NetComm InModem 56 User manual

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Table of Contents.
System Requirements............................................................................................................2
Package inclusions.................................................................................................................2
Modem Installation .................................................................................................................2
Using Your Modem.................................................................................................................4
Troubleshooting......................................................................................................................5
Appendix A: AT Command Reference...................................................................................6
Appendix B: S-Registers......................................................................................................21
Appendix C: Modem Specifications .....................................................................................27

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System Requirements
•Computer with Pentium 166 MMX or higher processor.
•Windows 95/98, NT 4 or 2000 Operating System.
•Analogue Telephone line.
•1 available PCI slot.
•CD-ROM drive.
Package inclusions
•Modem.
•Telephone lead (RJ11-RJ11).
•Telephone lead adaptor (605 – RJ11).
•Quick Start Guide.
•NetComm CD.
•Warranty card.
•ISP (Internet Service Provider) CD.
Modem Installation
1. Turn off your computer and disconnect the power cable.
2. Remove the cover from your computer. Please check your computer’s manual for
instructions and cautions regarding the removal of covers or installation of add-in boards.
3. Select an empty PCI slot and remove the appropriate expansion slot cover from the
computer. 4.
Fig: Computer Internals
ISA SLOT
PCI SLOTRemoved
expansion
slot cover

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4. Insert the InModem 56 into the PCI slot and secure with a screw in the backplane.
5. Replace the Computers cover.
6. Insert one end of the telephone cord into the Modem’s Line (top) Socket
7. Connect the other end of the phone cord to a telephone phone point, via the supplied
adaptor (RJ11-605) if required.
8. Turn on your computer.
9. As Windows 95 or 98 starts (Windows NT 4 and 2000 users skip this instruction) it will
detect that new hardware has been added, and start the “Add New Hardware Wizard”
(Windows 9x only). Click on Cancel.
10.Insert the NetComm CD into your CD-ROM drive.
11.The CD should autostart, displaying the following window. If it does not start click on
Start – Run and type in D:\autorun.exe where D is the drive letter of your CD-ROM drive.
12.Select “Install Modem Driver”.
13.Click on OK to confirm the installation.

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14.As the drivers are being installed this Window will
be displayed.
15.Windows 95 and 98
Tthe Add New Hardware wizard pop up momentarily while the drivers are added and
then the above window will close automatically.
Or
Windows 2000 – You will be informed that “Digital Signature Not Found”. Click on Yes
to complete the installation.
Or
Windows NT 4 – After the drivers are installed you will be informed that you need to
Restart you computer before you can use your modem. Click OK to restart, or Cancel to
restart later.
Using Your Modem
Your modem is now ready to use. Included with your modem is the following software:
•Bitware Fax software that allows you to send and receive faxes directly from your PC. To
install Bitware click on the “Install Bitware Fax Software” link on the NetComm CD.
•ISP Software allows you to sign up with an ISP (Internet Service Provider) to connect to
the Internet.
Most Windows communications software will either auto detect your modem, or ask you
which modem you wish to use with it. Choose the NetComm InModem 56 (IN5692). If the
software asks you which COM port to use you can determine this by going to the Control
Panel – Modems – NetComm InModem 56 – Properties and the Port that the modem is
configured to (often COM 3) will be displayed.

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Troubleshooting
Problem:
The modem keeps disconnecting.
Resolution:
1. Turn off call waiting.
2. Disconnect all other telephone devices (telephone handsets, answering
machines, faxes, cordless phones) connected to the phone line.
3. Check for updated drivers on the NetComm Web site
http://www.netcomm.com.au
Problem:
The modem is reporting NO DIALTONE.
Resolution:
1. Check that the phone line is plugged into the modems LINE (not Phone) socket.
2. Check that no one else is using a phone that is connected to the same phone
line.
3. Go to Control Panel – Modems – NetComm InModem 56 – Properties –
Connection and remove the tick in the “Wait for dial tone before dialing”
checkbox.
Problem:
The modem is not responding.
Resolution:
1. Make sure that there are no other packages communicating with the modem. In
particular check that there are no fax packages running.
2. Check the System properties (Control Panel – System – Device Manager in
Windows 95 & 98) to make sure there are no system conflicts listed.
3. Try restarting your computer.
4. Go to Control Panel – Modems – Diagnostics and highlight the Com port listed
next to the NetComm InModem 56 and then click on “More Info”. If the modem is
responding you will be presented with a window with the modems responses to a
number of AT commands.
5. Try inserting the modem into a different PCI slot.
Problem:
The modem will not connect.
Resolution:
1. Try connecting to a different phone number.
2. Try connecting from a different phone line (if possible).
3. Disconnect all other telephone devices (telephone handsets, answering
machines, faxes, cordless phones) connected to the phone line.
Problem:
The modem won’t connect at 56k speeds.
Resolution:
1. The server you are dialing might not support 56k speeds.
2. Your phone line might not support 56k speeds.

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Appendix A: AT Command Reference
AT commands are issued to the modem to control the modem's operation and software
configuration. AT commands can only be entered while the modem is in command mode. The
format for entering AT commands is: TYPE: ATXn where X is the AT command and n is the
specific value for that command. PRESS: Enter If n is omitted from a command that takes a
parameter value, the value 0 I(zero) is assumed.
Any command issued is acknowledged with a response in either text or numeric values
known as result codes. Table 2 lists all the valid result codes.
In the following listing, all commands and command-values accepted by the modem are
shown; any entries other than those shown cause the ERROR result code.
+++ Escape sequence
The escape sequence allows the modem to exit data mode and enter on-line command
mode. While in on-line command mode, you may communicate directly to your modem using
AT commands. Once you are finished, you may return to data mode using the ATO
command. A pause, the length which is set by the Escape Guard Time (S12), must be used
before and after an escape sequence is issued. This pause prevents the modem from
interpreting the escape sequence as data.
The value of the escape sequence character may be changed using Register S2.
A/ Repeat Last Command
This command repeats the last command string entered. Do not precede this command with
an AT prefix or conclude it by pressing Enter.
A Answer Command
This command instructs the modem to go off-hook and answer an incoming call.
Bn Communication Standard Setting
This command determines CCITT vs. Bell standard.
B0: Selects CCITT V.22 mode when the modem is at 1200 bits/s.
B1: Selects Bell 212A when the modem is at 1200 bits/s (default).
B2: Unselects V23 reverse channel (same as B3 ).
B3: Unselects V23 reverse channel (same as B2 ).
B15: Selects V.21 when the modem is at 300 bits/s.
B16: Selects Bell 103J when the modem is at 300 bits/s (default).
Result Codes:
OK n = 0, 1, 2, 3, 15, 16
ERROR Otherwise
Cn Carrier Control
The modem will accept the C1 command without error in order to assure backward
compatibility with communications software that issues the C1 command. However, this
modem does not support the C0 command. The C0 command may instruct some other
modems not to send carrier (i.e., it puts them in a receive-only mode).
C0: Transmit carrier always off.

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C1: Normal transmit carrier switching.
Result Codes:
OK n = 1
ERROR Otherwise
Dn Dial
This command instructs the modem to begin the dialing sequence. The dial string (n,
including modifiers and the telephone number) is entered after the ATD command. A dial
string can be up to 60 characters long. Any digit or symbol (0¾9, *, #, A, B, C, D) may be
dialed as touch-tone digits. Characters such as spaces, hyphens, and parentheses do not
counτ¾they are ignored by the modem and may be included in the dial string to enhance
readability. The following may be used as dial string modifiers:
LRedials last number. Should be the first character following ATD, ignored
otherwise.
PPulse dialing.
TTouch-tone dialing (default).
,Pause during dialing. Pause for time specified in Register S8 before processing the
next character in the dial string.
WWait for dial tone. Modem waits for a second dial tone before processing the dial
string.
VThe modem switches to speakerphone mode and dials the number. An ATH
command may be used to disconnect the voice call.
@Wait for quiet answer. Wait for five seconds of silence after dialing the number. If
silence is not detected, the modem sends a NO ANSWER result code back to the
user.
!Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return to
off-hook.
;Return to command mode. Causes the modem to return to command mode after
dialing the number, without disconnecting the call.
^Disable data calling tone transmission.
S=n Dial a telephone number previously stored using the &Zn=x command (see the
&Zn=x command for further information). The range of n is 0—3.
En Echo Command
This command controls whether or not the characters entered from your computer keyboard
are echoed back to your monitor while the modem is in command mode.
E0: Disables echo to the computer.
E1: Enables echo to the computer (default).
Result Codes:
OK n = 0, 1
ERROR Otherwise
Fn Online Data Character Echo Command
This command determines if the modem will echo data from the DTE. This modem does not
support the F0 version of the command. However, the modem will accept F1, which may be

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issued by older communication software, to assure backward compatibility.
F0: Online data character echo enabled (NOT SUPPORTED).
F1: Online character echo disabled.
Result Codes:
OK n = 1
ERROR Otherwise
Hn Hook Control
This command instructs the modem to go on-hook to disconnect a call, or off-hook to make
the phone line busy.
H0: Modem goes on-hook (default).
H1: Modem goes off-hook.
Result Codes:
OK n = 0, 1
ERROR Otherwise
In Request ID Information
This command displays specific product information about the modem.
I0: Returns modem identity string and driver version number, same as I3.
I1: Calculates ROM checksum and displays it on the DTE.
I2: Performs a ROM check and calculates and verifies the checksum displaying OK or
ERROR.
I3: Returns modem identity string and driver version number, same as I0.
I4: Returns firmware version for data pump.
I5: Returns the code ver, board ID, country ID and subsystem vendor ID in
hexadecimal
I6-8: Returns OK for compatibility.
I9: Returns country ID in English.
I11: Displays connection information as described in the following example.
Result Codes:
As described n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11
ERROR Otherwise
The ATI11 result has two pages; the user must hit a key to get the second page. See the
following example:
ati11
Description K56flex connection V.90 Connection
--------------- ------------------ ---------------
1 Last Connection 56K V.90
2 Initial Transmit Carrier Rate 28800 28800
3 Initial Receive Carrier Rate 50000 49333
4 Final Transmit Carrier Rate 28800 28800
5 Final Receive Carrier Rate 50000 49333
6 Protocol Negotiation Result LAPM LAPM
7 Data Compression Result V42bis V42bis

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8 Estimated Noise Level 152 152
9 Receive Signal Power Level (-dBm) 25 25
10 Transmit Signal Power Level (-dBm) 16 16
11 Round Trip Delay (msec) 4 4
Press any key to continue; ESC to quit.
12 Near Echo Level (-dBm) NA NA
13 Far Echo Level (-dBm) NA NA
14 Transmit Frame Count 3 3
15 Transmit Frame Error Count 0 0
16 Receive Frame Count 0 0
17 Receive Frame Error Count 0 0
18 Retrain by Local Modem 0 0
19 Retrain by Remote Modem 0 0
20 Call Termination Cause 0 0
21 Robbed-Bit Signaling 00 00
22 Digital Loss (dB) 6 6
23 Remote Server ID 4342C3 NA
OK
The ATI11 command may be issued from on-line command mode or after the end of a call.
After a call, some of the values are no longer valid; it's useful to know which ones. Each of the
line items in the ATI11 result is explained next:
1. V.90, 56K, V.34, or V.32 depending on the type of connection negotiated.
2. Initial upstream rate
3. Initial downstream rate
4. Current or final upstream rate
5. Current or final downstream rate
6. LAPM or MNP or None, depending on V.42 negotiation
7. V42bis or MNP or None, depending on V.42 negotiation
8. Mean-square error of received downstream signal. Difference between received
constellation point and reference decision point. This is a dimensionless decimal number, only
valid during a call. Higher numbers are worse. There's no absolute threshold of goodness; it
depends on the downstream data rate. The number varies during a call, so it can be useful to
sample it a few times.
9. The received signal power, although labeled -dBm, is only a relative measure for
comparing calls to/from different locations. Only valid during a call.
10. Upstream transmit signal power.
11. Round-trip delay in milliseconds.
12. Echo levels are valid for V.34 only.
13. Echo levels are valid for V.34 only.
14. Number of LAPM frames sent upstream during this call. Count wraps around at 65535.
15. Number of REJ frames received at the analog client modem.
16. Number of LAPM frames received by client during this call. Count wraps around at 65535.
17. Number of frames received in error by the client.
18. Number of retrains or rate renegotiations requested by this modem.
19. Number of retrains or rate renegotiations requested by remote modem.
20. Reason for call ending, only valid after call ends:
0 = Local modem command: ATH, DTR drop
1 = Remote modem: cleardown, loss of signal
2 = No answer, busy, etc.
3 = Training failure V.90, K56flex or V.34.
4 = Protocol failure if required by \N4, for example.
21. For PCM connection only, a hexadecimal 6-bit pattern of T1 frames with robbed-bit
signaling.
22. For PCM connection only, the downstream digital loss.
23. For K56flex connection only, the V.8bis info sent by the server. Meaning is defined at the
server and by
convention. Example above is from a recent Ascend MAX in m-Law.
Ln Monitor Speaker Volume
This command sets speaker volume to low, medium, or high.

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L0: Selects low volume.
L1: Selects low volume.
L2: Selects medium volume (default).
L3: Selects high volume.
Result Codes:
OK n = 0, 1, 2, 3
ERROR Otherwise
Mn Monitor Speaker Mode
This command turns the speaker on or off.
M0: The speaker is off.
M1: The speaker is on until the modem detects the carrier signal (default).
M2: The speaker is always on when modem is off-hook.
Nn Modulation Handshake
This command controls whether or not the local modem performs a negotiated handshake at
connection time with the remote modem when the communication speed of the two modems
is different.
N0: When originating or answering, this is for handshake only at the communication
standard specified by S37 and the ATB command.
N1: When originating or answering, begin the handshake only at the communication
standard specified by S37 and the ATB command. During handshake, fallback to a
lower speed may occur (default).
Result Codes:
OK n = 0, 1
ERROR Otherwise
On Return On-line to Data Mode
O0: Instructs the modem to exit on-line command mode and return to data mode (see
AT Escape Sequence, +++).
O1: This command issues a retrain before returning to on-line data mode.
O3: This command issues a rate renegotiation before returning to on-line data mode.
Result Codes:
OK n = 0, 1, 3
ERROR Otherwise
P Select Pulse Dialing
This command configures the modem for pulse (non touch-tone) dialing. Dialed digits are
pulsed until a T command or dial modifier is received. Tone dial is the default setting.
Qn Result Code Control
Result codes are informational messages sent from the modem and displayed on your
monitor. Basic result codes are OK, CONNECT, RING, NO CARRIER, and ERROR. The
ATQ command allows the user to turn result codes on or off.

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Q0: Enables modem to send result codes to the computer (default).
Q1: Disables modem from sending result codes to the computer.
Result Codes:
OK n = 0, 1
ERROR Otherwise
T Select Tone Dialing
This command instructs the modem to send DTMF tones while dialing. Dialed digits are tone
dialed until a P command or dial modifier is received. This is the default setting.
Vn DCE Response Format
This command controls whether result codes (including call progress and negotiation
progress messages) are displayed as words or their numeric equivalents. For the result code,
see table 4.
V0: Displays result codes as digits.
V1: Displays result codes as text (default).
Result Codes:
OK n = 0, 1
ERROR Otherwise
Wn Result Code Option
W0: CONNECT result code reports DTE receive speed. Disable protocol result
codes.
W1: CONNECT result code reports DTE receive speed. Enable protocol result codes.
W2: CONNECT result code reports DCE receive speed. Enable protocol result codes
(default).
Result Codes:
OK n = 0, 1, 2
ERROR Otherwise
Xn Result Code Selection and Call Progress Monitoring
This command enables tone detection options used in the dialing process. As these functions
are chosen, the modem chip set’s result codes are also affected. Therefore, this command is
frequently used to control the modem chip set’s responses. The primary function of this
control is to control the modem chip set’s call response capabilities.
X0 Ext. Result Code Dial Tone Detect Busy Tone Detect
X1 Disable Disable Disable
X2 Enable Disable Disable
X3 Enable Enable Disable
X4 Enable Disable Enable (default)
X5 Enable Enable Enable
X6 Enable Enable Enable
X7 Enable Enable Enable
X8 Disable Enable Enable
Extended Result Codes
Disabled: Displays only the basic result codes OK, CONNECT, RING, NO
CARRIER, and ERROR.

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Enabled: Displays basic result codes, along with the connect message and the
modem's date rate, and an indication of the modem's error correction and data
compression operation.
Dial Tone Detect
Disabled: The modem dials a call regardless of whether it detects a dial tone. The
period of time the modem waits before dialing is specified in register S6.
Enabled: The modem dials only upon detection of a dial tone, and disconnects the
call if the dial tone is not detected within 10 seconds.
Busy Tone Detect
Disabled: The modem ignores any busy tones it receives.
Enabled: The modem monitors for busy tones.
Result Codes:
OK n = 0, 1, 2, 3, 4, 5, 6, 7
ERROR Otherwise
Yn Long Space Disconnect
Long space disconnect is always disabled.
Y0: Disable long space disconnect (default).
Y1: Enable long space disconnect (NOT SUPPORTED).
Result Codes:
OK n = 0
ERROR Otherwise
Zn Recall Stored Profile
This command instructs the modem chip set to go on-hook and restore the profile saved by
the last &W command. Either Z0 or Z1 restores the same single profile.
Result Codes:
OK n = 0, 1
ERROR Otherwise
&Bn V.32 Auto Retrain
This modem always auto retrains.
&B0: Disable V.32 auto retrain (NOT SUPPORTED).
&B1: Enable V.32 auto retrain (default).
Result Codes:
OK n = 1
ERROR Otherwise
&Cn Data Carrier Detect (DCD) Control
Data Carrier Detect is a signal from the modem to your computer indicating that the carrier
signal is being received from a remote modem. DCD normally turns off when the modem no
longer detects the carrier signal.
&C0: The state of the carrier from the remote modem is ignored. DCD circuit is
always on.

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&C1: DCD turns on when the remote modem's carrier signal is detected, and off
when the carrier signal is not detected (default).
Result Codes:
OK n = 0, 1
ERROR Otherwise
&Dn DTR Control
This command interprets how the modem responds to the state of the DTR signal and
changes to the DTR signal.
&D0: Ignore. The modem ignores the true status of DTR and treats it as always on.
This should only be used if your computer does not provide DTR to the modem.
&D1: If the DTR signal is not detected while in on-line data mode, the modem enters
command mode, issues OK result code, and remains connected.
&D2: If the DTR signal is not detected while in on-line data mode, the modem
disconnects (default).
&D3: Reset modem on the on-to-off DTR transition.
Result Codes:
OK n = 0, 1, 2, 3
ERROR Otherwise
&Fn Load Factory Settings
This command loads the configuration stored and programmed at the factory. This operation
replaces all of the command options and the S-register settings in the active configuration
with factory default values.
Note: In voice mode (AT+FCLASS=8), if the AT&F command is placed on the same line as
other commands, the command line is ignored. To load factory settings in voice mode, issue
AT&F by itself.
Result Codes:
OK n = 0
ERROR Otherwise
&Gn V.22bis Guard Tone Control
This command determines which guard tone, if any, to transmit while transmitting in the high
band (answer mode). This command is only used in V.22 and V.22bis mode.
&G0: Guard tone disabled (default).
&G1: Sets guard tone to 550 Hz.
&G2: Sets guard tone to 1800 Hz.
Result Codes:
OK n = 0, 1, 2
ERROR Otherwise
&Jn Auxiliary Relay option
&J0: The auxiliary relay is never closed. (Default)
&J1: NOT SUPPORTED
Result Codes:
OK n = 0
ERROR Otherwise

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&Kn Local Flow Control Selection
&K0: Disable flow control
&K1: Reserved
&K2: Reserved
&K3: Enable RTS/CTS (hardware) flow control (default)
&K4: Enable XON/XOFF flow control
Result Codes:
OK n = 0, 3, 4
ERROR Otherwise
&Mn Asynchronous Communications Mode
&M0: Asynchronous mode (default).
&M1: Reserved
&M2: Reserved
&M3: Reserved
&M4: Reserved
Result Codes:
OK n = 0
ERROR Otherwise
&Pn Pulse Dial Make-to-Break Ratio Selection
This Command is effective only for Japan.
&P0 39/61 make/break ratio, 10PPS
&P1 33/67 make/break ratio, 10PPS (default)
&P2 33/67 make/break ratio, 20PPS
Result Codes:
OK n = 0, 1, 2
ERROR Otherwise
&Qn Asynchronous Communications Mode
&Q0: Asynchronous Mode, buffered. Same as \N0.
&Q5: Error Control Mode, buffered (default). Same as \N3.
&Q6: Asynchronous Mode, buffered. Same as \N0.
&Q8: MNP error control mode. If an MNP error control protocol is not established, the
modem will fallback according to the current user setting in S36.
&Q9: V.42 or MNP error control mode. If neither error control protocol is established,
the modem will fallback according to the current user setting in S36.
Result Codes:
OK n = 0, 5, 6, 8, 9
ERROR Otherwise

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&Sn Data Set Ready (DSR) Option
This command selects DSR action.
&S0: DSR always ON (default).
&S1: DSR comes on when establishing a connection and goes off when the
connection ends.
Result Codes:
OK n = 0, 1
ERROR Otherwise
&Tn Self-Test Commands
This command allows the user to perform diagnostic tests on the modem. These tests can
help to isolate problems when experiencing periodic data loss or random errors.
&T0 Abort. Stops any test in progress.
&T1 Local analog loop. This test verifies modem operation, as well as the connection
between the modem and computer. Any data entered at the local DTE is modulated,
then demodulated, and returned to the local DTE. To work properly, the modem must
be off-line.
&T3 Local digital loopback test.
&T6 Remote digital loopback test. This test can verify the integrity of the local
modem, the communications link, and the remote modem. Any data entered at the
local DTE is sent to, and returned from, the remote modem. To work properly, the
modems must be on-line with error control disabled.
Result Codes:
OK n = 0
CONNECT n = 1, 3, 6
ERROR Otherwise
&V View Active Configuration and Stored Profile
This command is used to display the active profiles.
For example:
Option Selection AT Cmd
Comm Standard Bell B
CommandCharEcho Enabled E
Speaker Volume Medium L
Speaker Control OnUntilCarrier M
Result Codes Enabled Q
Dialer Type Tone T/P
ResultCode Form Text V
ExtendResultCode Enabled X
Dial Tone Detect Enabled X
Busy Tone Detect Enabled X
LSD Action Standard RS232 &C
DTR Action Standard RS232 &D
Press any key to continue; ESC to quit.
Option Selection AT Cmd
V22b Guard Tone Disabled &G
Flow Control Hardware &K
Error Control Mode V42, MNP, Buffer \N
Data Compression Enabled %C
AutoAnswerRing# 0 S0
AT Escape Char 43 S2
CarriageReturnChar 13 S3
Linefeed Char 10 S4

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Backspace Char 8 S5
Blind Dial Pause 2 sec S6
NoAnswer Timeout 50 sec S7
“ , “ Pause Time 2 sec S8
Press any key to continue; ESC to quit.
Option Selection AT Cmd
No Carrier Disc 2000 msec S10
DTMF Dial Speed 95 msec S11
Escape GuardTime 1000 msec S12
Data Calling Tone Disabled S35
Line Rate 33600 S37
DSVD mode Disabled -SSE
Stored Phone Numbers
&Z0=
&Z1=
&Z2=
&Z3=
OK
&Wn Store Current Configuration
This command stores certain command options and S-register values except S3, S4, and S5.
The ATZ command or a power-up reset of the modem restores this profile.
Result Codes:
OK n = 0
ERROR Otherwise
&Yn Select Stored Profile for Hard Reset
This command does not change the behavior of the modem but is included for compatibility
with applications that issue the &Y0 command
&Y0: Select stored profile 0 on power-up
&Y1: ERROR
Result Codes:
OK n = 0
ERROR Otherwise
&Zn=x Store Telephone Number
This command is used to store up to four dialing strings for later dialing. The format for the
command is &Zn = ”stored number” where n is the location 0—3 to which the number should
be written. The dial string may contain up to 40 characters. The ATDS = n command dials
using the string stored in location n.
Result Codes:
OK n = 0, 1, 2, 3
ERROR Otherwise
\An Select Maximum MNP Block Size
The modem will operate an MNP error corrected link using a maximum block size controlled
by the parameter supplied.
\A0: 64 characters.
\A1: 128 characters.
\A2: 192 characters.

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\A3: 256 characters (default).
Result Codes:
OK n = 0, 1, 2, 3
ERROR Otherwise
\Bn Transmit Break to Remote
In non-error-control mode, the modem will transmit a break signal to the remote modem with
a length in multiples of 100ms according to parameter specified. The command works in
conjunction with the \K command.
\B1 - \B9: Break length in 100ms units. (Default = 3.) (Non-error-control mode only.)
Result Codes:
OK If connected in data modem mode.
NO CARRIER If not connected or connected in fax modem mode.
\G Modem Port Flow Control
\G0: Modem process XON/XOFF flow control characters locally (default).
\G1: Modem passes XON/XOFF flow control characters.
Result Codes:
OK n = 0, 1
ERROR Otherwise
\J Bits/s Rate Adjusted
This command determines whether or not the negotiated connect speed of the modem forces
the adjustment of the speed of the DTE to the modem’s speed.
\J0: Buffer mode. Error control selected (or not) by \Nn command (default).
\J1: Force the max DCE rate to the DTE rate.
Result Codes:
OK n = 0 or 1
ERROR Otherwise
\Kn Break Control
Controls the response of the modem to a break received from the DTE or the remote modem
or the \B command. The response is different in three separate cases.
The first case is where the modem receives a break from the DTE when the modem is
operating in data transfer mode:
\K0: Enter on-line command mode, no break sent to the remote modem.
\K1: Clear data buffers and send break to remote modem.
\K2: Same as 0.
\K3: Send break to remote modem immediately.
\K4: Same as 0.
\K5: Send break to remote modem in sequence with transmitted data. (Default.)
The second case is where the modem is in the on-line command state (waiting for AT
commands) during a data connection, and the \B is received in order to send a break to the
remote modem:
\K0: Clear data buffers and send break to remote modem.
\K1: Clear data buffers and send break to remote modem. (Same as 0.)
\K2: Send break to remote modem immediately.

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\K3: Send break to remote modem immediately. (Same as 2.)
\K4: Send break to remote modem in sequence with data.
\K5: Send break to remote modem in sequence with data. (Same as 4.) (Default.)
The third case is where there a break is received from a remote modem during a connection:
\K0: Clear data buffers and send break to the DTE.
\K1: Clear data buffers and send break to the DTE. (Same as 0.)
\K2: Send a break immediately to DTE.
\K3: Send a break immediately to DTE. (Same as 2.)
\K4: Send a break in sequence with received data to DTE.
\K5: Send a break in sequence with received data to DTE. (Same as 4.) (Default.)
Result Codes:
OK n = 0,1, 2, 3, 4, 5
ERROR Otherwise
\Nn Error Control Mode Selection
This command determines the type of error control used by the modem when sending or
receiving data.
\N0: Buffer mode. No error control (same as &Q6).
\N1: Direct mode.
\N2: MNP* or disconnect mode. The modem attempts to connect using MNP 2¾4
error control procedures. If this fails, the modem disconnects. This is also known as
MNP reliable mode.
\N3: V.42, MNP, or buffer (default).The modem attempts to connect in V.42 error
control mode. If this fails, the modem attempts to connect in MNP mode. If this fails,
the modem connects in buffer mode and continues operation. This is also known as
V.42/MNP auto reliable mode (same as &Q5).
\N4: V.42 or disconnect. The modem attempts to connect in V.42 error control mode.
If this fails, the call will be disconnected.
\N5: V.42. MNP or buffer (same as \N3).
\N7: V.42. MNP or buffer (same as \N3).
Result Codes:
OK n = 0, 1, 2, 3, 4,5,7
ERROR Otherwise
\Q Local Flow Control Selection
\Q0: Disable flow control. Same as &K0.
\Q1: XON/XOFF software flow control. Same as &K4.
\Q2: CTS-only flow control. This is not supported and the response is ERROR.
\Q3: RTS/CTS to DTE (default). Same as &K3.
Result Codes:
OK n = 0, 1, 3
ERROR Otherwise

19 YML545
\Rn Ring indicator signal off after the telephone call is answered
(Compatibility command)
\R0: ring indicator signal is off after the telephone call is answered
Result Codes:
OK n = 0
ERROR Otherwise
\Tn Inactivity Timer
This command specifies the length of time (in minutes) that the modem will wait before
disconnecting when no data is sent or received. A setting of zero disables the timer.
Alternatively, this timer may be specified in register S30. This function is only applicable to
buffer mode.
\T0: Inactivity timer disabled (default).
Result Codes:
OK n = 0 – 255
ERROR Otherwise
\Vn Protocol Result Code
\V0: Disable protocol result code appended to DCE speed.
\V1: Enable protocol result code appended to DCE speed (default).
\V2: Same as \V1.
Result Codes:
OK n = 0, 1
ERROR Otherwise
\Xn XON/XOFF Pass Through
\X0: Modem process XON/XOFF flow control characters locally (default).
\X1 Modem passes XON/XOFF flow control characters.
Result Codes:
OK n = 0, 1
ERROR Otherwise
-Cn Data Calling Tone
Data Calling Tone is a tone of certain frequency and cadence as specified in V.25 which
allows remote Data/FAX/Voice discrimination. The frequency is 1300 Hz with a cadence of .5
s on and 2 s off.
-C0: Disabled (default).
-C1: Enabled.
Result Codes:
OK n = 0, 1
ERROR Otherwise
-V90 = <n>
Command to enable/disable V.90 and change downstream rate
-V90=0 will disable V.90
-V90=1 will enable V.90 Auto Rate (default value)