PRV DDE I/O Server
Contents
1. 9 3 2 HOV TO INSTALL sie 9 3 2 1 Setup Of INE file aida 9 3 222 VELAI AN 9 3 2 3 Files in the DDE I O Server installation 4 9 4 HARDWARE REQUIREMENTS csssscssssssessessssessessssessessssessessssessessssessessssessersesessersesesserses 10 4 1 HARDWARE REQUIREMENTS DIRECT METHOD 1 c cccccccscsessstceeececsesssaececececeessaeeesececeenenaees 10 4 1 1 10 4 2 HARDWARE REQUIREMENTS MULTIDROP METHOD 2 11 4 3 HARDWARE REQUIREMENTS TCP IP METHOD 3 2 0000000 0 21000 0 12 4 4 HARDWARE REQUIREMENTS FOR THE 0 22200 0 0 0 000 011 13 4 5 PC HARDWARE KEY 2 040200000000000 00 000000000000 13 4 5 1 Other licensing method Sase nioten oe e a a RH Been abet e a 13 4 5 2 License 5 nidiir eisni sisii i iis e eo e AE EEEE E AE aaee iert ELE ies 13 4 5 3 14 5 SOFTWARE REQUIREMENT sssssssssssssssssssssssssesssssssesssssssessssessersssessessssessessssessessesesserses 15 5 1 RESOURCE REQUIREMENTS2. 33 40 63 A AREA eine 33 11 W WLOGGER 34 12 TIME SWITCH PROGRAM TSP ssscsssssscscssesessessesecsessececsessesecnessesecneseesesessesessesseseenees 35 13 PERFORMANCE 36 132 DIFFERENT LINK vsssavnonsavepssenedavacsbastuatsasoanteusasepsbenaaaneosbesves 36 13 1 1 Hot Link Advise Loop DDE 36 IZA2 Cold Fink DDE Peek tia hese fae ean nace 36 IZA3 36 13 2 NEW ITEMS 25 0 36 13 3 EVENT BASED ITEMS RESPONSE TIME cepos terioa ae niite Ea Ei ARER a EE EENE Eyen 36 TroSoft PRV DDE I O Server Installation and User Manual 5 License agreement IMPORTANT READ THE FOLLOWING LICENSE AGREEMENT CAREFULLY BEFORE INSTALLING AND OR USING THE SOFTWARE By installing and or using the software you indicate your acceptance of the following TroSoft AB License Agreement Agreement If you do not agree to the terms of this Agreement promp
3. Item name will expand to valid 040 040 HW YES 040 040 HW YES 40 040 HW YES 040 HW E 040 HW YES 040 HW P 040 HW YES 40 01 040 DEL01 YES 040 ERSTA 040 ERSTA YES SYSNUS SYSNUS NO 10 As 10 As NO PLT1 PLT1 HW YES PLT1 LCMO YES PLT1_LCM0_S PLT1 LCMO YES PLT1 LCMO S PLT1 LCMO YES Generally no system parameters are accesable i e SYSNUS SYSVER DATE TIME etc All point parameters are accesable All dots and are exchangeable with underscores _ and the address will be automatically prefixed with a dollar sign 10 2 Polled Items If the Item name is suffixed with P or _P it will always be treated as an polled Item i e the value is continously asked for by the DDE I O Server If there are no suffix at all the point will be set to be polled or event based depending of the INI file setting only true for the above mentioned parameters all others are always polled 10 2 1 Depends of the load of the PRV and the PRV DDE I O Server for that Topic New Items always gets the highest priority An EKL X returns about 1 2 item per second packet of 5 which gives a response time about 1 5 seconds for 5 new Items Response time to client requests TroSoft PRV DDE I O Server Installation and User Manual 31 10 3 Event based Items If the Item name is suffixed with E or _E it will always be treated as an event based Item i
4. 15 5 2 LIMITATIONS E She E 15 955 16 61 CONFIGURATION OF THE DDE I O SERVER DIRECT METHOD 1 16 6 2 CONFIGURATION OF THE DDE I O SERVER MULTIDROP METHOD 2 16 6 2 1 Configuration of the KD485 ADE Multidrop 17 6 2 2 18 6 3 CONFIGURATION OF THE DDE I O SERVER TCP IP METHOD 3 19 6 3 1 Configuration of the Terminal Server 000020 01 0 0 000000000 19 6 4 5 EE A EEE 19 6 4 1 19 6 4 2 20 6 4 3 PrOtOCOIT ie 20 6 4 4 20 TroSoft PRV DDE I O Server Installation and User Manual 3 6 4 5 ac ed
5. DDE I O Server can read from and write to almost any parameter the The Server is able to communicate with the PRV using three different methods 1 Through a standard RS 232 serial port directly connected to of the terminal ports A short range modem may be used to improve cable length This method is hereafter named Direct 2 Using KK Systems KD485 ADE Multidrop nodes to interconnect up to six at the same bus The KD485 ADE is connected to one of the PRV terminal ports The KD485 ADE s are interconnected using 2 twisted pairs 4 wires The PC is connected to the RS 485 422 bus using a RS 232 485 converter of standard type This method is hereafter named Multidrop 3 Using TCP IP terminal servers that supports raw TCP ports This method is hereafter named TCP IP This communication methods may be mixed until the maximum number of PRVs are connected The DDE Server is a general purpose DDE Server it may be used by any Microsoft Windows program which is capable of acting as a DDE Client Examples of such programs are Microsoft Excel Intellution FIX CiT Citect and Wonderware InTouch The PRV DDE I O Server requires Microsoft Windows version 95 98 NT 4 0 2000 or XP and depending of configuration a standard RS 232 serial port appropriate converters and multidrop nodes or WinSock 2 requires an upgrade for Windows 95 which is downloadable from Microsoft Web and a terminal server Se
6. The configuration for this mode is set as follows Mode 2 Configuration 85485 Options Address Lead in byte Timeout period ms 7 The address corresponds to the desired device number This address will be connected to the topic defined for this device The address lies between 1 126 It is not necessary to have the same address as the device it is connected to but it will be much easier to remember I e PRV 027 should have address 27 etc not 1 etc The lead in byte should always be set to 127 which is an illegal character in the byte data stream to the device The timeout period should be set to some proper value 20 ms will do in most cases Remember these values as they have to be set up in the topic definition in the I O Server Save the settings in the KD485 ADE by selecting All KD485 ADE switches should be set in their off position 6 2 2 Timeslots Simply described the communication is done as follows e The PRV DDE I O Server sends out a lead in character immediate followed by a address byte In the same packet a message to the desired device is appended e The PRV DDE I O Server switches to listen mode A pause is made until all characters are sent The desired KD485 ADE will turn on its port 2 transmitter and send out all bytes in its internal buffer This buffer can reside about 2 kB It will simulaneously send the message it got from the DDE I O Server on port
7. or 030 HW P etc then the point is treated as polled If this parameter is set to 0 and no suffix character is used in the Item i e 030 HW not 030 HW E or 030 HW P etc then the point is treated as event based TroSoft PRV DDE I O Server Installation and User Manual 19 The only parameters that are affected by this are ESTA ERSTA HW ST SB ZW ML and MW other Items parameter types are always polled Default 1 6 4 2 PreventWriteOfSameValue If this parameter is set to 1 and the DDE client tries to write an Item that already holds the same value that is written then the I O Server will simply ignore the write The default is that all writes actually are written to the device no matter of its previous value Some system that uses linked blocks or some kind of script to transfer values between different devices may cause excessive writes to occur By setting this parameter to 1 it will be prohibited Default 0 6 4 3 ProtocolTimer The frequency at which the I O Server checks for work to do This timer creates the time slots for multidrop communication which means that if the mode 2 timeout for the KD485 ADE is 20 ms the I O Server will wait for at least 30 50 extra milliseconds before the time slot is ended The default rate of 50 ms will do well for most applications If this value is set to low there will be a excessive system overhead just doing nothing Default 50 ms 6 4 4 RequestTimer The i
8. 22 Default 0 6 4 22 StartupDelay Set the number of msecs the DDE I O Server will wait before it tries to read the sentinel This is valuable if running XP or as a service using SrvAny or started by a shortcut in the startup folder where the sentinel driver may not have startup yet Digi Portservers may also be slow when creating the virtual COM ports Default 0 TroSoft PRV DDE I O Server Installation and User Manual 23 7 Configuration of the PRV The PRV could be set up using the Hyperterminal This should be done of a person with knowledge of the PRV Connect the directly to COM port and set up the Hyperterminal parameters to the desired settings i e correct COM port Direct COM etc baud rate no flow control etc 7 1 Baud rate settings In the PRV at least the baud rate should be set EKL X 1200 bps PRV 2400 bps PRV2 4800 bps The above baud rates may need to be adjusted downwards depending of the load In many cases the baud rates could be adjusted upwards for the PRV2 Use the command TTY2 BD and the device will respond with the actual baud rate Use TTY2 BD 4800 INITTY2 etc for setting the baud rate in the device 7 2 Special considerations for PRV2 Don t use the front port TTY3 though it is not buffered and will have to be set to a very low baudrate 7 3 Event update method If the the event update method see PRV DDE I O Server Item Naming is to be used the following prog
9. DDE I O Server is always shown as an icon in the notify area and could easily be shown again by simply clicking that icon When an event is encountered it will change the color of the icon for a short moment TroSoft DDE I O Server Installation and User Manual 26 8 2 Main window By default the statistics are not shown in the main window Select it to be shown in the systems menu gt DDE 1 0 Server Biel Help Single Connected PRY Port COM1 Statisticured Active Items 000021 Write Requests 000000 Received Bad Packets 000000 Requests sec 000000 Received Bad Number Packets 000000 TimeSlots MultiDrop 000000 Received Bad Data Packets 000000 Received Bad Line Data 000000 Transmission Retries 000000 Packet Response Time 005016 Received Ok Packets 000008 Events TSK252 253 000016 Transmitted Packets 000009 Allocated Items 000021 009e 051 5 018e 063 ESTA 2 00 010e 052 HW 32 019e 063 HW 453 47 Olle 053 020 vip20 hw 9990 00 012e 060 5 2 00 013e 060 H W 369 022 014e 061 ESTA 015e 061 HW 016e 062 5 017e 062 HW In the above example the Topic DUC1 is shown The list below views all Items that are connected to an client or Items that are event based and are persistant Polled Items are indicated using a p following the Item number and event based Items are indicated using an e following the Item n
10. client or server program terminate the link or the conversation They are a very efficient means of exchanging data because once the link has been established no communication occurs until the specified data value changes This makes it possible to show real time data in almost any Microsoft Windows application 2 22 Application Topic and The DDE protocol identifies an element of data by using a three part address The three parts of a DDE address are Application Topic and Item 2 21 Application Application refers to the name of the Windows program server which knows how to access the data element In the case of data coming from or going to a PRV the application portion of the DDE address is 2 2 2 Topic Topic is an application specific sub group of data elements The user creates meaningful names for the PRVs and uses these names as the topic names for DDE references 2 2 3 Item Item indicates a specific item within the specified topic With the PRV DDE I O Server an item is an individual pointparameter in a PRV Note In some cases the term point is used interchangeable with the term item TroSoft PRV DDE I O Server Installation and User Manual 8 3 Installation 3 1 Before you start Before you continue make a complete copy of your DDE I O Server distribution diskette and store the original diskette away in a safe place 3 2 How to install Copy the files in the DDE I O Server to a si
11. e the value is asked for once first time poll and then it relies to the Alarm and Event task to send updates Only points in the PRV using any of the HW ESTA ERSTA MW ST ML SB or ZW parameters could be event based All others will always be polled ignoring any added E or _EF suffix although it could be set static check below Event based Items are read from the PRV during these conditions item has never been asked for anytime first time poll If the RemeberEventltems parameter is set in PRV INI the items will be first time polled immediately when the DDE I O Server is started thus available when a client is asking for it e item is written e The sends and update from the Alarms or Event task e The RefreshTimer and its added random content of RefreshSpan expires During these updates the Item is responding to new client requests with the last known value which is still considered valid e The Transparent mode is exited when the PR VView program releases the Topic 10 3 1 Response time to client requests If the Item is available and valid in memory it is returned when the Topic state machine returns to its idle state i e defaults to 50 ms If a first time poll must be done the Item has never been asked for before it will use as much time as the polled Item does altough next time a client requests the Item it will be in memory 10 4 Static Items To force a point t
12. these changes to become valid 7 31 First time polls When a new Item is requested the PRV DDE I O Server will poll it the first time and then it will only wait for it to be updated automatically by the device TSK252 and 5 253 7 3 2 Refresh of event based Items All event based Items will be refreshed new poll is made in two cases e The Event Refresh Timer has expired If a event is lost by some reason the cable is unplugged for a short moment etc it will be lost for all time To avoid this problems event based Items are polled with a very slow frequency refresh The default is about 30 minutes e The Transparent Mode is exited If the Time Switch Setup program is used it will cause the event based Items to be refreshed when it disconnects from a Topic The reason for this is that an event may be sent by the device during the transparent session and it will then be lost 7 3 3 Persistant Items If set in the INI file RememberEventItems 1 the event based Items will be remembered when the PRV DDE I O Server is shut down i e written to file When the server is started next time it will immediately read these Items and allocate memory for them Next the server will do a first time poll and then treat them as normal event based Items This will result in that when an Item is requested i e new Picture is selected the value will be in memory and returned immediately TroSoft PRV DDE I O Server Installation and User Manu
13. 2 to port 1 where the PRV is connected This data is also buffered and the software flow control between the node and the PRV will become active if neccessary pause is made for the KD485 ADE Mode 2 timeout to expire If the KD485 ADE still has data to send the DDE I O Server listens until it has been quiet for at least one KD485 ADE Mode 2 timeout period This indicates that the KD485 ADE has shut off its port 2 transmitter e The PRV DDE I O Server repeats this sequence until all devices on that network has been polled then it restarts with the first node This sequence for a node is called Time Slot TroSoft DDE I O Server Installation and User Manual 18 6 3 Configuration of the PRV DDE I O Server TCP IP method 3 In the Ports section in the PRV INI a row has to be entered that describes the port setup and the Topics associated with that port Though it is a multidrop connected PRV there could be more than one Topic associated The row should have the following format TCPta t x where ta Address 192 168 123 50 10001 or duc4 automatisera nu 10001 etc t Topic DUC1 DUCI etc max 8 characters x Idle timeout 300 300 ms etc delay from answer to next request example TCP 192 168 123 50 23 DUC4 300 Means that it is a TCP connection to 192 168 123 50 at port 23 The Topic is DUC4 and the time the PRV DDE I O Server waits from an answer until next request is 300 ms 6 3 1 Configuration of the Term
14. DE address byte This is used to signal address packet start in multidrop environments This must be the same as Mode 2 Configuration the Lead In Byte in the KD485 ADE setup Default 127 6 4 14 DisableNagleAlgorithm If set to 1 it will cause the driver to send TCP packets immediately instead of waiting for more data to be put in the output buffer This will increase communication speed The driver automatically concatenates output data into a single frame which means that this parameter always should be turned on Default 1 TroSoft PRV DDE I O Server Installation and User Manual 21 6 4 15 ForceUpdatelInterval If set to anything else than 0 it will cause the server to issue a DbNewValueFromDevice i e sending an advise loop update with this millisecond interval for all valid points even if they are unchanged Some DDE Clients does not notify updates properly and may need this parameter to be set This will not affect physical communication speed or DCS load but it will increase the PC CPU load if set to a very small value Default 0 6 4 16 ManuallyStripNulls If set to 1 it will cause the PRV driver to disable the fNull flag in the CommDCB and manually strip NULLS from the incoming data stream This prevents problem when Digi s RealPort software is used though there is a problem with the Digi driver Default 1 6 4 17 ERSTAAIwaysDigital If set to 1 it will cause the driver to send all ESTA and ERSTA values
15. NFRINGEMENT NEITHER TroSoft AB NOR ITS SUPPLIERS SHALL BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT INDIRECT LOST PROFITS OR INFORMATION BUSINESS INTERRUPTION OR OTHER PECUNIARY LOSS EVEN IF TroSoft AB HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN STATES WHO DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES THE LIABILITY IS MAXIMIZED TO THE PURCHASE PRICE OF THE SOFTWARE The SOFTWARE and documentation are provided with RESTRICTED RIGHTS Use duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 or subparagraphs c 1 and 2 of the Commercial Computer Software Restricted Rights at 48 CFR 52 227 19 as applicable Manufacturer is TroSoft AB Box 2055 S 144 03 RONNINGE SWEDEN TroSoft PRV DDE I O Server Installation and User Manual 1 About the PRV DDE I O Server The DDE I O Server is a Microsoft Windows application program which acts as a DDE Dynamic Data Exchange Server and allows other Windows application programs access to data in the Siemens Landis amp Staefa PRV line of building automation devices In the text that follows we will be using the term PRV to represent a Siemens Landis amp Staefa line of building automation device i e and PRV2 The old EKL X device is also supported The
16. PROGRAM seesserersesesesecceroroesesesecoesoee 30 9 1 USING THE PRV DDE I O SERVER WITH MICROSOFT 30 9 1 1 Reading Values into Excel Spreadsheets 220000000 30 9 1 2 Writing Values to PRV device 2 30 10 DDE I O SERVER ITEM NAMING sssesesessesorsesesecceserosoeseseccerosorsesececoesororsesecocoesosoeseseesee 31 102 ITEM NAMING EXAMPLES 31 10 2 POLLED ITEMS T E E EA EEEE ES 31 TroSoft PRV DDE I O Server Installation and User Manual 4 10 2 1 time to Client 15 cesccessccescessceceseceescecesecesacecsceesaceceeceeeaceceeeeeeaceceeeeeeaeees 31 10 3 EVENT BASED TEMS 5 32 10 3 1 Response time to Client requests cescccsscesesceesseceseceescecesecesscecesceesacecseceeeaceceeeeeaaeceeeeeeaeees 32 104 lt 5 5 a 32 10 4 1 time to Client 15 seinen nnn a a a a 33 10 5 DEFAULT ITEM TYPE oii 33 10 6 RESERVED ITEM NAMES 33 as RS BA A 33 10 6 2
17. PRV DDE I O Server for use with Siemens Landis amp Staefa PRV building automation devices User and installation manual About PR PRY Revision history Version Date Author Reason Preliminary June 1999 Tomas Rook First release Release September 1999 Tomas Rook Revision 1 00 00 0 May 2000 Tomas Rook Event based persistant cache 1 00 00 6 November 2000 Tomas Rook New parameters 1 00 00 20 April 2005 Tomas Rook Setup revision 1 00 00 22 October 2005 Tomas Rook New parameters 1 00 00 25 March 2007 Tomas Rook New parameters TroSoft PRV DDE I O Server Installation and User Manual 1 ABOUT THE PRV DDE 2 2 2 1 2211 7 27 DDE 55 8 2 1 CLIENTAND SERVER 8 2 2 APPLICATION TOPICAND ITEM reunian nr ar a aari ENES 8 2 2 1 Appheatiot aha aR a TON ae Dudas RRO 8 2 2 2 CCRT ERC 8 2 2 3 ies E eh te Ba Re RR 8 INSTALLATION sscsscssssdesenasvassesseccsadussnossessoncnsonsonossosaccsnaseoonessdsnonceSenssnonseasscenasussnosseusoncedosnssadsoaseonses 9 3 1 5
18. RATION OF THE 0 ccccsscsscsscsscsscescessnessssnsscesscssessessnessesnessessesssessssnessesneses 24 74 SETTINGS 24 7 2 SPECIAL CONSIDERATIONS FOR 2 24 7 3 shee canoer E 24 7 3 1 First ame polls ra a te test SA lasik Bela 25 7 3 2 Refresh of event based 25 7 3 3 sak cea ieee han case eee ee gs te ga 25 8 RUNNING THE DDE I O SERVER 26 8 1 26 622 ENTE ENER 27 8 3 2 A E EEO E o EE EEEN E EEEE EEES 27 8 3 1 Statistic performante isasi tnia aa 28 6 45 HELP MENU i Ae ee As E E E I a inte SRS ETS 28 8 5 ST T T 29 8 5 1 Refresh event based tens enred aeoea eree ene a 29 8 5 2 Clear event based 29 8 5 3 R SE E I ECE EE EEEE EEE EEEE 29 9 USING THE DDE SERVER FROM DDE CLIENT
19. a 20 6 4 6 20 6 4 7 doce shes see 20 6 4 8 21 6 4 9 21 6 4 10 ShowSend ShowReceive ShowErrors ShowEvents ShowStatistics 21 6 411 KeepUSsedPortsOpeny icccccccciccssscasicisscsincisssisessegstasehastasasiecbsntsnesisassapeveesinsiaseadeosersteosisescee 21 6 4 12 tem cccccccccccceesceesceeceseeseeucecaceeseeeseesceeecensceeseceseeeseceaeeaecsaeceeeeeeaeennees 21 6 413 AddressByt 21 6 4 14 DisableNagleAl gorithm i 21 642 at As ES 22 6 416 22 6 4 17 22 6 418 22 7 CONFIGU
20. al 25 8 Running the PRV DDE I O Server 8 1 Startup When the PRV DDE I O Server i started it will first of all try to find the hardware key in the parallell port If it is not found it will show this message PRY DDE 1 0 Server Sentinel key not found Insert key now and proceed with Retry or press Ignore to run in demo mode F rs k igen Ignorera Abort Shut down the program Retry Scan the parallell ports once again Ignore Ignore the missing hardware lock and run in demo mode When the PRV DDE I O Server has started it will show some info box above the main window After a few seconds this box will be automatically unloaded it may also be unloaded by pressing the Ok button This PRY Single Multidrop DDE 1 0 Server was developed with the Wonderware DDE Server Toolkit All Rights Reserved Copyright 1993 1995 Wonderware Corporation During startup the DDE I O Server will scan through the file and create the Topics that are defined If the Topic license limit is exceeded the extra Topics will not be created and therefore rejected when they are requested If the DDE I O Server should remember RememberEventItems 1 any event based Items it will read them at the time the Topics are created and start the first poll If the StartupHideTimer parameter is set to anything else than zero it will cause the main window to be hidden when that time has expired The PRV
21. and User Manual 34 12 Time Switch Program TSP Though the PRVs has a rather complex structure of the time switch programs which also differs between PRV1 PRV2 there is a external program PRVView supplied with the DDE I O Server to provide access to the different TSPs The supported TSPs are EKL X PRV1 WDC SDC OVC PRV2 DST gt WDC SDC OVC PRVView accesses the PRV DDE I O Server through the reserved item name TRANSPARENT and will request explicit communication to the desired device thus shutting down any updates for that device during the TSP up download phase Read the PRV View documentation for installation and user info TroSoft PRV DDE I O Server Installation and User Manual 35 13 Performance 13 1 Different link types 13 11 Hot Link Advise Loop DDE Advise The client program must create an advise loop i e use a hot link style when the DDE items are accessed because the PRV DDE I O Server has an internal cache and sorts all items before any request is sent to the PRV About five values are requested at a time If a hot link is used the Server will automatically update the client when the value changes thus minimize the amount of DDE messages sent internally or through NetDDE 13 1 2 Cold Link DDE Peek If a cold link is used and an item is peeked this will cause the PRV DDE I O Server to create a cached structure for this item request it from the PRV and send the answer back to the clien
22. aults to 10 minutes 10 x 60 x 1000 ms Default 600000 ms 6 48 The time the server waits before it tries to reconnect a broken TCP connection Default 120000 ms 6 4 9 StartupHideTimer Hides the main window within this time from startup If set to 0 it will never be hidden The PRV DDE I O Server always is shown in the notify area at the desktop 6 4 10 ShowSend ShowReceive ShowErrors ShowEvents ShowStatistics These settings indicate which system menu items should be checked at startup Default ShowErrors defaults to 1 all others to 0 6 4 11 KeepUsedPortsOpen If set to and a port once is opened Topic requested it will be kept open thus updating event based points This will cause any opened ports to never be closed until the PRV DDE I O Server is shut down Default 1 6 4 12 RememberEventItems If set to 1 the server will save all allocated event items at shutdown When the server is restarted it will immediately reallocate these items and ask for them do a firstpoll then normal event handling is updating the items This means that these items already are in the item list and updated when the client asks for them The parameter Keep UsedPortsOpen have to be set for this to work The event based Items are saved in a file named topic DAT i e DUCI DAT etc The file will be located in the same directory as the DDE I O Server itself Default 0 6 4 13 AddressByte The KD485 A
23. bjects to change but for now they contain Statistics 0 Active Items advise loops Statistics 1 Bad packets Statistics 2 Bad packet numbers returned Statistics 3 Bad packet data in data field Statistics 4 Retries made Statistics 5 Ok packets received Statistics 6 Packets semt Statistics 7 Sent write requests Statistics 8 Handled requests per second Statistics 9 TimeSlots sent Statistics 10 Bad Line Data parity overrun etc Statistics 11 Packets reponse time ms Statistics 12 Allocated Items advise loops including not used event based items 10 6 3 Transparent When the Transparent item is accessed for a topic i e an advise loop is created all other item update for that topic will be shut off and a direct connection to the topic is made All characters that is poked to Transparent is sent directly to the PRV and all characters that is received is immediately transferred to the Transparent client This item is only intended for use with the PRV View program TroSoft PRV DDE I O Server Installation and User Manual 33 11 WWLogger This logging program provides a way to log information from servers written using the WonderWare DDE Server Toolkit It can log to window or to disk All data that is sent to and received from the devices may be logged By default any errors are logged to WWLogger The WWLogger should be shut down if not needed for debugging purposes TroSoft PRV DDE I O Server Installation
24. d polled by DDE I O Server Between the polls the KD485 ADE place its RS 485 transmitter in a high impedance mode The KD485 ADE internally uses a weak pull up at the bus to ensure proper signal level Be assured to terminate this bus in both ends Read the KD485 ADE documentation for detailed descriptions be extra careful reading the chapter that describes the signal ground connection issue If more than the RS 485 422 specified cable length about 1200 m at 9600 bps with AWG24 is needed a RS 485 422 repeater is needed The repeater must work at hardware signal level and cause no delay on the line TroSoft PRV DDE I O Server Installation and User Manual 11 The KD485 ADE multidrop nodes are available from KK Systems in U K Check http www kksystems com for pricing and local distributor information Power supply needs to give 12VDC 200mA Startup current 500mA 4 3 Hardware requirements TCP IP method 3 If TCP IP communications are to be used a network card with appropriate settings in Windows for TCP IP is required Further a terminal server is required The Net Controller available from WHI konsult http www whi se has been tested successfully with the I O Server but any terminal server that can be set up with raw TCP ports will do TCP IP LJ Ethernet Ethernet Terminal Server There are also several models that use TCP IP as transport media but emulates COM ports in Windows i e Digis Et
25. e PRV is made of the TX RX and GND signals properly connected as EKL X PRV to PC or PC DSUB 25M DSUB 9F DSUB 25F 2 2 3 3 3 2 T 5 7 PRV2 to PC or PC DSUB 25F DSUB 9F DSUB 25F 2 2 3 3 3 2 5 7 If more than the specified RS 232 cable length about 15 m is needed short range modems should be used TroSoft PRV DDE I O Server Installation and User Manual 10 4 2 Hardware requirements Multidrop method 2 One KD485 ADE multidrop node per PRV and one standard RS 232 422 converter RS 232 port per multidrop network is required COMx RS 485 422 Converter TX 5 232 RS 232 422 converter should be of a standard type i e RAD 232 etc See the converters documentation for connection instructions The communication speed at the KD485 ADE network should be higher 9 6 38 4 kbps than the speed to the PRV 1 2 9 6 kbps KD485 ADE supports speed conversion and also holds 2 kB buffer of data No hardware flow control is used by the DDE I O Server which means that any features as RTS transmission control should be turned off The PC is transmitting data using a RS 422 fashion i e the converters RS 422 transmitter should always be turned on to specify an appropriate signal level on the bus The KD485 ADE multidrop nodes transmit data when the are addresse
26. e below Hardware Requirements for a detailed description The DDE I O Server is written in using WonderWare DDE Server Toolkit which guarantees a stable and fast platform for interprocess DDE communications and compliance to the FastDDE interface TroSoft PRV DDE I O Server Installation and User Manual 2 What is DDE DDE stands for Dynamic Data Exchange DDE is a complete communication protocol designed by Microsoft to allow applications in the Windows environment to exchange data with each other It implements a client server relationship between two concurrent running applications 2 1 Client and Server The server application provides the data and accepts requests from any other application interested in its data Requesting applications are called clients Some application can simultaneously be both a client and server To obtain data from another application the client program opens a channel to the server application by specifying three things the service name the topic name and the specific item name For example in the case of Excel the service name is Excel the topic name is the name of the specific spreadsheet that contains the data and the item name is the specific cell on the spreadsheet When a client application sets up a link to another DDE program it requests the server application to advise the client whenever a specific item s value changes These data links will remain active until either the
27. er Installation and User Manual 32 10 41 Response time to client requests If the Item is available and valid in memory it is returned when the Topic state machine returns to its idle state i e defaults to 50 ms If a first time poll must be done the Item has never been asked for before it will use as much time as the polled Item does altough next time a client requests the Item it will be in memory 10 5 Default type If no suffix E _E P _P S or _S is added to the Item it will by default become of the type indicated by the DefaultPolled parameter If DefaultPolled is set to 0 then all Items with the PRV parameter type HW ESTA ERSTA MW ST ML SB or ZW will be event based All others are polled If DefaultPolled is set to then all Items will be polled 10 6 Reserved Names Some names are used internally by the PRV DDE I O Server to provide information for the user about the different topics 10 6 1 Status Returns the connection status information about the topic This is a discrete and it is set to 1 if the connection is ok and 0 if there is some connection failure 10 6 2 Statistics nn Returns the statistic information about the topic The returned information is a long integer and contains the same information that the PRV DDE I O Server shows in the main window This item may also be written i e to clear this information The statistics are su
28. hat normally won t be able to update using the Event or Alarm task such as LOL HIL to be static it should be suffixed using S 57 This will cause DDE I O Server to only read the Item once first poll just like any event based Item It will also further on be treated as a normal event based Item although it will never be updated by the PRV This type of static Item is very useful when a parameter that is fairly static should be read This Item will be updated when it is written or refreshed by the PRV DDE I O Server for some reason and also refreshed as event based Items This Item type should be used if the parameter is never updated by any task in the PRV though it will significally decrease the response time when the Item is requested from a client Event based Items are read from the PRV during these conditions item has never been asked for anytime first time poll If the RemeberEventltems parameter is set in the items will be first time polled immediately when the DDE I O Server is started thus available when a client is asking for it The item is written e The RefreshTimer and its added random content of RefreshSpan expires During these updates the Item is responding to new client requests with the last known value which is still considered valid e The Transparent mode is exited when the PRV View program releases the Topic TroSoft PRV DDE I O Serv
29. herLite etc These may also be used but should and could not be set up as TCP IP connected devices TroSoft DDE I O Server Installation and User Manual 12 4 4 Hardware requirements for the PRV A free terminal port If communicating with a PRV2 don t use the front port TTY3 though it has poor performance 4 5 Hardware key requirement To be able to run the DDE I O Server in normal mode not demo a hardware key i e dongle needs to be installed It is simply plugged into the parallell port of the PC Any printer is connected directly after the hardware key The hardware key is of the type Rainbow Sentinel SuperPro which is very short Sometimes there is a need for a driver for this hardware key to be installed The driver is supported on the setup diskette simply run the SETUP EXE in the Sentinel directory There will not be any message if the installation has succeded and in most cases the PC does not need to be restarted Check http www pericosecurity com for updates 4 51 Other licensing methods The hardware dongle is also available as an USB dongle If the hardware dongle does not fit ex running on a server without parallell or enough USB ports a registration code based upon the system id is available from TroSoft The system id is shown in the About box 4 5 2 License add ons An existing license may be upgraded in two ways e Purchase a new hardware key and add it behind the other ke
30. inal Server TCP IP The terminal server is usually set up using a directly connected serial cable or a Telnet session See the terminal servers documentation for detailed description Set the terminal servers serial port to use the XOn Xoff protocol The port must be associated to a socket port number For a Net Controller this is by default set to 10001 port 1 and 10002 port 2 The port must be set up as a raw tcp port TCPPORT etc Any byte stream changing port protocol must be disabling including login Telnet etc Set the timeout Nagle algorithm to a low value though it is small packets sent to the DDE I O Server For 9600 bps about 15 ms should be appropriate If the terminal servers IP address is to be associated with a domain name the WAN LAN Internet DNS must be set up with the terminal servers IP address It is also possible to associate the domain name in the local HOSTS file located in the Windows directory WINNT or WINDOWS Check that the PC has a connection to the terminal server by pinging it PING 192 168 123 97 or PING duc4 automatisera nu etc 6 4 Other settings The file holds some other useful settings in the General section The default setting indicates what is set internally in the PRV DDE I O Server if the parameter is not entered PRV_INI file 6 4 1 DefaultPolled If this parameter is set to 1 and no suffix character is used in the Item i e 030 HW not 030 HW E
31. ll event based Items The RefreshTimer will also be reset for all event based Items This requires a Topic to be selected in the Topics list which in turn requires the statistics to be turned on 8 5 2 Clear event based Items Event based Items that are hold by the PRV DDE I O Server but does not actually have an connected client will be removed This requires a Topic to be selected in the Topics list which in turn requires the statistics to be turned on 8 5 3 Exit Shuts down the PRV DDE I O Server TroSoft PRV DDE I O Server Installation and User Manual 29 9 Using the DDE Server from a DDE Client program 9 1 Using the PRV DDE I O Server with Microsoft Excel Data from PRV topics may be accessed from Excel spreadsheets To do so enter a formula like the following into a cell on the spreadsheet PRV topic item In some cases Excel requires the topic and or item points to be surrounded by apostrophes In the formula topic must be replaced with one of the valid topic names defined during the Server configuration process Replace item with one of the valid item point names described in the Item Naming section 9 1 1 Reading Values into Excel Spreadsheets Values may be read directly into Excel spreadsheets by entering a DDE formatted formula into cell as shown in the following examples PRVi 12 000 PRV DUC43 040_DELOI 9 1 2 Writing Values to device points Value
32. mes timeouts are in ms 6 1 Configuration of the PRV DDE I O Server Direct method 1 In the Ports section in the PRV INI a row has to be entered that describes the port setup and the Topic associated with that port Though it is a directly connected PRV there must be only one Topic associated The row should have the following format COMp 0 b d s f r t x where p Port 1 1 2 2 b BaudRate as is i e 9600 9600 etc d Databits 7 7 8 8 s Stopbits 0 1 1 1 5 2 2 f Flowcontrol 0 None 1 Hardware 2 Xon Xoff r Parity 0 None Odd 2 Even 3 Mark 4 Space t Topic DUC1 DUCI etc max 8 characters x Idle timeout 300 300 ms etc delay from answer to next request example COM1 0 1200 8 0 2 0 DUCI 500 Means that it is a direct connection to COM1 using 1200 bps 8 databits 1 stop bit Xon Xoff as flowcontrol and No Parity The Topic is DUCI and the time the DDE I O Server waits from an answer until next request is 500 ms This pause is necessary for slow devices early PRV1 and EKL X to give them time to do normal processing but may be lowered to about 100 ms for fast devices PRV2 that is unloaded 6 2 Configuration of the PRV DDE I O Server Multidrop method 2 In the Ports section in the PRV INI a row has to be entered that describes the port setup and the Topics associated with that port Though it is a multidrop connected PRV there could be more than one Topic a
33. milar folder on the hard disk If you intend to use the Time Switch Setup Program PRVView which is used to change Time Switch Catalogues in the PRV it must be setup separately 3 2 1 Setup of INI file If you have a serial port connected to a PRV the server is now almost ready for action Only a small amount of configuration changes is needed to complete the installation 3 2 2 Licensing If you have a hardware key read the PC Hardware key requirement section for information about sentinel driver installation 3 2 3 Files in the DDE I O Server installation directory The following files are located in the PRV DDE I O Server folder normally C Program Files PRV PRV EXE The PRV DDE I O Server itself PRV INI The INI file containing Topic and Port definitions PRV XLS An example excel sheet WWLOGGER EXE WonderWare Logger program WWLOGSVC EXE WWLogger help module WWCOMDLG DLL WonderWare Common Dialog Controls RPCRT4 DLL WWLogger help module COMMONUI DLL WWLogger help module LMGR325A DLL WWLogger help module WWCOMMON DLL WWLogger help module TroSoft PRV DDE I O Server Installation and User Manual 4 Hardware requirements For enabling the communication link there are some hardware requirements 4 1 Hardware requirements Direct method 1 The PC computer needs to be equipped with at least one standard RS 232 serial port gt y RS 232 gt RX 4 GND 4 1 1 Cabling The cabling to th
34. n of the KD485 ADE Multidrop node The KD485 ADE nodes has to be set up using a direct connected PC Install the KDCFG program for Windows This program is shipped along with the KD485 ADE multidrop nodes Shortly explained a node setup is made as follows Connect the cable between the KD485 ADE port 1 and the PC COM Connect power to the KD485 ADE port as described in the manual and set the node in executive mode Start the KDCFG program For detailed description consult the KD485 ADE manual Set the following parameters in the KD485 ADE KD485 Configuration File Port Sur Help Port 1 RS232 Port 2 RS422 485 ADE Fixed Program Baud rate as00 Baud rate Mode Bitsjword 8 z Configure Parity Parity PROG User Program Stopbits 1 Stopbits 1 x Hy Upload Yalid Program TX Xon xoff TX Xon xoff T Update KD485 PC Port COM1 Product Type ADE Version v1 03 Serial number 15991 The baudrate for port 1 should be set to the same speed the PRV will be set to The KD485 ADE network that resides on port 2 should be set to the same speed as the COM port will be set TroSoft PRV DDE I O Server Installation and User Manual 17 to in the PC Observere that the parity at port 2 should be set to even This is for increased data integrity The nodes Fixed Program must be set to work in Mode 2 addressable multidrop node
35. nterval the DDE functions will check for any request timeouts ValidDataTimeout This could be set up to a couple of seconds Default 500 ms 6 4 5 ValidDataTimeout The amount of time the DDE protocol will wait for a value from a device before an NACK will be sent to the client If the device is busy this timer may expire and send a NACK to the client Default 20000 ms 6 4 6 RefreshTimer The interval within the event based items should updated defaults to 30 minutes 30 x 60 x 1000 ms All event based items are polled immediately they are requested for the first time When the first poll is made it relies to that the device sends any updates for that point If for some reason any update is lost i e the cable is unplugged a short moment when an update is sent etc it will never change state unless it is periodically updated just like polled points Therefore event based points are polled but with a very long interval This defaults to 30 minutes 30 x 60 x 1000 ms The shortest interval that could be set is one minute 60000 ms Default 1800000 ms 6 47 RefreshSpan The span the server uses to spread refresh requests This will smooth communication during refreshs though any new event based Items get a refresh time that is the sum of the TroSoft PRV DDE I O Server Installation and User Manual 20 RefreshTimer time and a random portion of the RefreshSpan time i e by default spans from 30 40 minutes This def
36. ram rows has to be entered in the Alarm and the Event task TSK252 TSK253 Use of the event update method is strongly recommended though it will significally decrease the response time for these Items In the Alarm task the following lines should be entered in the appropriate place TSK252 1020 PA PRIADR 1050 PRINT lt PA ADR PA HW PA ERSTA In the Event task the following lines should be entered in the appropriate place TSK253 1020 EA EVADR 1050 PRINT lt EA ADR EA HW EA ERSTA TroSoft PRV DDE I O Server Installation and User Manual 24 The ERSTA parameter should be exchanged to EST if a PRV EKL X is used Furthermore all points that are used as event points should have the EVE parameter set to 1 Alarm points should have the PRIO parameter set to more than 0 otherwise they will not cause an alarm event The difference of TSK252 and TSK253 is that TSK252 is started each time the point is changing its alarm state if PRIO gt 0 i e all delays have expired In the power on task TSK254 the following rows should be entered in the appropriate place 1030 252118 2 1040 252 TSKPRP 2 1030 253 TSKTTY 2 1040 253 TSKPRP 2 This will set the Task Prompt to not be shown when the event happens but not degrade performance of the event alarm task The TSKTTY statement should point to the port where the PRV DDE I O Server is connected Remember to restart the device or just simply run the TSK254 for
37. s may be written to the PRV DDE I O Server by creating an Excel macro which uses the DDE POKE Command The command is entered in Excel as follows INITIATE PRV Topic Name POKE Channel_Id Ttem Data_Reference RETURN For Channel_Id use the cell reference where the INITIATE statement is found For Data_Reference use the cell identification which contains the POKE value Some applications have a limited number of channels therefore they should be closed when finished by using a TERMINATE statement in the macro The TERMINATE macro should have sufficient delay to ensure that the POKE has been executed Refer to the Excel Manual for further details TroSoft PRV DDE I O Server Installation and User Manual 30 10 PRV DDE I O Server Item Naming The DDE I O Server accepts item names with syntax that are as much as possible consistent with Siemens Landis amp Staefa point naming conventions Because some DDE clients are inconsistent and incomplete in their DDE specification the I O Server will accept names that look different and internally adjust them Most point types can be read and written while some can only be read All physical points and their parameters in a PRV are accesable through the PRV DDE I O Server Though there are several parameters please consult the PRV reference litterature to get a complete list Supported access modes are indicated in the table 10 1 naming examples
38. ssociated The row should have the following format COMp 1 b d s f r t x ka kt t x ka kt t x ka Kt where Port 1 2 COM2 b BaudRate as is i e 9600 9600 etc d Databits 7 7 8 8 s Stopbits 0 1 1 1 5 2 2 f Flowcontrol 0 None 1 Hardware 2 Xon Xoff r Parity 0 None Odd 2 Even 3 Mark 4 Space TroSoft PRV DDE I O Server Installation and User Manual 16 t Topic DUC1 DUCI etc max 8 characters x Idle timeout 300 300 ms etc delay from answer to next request kt Timeslot timeout 20 20 ms etc for KD485 ADE timeout ka Address 12 12 etc address in KD485 ADE example COM2 1 19200 8 0 0 2 DUCZ2 300 12 20 DUC3 300 13 20 Means that it is a multidrop connection using COM2 at 19200 bps 8 databits 1 stop bit no flowcontrol and Even Parity The first Topic is DUC2 and the time DDE I O Server waits from an answer until next request is 300 ms This pause is necessary for slow devices early PRV1 and EKL X to give them time to do normal processing The KD485 ADE address is 12 and it has a timeout time of 20 ms which must correspond to the setting in the Mode 2 Configuration below The second Topic is DUC3 and the time DDE I O Server waits from an answer until next request is 300 ms The KD485 ADE address is 13 and it has a timeout time of 20 ms which must correspond to the setting in the Mode 2 Configuration below 6 2 1 Configuratio
39. t The cached structure will then be deleted This will significally degrade performance though newly created cache structures will get the highest priority in the read queue The only requests that will get higher priority are write requests 13 1 3 Scada system link types Almost all SCADA systems creates advise loops Intellution FIX Wonderware InTouch CiT Citect Even Excel creates an advise loop 13 2 New Items response time A directly connected PRV2 will respond with about 10 new values per second at most if polled A slow EKL X fully loaded will respond with about 2 items per second at most if polled 13 3 Event based Items response time Try to use as many event based points as possible though it will dramatically increase performance The difference is greater the older the device is that is used The average response time for new Items that are event based and valid in memory first poll already made is less that ProtocolTimer defaults to 50 ms if there are no outstanding reuests TroSoft PRV DDE I O Server Installation and User Manual 36
40. tly delete the software from your computer and cease use of the software The TroSoft AB License Agreement Agreement permits you to make an unlimited number of copies of any one or more of the TroSoft AB software products identified the SOFTWARE for your internal use provided that a the SOFTWARE is not modified in any way and b the SOFTWARE is used on only a single COMPUTER at a time c you maintain the copyright notice on all copies of the SOFTWARE The SOFTWARE including any images applets photographs animations video audio music and text incorporated into the SOFTWARE is owned by TroSoft AB or its suppliers and is protected by United States copyright laws and international treaty provisions You may not rent or lease the SOFTWARE but you may transfer the SOFTWARE on a permanent basis provided you retain no copies the recipient agrees to the terms of this Agreement and that TroSoft AB is informed of the transfer You may not reverse engineer decompile or disassemble the SOFTWARE except to the extent the foregoing restriction is expressly prohibited by local law If the SOFTWARE is an update or has been updated any transfer must include the most recent update and all prior versions NO WARRANTIES TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW TroSoft AB DISCLAIMS ALL WARRANTIES EITHER EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NONI
41. to the DDE client as either 0 or 1 The value 0 will be updated as 0 and any value that not is 0 will be updated as 1 instead of its real value Default 0 6 4 18 RegistrationCode If there is no hardware dongle the PRV DDE I O Server may be licensed using a registration code based upon the system id The system id is visible in the About box Default 6 4 19 AlwaysUseCFTEXT Most systems send new values to the DDE I O Server as CF_TEXT In some cases the conversion is made using regional settings digit grouping and decimal symbols which in most cases is a problem for the C code parser to parse correctly If AlwaysUseCFTEXT is set to 1 it will cause the DDE I O Server to do the parsing by itself directly from CF_TEXT This is sometimes a more tolerant conversion Ex Fix32 iFix is writing values using space digit grouping which cause values above 999 to not be written correctly This limits the resolution to 12 digits to the left of the decimal delimiter and 5 digits to the right 123456789012 12345 Default 0 6 4 20 AlwaysUseDecimalComma If Always UseCFTEXT 1 this determines if we should use comma instead of period in float values when converted to CF_TEXT Default 0 6 4 21 RunUnattended If RunUnattended 1 then the DDE I O Server will never use any message boxes which is valuable if the DDE I O Server is to be run as a service using SrvAny TroSoft PRV DDE I O Server Installation and User Manual
42. umber Static points are indicated as event based The address and the last known value which in fact are the actual value are also shown If the value is unknown it is replaced by The lt indicates that that Item is not used altough it is allocated Items are always allocated in blocks of 64 even if they are not used This is done to avoid fragmentation of the memory The statistics above to the right indicate the status of the Topic 8 3 System menu Most of the run time settings are made in the System menu TroSoft DDE I O Server Installation and User Manual 27 PRY DDE 170 Server The above settings self explonatory All Show menu items refer to WWLogger debugging except Show statistics which indicates wheter the statistics should be shown in the main window or not 8 3 1 Statistic performance If the statistics is shown in the main window and a Topic that is connected to a PRV2 using a lot of Items the statistics itself may degrade performance 8 4 Help menu The only choice in this menu is the About info This About info box indocates the license information which indeed is shown also in WWLogger TroSoft DDE I O Server Installation and User Manual 28 8 5 File menu Help Refresh event based Items Clear event based Items Exit 8 5 1 Refresh event based Items Forces the PRV DDE I O Server to refresh the value of a
43. usage Be aware of that any additional application may require more memory i e the SCADA system There should be enough DRAM memory to avoid memory paging to disk usually named swapping though this will degrade performance If logging is made to disk using WWLogger it will consume disk space in a considerable speed about 1 5 kB s if 10 polled devices are logged This is about 5 MB hour 5 2 Limitations Maximum devices per DDE I O server Maximum PC cable length Direct Maximum distance TCP IP routed Maximum PC baudrate Direct Maximum PC baudrate Multidrop Maximum PC baudrate TCP IP The baudrate is always Maximum traffic PRV2 Maximum number of nodes network method 2 Maximum network cable length Multidrop Depending of license 6 recommended max 15m 1200 m without repeater Unlimited 1200 9600 bps 38400 bps n a 1200 9600 bps 55000 events hour unloaded device Direct polled TroSoft PRV DDE I O Server Installation and User Manual 15 6 Configuration All settings to this driver is made up in PRV INI file located in the directory defaults to C Program PRV Future versions of this driver will include a setup program for this file but until then all settings have to be done manually by editing the file using NotePad etc The DDE I O Server always needs to be restarted for any changes in to become valid Please notice that all ti
44. y s The PRV DDE I O Server will scan all keys and add the licenses together before it starts e Return the original key when a new upgraded one is delivered These methods ensure that the PRV DDE I O Server may run continuosly without any interruption until the new Topics should be activated The PRV DDE I O Server then needs to be restarted TroSoft DDE I O Server Installation and User Manual 13 4 5 3 Demo mode If the harware key is missing the PRV DDE I O Server will start in demo mode In this mode it has all funcionality as in normal mode with the following limitations It runs with maximum 10 PRVs e It will automatically shut down within 30 minutes When the demo time has expired the PRV DDE I O Server may be restarted for another period of 30 minutes TroSoft PRV DDE I O Server Installation and User Manual 14 5 Software Requirements At least Windows 95 Windows 98 Windows NT SP3 Windows 2000 or Windows XP If Windows 95 is to be used in conjunction with communication method 3 TCP IP the Winsock 2 update has to be installed This update is available from the Microsoft Web http www microsoft com This upgrade requires DCOM95 to be installed Both upgrades are about 2 MB total 5 1 Resource Requirements Windows 95 98 DRAM Windows NT 4 0 DRAM Hard disk space 16 MB 32 MB 5 MB The PRV DDE I O Server memory requirements for Windows 2000 and XP is about 32 MB beside normal memory
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