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Ham Radio Version 3.2 (Chestnut CD-ROMs)(1993).ISO
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1984-04-19
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16KB
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622 lines
MULTICOMM
OPERATING INSTRUCTIONS
Version 2.00
MULTICOMM software enables the IBM Personal Computer to support
ASCII, RTTY (radio teleprinter) and MORSE CODE communications.
Telephone communication requires a standard modem connected to the IBM
PC serial port. Radio communication is possible when a terminal unit
with an RS-232 interface is connected to the IBM PC serial port. Morse
Code support is limited to transmission only.
The program operates in two different modes. The MENU mode is used
to select terminal parameters or options. The TERMINAL mode is for
communications.
INITIAL PROGRAM DEFAULTS
=====================================================
SPEED -------------------- 60 Baudot
SERIAL PORT -------------- COM1
PARALLEL PORT ------------ LPT1
ECHO --------------------- ON
FILTER ------------------- OFF
UNSHIFT ON SPACE --------- ON
RELAY -------------------- OFF
BELL --------------------- ON
OPERATION IN THE MENU MODE
Select the MENU mode by pressing the ESC key from the terminal
mode. The current operating parameters are displayed in highlighted
video. You can quickly make changes by pressing the key corrresponding
to a new choice. MULTICOMM lets you enable this change immediately by
pressing the ENTER key, or make additional selections. When the ENTER
key is pressed, all of the highlighted parameters go into effect, the
menu screen clears and the system reverts to the terminal mode for
communications.
Pressing the ESC key in the MENU mode will void any selections,
and return to the terminal mode with the old parameters still in
effect. In the MENU mode, incoming data is stored in the Comm Buffer
and will be dumped to the screen when you return to the terminal mode.
To return to DOS from the Menu mode, press the END key.
SPEEDS
Available speed selections are shown with the current operating
speed in highlighted video. To select another speed in the MENU mode,
press the function key that corresponds to the new speed.
"F1" Baudot, 45 baud, 5 data bits, Parity none, 2 stop bit(s)
"F2" Baudot, 50 baud, 5 data bits, Parity none, 2 stop bit(s)
"F3" Baudot, 65 baud, 5 data bits, Parity none, 2 stop bit(s)
"F4" Baudot, 74 baud, 5 data bits, Parity none, 2 stop bit(s)
"F5" ASCII, 110 baud, 7 data bits, Parity even, 2 stop bit(s)
"F6" ASCII, 300 baud, 7 data bits, Parity even, 1 stop bit(s)
"F7" ASCII, 1200 baud, 7 data bits, Parity even, 1 stop bit(s)
"F8" ASCII, 2400 baud, 7 data bits, Parity even, 1 stop bit(s)
"F9" Morse Code, Transmit speed as shown.
"F10" Morse Code, Set transmit speed between 5 and 95 wpm.
SWITCHES
These features are turned ON or OFF by pressing the associated key.
"E" ECHO ------------- ON=Half Duplex, OFF=Full Duplex (ASCII)
"F" FILTER ----------- Discard extraneous incoming characters
"U" UNSHIFT ON SPACE - Reset to letters case on space (Baudot)
"R" RELAY ------------ Close cassette relay on PTT or Morse Code
"B" BELL ------------- Sound incoming character or margin bell
PORTS
These ports may be selected by pressing the associated key.
"C" COM1/COM2 -------- Serial Communications Port.
"L" LPT1/LPT2/LPT3 --- Parallel Printer port.
SYSTEM CONFIGURATION
COMM BUFFER ------ The amount of free space remaining in the
receive buffer. As this free space drops
below 128 characters, "Comm Buffer" will
flash as a warning.
RAM -------------- The amount of system Random Access Memory
available.
TIME ------------- The time adjusted to the user selected
offset.
FUNCTION KEYS
Function key messages are assigned by pressing the "A"
(Assignment) key in the MENU mode.
Function key Directories are displayed by pressing the "D"
(Directories) key in the MENU mode.
DEFAULT SETTINGS
To create a default setup file, select the parameters to be
stored, then press "W" (Write). The highlighted values will be written
to the MCOMM.SET file. MULTICOMM will load these parameters on start
up.
To reload the default values stored on disk, press and hold the
Ctrl key then press the ENTER key. The parameters will be read from
the MCOMM.SET file and loaded into the program.
OPERATION IN THE TERMINAL MODE
In the TERMINAL mode, characters typed on the keyboard are sent to
the selected serial port for transmission to the terminal unit or
modem. Data coming in from the terminal unit or modem is displayed on
the screen.
Pressing the ESC key in the TERMINAL mode will cancel your last
command or display the main menu. To return to DOS from the terminal
mode, press the END key.
STATUS LINE DISPLAY
A Speed Status Line appears at the bottom of the screen to display
the current SPEED and FILTER status as well as: F1=Function Keys
ESC=Menu HOME=Help END=Exit. Pressing the F1 key toggles line 25 to
the Function Key Status Line, which displays abbreviated F1-F10
function key assignments.
PRINTOUT
MULTICOMM allows the printout of incoming data, as well as data
generated from the keyboard. The F2 key toggles the printout ON and
OFF. The blinking "PRINT" on the Function Key Status Line indicates
the printout is active. A line is printed each time a carriage return
occurs or a line contains 80 characters.
The printout is automatically terminated under certain
conditions. For example, if you select a printer port without a
printer, the program will pause about 30 seconds, no incoming data
will go to the screen and keyboard data is ignored. At the end of this
interval "Printer Unavailable!" appears in highlighted video. If the
data rate is too fast for the printer to keep up with, the printout
will be turned off to prevent incoming data from being lost.
RECEIVING A FILE
Received data is stored on disk by pressing the F3 key in the
terminal mode. A highlighted prompt will appear on the screen. Enter
the filename you want the data to be stored under. For example, if you
are receiving the UPI news service you may store it as "PRESS",
"PRESS.TXT", "A:PRESS.UPI" or any valid DOS filename. A blinking "RX"
on the Function Key Status Line indicates file reception is active.
To terminate, press the F3 key in the terminal mode. The receive
buffer contents will be written to disk, and file reception ended.
TRANSMITTING A FILE
Select file transmission by pressing the F4 key in the terminal
mode. A highlighted prompt asks for the name of the file to transmit.
When transmission begins, line 25 is replaced by a File Transmission
Status Line, to show the number of remaining 128 character blocks to
be sent. Press the F4 key to terminate the transmission.
VIEWING A FILE
It is possible to view any ASCII file by pressing the F5 key. A
highlighted prompt requests the file to be viewed. Type the filename
and press ENTER, the file will scroll on the screen and pause, press
the SPACEBAR to continue viewing. Press the F5 key to terminate
viewing. Data coming in while viewing a file is stored in the receive
buffer and will be printed to the screen when the file viewing is
ended.
ERASING A FILE
You need not exit to DOS to erase a file. Press the F6 key and
specify the filename to be erased. A prompt asks for confirmation to
erase the file. If you answer "Y" (Yes) the file is erased and lost.
Any other response will cancel the procedure.
CAPTURING SCREEN DATA
A copy of the terminal screen may be stored on disk even though
the file receive mode is not active. Press the F7 key, data is written
to a file called SCREEN.DAT, a tone sounds, and the program reverts to
the terminal mode.
SENDING A BREAK SIGNAL
A break is the transmission of a continuous space signal for a
period of time. In communications between two computers the signal is
sent as an interrupt to the other computer to stop its transmission
and listen for data. In radio communications the break signal can be
used to test the space tone transmitted by the terminal unit. Press
the F8 key in the terminal mode to send a 1/2 second break signal. In
Morse Code the proword "BT" will be sent.
CLEARING THE SCREEN
Clear the screen in the terminal mode by pressing the F9 key. This
function does not erase the status line at the bottom of the screen.
ACTIVATING PTT
Pressing the F10 key in the terminal mode toggles the PTT signal
ON and OFF for use with a radio transmitter. When "PTT" on the
Function Key Status Line is flashing, the RTS (Ready to Send) signal
at the selected serial port is activated. If the RELAY function is ON
the relay contacts will be closed. In Morse Code operation the RTS
signal is activated, but not the relay, since it operates in
conjunction with the tone output for each character.
CHANGING SPEEDS IN THE TERMINAL MODE
Speed changes are made from the terminal mode by first pressing
and holding the Alt key then pressing an F1 through F10 key
corresponding to the speed selection function keys in the main menu.
For example, Alt F1=60 wpm Baudot, Alt F2=66 wpm Baudot, Alt F3=75 wpm
Baudot, etc. A list of the speed assignments appears in the function
key directory.
TOGGLING SWITCHES IN THE TERMINAL MODE
Switches are toggled from the terminal mode by first pressing and
holding the Alt key then pressing the key corresponding to the switch
selection key in the main menu. For example, Alt "E" will toggle the
Echo feature, Alt "F" will toggle the Filter, etc.
PREDEFINED MESSAGES
You can send predefined messages in the terminal mode by first
pressing and holding down the Ctrl key then pressing an F1 through F10
key corresponding to the message to be sent. The messages are assigned
by selecting Alt "A" in the terminal mode which displays a Function
Key Assignment Screen for entering messages. A directory of these
messages is available by pressing Alt "D" from the terminal mode and
continuing to page 2.
RELAY WIRING
The cassette motor control relay on the IBM PC can be used to
control the Push To Talk or CW (Morse Code) Key circuit of a
transmitter. The relay contacts appear on pins 1 and 3 of the 5-Pin
DIN connector on the back of the computer. The relay can be
deactivated by switching the RELAY function off from the menu.
RS-232 WIRING
MULTICOMM disables the Clear To Send signal to simplify the
connections between the IBM Personal Computer and the terminal unit.
Feed the audio signal from your radio into the terminal unit and
follow the manufacture's instructions, or those below for wiring to
the computer's serial port.
IBM PC RS-232 PORT TERMINAL UNIT RS-232
------------------ --------------------
Pin 1 Ground to Pin 1 Ground
Pin 2 TX data to Pin 3 Data in
Pin 3 RX data to Pin 2 Data out
Pin 7 Signal ground to Pin 7 Signal ground
Pin 20 Ready To Send to Pin 20 PTT control
TERMINAL UNITS
A terminal unit is a modem designed to operate with radio
communications equipment and employs standard audio frequency shifts.
The shift is the difference in the audio frequencies between the mark
and the space signals. Amateur RTTY communications, for the most part,
is standardized at 170 Hz shift. Other shifts are 850 Hz (used by the
weather bureau) and 425 Hz (used by many commercial press stations.)
On a single sideband radio the receiver BFO allows you to tune the
frequency over a wide range of audio tones, but the audio shift
between the two tones will remain constant regardless of the carrier
frequency. Most terminal units use 2125 Hz as the MARK tone with the
SPACE tone up in frequency by the ammount of shift being used.
Additional audio filtering is used so that reliable communications may
be carried on in the noisy conditions found on the high frequency
radio bands.
Terminal units generally incorporate circuitry to detect the
presence of a valid RTTY signal in order to make unattended operation
possible. This process is known as "autostart" and prevents garbage
from being printed by random noise signals.
RECEIVING RTTY SIGNALS
Receiving RTTY signals can be confusing. Many RTTY signals on the
high frequency bands are encrypted, or are in a foreign language using
other than the latin alphabet. We recommend you begin RTTY listening
in the amateur bands. Here you will find signals most of the time as
well as a known shift and speed. Most amateur RTTY occurs at 60 wpm
Baudot using 170 Hz shift and is centered between 14.075 and 14.100
Mhz. Set your HF receiver on lower sideband and slowly tune in a RTTY
signal following the instructions for your terminal unit. MULTICOMM
software and your IBM PC will do the rest.
Copyright (C) 1984
MULTICOMM COMMUNICATIONS SOFTWARE
1806 Foxwood Drive, Houston Texas 77008