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- COMROUTE
- A MODEM SHARING PROGRAM
- FOR NOVELL NETWARE IPX
- NETWORKS
-
- VERSION 1.00
- 11/3/95
-
-
- Copyright c 1995 by R J Crowther
-
-
-
- TRADEMARKS
-
- Netware, Netware Lite, Personal Netware and Novell are
- registered trademarks and IPX is a trademark of Novell, Inc.
- Microsoft and MS-DOS are registered trademarks and Windows
- and Windows for Workgroups are trademarks of Microsoft
- Corporation.
-
- PKUNZIP is a trademark of PKWARE, Inc.
-
-
-
- INTRODUCTION
-
- COMROUTE allows a number of workstations attached to a
- Novell network to share a modem or other serial (RS-232) device
- attached to a COM port.
-
- Network users are used to the concept of sharing resources : that
- is the fundamental reason for networking. Novell networks
- provide sophisticated facilities for sharing storage devices and
- printers, but not for serial devices such as modems.
- The "Novell networks" on which COMROUTE works include all
- those based on the IPX protocol. These include all versions of
- Netware, Netware Lite and Personal Netware.
-
- This version of COMROUTE does not include support for
- NETBIOS networks such as Windows for Workgroups. A future
- version of COMROUTE for NETBIOS may be released if there
- is user demand.
-
- Most network applications involve the concept of one or more
- "clients" or resource users, and "servers" or resource providers.
- COMROUTE is no different, and has two main parts, OFFER
- which is the server and CAPTURE which is the client. Note that
- neither part runs on a Novell 2.x , 3.x or 4.x file server - both are
- DOS programs which run on workstations.
-
- OFFER "takes over" a comms port on the server workstation,
- and allows clients running "CAPTURE" on other workstations to
- connect to it. Each copy of OFFER captures a single comms port,
- and only one client may connect at one time. Both OFFER and
- CAPTURE are Terminate and Stay Resident programs. This
- means that the server workstation (as well as the client) can be
- used as normal while servicing the comms port.
-
- Port configuration such as baud rate, number of data bits and so
- on are automatically handled by the programs.
-
- A utility program "UTIL" allows the user to display configuration
- and statistics, and to unload OFFER or CAPTURE from
- memory.
-
-
-
- INSTALLATION
-
- Installing the software is simply a matter of using PKUNZIP to
- extract the files into your preferred directory. PKUNZIP is not
- included as part of the package, but is available as Shareware.
-
- The COMROUTE software makes no assumptions as to the
- location of the files, and they can be loaded on a file server if
- required.
-
-
-
- SOFTWARE LICENCE
-
- SHAREWARE VERSION
-
- You may install and use this software for 60 days for the purpose
- of evaluating it. If you find the software useful you must register
- it, otherwise you must discontinue using it after this period. You
- are encouraged to copy and share this software, but this
- documentation must be included. The software has specific
- limitations set out below.
-
- Support is not guaranteed for the Shareware version.
- Please support the concept of Shareware by purchasing the
- registered version if you use COMROUTE beyond the evaluation
- period.
-
-
- REGISTERED VERSION
-
- You are licenced to use this software on a single network. Any
- number of clients may access a single modem or serial port,
- however one licence must be purchased for each shared modem
- or serial port operated simultaneously.
-
- Support is available to registered users via post or e-mail. See the
- separate Support section.
-
- Free distribution of this version to third parties is not permitted.
- Please note- the registered software is serial-numbered.
- Licence violations across a single LAN are detected by the
- software.
-
-
-
- SHAREWARE VERSION LIMITATIONS
-
- The shareware version has the following limitations :
-
- 1) The baud rate is limited to 9600. Any higher baud rate
- which is requested will default to a setting of 9600 baud.
-
- 2) The server will cease to operate after 1 hour - it will
- disconnect from any active clients, and refuse further
- connections. The server will also decline to unload,
- meaning that to re-activate it the server will have to be re-
- booted. The normal operation of the server PC will
- otherwise be unaffected.
-
-
- DISCLAIMER
-
- The author does not accept any responsibility for loss or damage,
- direct or consequential, arising from the use of this product, nor
- from the inability to use it for any reason.
-
- In any case, the author's liability will be limited to the sum paid
- for the licence to use the product.
-
- QUICK START
-
- Here is the quick way to get started :
-
- Assuming you have a modem attached to a workstation via a
- serial port connected to COM1: and a fully configured serial
- cable allowing hardware handshaking. The client software will
- emulate COM1.
-
- 1) On the PC with the modem attached (the server) enter
- OFFER -c1 -nModem -fh1
-
- -c1 specifies COM1
- -nModem sets the server name for this port
- -fh1 enables hardware flow control in
- RTS/CTS mode
-
- 2) On the PC which is to be the client enter
- CAPTURE -c1 -nModem
-
- -c1 specifies that COM1 is to be
- emulated
-
- -nModem sets the server to connect to
-
- 3) On the client PC start and configure your comms software
- to use INT14 and (in this case) port 1.
-
- 4) Communicate !
-
-
-
- GENERAL DESCRIPTION
-
- TSR Operation
-
- Both OFFER and CAPTURE programs operate as Terminate
- and Stay Resident (TSR) programs in DOS, each occupying
- about 20K of memory. Once each is loaded, it continues to run
- by processing when DOS is idle, allowing other programs to be
- loaded. The Novell client programs (NETX or VLM) operate in
- the same way.
-
- OFFER "takes over" the specified serial port on the server
- workstation. Incoming data from the port is sent to a client
- workstation running CAPTURE while data from the client is sent
- to the port.
-
- Both OFFER and CAPTURE are Windows compatible.
-
-
- Network Communication
-
- The communications between OFFER and CAPTURE are
- implemented by sending IPX data packets between the
- workstations. These packets contain data as well as control and
- configuration information (such as the baud rate).
- Note that both OFFER and CAPTURE must be on a single
- network segment, that is no network bridges or routers, or file
- servers acting as bridges, may intervene between the
- workstations. A future version may remove this limitation.
-
-
- INT 14 Interface
-
- How it works
- CAPTURE talks to your communications programs via the INT-
- 14 interface. INT-14 is a hang-over from the earlier days of PCs,
- as it is the BIOS interface used to talk to the serial ports. In fact,
- the INT-14 BIOS services proved too slow to be of practical use,
- as they did not use interrupt processing, so most software vendors
- wrote code to directly interface to the serial port hardware. This
- was unfortunate, since the BIOS was supposed to insulate
- programmers from the specifics of the hardware. However, the
- BIOS interface suits our purpose, as INT-14 calls can be
- redirected to a program such as CAPTURE, and this allows the
- "real" serial hardware to be on a different PC altogether.
- Performance is not likely to become a problem, provided the
- network is not overloaded, since Ethernet for example runs at
- least 100 times faster than a PC serial port can.
-
- OFFER uses interrupt-driven serial port handlers to ensure that
- high serial data rates can be accommodated without problems.
- For best performance at higher speeds, 16550 FIFO-buffered
- UARTS are fully supported. In most cases even at 19.2k baud,
- COMROUTE performance will be indistinguishable from direct
- hardware connection.
-
- Of course, your communications software must support the INT-
- 14 BIOS interface to be useable with COMROUTE, but many
- current programs have this option.
-
-
- Int 14 Port Number
-
- When you start CAPTURE, you specify a port number with the
- "-c" option. The communications program you are using needs to
- be configured to use the same port number.
-
- CAPTURE can use any port number between 1 and 9, but not all
- comms software packages do. Since ports 1 to 4 are likely to be
- "real" comms ports on the client PC, it is best to use port
- numbers in the range 5 to 9 provided the comms software
- supports them.
-
- As an example, WinCIM has a "LAN" setting in the Session
- settings window when you select Int14 as the comms port.
-
-
- Using Windows
-
- Both OFFER and CAPTURE are compatible with all versions of
- Windows. In either case, the TSR program must be loaded in
- DOS before Windows is started.
-
- OFFER may suffer performance degradation when some
- Windows programs are run. The performance can often be
- improved by changing the "INT28FILTER=" setting in the
- [STANDARD] section of the SYSTEM.INI file to a lower value
- (the default is 10).
-
- CAPTURE supports Windows programs which are capable of
- using the INT-14 interface.
-
-
- Loading in High Memory
-
- Both CAPTURE and OFFER can be loaded in high memory
- above 640K if your 386 memory manager supports this.
-
- Flow Control
-
- Flow control is the method by which the flow of data between
- serial devices is regulated. This allows devices that can process
- incoming data at different rates to hold up the flow of data until
- they can "catch up". COMROUTE can use four flow control
- modes. Each of the modes is "bi-directional" - OFFER uses flow
- control to prevent its own buffers overflowing and also responds
- to flow control from the connected device.
-
- OFFER and CAPTURE have data buffers of the following sizes
- (not configurable) :
-
- OFFER transmit buffer (data to port) : 1024 bytes
- OFFER receive buffer (data from port) : 1024 bytes
- CAPTURE receive buffer (data from port) : 512 bytes
- CAPTURE transmit buffer (data to port) : 256 bytes
-
- No flow control :
-
- No action is taken if comms buffers overflow, and data
- may be lost. However, this mode may be suitable for
- block data transmission (e.g. XMODEM), where the data
- block size is small enough to fit in OFFER's data buffers.
- Software flow control (XON/XOF)
- The software sends an XOF to interrupt the flow of
- incoming data when its buffers fill up. It sends an XON to
- restart data flow.
- If an XOF is received, no further data is transmitted until
- an XON arrives.
-
-
- Hardware flow control (RTS/CTS)
-
- The software controls RTS to stop the flow of incoming
- data when its buffers fill up.
- The software reacts to CTS to control the transmission of
- data.
- This is the most common form of hardware handshaking,
- and is suitable for use with most modems.
-
-
- Hardware flow control (DTR/DSR)
-
- The software controls DTR to stop the flow of incoming
- data when its buffers fill up.
- The software reacts to DSR to control the transmission of
- data.
-
-
-
- OFFER
- Function
-
- OFFER is the server program in the COMROUTE package. It
- runs on a PC which has a modem or other serial device attached
- to one of its serial ports. Other PCs (clients) may then attach to
- and utilise this port.
-
- OFFER should generally be started before any clients attempt to
- attach to it.
-
- Parameters
-
- -n<name> Sets the name by which the port will be known to
- the network. Up to 16 characters may be used -
- case is significant.
-
- Default if this parameter is omitted is "Comms".
-
- -c<port> Sets the port number to be utilised. Ports COM1
- to COM4 may be specified. DOS default settings
- for port address and IRQ will be used unless
- specified by the -a and -I parameters.
- The default port if this parameter is omitted is
- COM1.
-
- Defaults addresses and IRQs are :
-
- COM1 address 3F8, IRQ 4
- COM2 address 2F8, IRQ 3
- COM3 address 3E8, IRQ 4
- COM4 address 2E8, IRQ 3
-
- -a<address> Sets a non-standard port I/O address for this port.
- <address> is a hex value.
-
- Default if this parameter is omitted is the default
- address for the specified comms port.
-
-
- -i<IRQ> Sets a non-standard IRQ number for the interrupt
- on this port.
- Default if this parameter is omitted is the default
- IRQ number for the specified comms port.
-
-
- -f<mode> Specifies the flow control mode for the port.
-
- Possible values are :
-
- -fn No flow control
- -fs XON/XOF flow control
- -fh1 RTS/CTS flow control **
- -fh2 DTR/DSR flow control
-
- Default if this parameter is omitted is "no flow
- control".
-
- ** RTS/CTS flow control is recommended for
- use with most modems.
-
-
- CAPTURE
- Function
-
- CAPTURE is the client program in the COMROUTE package. It
- runs on a PC which has communications software that can be
- configured to use INT14.
-
- CAPTURE locates servers by polling for them. If you specify a
- server using the -n option, CAPTURE will search for that server.
- If the server is not specified or not found, CAPTURE will load
- but will not connect until UTIL is used to specify a connection.
- Note that you can set the flow control used by the server when
- loading CAPTURE. This is to allow multiple clients to use
- different flow-control modes if required.
-
- Parameters
- -n<name> Sets the name of the server to connect to.
-
- Default if this parameter is omitted is to load but
- not to connect to a server.
-
- -c<port> Sets the port number to be emulated by
- CAPTURE. Can be in the range 1 to 9.
- Default if this parameter is omitted is port 1.
-
- -f<mode> Specifies the flow control mode for the server
- port. Possible values are :
-
- -fn No flow control
- -fs XON/XOF flow control
- -fh1 RTS/CTS flow control **
- -fh2 DTR/DSR flow control
-
- Default if this parameter is omitted is "no flow
- control".
-
- ** RTS/CTS flow control is recommended for
- use with most modems.
-
-
-
-
- UTIL
-
- UTIL is a program which contains display and utility functions
- for both OFFER and CAPTURE.
-
- Its functions are all started by command line options.
-
- Unload CAPTURE / OFFER from memory
-
- Syntax : UTIL -u
- Applies to : CAPTURE and OFFER
-
- This function unloads CAPTURE or OFFER from memory,
- provided that no other TSRs have been loaded after them. If
- necessary, a disconnection is also performed.
-
- Disconnect Client from Server
-
- Syntax : UTIL -d
- Applies to : CAPTURE and OFFER
-
- This function disconnects (breaks) the link between CAPTURE
- and OFFER. Another client may then connect. Note that the
- disconnection may be made at either the client or the server.
-
- Display Configuration
-
- Syntax : UTIL -c
- Applies to : OFFER
-
- This function displays the configuration of the server.
-
- Display Configuration continuously
-
- Syntax : UTIL -C
- Applies to : OFFER
-
- This function displays the configuration of the server, refreshing
- regularly. Press Escape to stop the display.
-
- Display Statistics
-
- Syntax : UTIL -s
- Applies to : CAPTURE and OFFER
-
- This function displays statistics relating to IPX and serial
- communications.
-
- Display Statistics Continuously
- Syntax : UTIL -S
- Applies to : CAPTURE and OFFER
-
- This function displays statistics relating to IPX and serial
- communications, refreshing regularly. Press Escape to stop the
- display.
-
- Change Flow-Control Mode
-
- Syntax : UTIL -f<mode>
- Applies to : CAPTURE and OFFER
-
- Possible values of <mode> are :
-
- -fn No flow control
- -fs XON/XOF flow control
- -fh1 RTS/CTS flow control **
- -fh2 DTR/DSR flow control
-
- ** RTS/CTS flow control is recommended for
- use with most modems.
-
- Poll for Servers and select connection
-
- Syntax : UTIL -p
- Applies to : CAPTURE
-
- This function searches for all servers (copies of OFFER) visible
- on the network and lists them. The user can then select one to
- connect to.
-
- Poll for Servers and make connection
-
- Syntax : UTIL -P<name>
- Applies to : CAPTURE
-
- This function searches for all servers (copies of OFFER) visible
- on the network. If the server specified by <name> is found, it is
- connected to.
-
-
-
- ERROR MESSAGES
-
- CAPTURE
-
- Error-CAPTURE already installed
-
- CAPTURE is already resident in memory. CAPTURE
- will not be re-loaded.
-
- No servers detected
- A poll failed to discover any servers on the network.
- CAPTURE will still be loaded, but will remain inactive
- until at least one server is available. Connection can then
- be made using UTIL -p or UTIL -P to poll for servers
- again.
-
- Error-Invalid parameter
-
- An invalid command-line parameter was entered. Please
- correct the parameter and try again.
-
- Error-IPX support not present
-
- IPX support is not currently loaded. Please refer to your
- network software manuals.
-
- Error-IPX error code
-
- An IPX processing or communications error was
- detected. The error number is displayed. See separate list
- for codes.
-
- Fatal-out of memory
-
- The program ran out of heap. Please report this error if
- encountered.
-
-
-
- OFFER
-
- OFFER is already installed
-
- OFFER is already resident in memory. OFFER will not
- be re-loaded.
-
- Fatal : error allocating memory
- Fatal : out of memory
-
- The program ran out of heap. Please report this error if
- encountered.
-
- Error-Invalid parameter
-
- An invalid command-line parameter was entered. Please
- correct the parameter and try again.
-
- Fatal comms open error
-
- A fatal error was encountered opening the comms port.
- An error number is displayed. See separate list for codes.
-
- Error-IPX support not present
-
- IPX support is not currently loaded. Please refer to your
- network software manuals.
-
- Error-IPX error code
-
- An IPX processing or communications error was
- detected. The error number is displayed. See separate list
- for codes.
-
- Licence violation detected
- Operation suspended
-
- More than one copy of OFFER with the same serial
- number was detected on the network. Please unload all
- extra copies.
-
- Shareware version time-out
- Operation suspended
-
- The one-hour time limit on the shareware version has
- been reached. It will be necessary to re-boot the server to
- continue using COMROUTE.
-
-
- UTIL
-
-
- OFFER or CAPTURE are not currently installed
-
- OFFER or CAPTURE are not loaded. Please load one of
- them before running UTIL.
-
- -c option is not valid for CAPTURE
-
- The -c option only applies to OFFER, which is not loaded
- on this PC.
-
- -p option is not valid for OFFER
-
- The -p option only applies to CAPTURE, which is not
- loaded on this PC.
-
- ** FATAL : Invalid parameter
-
- An invalid command-line parameter was entered. Please
- correct the parameter and try again.
-
- Error - can't unload OFFER due to TSR installed after it
- Error - can't unload CAPTURE due to TSR installed after it
-
- Another TSR program has been installed after OFFER or
- CAPTURE. It is not possible to unload at this time.
-
- Unload request denied
-
- OFFER declined to unload, because of shareware time-
- out or licence violation detected.
-
- Already connected to server
-
- using UTIL -d before polling for servers.
-
- No servers located - cannot connect
-
- Polling failed to locate any available servers on the
- network. If servers are present, they may already be
- connected to another client.
-
-
-
- REGISTRATION
-
- Please support the Shareware concept by registering this program
- if you find it useful.
-
- Registering COMROUTE will bring the following benefits :
-
- 1) Printed manual (if delivered by mail)
- 2) Latest registered version of COMROUTE will be
- delivered.
- 3) The next major version of COMROUTE will be delivered
- to you free of charge.
- 4) Support will be given via e-mail or post.
-
- Registration costs £ 40 sterling or $ 60 US. You may register by
- the following means :
-
- 1) By post to :
-
- Mr R J Crowther
- 20, Howe Road
- Haverhill
- Suffolk
- CB9 9NJ
- England
-
- Please send either a personal cheque in sterling, or a
- money order for $ US. If you have no alternative, send
- notes/bills. All payments are sent at the sender's risk.
- Other forms of payment are not accepted at present.
- Please ask if you have a problem with these forms of
- payment.
-
- 2) On CompuServe, through the SWREG forum. This
- facility may not be available immediately, so please be
- patient.
-
- SUPPORT
-
- I will support registered users in the following ways :
-
- 1) By e-mail
-
- Please mail your queries to me via 100255,660 on
- Compuserve, or via the Internet to
- 100255,660@COMPUSERVE.COM
-
- 2) By post to :
- Mr R J Crowther
- 20, Howe Road
- Haverhill
- Suffolk
- CB9 9NJ
- England
-
- SUPPORT TO SHAREWARE USERS
-
- I may be able to help Shareware users, provided queries are sent
- by e-mail only. Time may limit the amount of support given to
- Shareware users - to obtain full support please register !
-
-
- Release History
-
- Version 1.00 Beta release 11/03/95
-
-
-
-
-