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1993-04-19
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SPORTSTER 14,400
APPENDIX E. FAX AND OTHER OPERATIONS
FAX OPERATIONS
Fax Modem Guidelines
Using your fax modem for facsimile
operations requires compatible facsimile
application software.
You can use the following command format
to switch between fax mode and data
mode. (Use as you would a standard AT
command.)
AT+FCLASS=n
The valid n values are 0 and 1. Use n =
0 (AT+FCLASS=0)
to switch the fax modem to data mode.
Use n = 1 (AT+FCLASS=1) to switch the
fax modem to fax mode.
To determine which mode the fax modem is
currently in, use the following command.
AT+FCLASS?
The modem will return a value of 0 to
indicate data mode or 1 to indicate fax
mode.
NOTE: Whenever the fax modem is reset
by using the ATZ command, by toggling
the DTR signal, or by turning the power
off and on, the modem will be set to
data mode.
A Note to Programmers
If you want to know more about the
supported fax commands, refer to the
standard for the Service Class 1 fax
protocol.
ANSI/EIA/TIA-578-1990 (EIA-578)
Asynchronous Facsimile DCE Control
Standard
November, 1990 Approved: October
22, 1990
You can obtain a copy of this standard
by contacting Global Engineering
Documents, at 1-800-854-7179.
HIGH SPEED/LOW SPEED PROTOCOL
Overview
This section explains how an answering
Sportster 14,400 modem switches its
connection rate to match the rate of a
calling modem. It may be of help to
those who want to try programming their
computers to switch rates to match the
Sportster 14,400's connection rate. The
material here applies only when the
modem is set for variable rates at both
the serial port and connection inter
faces, &B0 and &N0, respectively.
In both Originate and Answer modes, if
the connection rate is set to &N0, the
Sportster 14,400 negotiates with the
remote modem to connect at the highest
possible rate. In addition, if the
modem is set to Extended or Advanced
result codes (X1 or higher) it signals
the computer with one of the following
result codes or the optional error-
control (ARQ) result codes selected with
the &An command.
CONNECT (300 bps)
CONNECT 1200 (1200 bps)
CONNECT 2400 (2400 bps)
CONNECT 4800 (4800 bps)
CONNECT 7200 (7200 bps)
CONNECT 9600 (9600 bps)
CONNECT 12000 (12,000 bps)
CONNECT 14400 (14,400 bps)
The modem sends the result code at its
previous rate. Then it switches to the
new connection rate.
If your software doesn't switch rates
and you want to program it to do so, use
the example on the next page as a guide.
It demonstrates the occurrence of the
CONNECT codes in the connection
sequence, so that recognition of the
codes can be used to switch the
software. The example uses a sequence
of incoming calls, but the codes also
apply to Originate mode connections as
long as the modem dials out at a rate
higher than or equal to the remote
modem's rate.
The example below assumes the following
settings.
Software: Initially 19.2K or 38.4K
bps, allowing the following
range of connection rates:
14.4K/12K/9600/7200/4800/2400/12
00/300 bps
Modem: X1 or higher (rate-specific
CONNECT codes), &B0 (variable
serial port rate), &N0 (variable
connection rate)
Example
ModemSerial Port
Action Response Rate
1.Power on.
19,200
2.300-bps call comes in. RING
19,200
CONNECT 19,200
3.Data link is established.
300
Data transfer takes place.
4.Data session is over. NO CARRIER
300
Call is ended; loss of
carrier.
5.2400-bps call comes in. RING
300
CONNECT
2400 300
6.Data link is established.
2400
Data transfer takes place.
7.Data session is over. NO CARRIER
2400
Call is ended; loss of
carrier.
8.14,4K-bps call comes in. RING
2400
CONNECT 144002400
9.Data link is established.
19,200
Data transfer takes place.
10. Data session is
over. NO CARRIER19,200
Call is ended; loss of
carrier.
Explanation
1.The modem is powered on and is
operating at 19.2K bps or higher, so
that it is able to connect at 14.4K
bps as well as at lower rates.
2.A 300-bps modem calls. The Sportster
14,400 senses the incoming signal and
sends the messages RING and CONNECT
to the computer. These messages are
sent at 19.2K bps, the current serial
port rate.
3.Since the Sportster 14,400 responds
CONNECT, rather than with a rate
indicator, the software switches to
300 bps. The modem automatically
shifts to 300 bps to accept the data
from the incoming call.
4.The 300-bps data session is
terminated; the modem sends the
computer the message NO CARRIER at
300 bps.
5.A 2400-bps call comes in. The modem
responds RING and CONNECT 2400.
These message are sent at the current
bit rate of 300 bps.
6.The software, receiving the CONNECT
2400 message, adjusts accordingly to
the higher bit rate. The modem also
shifts to 2400 bps.
7.The 2400-bps data session is
terminated; the modem sends the
computer the message NO CARRIER at
2400 bps.
8.A 14,400-bps call comes in. The
modem responds RING and CONNECT
14400. These messages are sent to
the computer at the current bit rate
of 2400 bps.
9.The software, detecting the CONNECT
14400 message, adjusts accordingly to
the higher bit rate. The modem also
shifts to 14,400 bps.
10. The 14,400-bps data session is
terminated; the modem sends the
message NO CARRIER at 14,400 bps.
Keep in mind that whether or not your
computer adjusts to these rate changes,
the Sportster 14,400 automatically
shifts connection rates if it is set to
&N0.
VOICE/DATA COMMUNICATIONS
When you install the Sportster 14,400,
you have the option of plugging your
phone into the second modular jack of
the modem so it's available for voice
calls. You can also use the phone to
set up communications with another user
whose modem uses the AT command set,
such as a USRobotics or USRobotics-com-
patible modem.
Preparation
First call the other user to establish
the parity, word length and number of
Stop bits the other person's modem ac
cepts. Then turn the call over to your
modems, as follows.
Procedures
1.Without hanging up the phone, have
your modem go off hook in Originate
mode. Type the following command.
ATD <Enter>
NOTE: Be sure the modem is not set
to X2 or X4, or it will return the NO
DIAL TONE result code and hang up.
2.The other party should have the
remote modem go off hook in Answer
mode. The following command is used
to do this.
ATA <Enter>
3.Now both of you can hang up your
respective phones while the two
modems establish the data link. They
will maintain the link until one of
you gives your modem a command to
disconnect.
Either party's device can be the
originate or answer modem; it doesn't
matter who made the phone call. But
one modem must enter Originate mode
and the other then enter Answer mode.
You and the other party, therefore,
must agree on which command, ATD or
ATA, you will each use.