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- CAMP.DOC 1
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- - CAMP -
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- version 1.0
- (John's Happy Camper)
-
- 90-July-3
-
-
- A program to capture and analyze 2-way communications
-
- (C) Copyright 1990, D. John Repici
- All rights reserved.
-
- CIS: 73577,337
- GE: J.REPICI
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- The author of this program will assume no liability for losses caused by its
- use. This responsibility rests solely with the end user.
-
- CAMP is a copyrighted collection of program and documentation (the
- "package") produced by D. John Repici. The program and document may be
- copied and distributed for personal use provided that all components of the
- package remain together, and provided that the copyright notices are NOT
- REMOVED.
-
- CAMP or any part of CAMP may not be sold to produce income, or included as
- a component in a product or service which is intended to be sold to produce
- income, without permission from the author. The author reserves the right to
- withdraw any permission given. CAMP may not be distributed in any government
- or military sponsored database or network, nor may any part of CAMP.
-
- **A "Starving artist" donation of $15.00 will be gratefully accepted.
-
- Send to:
- John Repici; 120 Jefferson St.; Riverside, NJ 08075
-
- CAMP.DOC 2
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-
-
-
- Camp is:
-
- A program to allow your computer to monitor two-way RS-232 data transfers
- between a host and a terminal, or between any two RS-232 ports. You run it on
- a computer connected between the two ports. To the two devices it is connected
- to, it looks like a straight cable. It captures data and stores it in two
- separate files, one for data going from the terminal to the host, and another
- one for data going from the host to the terminal. There is byte-for-byte
- representation of the activity on the ports in these files.
-
- graphically:
-
- com1 com2
- | |
- [ HOST ]<------->[ your computer running CAMP ]<-------->[ TERMINAL ]
- | |
- | |
- | |
- RS-232 RS-232
-
-
-
-
-
-
- To run camp:
-
- Properly connect your computer between the two devices to be monitored
- (discussed later) and type CAMP at the DOS prompt. You will get CAMP's opening
- screen with the "top" menu. There are two menus in CAMP, this top one and the
- menu to change the com-port settings. To select an item on these menus, use
- the left and right arrow keys to move the pointer over the item and then hit
- the <enter> key. Next is a discussion of each item on both menus.
-
-
- CAMP.DOC 3
-
- The Top Menu:
-
- Record: Opens the files named with the "File" selection (discussed
- bellow) and begins monitoring the ports. If no file-name has
- been specified, this selection will not be made. When the
- files are opened, they are not zeroed. Any port activity
- previously recorded to the file will remain, new activity will
- be added on to the end of the file.
-
- F10 = Stop "Record" mode and return to the top menu.
- This is the only active key during recording. Note that the Esc
- key is reserved in the "Record" mode (future release).
-
-
- Playback: Allows you to play the files back side by side. Hitting the
- down-arrow while in this mode will display the next 12 bytes of
- the files being played. Hitting the PgDn key will display the
- next 36 bytes of the files. The F1 key will toggle between hex
- and ascii representations. Lastly, hitting the Esc key will
- stop the playback and take you back to the top menu. You can
- not rewind (at this release). In order to see the files again
- you must hit Esc, to go back to the top menu and then choose
- playback in order to view the files from the beginning.
-
- F1 = Hex/ascii Esc = return to top menu
-
-
- Com.. This will take you to the com-port menu, allowing you to change
- the port settings and to make those setting permanent. The
- com-port menu is discussed bellow.
-
- Hex/ascii This allows you to toggle between hex and ascii representations
- of the information displayed in the windows.
-
- File Lets you choose a file name to record in. The filename must be
- entered without an extension. Two files with the extensions
- .XX1 (for com1 input) and .XX2 (for com2 input) will
- automatically be created. If the file already exists they
- will not be destroyed. Any new data recorded into them will be
- recorded at the END of the existing data.
-
- Buf In order to maintain byte-for-byte synchronization between the
- recorded input of the two ports a special "buffer" byte must be
- added to take up space when one device is sending data and the
- other device is not. The byte used to pad the files can be
- selected by you using this menu-selection.
-
- erase As stated, a file that has already been recorded to will not be
- recorded over. All new data will be placed at the end of the
- file. If you want to start fresh with a filename that has
- already been used you can "erase" it. This selection will
- erase the file specified with the "File" menu item.
-
- Esc To exit the program, just hit the Escape key. You will be
- given your dos screen back.
-
-
-
- CAMP.DOC 4
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-
-
-
-
-
- The Com-port Menu:
-
-
- Baud Use to set the baud rate. place the pointer over this
- selection and hit enter repeatedly until the baud rate you
- want appears.
-
- Datab To select the number of data-bits (also called "word length")
- you want. Use the same way as the "Baud" selection.
-
- Par To select the correct parity: Odd, Even, Mark, Space, or None
-
- Stopb To select how many stop bits. If you select a word-length of
- "5" this will automatically be set at "1.5". The setting of
- 1.5 stop-bits is only permitted for 5-bit bytes.
-
- 1-name While displaying the files, it is convenient to not have to
- keep reminding yourself which port is connected to which
- device. This allows you to enter a label (typically the name
- of the device) for com1.
-
- 2-name Same as "1-name" but for com2.
-
- Altexe Alter-executable. This allows you to make CAMP.EXE come up
- with the settings you have selected for: Baud, Datab, Par,
- Stopb, 1-name, 2-name, and Buf (note that "Buf" can be changed
- from the top-menu). After selecting Altexe, the present
- settings will be made part of CAMP.EXE. Whenever you invoke
- CAMP from the DOS prompt in the future, it will have those
- settings. CAMP.EXE must be in your current-working-directory,
- for this option to work. Only the copy of CAMP.EXE that is in
- the current-working-directory will be updated.
-
- Esc Hitting the Escape key will take you back to the top menu when
- you are finnished making adjustments. Also, if you select
- "Altexe" it will automatically return you to the top when it
- has completed changing the executable file.
-
-
-
- CAMP.DOC 5
-
-
-
-
- Recording:
-
- To the disk file:
-
- All data saved to the disk files is synchronized byte-
- for-byte using the "Buf"fer byte. This synchronization
- occurs AT THE INTERRUPT routine. The EXACT activity at
- the ports is maintained in perfect fidelity.
-
-
-
-
- video output during recording:
-
- The data shown in the windows while CAMP is recording
- should not be taken too seriously. It is not
- synchronized, and worse, the ring buffers that service
- the video output during recording will "spill over"
- (they will ignore, and therefor lose, incoming data) if
- they become full. This will NOT EFFECT THE RECORDED
- DATA. only what's going past the windows while in
- "record" mode. The video output for recording is only
- there so you can see activity on the ports, and make
- some determination of what's going on.
-
-
- Playback:
-
- Using CAMP:
- When you play the files back using CAMP, they are
- displayed in perfect synchronization, side-by-side on
- the two windows. You can toggle between hex and ascii
- representation while in the "Playback" mode by hitting
- the F1-key.
-
- Using other techniques:
-
- For more convenient viewing (you can't move backwards
- when viewing a file in CAMP) of either the com1 input
- or the com2 input use a file viewing program such as
- "List", or a binary editor. The files are composed of
- only the port data (and the Buffer bytes to synchronize
- them).
-
-
- CAMP.DOC 6
-
-
-
- RS-232 connections:
-
-
-
- For asynchronous communication the usual configuration of an rs-232 port is as
- a DTE or a DCE. The problem comes from the fact that the rs-232 standard is
- full duplex, meaning it sends data out one line, and receives data back in on a
- different line. A DTE port will send data out on line 2 and receives data in
- from line 3. A DCE port will send data out on line 3 and receive data in from
- line two. Note how this makes the two complimentary. Your computer is
- "almost" ALWAYS a DTE, while, a modem for example, is a DCE. This makes
- connecting a modem to a computer very easy. The data output by the computer on
- line two is received in by the modem on its line-two, while the data output by
- the modem on line three is received in by the computer on the same line.
- graphically:
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-
- _____________________ _____________________
- | | | DCE |
- | DTE |pin 2 pin 2| |
- | data out ---> |-------------------->|--> data in |
- | | | |
- | data in <-----|<--------------------| <---data out |
- | |pin 3 pin 3| |
- | | | |
- |_____________________| |_____________________|
-
-
-
-
- The problem arises when you try to hook two DTEs or two DCEs together. For
- example, two DTEs (two computers for example).
-
-
-
- _____________________ _____________________
- | | | DTE |
- | DTE |pin 2 pin 2| |
- | data out ---> |---------------------| <--- data out |
- | | | |
- | data in <-----|---------------------|------> data in |
- | |pin 3 pin 3| |
- | | | |
- |_____________________| |_____________________|
-
-
-
- Note that the data going OUT of one piece of equipment is going to the pin on
- the other piece of equipment that is _itself_ sending data OUT. Likewise with
- the data in pins. Here's where you need a "null modem", or "null cable" which
- crosses the two lines so that two DCEs (or DTEs) can talk to each other.
-
-
-
- CAMP.DOC 7
-
-
-
- So we can make these assumptions:
-
-
- ------------ = existing cable =============== = added cable
- (not null)
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- +@ = added null modem adapter to camp
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-
-
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-
-
- (null)
- dTe=========================+@CAMP--------------------------dTe
-
-
-
-
-
- (null)
- dTe---------------------------CAMP+@========================dTe
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-
-
-
-
- (straight)
- dTe=========================+@CAMP--------------------------dCe
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-
-
-
-
- (straight)
- dTe-------------------------+@CAMP+@========================dCe
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-
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-
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- The worst case is DTE to DCE when you're on the DCE side. Carry two null
- adapters and a straight cable to cover all bases. Better have a couple of
- gender changers in the kit too.
-
-
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- CAMP.DOC 8
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- History:
-
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- Release Date Particulars
-
- 1.0 7/3/90 First release.