on a DB 9 connector pins 5 and 20 on a DB 25 connector together and to one wire Connect the other end of this wire to both the TXD and RXD signals on the data acquisition device Use the same method to connect the TXD and RXD signals pins 9 and 5 on a DB 9 connector pins 22 and 7 on a DB 25 connector to the second wire For information about setting the transceiver mode for two wire communication refer to Chapter 6 Using Your Serial Device Server National Instruments Corporation D 9 ENET 232 and ENET 485 for Windows NT 4 0 Specifications This appendix describes the characteristics of the serial device server and the NI Serial server software along with the recommended operating conditions Electrical Characteristics Power supply unit 100 120 VAC wu eeeeeeeeeee 10 60 Hz 220 240 VAC iia 10 50 Hz Current requirements 100 120 VAC Wo ccceeceseeeees 125 mA maximum 90 mA typical 220 240 VAC rraian aa 85 mA maximum 60 mA typical Environmental Characteristics Operating temperature 40 to 70 C Relative humidity operati
81. smit Data the overscore denotes that the signal is active low Universal Asynchronous Receiver Transmitter volts volts alternating current volts direct current describes a 16 bit Windows application describes a 32 bit Windows application National Instruments Corporation G 3 ENET 232 and ENET 485 for Windows NT 4 0 Index A adding a new serial interface 4 1 advanced transceiver control for the ENET 485 four wire mode 6 7 setting transceiver control mode 6 8 transceiver control modes table 6 7 two wire mode auto control 6 8 two wire mode DTR controlled 6 7 two wire mode DTR with Echo 6 7 baud rate maximum C 9 setting C 9 bias resistors changing 6 11 functionality 6 9 location 6 12 using in transmission line figure 6 10 C cable connectors DB 25 D 8 DB 9 D 7 cables connecting 2 3 verifying proper Ethernet cable type C 6 CFG RESET switch if hosts are connected 6 3 location 6 3 resetting default network configuration 2 5 using at power on 6 4 using during operation 6 3 COM port number changing 4 5 National Instruments Corporation communication over the serial bus C 10 communication port settings adding a new serial interface 4 1 configuring 4 1 viewing or changing 4 3 connecting cables 2 3 5 3 serial devices 2 4 5 3 two wire devices D 9 conventions xi cover removing figure 6 11 CreateFile API failure C 9 restrictions C 9 D
82. ss assigned to your serial device server When your device responds to the ping requests repeat this procedure but this time using the hostname ping hostname If your device fails to respond when using the hostname the DNS entry for the device is incorrect If the network parameters were statically manually assigned the hostname must be manually entered in your network s Domain Name Server DNS table before you can use the hostname to communicate with your device Request your network administrator to enter this information If the network parameters were automatically assigned using DHCP run the NI Ethernet Device Configuration utility Part of the discovery process confirms that the hostname is properly registered with DNS for units using DHCP Refer to Chapter 3 Ethernet Configuration for more information about the NI Ethernet Device Configuration utility You also can manually check that the device s hostname has been entered in the DNS table using NSLookup This is a network utility that queries the DNS for entries in the DNS table You can use NSLookup to determine the hostname associated with any particular IP address listed in the DNS table Find the directory where nslookup exe is installed and type in the following command nslookup IPaddress where IPaddress is the IP address you want to look up ENET 232 and ENET 485 for Windows NT 4 0 C 2 www ni com Appendix C Troubleshooting and Common Questions Alternat
83. tells you to assign the IP address manually complete the following steps to configure the IP address settings 1 Select Start Programs National Instruments Serial Server Ethernet Device Configuration SYNI Ethernet Device Configuration IP address hostname Ethernet address Serial number Model Comment ar nienetBSB76A4 00 80 2 ff 00 8d OOBSB76A GPIB ENET 100 ae 130 164 54 81 00 80 2f ff 00 5a OOBSB 784 ENET 232 2 BLD 3 UPPER gt Unconfigured 00 80 2f ff 00 80 OOBSB734 ENET 485 2 aF nienetB SBS04 00 80 2 ff 00 71 OOBSB804 ENET 485 2 Busy 00 80 2 ff 00 76 OOBSB 704 ENET 232 4 BLD 2LOWER a 130 164 54 81 00 80 2f ff 00 73 OOBSB 714 ENET 232 4 Properties Refresh Figure 3 1 NI Ethernet Device Configuration Utility 2 The NI Ethernet Device Configuration window displays a list of devices sorted by model The devices displayed can be in one of four possible states as indicated in the IP address hostname column e A hostname indicates the device has successfully been configured by DHCP e A numerical IP address indicates the device has successfully been configured with a static IP address e Unconfigured indicates the device is configured to use DHCP but DHCP failed to attain network parameters e Busy indicates the device is configured to use DHCP and currently is attempting to acquire network parameters ENET 232 and ENET 485 for Windows NT 4 0 3 2 www ni com National Instrumen
84. terminating resistor at only the first and last instruments The terminating resistor should match the characteristic impedance of the transmission line typically 100 to 120 Q You can order an optional DB 9 RS 485 termination connector that contains embedded terminating resistors for easy termination from National Instruments For ordering information contact National Instruments Figure D 3 shows a multidrop network using terminating resistors MASTER oH Slave 1 Slave 2 Slave n JN AN AN 1002 g 100 Figure D 3 Multidrop Network Using Terminating Resistors National Instruments Corporation D 5 ENET 232 and ENET 485 for Windows NT 4 0 Appendix D DTE vs DCE Serial Port Information In the RS 232 specification DTE Data Terminal Equipment and DCE Data Communications Equipment refer to the types of equipment on either end of a serial connection In general DTE and DCE refer to computer equipment and modems respectively Because the RS 232 specification mainly involves connecting a DTE directly to a DCE and vice versa the pinouts are defined so that cabling is simple That is a cable connects a computer to a modem by wiring pin to pin 1 pin 2 to pin 2 and so on This method is known as straight through cabling Figure D 4 shows straight through cabling in a DTE to DCE interface Pin 2 Pin 3 PPn Pin 2l P Pin 2 TD _ lo DCE DCE _
85. the date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instruments believes that the information in this document is accurate The document has been carefully reviewed for technical accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader shou
86. the diagnostics program again If this problem persists contact National Instruments Could not locally access the serial port This error message occurs in response to an error with the Windows NT driver Reinstall the software as described in Chapter 2 Installation and try the diagnostics program again If this problem persists contact National Instruments Common Questions How can I determine which type of serial hardware I have installed To display a list of all installed communication ports select Start Settings Control Panel Ports To display a list of installed National Instruments serial ports select Start Settings Control Panel NI Ports How can I determine which version of the NI Serial server software I have installed The Readme txt file included with the NI Serial server software for Windows NT gives the version of the software To open the file select Start Programs National Instruments Serial Server Readme txt How can I determine which version of firmware is running on my serial device server Use the NI Ethernet Device Configuration utility to view the firmware version of the serial device server Complete the following steps 1 Verify that the specific serial device server is located on the same subnet as your computer 2 To open the NI Ethernet Device Configuration utility select Start Programs National Instruments Serial Server Ethernet Device Configuration 3 Select your serial
87. tion National Instruments Corporation C 3 ENET 232 and ENET 485 for Windows NT 4 0 Appendix C Troubleshooting and Common Questions PWR RDY LED Continues to Flash after 90 Seconds If the PWR RDY LED continues to flash rapidly 90 seconds after power on the serial device server is unable to obtain its network parameters from the network using DHCP In this case have your network administrator verify your network parameters PWR RDY LED is Steady Red Verify that the CFG RESET button is not pressed or stuck If the LED remains red the device encountered an unrecoverable error Contact National Instruments Ethernet LEDS LINK TX and RX Are Blinking in Unison An internal network configuration error has occurred Contact National Instruments Serial Application Cannot Open Port e Confirm that no other users or applications are already using the port The port is closed when its associated port LED is off e Verify that the device is not in network configuration mode or in the process of booting indicated by the rapid blink of the PWR RDY LED e Verify that the device and COM ports are properly configured Run the Serial Device Server Diagnostics utility as described in Chapter 5 Verify the Installation Cannot Send Receive Data or Serial Data is Scrambled e Verify that the baud rate data bits stop bits and parity settings are correct for both the serial device server and the target device e Confirm you
88. tions with clients and servers Lookout uses TCP IP networking and the Internet to implement systems on corporate and factory Ethernet networks Serial driver objects that do not use external port handlers can use the same COM port Measurement Studio bundles LabWindows CVI for C programmers ComponentWorks for Microsoft Visual Basic programmers and ComponentWorks for Microsoft Visual C programmers Measurement Studio is designed for building measurement and automation applications with the programming environment of your choice e LabWindows CVI is an interactive ANSI C programming environment designed for building virtual instrument applications LabWindows CVI delivers a drag and drop editor for building user interfaces a complete ANSI C environment for building your test program logic and a collection of automated code generation tools as well as utilities for building automated test systems monitoring applications or laboratory experiments ENET 232 and ENET 485 for Windows NT 4 0 1 6 www ni com Chapter 1 Introduction ComponentWorks for Visual Basic is a collection of ActiveX controls designed for building virtual instrumentation systems Based on ActiveX technology ComponentWorks controls are configured through simple property pages You can use the ComponentWorks GPIB Serial and VISA I O controls and property pages to set up communication with your instruments ComponentWorks for Visual C takes advantage of integrate
89. tors on the ENET 485 General Programming Requirements The NI Serial server software is fully integrated into the standard Windows NT communications software NI serial ports are used like any other Windows NT communications COM port Windows NT has standard communication functions for use within either Win16 or Win32 applications When you develop your application remember that you must use the standard Microsoft Windows serial communication functions For information about Microsoft Windows serial communication functions refer to the Win32 Software Development Kit and to the Win32 Overviews and Win32 Reference online help If you have LabVIEW Measurement Studio or another National Instruments application software product and want to use it with your serial device server refer to your product documentation for information about serial I O functions National Instruments Corporation 6 1 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 6 Using Your Serial Device Server Using DHCP The Dynamic Host Configuration Protocol DHCP is designed for large networks in which networking devices are transient and network parameters cannot be statically assigned and thus tied to specific devices DHCP eases the addition of networking devices onto a network by having a server assign necessary network parameters including the IP address the netmask and router information to a newly attached network device Optionally if the devic
90. ts Corporation Chapter 3 Ethernet Configuration Click Properties for any of the following reasons You need to configure an unconfigured IP address If this is the first time you are running the configuration utility and DHCP is not present you should see an entry for your unconfigured serial device server Select it then click Properties to configure your device You need to change the current network parameters You previously used DHCP but it is no longer available You are using DHCP and need to change the hostname of the serial device server An exclamation point is present next to the IP address hostname indicating a configuration problem Refer to the Verifying the Hostname section for help fixing this problem You want to change the Comment field for the device Click Refresh if you do not see your serial device server in the list of Ethernet devices or to discover a device that you recently added to the network Click Exit if you are using DHCP and you do not need to change the hostname of the serial device server or if you are finished using the NI Ethernet Device Configuration utility 3 3 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 3 Ethernet Configuration Configuring the Network Settings 1 When you select Properties from the NI Ethernet Device Configuration window a Properties window for your serial device server appears similar to the example shown in Figure 3 2 Y ENET 485 2
91. ts office or the source from which you purchased your National Instruments product s to obtain support For telephone support in the United States dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Calgary 403 274 9391 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 New Zealand 09 914 0488 Norway 32 27 73 00 Poland 0 22 528 94 06 Portugal 351 1 726 9011 Singapore 2265886 Spain 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2528 7227 United Kingdom 01635 523545 ENET 232 and ENET 485 for Windows NT 4 0 F 2 www ni com Glossary Prefix Meaning Value p pico 10 7 n nano 10 9 u micro 10 6 m milli 10 3 c centi 10 2 k kilo 103 M mega 106 G giga 10 t tera 10 F degrees percent Q ohms A amperes ANSI American National Standards Institute b bits B bytes baud signaling rate of a line in transitions per second C Celsius COM Computer Output Microf
92. uipment you can order and briefly describes the serial device server and the NI Serial server software How to Use This Manual fe Gather What You Need to Get Started Install NI Serial Software Connect Power and Chapter 1 Ethernet Cables Chapter 2 Power on Serial Device Server Acquired network parameters Configure the Serial Port Use Ethernet Configuration Utility Chapter 3 Chapter 4 y m the Installation ep Troubleshooting een Serial Devices to een Ports Review Programming Requirements y Write Application Program Chapter 5 Chapter 6 National Instruments Corporation 1 1 ENET 232 and ENET 485 for Windows NT 4 0 Chapter 1 Introduction What You Need to Get Started Before you install your serial device server and the NI Serial server software make sure you have all of the following items Q Q Q E Windows NT 4 0 with Service Pack 3 or higher installed on your computer TCP IP protocol installed on your computer One of the following serial device servers which is included in your kit ENET 232 Series two or four port ENET 485 Series two or four port One of the following power supplies which is included in your kit US 120 VAC 9 VDC 1 A external power supply International 230 VAC 9 VDC 1 A external power supply One of the following Category 5 twisted pair network cables
93. utes les exigences du R glement sur le mat riel brouilleur du Canada Class B Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Canadian Department of Communications This Class B digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe B respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada Euro
94. vice on your network An IP address typically is represented as four decimal numbers separated by periods for example 130 164 54 200 Refer to the next section Choosing a Static IP Address e Subnet mask A code that helps the network device determine whether another device is on the same network or a different network e Gateway IP The IP address of a device that acts as a gateway which is a connection between two networks If your network does not have a gateway set this parameter to 0 0 0 0 e DNS Server The IP address of a network device that stores hostnames and translates them into IP addresses If your network does not have a DNS server set this parameter to 0 0 0 0 Choosing a Static IP Address For a Network Administered by a Network Administrator If you are adding the serial device server to an existing Ethernet network you must choose IP addresses carefully Consult with your network administrator to obtain an appropriate IP address Ask the administrator to assign a static IP address to your serial device server Also ask the network administrator to assign the proper subnet mask gateway and DNS server addresses For a Network without a Network Administrator If you are assembling your own small Ethernet network you can choose your own IP addresses The format of the IP addresses is determined by the subnet mask You should use the same subnet mask as the computer you are using to configure your serial device
95. work on the same subnet as the host computer e Click Refresh on the utility window to update the current network information e Refer to Chapter 3 Ethernet Configuration for more information about the NI Ethernet Device Configuration utility Network Has DHCP But Does Not Configure The Device s Network Parameters e Use the NI Ethernet Device Configuration utility to confirm that your device is set to use DHCP e Have your system administrator confirm that your network s DHCP server is functional and that there are available IP addresses National Instruments Corporation C 1 ENET 232 and ENET 485 for Windows NT 4 0 Appendix C Troubleshooting and Common Questions Cannot Change Network Settings Verify there are no open network connections All port LEDs should be off Confirm the device is in network update mode Press and hold the CFG RESET switch for three seconds to enter network update mode For more information refer to the Using the CFG RESET Switch section in Chapter 6 Using Your Serial Device Server Cannot Access Device When Using Hostname Verify the device is present on the network by pinging the IP address of your device Ping is a network utility that sends a packet to a device host on the network then waits for it to be echoed back which indicates an active device host Find the directory where ping exe is installed and type in the following command ping IPaddress where IPaddress is the IP addre

ENET-232 Series and ENET-485 Series User Manual for Windows

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