Usr USR5686G-PRO User Manual

USR® Courier® Lite Business Modem

User Guide

USR5686G-PRO

R24.0802.00

Rev 1.0 06/2018

5686G-PRO User Guide

Contents

INTRODUCTION ................................................................................................................ 3

INSTALLATION .................................................................................................................. 4

Modem Installation ......................................................................................................... 4

Modem Upgrade ............................................................................................................. 7

CONFIGURATION ............................................................................................................. 11

Configuring DIP Switches .............................................................................................. 11

Accessing and Configuring the Modem Remotely .............................................................. 12

Dial Security ................................................................................................................ 18

Testing the Connection ................................................................................................. 28

REFERENCE .................................................................................................................... 32

S-Registers ................................................................................................................. 32

Alphabetic Command Summary ..................................................................................... 46

Flow Control Template .................................................................................................. 66

Result Code Meanings and Sets ..................................................................................... 71

Technical Information ................................................................................................... 75

ASCII Chart ................................................................................................................. 80

Fax Information for Programmers .................................................................................. 81

Viewing LEDs ............................................................................................................... 84

WARRANTY ..................................................................................................................... 85

REGULATORY .................................................................................................................. 89

COPYRIGHT .................................................................................................................... 94

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INTRODUCTION

Thank you for purchasing the USRobotics Courier Lite 56K Business Modem!

The USR® Courier® Lite 56K Business Modem with V.Everything® technology offers the perfect solution for both Out -of-Band Management of networks or Point-of-Sale applications. Many modems claim reliability, but few match the real-world performance of Courier modems. Even fewer offer the multitude of advanced business features found on this modem including Carrier Loss Redial and Dialback Security. Remote access capabilities let you remotely configure or troubleshoot modems in Remote Management and other M2M (Machine -to-Machine) applications. When failure is not an option, you need the world-class capabilities that only come from the top of the USR product line.

Product Features

V. Everything Technology

The modem supports all key ITU analog communications protocols and many proprietary ones to provide you with ultimate compatibility.

Dial and Dialback Security

The modem includes a robust mechanism for providing dial and dialback security for your network. See the “Dial Security” part of the Configuration section of this guide.

Remote Manageability

The modem can be remotely configured and monitored for the convenience of your local office. See the “Accessing and Configuring Remotely” part of the Configuration section of this guide.

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INSTALLATION

Modem Installation

Physical Features

Top

1. Power Switch

2. LEDs

Back

5686G-PRO User Guide

Side

3. Line to wall jack

4. Line to telephone

5. DIP switches

6. Serial port

7. Power input

8. Volume dial

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Step One: Prepare for Installation

5686G-PRO User Guide

1. Uninstall all other modems

*

that are installed on your computer. For instructions, refer to the

documentation for your previous modem or your computer’s operating system.

2. Unplug all data, telephone, and power cords connected to your previous modem(s).

3. Shut down your computer and power it off.

4. Locate the serial port on the back of your computer. To find the serial port, look for a port

labeled COM, MODEM, RS-232, , or SERIAL. Do not use the AUX, GAME, LPT, or PARALLEL

ports.

Note: If your computer does not have a serial port, use a USB-to-serial cable that is compatible with

your computer’s operating system.

*If the previous modem was a USRobotics Courier 56K Business Modem , do not uninstall it. The

Courier Lite 56K Business Modem uses the same driver a s the Courier 56K Business Modem.

Step Two: Connect the Modem to the Computer

1. Connect one end of the serial modem cable to modem and the other end to your computer’s

serial port.

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Step Three: Connect the Modem to an Analog Telephone Line

Caution: The Courier Lite 56K Business Modem must be plugged in to an analog phone line only.

Plugging your Courier Lite 56K Business Modem in to a digital phone line may damage the modem. Most office phones are wired through digital lines. Be sure you know what type of line you have.

1. Plug one end of the telephone cord into the jack on the modem.

2. Plug the other end into an analog telephone wall jack.

3. To connect a telephone through the modem, plug the telephone’s cord into the

modem’s jack.

Step Four: Power Up the Modem

1. Plug the power adapter into the power jack on the modem and the other end into an

electrical outlet.

2. Turn on the modem by switching the power switch on the top of the modem to ON.

The CS LED should light.

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If the CS LED does not light or if other LEDs light, make sure that only DIP switches (located on the back of the modem) 3, 5, and 8 are in the ON (down) position.

3. Turn on your computer.

Step Five: Install the Modem Drivers

Windows operating systems should automatically install the modem driver. If the driver does not install automatically, or for other operating systems, visit http://www.usr.com/support.

Uninstallation

Consult your computer’s operating system documentation for uninstallation procedures.

Modem Upgrade

Upgrading your Modem

This section contains information about:

 Checking your modem’s software version  Getting new operating software  Getting the Flash Loader application  Use the Flash Loader application to send the new software to your modem  If the Flash Loader doesn’t find your modem  If your modem doesn’t respond after flashing  Remote flash

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ATI7

USRobotics Courier Lite Configuration Profile...

Product type

US/Canada External

Product ID

00568607

Options

V32bis,V.80,V.34+,V.90,V.92

Fax Options

Class 1,Class 2.0

Clock Freq

92.0Mhz

Flash ROM

256k

Ram

96k

Supervisor date

May 2 2018

DSP date

May 2 2018

Supervisor rev

V1.0.0

DSP rev

0F

DAA rev

3

Serial Number

xxxxxxxxxxxx

OK

Checking Your Modem’s Software Version

Issuing the ATI7 command produces the following information to appear on your terminal screen.

Check the Supervisor and Digital Signal Processor (DSP) dates found in the screen display. These dates will determine which version of the software your modem is using.

Getting New Operating Software

To get the newest version of the Courier Lite 56K Business Modem ’s operating software, go to the customer support web site at http://www.usr.com/support.

Getting the Flash Loader Application

To flash new firmware into the Courier Lite 56K Business Modem , you must run the USRobotics Flash Loader application on your computer.

To get the newest version of the Flash Loader application, go to the customer support web site at http://www.usr.com/support.

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Use the Flash Loader Application to Send the New Software to Your Modem

Run the Flash Loader application.

Navigate to the new software file.

After you choose the software file that you want to send, the Flash Loader will search your computer’s COM ports for the Courier Lite 56K Business Modem .

Note: There must be no other active modems on any of your computer ’s COM ports.

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Once the Flash Loader selects the COM port, it will send the file to the modem.

If the Flash Loader Doesn’t Find Your Modem

If the Flash Loader doesn’t find your modem during the flash process :

 Check that your computer has no other active modems on any of its COM ports. Don’t forget to

disable any internal modems in your computer.

 Manually verify that the Courier Lite 56K Business Modem is active by using a serial terminal

application. (e.g. PuTTY, Tera Term, RealTerm, etc.) Select the COM port of the Courier Lite 56K Business Modem. Type AT and Enter. The modem should respon d OK.

If the modem doesn’t respond OK:

A. Check that you’re using the correct COM port that your computer has assigned to the Courier

Lite 56K Business Modem.

B. Check that the Courier Lite 56K Business Modem power is ON. C. Check that the serial cable connecting the computer’s serial port to the Courier Lite 56K

Business Modem is wired with all the RS232 control signals. (i.e. DTR, DSR, CTS, RTS)

 Contact USR Technical Support.

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To do this

Set DIP Switch

To this setting

Set DTR to Normal

1

OFF (Default)

Ignore DTR

1

ON

Set verbal result code display

2

OFF (Default)

Set numeric result code display

2

ON

Disable result codes

3

OFF

Enable result codes

3

ON (Default)

If Your Modem Doesn’t Respond After Flashing

If your modem doesn’t respond after the flash process, the new software file may be corrupt. Try downloading it again from the USR support website. Then send that file to the Courier Lite 56K Business Modem using the Flash Loader.

If your modem still doesn’t respond, contact USR Technical Support.

Remote Flash

Flashing software into a remote Courier Lite 56K Business Modem is not supported.

CONFIGURATION

Configuring DIP Switches

Locating DIP Switches

On the Courier Lite 56K Business Modem, the DIP switches are on the back of the unit. The default setting is DIP switches 3, 5, and 8 are ON (in the down position).

Using DIP Switches to Configure your Courier Lite 56K Business Modem

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To do this

Set DIP Switch

To this setting

Enable the echo in offline commands

4

OFF (Default)

Disable the echo in offline commands

4

ON

Enable auto answer

5

OFF

Disable auto answer

5

ON (Default)

Normal Carrier Detect

6

OFF (Default)

Carrier Detect always on

6

ON

Load Y0-Y4 configuration that is stored in non -volatile memory (NVRAM)

7

OFF (Default) Load the &F0 configuration from read-only memory (ROM)

7

ON

Disable AT commands

8

OFF

Enable AT commands

8

ON (Default)

Local

The device that is directly connected to the com puter you are using.

Remote

The device at the other end of a telephone connection.

Host

The Courier Lite 56K Business Modem that will be accessed and controlled by other devices.

Guest

The device that will access and control the host Courier Lite 56K Business Modem.

Accessing and Configuring the Modem Remotely

This section contains information about:

 Setting Up Remote Access  Accessing The Host  Quitting a Remote Access Session

Overview

You can set up the Courier Lite 56K Business Modem so other devices can view or change its configuration remotely.

You should be familiar with these terms before you continue:

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To allow guest users to

Use this command to assign a remote-access password

View the Courier Lite 56K Business Modem’s configuration.

AT%P0=password

View and change the Courier Lite 56K Business Modem’s configuration.

AT%P1=password

Setting Up Remote Access

At the Host Courier Lite 56K Business Modem

1. Prepare to send AT commands by putting your communications software in Terminal Mode.

2. Enable remote access.

Set Register S41 for a value of 1 or greater. S41 sets the number of login attempts available to the remote user. A setting of zero allows no login attempts disabling remote access.

Example: Sending ATS41=1&W allows for 1 login attempt by a remote user.

3. Set one or two remote -access passwords.

You can set two passwords to allow different levels of access to each Courier Lite 56K Business Modem.

Example: Sending AT%P1= wombat will allow a remote user to log in with the password "wombat." The user can view and change the Courier Lite 56K Business Modem’s configuration.

Note: Remote-access passwords can be up to eight alphanumeric characters long, and are not case sensitive.

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For your modem to

Command

Display a view-only password

AT%P0?

Display a view-and-change password

AT%P1?

Erase a view-only password

AT%P0=

Erase a view-and-change password

AT%P1=

Disable remote access entirely

ATS41=0

Other Remote-Access Commands

The table below is a list of remote -access configuration commands.

Example: Sending AT%P1= will erase the view and change password.

WARNING: If you erase the %P1 password without disabling remote access (using ATS41=0), anyone

could access the Courier Lite 56K Business Modem and change its configuration.

Accessing The Host at the Guest Device

The guest device requires no configuration to access the host. Follow these steps:

1. Be sure that the host device has enabled remote access and is set to auto -answer (ATS0=1).

Know the password, if you will need one.

2. Call the host device (although it doesn’t matter which device originates the call).

3. After a connection is established, do this:

Pause 4 seconds.

Type 4 tildes: ~~~~

Pause 4 seconds.

Note: The administrator of the host device can change the remote -access character using SRegister 42, and the pause duration using S-Register 43. Refer to the S-Registers section for more information.

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If you have this access privilege

You can use

View-only

Any of the inquiry (ATI) commands

View and Configure

Any of the Courier Lite 56K Business Modem commands, except those that cannot be used while online (for example, ATD or ATA). You can also use remote configuration commands. See the next section for examples.

4. You should see a display similar to this:

U.S. Robotics Courier 56K Business Remote Access Session Serial Number 000000A000000001

Password (Ctrl-C to cancel)?

There is a three minute time limit for entering the password. If the num ber of unsuccessful login attempts exceeds the set limit, the host device returns online and refuses any further login attempts during the remainder of the connection.

When the host accepts the password, the following message and prompt will appear on your screen:

Remote Access granted Remote->

Note: You may not be prompted for a password. If you aren’t, password security is not active. The following prompt appears on your screen after you type the four tildes:

5686G-PRO User Guide

Remote Access granted (query only) Remote->

Note: During a remote-access session, the maximum number of characters between carriage returns is 40.

Viewing and Changing the Host’s Configuration

Once you've gained guest access to a host, you can communicate with the host just as if you were entering commands from its attached computer.

Depending on your access privileges, you can use the regular set of Courier Lite 56K Business Modem AT commands.

CAUTION: Be careful not to send ATZ or ATZ! or you will lose the connection!

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To change the host Courier 56K Business Modem’s serial port rate to

Command

To change the host Courier 56K

Business Modem’s serial port rate

to

Command

110 bps

AT%B0

19200 bps

AT%B7

300 bps

AT%B1

38400 bps

AT%B8

600 bps

AT%B2

57600 bps

AT%B9

1200 bps

AT%B3

76800 bps

AT%B10

2400 bps

AT%B4

115200 bps

AT%B11

4800 bps

AT%B5

230400 bps

AT%B12

9600 bps

AT%B6

To change the data format to

Command

No Parity (8 data bits)

AT%F0

Mark parity (7 data bits)

AT%F1

Odd Parity (7 data bits)

AT%F2

Even parity (7 data bits)

AT%F3

Remote Configuration Commands

There are special commands that can be used only during a remote -access session.

You can change the host Courier 56K Business Modem’s serial port rate by using

the AT%Bn command.

Example: Sending AT%B6 will change the Courier 56K Business Modem’s serial port rate to 9600 bps.

You can use the AT%Fn command to control the data format.

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For your modem to

Command

Defer configuration changes to when the call ends.

AT%C0(Default)

Restore the original configuration. Use this command to cancel any changes made during remote access and restore the original configuration.

AT%C1

Force configuration changes. Use this command to make configuration changes take effect immediately. We do not recommend forcing changes unless it is absolutely necessary because an unreliable connection, or even a loss of connection, may result.

AT%C2

To end the remote-access session

Command

And keep the connection.

ATO

And end the connection.

ATH

End the connection, and reset the host modem.

ATZ

You can use the AT%Cn command to control whether and when to apply changes to the configuration.

Example: Sending AT%C1 will cancel any changes made to the modem during a remote access session and restore it to the original configuration.

Note: Even though, by default (%C0), the changes you make do not take effect until the next connection, the new configuration is reflected immediately in inquiry responses (ATIn). Commands that have been written to NVRAM (using &W) and forced configuration changes (%C2) will not be restored to their previous settings when you send the host AT%C1.

After you make changes to the host’s configuration, the remote- access prompt changes from Remote-> to Remote+>.

If you restore the original configuration using the AT%C1 command, the first prompt is restored, assuring you the original configuration is intact.

Quitting A Remote Access Session

If you want to quit the remote access login before you have entered the password, return online by pressing <Ctrl>C or typing ATO.

After you’ve entered the password, you can quit by sending one of these commands:

Note: Before you disconnect, issue the ATI5 command to the remote modem and check its S41 setting. Make sure S41 is set for a value of 1 or greater. If S41 is set to 0, when you disconnect

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Local

The device that is directly connected to the computer you are using.

Remote

The device at the other end of a telephone connection.

Host

The Courier Lite 56K Business Modem that will be accessed and controlled by other devices.

Guest

The device that will access and control the host Courier Lite 56K Business Modem.

you will not be able to access the remote modem again. To prevent this send ATS41=1&W before you disconnect.

Dial Security

This section contains information about:

 Setting up Dial Security  Maintaining Security Accounts  What The Guest User Needs To Do  Configuring Dial Security Remotely  DTMF Security

Overview

Dial Security is designed to protect networks and data centers from unauthorized access.

You should be familiar with these terms before you continue:

You can configure up to 5 accounts: one administrative account for you and four accounts for guest users. The account profiles are stored in the host Courier Lite 56K Business Modem ’s nonvolatile random access memory (NVRAM).

There are two forms of Dial Security; each will be explained later in this section :

 Autopass  Password Prompting

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Setting up Dial Security

Here is a summary of the steps for setting up Dial Security:

1. Set up an account for yourself

2. Identify your account as the Administrative Acco unt

3. Set up guest-user accounts

4. Enable local (host) security

5. Choose a Dial Security method

6. Enable Dial Security

7. Activate the Dial Security settings

1. Set up an account for yourself

Use any of the 5 available accounts (numbered 0-4) for your account. Use the AT%An command to set up user accounts.

Note: The AT%An command is automatically written to NVRAM. It does not require you to send &W.

WARNING: Do not insert spaces between commas or between fields and commas. Spaces will invalidate the command.

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To make the host Courier Lite 56K Business Modem

Command

Example

Hang up and then dial back a guest device at a specified number.

Expect a pause of approximately 1.5 minutes before the modem dials back. You cannot alter the duration of the pause.

AT%A0=password,y,y,n,1area code and phone number

AT%A0=wombat,y,y,n,1,8475555555

Prompt you to enter a number at which to dial back a device, and then have the Courier Lite 56K Business Modem dial back the device at that number

AT%A0=password,y,y,y,

AT%A0=wombat,y,y,y,

Disable dialback

AT%A0=password,y,n,,

AT%A0=wombat,y,n,,

Dialback options

You can set the Courier Lite 56K Business Modem to automatically dial back a certain number after a guest modem dials in.

Note: Count your commas. There should always be at least four commas in the %A command. Do not insert spaces between commas or between fields and commas. Spaces will invalidate the command.

Note: To enable Dialback, you must enable Dial Security with Prompting. See step 6.

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For your modem to

Command

Example

Identify your account as the Administrative Account

AT%L

AT%L=PW0 This example sets account 0 as the Administrative Account.

For your modem to

Command

Protect the administrative password (local security enabled)

ATS53.2=1

2. Identify your account as the Administrative Account

Once you set the administrative password, you cannot view or modify the guest account profiles unless you enter the correct administrative password.

WARNING: Be sure to remember your administrative password. If you enable Dial Security and then forget your administrative password, you will be locked out of the Courier Lite 56K Business Modem’s dial security features. You will need to restore the factory defaults by setting DIP switch 7 ON. This will erase ALL passwords and you will have to reconfigure all your accounts.

3. Set up guest-user accounts

Use the AT%An command to set up guest-user accounts in the same way you set up your administrative account. You can set up four guest accounts. Refer to the figure in step 1 regarding information about formatting the AT%An command.

After you have enabled the guest accounts, make sure the guest users know their passwords and the log-in procedure.

Modifying accounts

After you have set up an account, you can modify each field independently. If a field is to remain unchanged from its original setting, just insert a com ma as shown:

AT%A1=,,,Y,

The command above allows the guest user to supply a dialback number that is different from the one stored in the original account record.

4. Enable Local Security.

WARNING: If you do not enable Local Security, the Dial Security settings will not be protected

and other users will be able to change or erase them.

Note: You must use the &W command to save the settings in NVRAM. If you don’t, the next time you reset or power off the Courier Lite 56K Business Modem , Dial Security will be disabled.

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5. Decide which Dial Security option to use

You can choose from the two types of Dial Security: Autopass and Password Prompting.

Autopass

Autopass is the default form of password protection. Autopass automates the process of logging in to the host modem, but it requires the guest and host devices to be U.S. Robotics Courier modems.

When a guest device attempts an Autopass connection, the guest includes the password in its V.42 error-control request. The host modem checks all the enabled passwords in its security accounts for a match.

Password Prompting

Password Prompting allows connections with any guest device, as long as the guest user knows the correct password.

When the host has Password Prompting enabled, it asks guest users for a password. The host modem checks the received password against each of its act ive Security accounts.

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When using Autopass Prompting

When using Password Prompting

Both the host and guest devices are made by U.S. Robotics and have Dial Security enabled.

Guest devices don’t have to support U.S.

Robotics Dial Security.

The connection between the Courier Lite 56K Business Modem or modems is under V.42 error control.

(Refer to the Alphabetic Command Summary section for information about using AT&M4 or AT&M5.)

V.42 error-control connections aren’t required.

If the guest includes an invalid password, the host sends an INVALID PASSWORD message and hangs up.

If the guest sends an invalid password, the host prompts twice more before disconnecting.

If the guest does not send a password after 60 seconds, the host disconnects.

If the guest includes a valid password, the host permits a secure connection.

The host will still always respond to a correct Autopass attempt.

If the guest did not enable Dial Security, the host will not accept the call unless prompting is enabled on the host Courier Lite 56K Business Modem.

The table below is a comparison between Autopass and Password prompting.

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For your modem to enable

Command

Autopass Dial Security

ATS53.0=1

Dial Security with Password Prompting (this also enables Autopass)

ATS53.0=1.1=1

Dialback Security, enable Password Prompting and enable Dialback in each guest account

AT%An=password,y,y,y,phone number where n is the account number. See the figure in previous section, Setting Up Dial Security for more information.

6. Enable Dial Security

WARNING: Before you enable Dial Security, you must set up an administrative account and

password. See Steps 1 & 2.

Example: Issuing AT%A3=wombat,y,y,y,5551234 to your modem will enable Password Prompting and Dialback for account 3, which has the password "wombat."

Note: You must use the &W command to save the settings for Enabling Autopass Dial Security

and Dial Security with Password Prompting. If you don’t, the next time you reset or power off the

Courier Lite 56K Business Modem, Dial Security will be disabled.

If you need a reference when setting these commands, you can use the ATI10 command. Refer to the Alphabetic Command Summary section for more information about the ATI10 command.

7. Send ATZ or ATZ! to activate the Dial Security settings.

Note: Make sure that DIP switch 7 is OFF, so the modem loads the settings stored in NVRAM. If

DIP switch 7 is ON, the settings in ROM (&F0) are loaded, disabling dial security. You can retrieve the dial security settings by setting DIP switch 7 OFF and resetting the Courier Lite 56K Business Modem using ATZ or by toggling the power of the modem.

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For your modem to

Command

Access accounts by disabling local security AT%S=administrative password

View account information, once access has been granted. Remote users may only use this command during remote access sessions if local-access security is disabled.

ATI10 Erase local-access password

AT%E=1

Erase Autopass password

AT%E=2

Erase passwords in accounts 0-4

AT%E=3

Erase phone numbers in accounts 0-4

AT%E=4

Disable Account, Dialback, and New Number fields in accounts 0-4.

AT%E=5

Edit or overwrite an individual account or an individual account field

AT%An=

where n is the account number.

See the image in the Setting Up Dial

Security section for more information.

Maintaining Security Accounts

Once the administrative password is set and Dial Security is enabled, the administrator is the on ly one who can access account information.

You can use the AT%S= and AT%E= commands to change and modify account information.

Example: Sending AT%E=3 erases passwords for accounts 0-4.

Note: When using the AT%S= command, the device echoes the administrative password, which is

case-sensitive. Courier 56K Business Modems will accept an invalid password entry, but will lock out users from the security commands. For example, if the password is Green, but you enter GREEN, an OK is displayed. However, if you try to type a security command (for example, ATI10 to view accounts), an [ACCESS DENIED] message is displayed.

Remote Configuration

Dial Security accounts may be configured remotely. (Refer to Configuring Dial Security Remotely at the end of this section .)

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For your modem to

Command

Assign the password as your Autopass password.

AT%V=PWn where n is the number of the account you set up.

For your modem to

Command

Enable Dial Security

ATS53.0=1

What The Guest User Needs To Do

When guest users want to call in to the host (assuming you have enabled Dial Security by entering ATS53.0=1),

 They must know the password.  If you have enabled Dialback, they must set their device to auto -answer.

1. If the host has security enabled, get a password from the host’s administrator. The password is

case-sensitive, so be sure to copy it correctly.

If the host has prompting enabled and the host operator enables Dialback for your account, skip to Step 3.

2. For guest users with Courier Lite 56K Business Modem s (or I-Modems) only:

a) Create a security account using the password the host’s administrator asked you to use. (See

Setting Up Dial Security, earlier in this section for instructions.)

b) You need to assign the password as your Autopass password.

Example: Sending AT%V=PW3 will assign the password as an Autopass password for account 3.

c) Check to see that you set your Autopass password correctly by using the ATI10 command.

Your Autopass password appears beside AUTOPASS PASSWORD if you have done all the steps correctly.

d) Once the Autopass password is set, enable your Courier Lite 56K Business Modem’s Dial Security.

CAUTION: If you do not follow an S-Register setting with &W, the setting will be retained only until the next reset or power off.

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For your modem to

Command

To answer the Dialback call

ATS0=1

For your modem to

Command

Disable Auto Answer

ATS0=0

3. If Dialback is enabled at the host Courier Lite 56K Business Modem ’s site, set your modem to

answer the host Courier Lite 56K Business Modem when it dials back.

4. Call the host.

5. After the call ends you can disable Auto Answer.

Configuring Dial Security Remotely

The host administrator can configure the host’s security settings remotely.

Note: At the host device, you must have previously enabled remote access and assigned a remote access password that allows view-and-change privileges (Refer to the Accessing and Configuring the

Modem Remotely section in this guide). You may want to use your administrative password as your

remote-access password.

Dialing In From the Remote Site

1. From the remote site, connect to the host using Dial Security. Once a connection is made,

follow the instructions for beginning a remote -access session as described in the Accessing and Configuring the Courier Lite 56K Business Modem Remotely.

2. When remote access has been granted, use the AT%S= command to access the Dial Security

accounts. Refer to the Maintaining Security Accounts part in this section .

To view the security account information use ATI10.

3. Make any configuration changes and execute them immediately by entering AT%C2.

4. To end the remote session and reactivate Dial Security on the host, reset the host device by

issuing ATZ.

WARNING: If you do not use the ATZ command to end a remote-access session, Dial Security will remain disabled at the host, and anyone dialing in to the host for remote access will have access to the ATI10 screen and all Dial Security accounts.

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DTMF Security

DTMF (Dual Tone Multi -Frequency) Security requires a modem to go off hook when it receives a call but keep silent until it receives the valid DTMF password. After the modem receives the valid password, it will begin training. If the DTMF password is invalid, the modem will go on hook, and the DTE will never know there had been a cal l coming.

The DTMF security status and password are shown in the ATI10 screen.

DTMF security is enabled by setting the S53 bit 3, e.g. S53=8 or S53.3=1.

Using the %D command sets the DTMF security password (AT%D=PWn, n=0--4). Make sure to disable that account so no one can use the DTMF password as the Dial Security account. For example, to set local modem DTMF security password, you may use following command: AT%A0=123456,N,,, then AT%D=PW0. You can change that security account later, if you like.

The DTMF password can be the combination of 0123456789*ABCD; the # is used as the password end sign. The maximum length of the DTMF password is eight characters.

The remote modem dial string should look like this: ATDT2625000@123456#. In this example, “123456” is the DTMF security password.

Testing the Connection

This section contains information about:

 Testing the Courier Lite 56K Business Modem using AT&Tn

Overview

Your modem can perform local analog loopback and local digital loopback tests. You can use these tests to check the operations of the modem’s transmitter and receiver, or to locate a problem with a remote device or a telephone line.

Testing is done by sending the AT&Tn command or by setting Register S16. Only one test can be performed at a given time. If you send a test command while the modem is in test mode, you will receive an ERROR message.

All loopback testing conforms to ITU-T Recommendation V.54.

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For your modem to

Command

End test

AT&T0

Local analog loopback

AT&T1

Local digital loopback

AT&T3

Local analog loopback with test pattern

AT&T8

Testing the Courier Lite 56K Business Modem using AT&Tn

To perform local analog loopback and local digital loopback testing, use the AT&Tn command. You can type in your own data during testing or use the modem's internal test pattern and error detector. See the following sections for more detailed information about each AT&Tn command.

Example: Sending AT&T3 to your Courier Lite 56K Business Modem will allow a remote user to test their connection to your modem.

Note: Disable error control (using the &M0 command, refer to the Alphabetic Command Summary ) before testing. If the modem is detecting errors and retransmitting the affected data, your results will be invalid.

Analog Loopback Testing

Local loopback testing checks the operation of the Courier Lite 56K Business Modem 's transmitter and receiver.

Using AT&T1

1. Send AT&M0&N3S14.0=0 to prepare the modem for testing.

This command disables error control, fixes the connection rate at 2400 bps, and makes the modem return to command mode when you type +++.

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2. Send AT&T1 to the modem so it enters analog loopback mode. The CD status light will

illuminate.

3. Type any recognizable data. It will be looped back by your modem's transmitter for

verification on your screen.

4. When the test is completed, send +++ and then AT&T0 to end the test.

Alternatively, you can end the test by sending ATH, or ATZ. Be careful, though, because ATZ resets the modem in addition to ending the test.

In either case, the modem responds with OK. If the modem sends an ERROR message, you have issued an invalid command.

5. Send AT&M4, unless you used a reset command (ATZ).

Note: If the Courier Lite 56K Business Modem is in online command mode, still connected to a remote modem, and you send AT&T1 or AT&T8, it drops the call, enters analog loopback mode, sends a CONNECT result, and waits for loopback characters.

Stopping a Test (AT&T0, ATS18)

To stop a test, send AT&T0 to the modem, or set Register S18 to a specified number of seconds (for example, ATS18=10). When the 10 seconds are up, the modem will stop the test automatically and return to Command Mode. Send ATH to the modem to hang up, or send ATZ to hang up and reset the modem to its defaults.

Note: If you use the S18 test timer, but in the process of testing you issue an ATZ command, S18 resets to zero and the timer is disabled. You cannot store a value for S18 in NVRAM; its power-on and reset default is always zero.

Using AT&T8

This analog loopback option causes the Courier Lite 56K Business Modem to send an internal test pattern to its transmitter and loop it back to the receiver. An internal error detector counts any errors and, when the test is ended, sends the number of errors or 000 (no errors) to the screen.

Since you don't type anything during this test and the Courier Lite 56K Business Modem does not send anything to the screen, this option verifies only the Courier Lite 56K Business Modem. If there are no errors but your problem continues, it may be at the computer interface.

1. Send AT&M0&N3S14.0=0 to the modem to prepare for testing.

This command disables error control, fixes the connection rate at 2400 bps, and makes the Courier Lite 56K Business Modem return to command mode when you type +++.

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The code

Indicates

000

No errors were found

255

255 or more errors

An ERROR message indicates that you issued an invalid command.

2. Send AT&T8 to begin the test.

The Courier Lite 56K Business Modem enters analog loopback (AL) mode, and sends a CONNECT message. The CD status light will illuminate. The modem then sends its internal test pattern to the transmitter, and loops the pattern back to the receiver. You will not see any data on your screen.

3. Send the escape code, +++, and then AT&T0 to end the test.

Alternatively, you can end the test with the S18 test timer or by sending ATH or ATZ. Be careful, because ATZ resets the modem in addition to ending the test.

In any case, the Courier Lite 56K Business Modem hangs up and returns a three-digit code, followed by OK.

4. Send AT&M4, unless you used a reset command (ATZ or ATZ!).

Digital Loopback Testing (AT&T3)

This test can help you locate a problem with a remote device or with the telephone line. The figure below shows the data flow during Digital Loopback (DL) testing.

1. Send the command AT&M0&N3S14.0=0 to the modem to prepare for testing.

This command disables error control, fixes the connection rate at 2400 bps, and makes the Courier return to command mode when you type +++.

2. Establish a connection with the remote device.

3. Send the Courier Lite 56K Business Modem the escape code, +++, to bring it back to Command

mode.

4. Send AT&T3 to the modem to enter Digital Loopback mode.

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5. Have the remote user type a short message. It will be looped back by your Courier Lite 56K

Business Modem's transmitter for verification on the remote user's screen. You will not see the message or any other data.

6. When the remote user has completed the test, send the escape code, +++, and then AT&T0 to

end the test.

Alternatively, you can end the test with the S18 test timer or by sending ATH or ATZ. Be careful, because ATZ resets the modem in addition to ending the test.

In any case, the Courier Lite 56K Business Modem responds OK. If the modem sends an ERROR message, you have issued an invalid command.

7. Send AT&M4, unless you used ATZ.

REFERENCE

S-Registers

Understanding Bit -Mapped S-Registers

A bit-mapped S-Register uses one number to describe a collection of settings. Bit -mapping allows us to pack a lot of information in a small space.

Bit-mapped registers are in the form of Sr.b=n, where r is the bit -mapped register; .b is the bit; n is 0 (off) or 1 (on).

The modem displays the value of an S-Register, as a decimal value between 0 and 255. The modem, however, understands the decimal value as a collection of binary digits (bits).

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Bit

Value

7

128

6

64 5 32 4 16 3 8 2 4 1 2 0 1

0 1 0 0 1 1 1

1

0

+ 64

+ 0

+ 8

+ 4

+ 2

+ 1

=

79

How bits are mapped to decimal values

Bits can be mapped into decimal values. Each bit can be either on (1) or off (0). Eight bits create 256 unique combinations of 1s and 0s. Each of the eight bits can be assigned a number corresponding to its position:

b b b b b b b b 7 6 5 4 3 2 1 0

Also, each bit can be assigned a value corresponding to its number (e.g., the value equals 2 to the power of the bit):

Converting Bits to Decimal Values

Starting with a string of eight bits, assign each "1" bit a value based on its position. Add the values to come up with the final decimal value.

Here’s an example of how bits are converted to decimal values:

01001111

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Register

Default

Function

S0

0

Sets the number of rings on which to answer in Auto Answer mode. S0=0 disables Auto Answer. S0=1 enables Auto Answer and the Courier Lite 56K Business Modem answers on the first ring.

S1 0 Counts and stores the number of rings from an incoming call.

S2

43

Stores the ASCII decimal code for the escape code character. Default character is “+”. A value of 128-255 disables the escape code.

Converting Decimal Values to Bits

Convert decimal values to bits by finding the largest decimal equivalent that is less than the decimal value. Subtract the decimal equivalent and mark the equivalent bit "1." Continue until the decimal value is zero. See the example below.

113 113 - 64 = 49 01 49 -32 = 17 011 17 -16 = 1 0111 1 -1 = 0 01110001

Setting Bit-Mapped S-Registers

You can set bit-mapped S-Registers using either bits or decimal values. While it may be simpler for you to set the bits individually, your modem displays the S -Register settings in decimal form.

Using Bits

Turning individual bits on and off is the more direct way to set bit -mapped S-Registers. To do this, specify the S-Register that you want to set and then indicate which bits you want to turn on (1) or off (0).

Example: ATS13.0=1.4=1.5=1, turns bits 0, 4, and 5 on for S-Register 13.

Using Decimal Values

An alternative way to set bit-mapped S-Registers is by adding the decimal values of the bits and entering the total.

This example, ATS13=49, sets the same value as the one in Using Bits above.

A complete list of S-Registers

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Register

Default

Function

S3

13

Stores the ASCII decimal code for the Carriage Return character. Valid range is 0-127.

S4

10

Stores the ASCII decimal code for the Line Feed character. Valid range is 0 -127.

S5

8

Stores the ASCII decimal code for the Backspace character. A value of 128 -255 disables the Backspace key's delete function.

S6

0

Set the number of seconds the Courier Lite 56K Business Modem waits for a dial tone.

S7

60

Sets the number of seconds the Courier Lite 56K Business Modem waits for a carrier. May be set for much longer duration if, for example, the Courier Lite 56K Business Modem is originating an international connection.

S8

2

Sets the duration, in seconds, for the pause (,) option in the Dial command and the pause between command reexecutions (> and A> commands).

S9

6

Sets the required duration, in tenths of a second, of the remote device's carrier signal before recognition by the Courier Lite 56K Business Modem .

S10

14

Sets the duration, in tenths of a second, that the Courier Lite 56K Business Modem waits after loss of carrier before hanging up. This guard time allows the Courier Lite 56K Business Modem to distinguish between a line hit, or other disturbance that momentarily breaks the connection, and a true disconnect (hanging up) by the remote device.

S11

70

Sets the duration and spacing, in milliseconds, of dialed tones.

S12

50

Sets the duration, in fiftieths of a second, of the guard time for the escape code (+++) sequence.

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Register

Default

Function

S13

0

Bit-mapped register. See the beginning of this section for information about setting bit -mapped registers.

Bit

Value

Result

0 1 Reset when DTR drops.

1

2

Reverse normal Auto Answer operation: On incoming RING, enter Originate Mode and look for an answer tone.

2 4 Add 250 ms pause before NO CARRIER display.

3

8

On DTR signal, autodial the number stored in NVRAM at position 0.

4

16

At power-on/reset, autodial number stored in NVRAM at position 0.

5

32

Reserved

6

64

Disable MNP Level 3 (used for testing Level 2).

7

128

Hardware reset (works like powering off and then on).

S14

0

Bit-mapped register ( See the beginning of this section for information about setting bit -mapped registers).

Bit

Value

Result

0 1 Disconnect on escape code.

1 2 Reserved

2 4 Reserved

3 8 Reserved

4

16

Reserved

5

32

Reserved

6

64

Reserved

7

128

Reserved

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Register

Default

Function

S15

0

Bit-mapped register. ( See the beginning of this section for information about setting bit -mapped registers).

Bit

Value

Result

0 1 Reserved

1 2 Reserved

2 4 Reserved

3 8 Reserved

4

16

Disable MNP Level 4; retransmitting the larger Lev el 4 data blocks may be a problem if you expect a great number of errors during a call.

5

32

Reserved

6

64

Some earlier 2400 bps MNP modems, not made by U.S. Robotics or Microcom, were not fully compatible with the MNP protocol. If you have difficulty making a successful 2400 bps MNP connection with a remote MNP modem, it may be because of this incompatibility. Set S15 to 64 and try again to make the connection.

7

128

Reserved

S16

0

Bit-mapped register. ( See the beginning of this section for information about setting bit -mapped registers). For testing, refer to the Testing the Connection part of the Configuration section.

Bit

Value

Result

0 1 Reserved

1 2 Dial Test.

2 4 Test pattern.

3 8 Reserved

4

16

Reserved

5

32

Reserved

6

64

Reserved

7

128

Reserved

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Register

Default

Function

S18

0

Test timer for software -initiated loopback testing (&T n); disabled when S18 is set to 0. Used to set the duration of testing, in seconds, before the Courier Lite 56K Business Modem automatically times out and terminates the test.

S19

0

Sets the duration, in minutes, for the Inactivity Timer. The timer activates when there is no data activity on the R232 interface, and at the timeout the Courier Lite 56K Business Modem hangs up. S19=0 disables the timer.

S21

10

Sets, in 10-millisecond units, the length of breaks sent from the Courier Lite 56K Business Modem to the computer or terminal. Applies to ARQ mode only. This command overwrites the current status of the + EB command, and is also overwritten by changes made by the +EB command.

S22

17

Stores the ASCII code for the XON character.

S23

19

Stores the ASCII code for the XOFF character.

S24

150

Sets the duration, in 20-millisecond units, between pulsed DSR signals when the Courier Lite 56K Business Modem is set to &S2 or &S3. The default is 3 seconds.

S25

5

Sets DTR recognition time in 10 -millisecond units.

S26

1

Reserved

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Register

Default

Function

S27

0

Bit-mapped register. ( See the beginning of this section for information about setting bit -mapped registers).

Bit

Value

Result

0

1

Enable ITU-T V.21 modulation at 300 bps for overseas calls. In V.21 mode, the Courier Lite 56K Business Modem answers both Bell 103 and V.21 calls, but only originates V.21 calls.

1 2 Reserved

2 4 Disable V.32 modulation .

3 8 Reserved

4

16

See error control handshaking options below.

5

32

See error control handshaking options below.

6

64

Reserved

7

128

Unusual software incompatibility. Some software may not accept some result codes. This setting disables the codes and displays the 9600 code instead. The call's actual rate can be viewed on the ATI6 screen.

Error control handshaking options: Select the total value of bits 4 and 5

Bit 4

Bit 5

Result

0

Complete handshaking sequence: V.42 Detection, LAPM error control, MNP.

16 0 Disable MNP.

0

32

Disable V.42 Detection and LAPM.

16

32

Disable Detection phase, if you know that the remote Courier Lite 56K Business Modem does LAPM, but not the Detection phase.

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Register

Default

Function

S28

8

Sets the duration in tenths of a second of the extra 3000/600 Hz answer tones sent during V.32 hand-shaking. This gives V.32 modems additional time to connect in V.32 mode before timing out. If there is difficulty answering older, manually operated V.32 modems (for example, modems that require a button to be pushed in order to dial), try lengthening the duration of the extra tones. Setting S28 to zero eliminates the extra tones resulting in a faster connect time if, for example, the Courier Lite 56K Business Modem is set to use V.21 modulation (300 bps) or V.23 modulation (1200 bps).

S29

20

Sets the duration, in tenths of a second, of the V.21 answer tone.

S32

9

Reserved

S34

0

Bit-mapped register. See the beginning of this section for information about setting bit -mapped registers.

Bit

Value

Result

0

1

Disable V.32 bis. Used for troubleshooting; Technical Support may ask you to disable V.32bis for testing purposes.

1 2 Reserved

2 4 Reserved

3 8 Enable V.23. Required for some British connections.

4

16

Reserved

5

32

Reserved

6

64

Reserved

7

128

Disable V.32 terbo.

S39

10

Display transmit level in dBm with an implied minus sign . Read-only.

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Register

Default

Function

S41

0

Sets the number of allowable remote-access login attempts, thus enabling or disabling remote access.

The default setting of zero allows no remote login attempts, disabling remote access. A value of 1 or greater enables remote access. If the number of unsuccessful login attempts exceeds the limit set by this register, the Courier Lite 56K Business Modem returns online and any further login attempts during the remainder of that connection are refused.

S42

126

Stores the ASCII decimal code for the remote -access escape character. The default character is a tilde (~).

S43

200

Sets the duration, in fiftieths of a second, of the guard time for the remote access (~~~~) sequence.

S44

15

Sets the duration, in seconds, of the interval between losing carrier and reestablishing a connection.

S51

0

Bit-mapped register. See the beginning of this section for information about setting bit -mapped registers.

Bit

Value

Result

0 1 Reserved

1 2 Reserved

2 4 Reserved

3 8 Reserved

4

16

Reserved

5

32

Reserved

6

64

Disable Selective Reject

7

128

Reserved

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Register

Default

Function

S53

126

Bit-mapped register. ( See the beginning of this section for information about setting bit -mapped registers).

Bit

Value

Result

0 1 Dial security enabled.

1 2 Prompting enabled.

2 4 Local-access password protection enabled.

3 8 DTMF security enabled.

4

16

Reserved

5

32

Reserved

6

64

Reserved

7

128

Reserved

S54

64

Symbol rate bit-mapped register used primarily by Technical Support for debugging purposes.

Bit

Value

Result

0 1 Disable 2400 symbol rate.

1 2 Disable 2743 symbol rate.

2 4 Disable 2800 symbol rate.

3 8 Disable 3000 symbol rate.

4

16

Disable 3200 symbol rate.

5

32

Disable 3429 symbol rate.

6

64

Disable Call Indicate (CI).

7

128

Disable V.8.

S55

0

Reserved

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Register

Default

Function

S56

0

Bit-mapped register primarily used by Technical Support for debugging purposes.

Bit

Value

Result

0 1 Reserved

1 2 Reserved

2 4 Reserved

3 8 Reserved

4

16

Reserved

5

32

Disable V.34+

6

64

Disable V.34.

7

128

Disable V.FC.

S58

0

Bit-mapped register. (See the beginning of this section for information about setting bit -mapped registers.)

Bit

Value

Result

0 1 Reserved

1 2 Reserved

2 4 Reserved

3 8 Reserved

4

16

Reserved

5

32

Enables/Disables V.90

6

64

Disables V.92 functions

7

128

Reserved

S59

0

Reserved

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Register

Default

Function

S69

0

Bit-mapped register. (See the beginning of this section for information about setting bit -mapped registers).

Bit

Value

Result

0 1 Disable external Plug and Play

1 2 Enable Auto Redial

2 4 Reserved

3 8 Reserved

4

16

Reserved

5

32

Reserved

6

64

Reserved

7

128

Reserved

S70

0

Bit-mapped Register. (See the beginning of this section for information about setting bit -mapped registers.)

Bit

Value

Result

0 1 Enable recognition of Ring A

1 2 Enable recognition of Ring B

2 4 Enable recognition of Ring C

3 8 Enable recognition of Ring D

4

16

Enable recognition of Ring E

5

32

Reserved

6

64

Reserved

7

128

Reserved

S71

0

RCID request delay (1/200 sec)

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Register

Default

Function

S72

0

Bit-mapped Register. (See the beginning of this section for information about setting bit -mapped registers.)

Bit

Value

Result

0 1 # of requests

1 2 # of requests

2 4 # of requests

3 8 Request duration * 10 mS

4

16

Request duration * 10 mS

5

32

Request duration * 10 mS

6

64

Request duration * 10 mS

7

128

Request duration * 10 mS

S73

0

Bit-mapped Register. (See the beginning of this section for information about setting bit -mapped registers.)

Bit

Value

Result

0 1 Request level

1 2 Request level

2 4 Request level

3 8 Request pause * 10 mS

4

16

Request pause * 10 mS

5

32

Request pause * 10 mS

6

64

Request pause * 10 mS

7

128

Request pause * 10 mS

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Command

Function

$

Display help for the Basic command set.

+++

Escape code. Once your modem is online with another device, the only command it recognizes is an escape code of three typed plus signs, which forces the modem back to Command mode. Do the following when issuing the command:

1. Wait 1 second after sending the last item of data.

2. Type +++

3. Wait 1 second before typing any data.

When you type +++, the modem will either hang up or stay on line, depending on how you set S14.

>

Repeat command. If you include the repeat command in the Dial string, the modem will dial the number and wait 60 seconds for a carrier.

If the line is busy, the modem will pause for 2 seconds and then redial. The modem makes a maximum of 10 attempts.

A/

Reexecute the last-issued command. DO NOT type AT or press ENTER.

A>

Repeat the last-issued command until canceled by pressing any key. DO NOT type AT or press Enter.

AT

Attention prefix: informs a modem that a command is coming. AT must precede all commands except A/, A>, and +++.

A

Force a modem to answer when it is not receiving an incoming call.

Alphabetic Command Summary

This section contains an alphabetic listing of the AT commands to which the modem will respond. Default settings are bold.

 Basic Command Set  Ampersand (&) Command Set  Percent (%) Command Set  Octothorpe (#) Command Set  V.80/V.250 Command Set  Additional V.92 Commands

Basic Command Set

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Command

Function

Bn

Set handshaking options.

B0

ITU-T V.25 answer sequence; required to answer all V.34-type and overseas calls.

B1

Bell answer tone; use if the modem is not required to answer V.34type calls.

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Command

Function

With the exception of the Dial options, modem ignores any commands issued after D in the same command string.

Dn

Dial a phone number and issue other optional commands.

The numbers 0-9 are accepted. The maximum number of characters allowed is 36, including the AT prefix, punctuation, and spaces.

Optional parameters:

P

Dial using pulses.

T

Dial using tones.

,

(Comma) Pause for 2 seconds (or the time in S-Register 8).

;

(Semicolon) Remain in Command mode after dialing.

"

Dial the letters that follow. Example, ATDT1800"DIAL USR" same as ATDT18003425877.

W

Wait for a second dial tone before continuing to dial (with X3 or higher).

@

Wait for an answer (with X3, X4, or X7).

/

Pause for 125 milliseconds.

R

Reverse frequencies. Use this command when calling an originate -only modem. It forces the modem to dial out at the answer frequency.

!

Flash the switchhook (off hook 0.5 seconds, on hook 0.5 seconds, then off hook). Use ! when other modems share the line.

L?

Display the last-dialed number.

L

Dial the last-dialed number.

Sn

Dial the number stored in memory at position n, where n = 0-4. Store the number in memory using the &Z command.

$

Display help for the dial commands. ATD$

En

Command mode echo. Enables or disables the display of your typed commands.

E0

Command mode echo OFF. Your typing will not appear on the screen.

E1

Command mode echo ON. Your typing will appear on the screen.

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Command

Function

If double characters appear on the screen, both the modem's local echo and your software's loca l echo are on.

Fn

Online local echo. If ON, a modem displays on your screen the data that it is transmitting to another modem.

F0

Online echo ON. (Sometimes called half duplex.)

F1

Online echo OFF. (Sometimes called full duplex.)

Hn

Go on or off hook.

H0

Go on hook (hang up).

H1

Go off hook (pick up).

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Command

Function

In

Query the modem.

I0

Displays the product code.

I1

Displays checksum.

I2

Displays RAM TEST.

I3

Displays the banner (product name).

I4

Display current modem settings.

I5

Display settings stored in NVRAM.

I6

Display statistics for the last call.

I7

Display product configuration.

I8

Lists phone numbers with redial restrictions.

I9

Displays modem’s Plug and Play ID.

I10

Display dial security account status information.

I11

Display link diagnostics report.

I15

Display caller ID information.

I16

Display channel probe report.

Mn

Control when the speaker sounds

M0

The speaker is always off.

M1

The speaker is on until the call is negotiated.

M2

The speaker is always on.

M3

The speaker turns on after the last digit is dialed and stays on until the call is negotiated.

On

Return online. Use with the escape code (+++) to toggle between command and online modes.

O0

Return online (normal).

O1

Return online and retrain. Use O1 if there were errors in a non -ARQ data transfer.

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Command

Function

Qn

Enable or disable the display of result codes.

Q0

Display result codes.

Q1

Suppress result codes (quiet).

Q2

Suppress result codes when answering.

S$

Display help screens for the S-Registers.

Sr=n

Set S-Register value: r is any S-Register; n must be a decimal number between 0 and 255.

Sr.b=n

Set a bit-mapped register: r is the S-register, b is the bit, and n is 0 (off) or 1 (on).

Sr?

Query contents of S-register r.

Refer to the S-Registers section for a listing of all the S-Registers.

Vn

Display result codes in words or numbers.

V0

Display result codes in numeric form.

V1

Display result codes in verbal form.

Xn

Control the amount of information displayed in the result codes. The default is X7

(all codes except 12/VOICE). The modem doesn’t try to detect signals if it isn’t set

to report them.

For more detailed information, refer to the Result Code Meanings and Sets section of the appendix.

X3

Ignore Dial Tone

X4

Microsoft default

X7

Courier Lite 56K Business Modem default

Yn

Control which user profile or factory profile is recalled when the modem is reset.

Y0

At reset use stored profile 0

Y1

At reset use stored profile 1

Y2

At reset use factory profile 0 (&F0)

Y3

At reset use factory profile 1 (&F1)

Y4

At reset use factory profile 2 (&F2)

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Command

Function

Zn

Software reset.

Z0

If DIP Switch 7 is ON (factory settings), recall the &F0 configuration template (no flow control). If DIP switch 7 is OFF, recall the profile selected by the Y command.

Z1

Reset using stored profile 0

Z2

Reset using stored profile 1

Z3

Reset using factory profile 0

Z4

Reset using factory profile 1

Z5

Reset using factory profile 2

Z!

Complete hardware reset

Command

Function

&$

Display help for the ampersand (&) command set.

&An

Enable or disable the display of additional result code subsets. (Also, see the Xn command.)

&A0

Do not display ARQ result codes.

&A1

Display ARQ result codes.

&A2

In addition to ARQ result codes, display V.32, V.FC, V.34, V.90, or V.92 modulation indicator.

&A3

In addition to ARQ and modulation indicators, display an error control indicator (LAPM, MNP, SYNC, or NONE) and a data compression type (V42 bis or MNP5).

&Bn

Set the serial port rate to variable or fixed.

&B0

Variable: The serial port rate adapts to match the speed of the connection.

&B1

Fixed: The modem always communicates with your computer at the rate at which you have set, regardless of the connection rate.

&B2

When answering calls, use the fixed rate for ARQ calls and variable rates for non-ARQ calls.

The serial port rate should be equal to or higher than the &Nn rate.

Ampersand (&) Command Set

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Command

Function

&Cn

Controls how the modem sends a Carrier Detect (CD) signal to your computer.

&C0

CD always ON, even if the modem is not on line.

&C1

Normal operations. The modem sends a CD signal when it connects with another modem and drops the CD when it disconnects.

&Dn

Control how the modem responds to Data Terminal Ready (DTR) signals.

&D0

DTR is always ON (ignored).

&D1

If issued before connecting with another device, the Courier Lite 56K Business Modem can enter online Command mode during a call by dropping DTR.

&D1 functions similarly to the escape code (+++).

Return online with the On command, or hang up with the Hn command.

&D2

Normal DTR operations. The modem will not accept commands unless your computer sends a DTR signal. Dropping DTR ends a call.

&D3

Modem resets with DTR toggle.

&Fn

Load one of the three configuration templates that are stored permanently in readonly memory. Refer to the Flow Control Template section for the settings for each template.

To load a template into current memory, enter AT&Fn. To write a template to NVRAM, enter AT&Fn&W0 or AT&Fn&W1.

If DIP switch 7 is ON, &F0 is always loaded into memory at power -on or reset. &F0

Load No Flow Control template settings.

&F1

Load Hardware Flow Control template settings.

&F2

Load Software Flow Control template settings.

&Gn

Set guard tones for international calls.

&G0

No guard tone. Use this in the United States and Canada.

&G1

This sets a 550 Hz guard tone, and is used in some European countries.

&G2

This sets an 1800 Hz guard tone, and is used in the U.K. and some Commonwealth countries. &G2 requires the B0 setting.

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Command

Function

&Hn

Transmit data flow control. Prevents the modem’s buffer for data transmitted to the

modem by its attached computer from overflowing.

&H0

Disable transmit data flow control.

&H1

Use hardware flow control. Requires that your computer and software support Clear to Send (CTS) at the EIA -232 interface.

&H2

Use software flow control. Requires that your software support XON/XOFF signaling

&H3

Use both hardware and software flow control. If you are unsure about what your equipment supports, select this option.

&In

Received data software flow (XON/OFF) control.

&I1

The modem acts on your typed XON/XOFF commands, Ctrl -S or Ctrl-Q, and passes them to the remote device.

&I2

The modem acts on your XON/XOFF commands, but removes them from the data stream instead of passing them to the remote device. This is the recommended setting for ARQ mode.

&Kn

Enable or disable data compression. This command overwrites the current status of the +DCS and +DS commands, and is also overwritten by changes made by the +DCS and +DS commands.

&K0

Disable data compression.

&K1

Use auto-enable/disable. The modem enables compression if the serial port rate is fixed (&B1) and disables compression if the serial port rate follows the connection rate (&B0) because compression offers no throughput advantage when the serial port and connection rates are equal; in fact, compression may degrade throughput.

&K2

Always enable data compression.

&K3

Selective data compression. The modem negotiates only for V.42 bis compression, and disables MNP Level 5 (MNP5) compression. Use this setting to transfer compressed files.

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Command

Function

&Mn

Enable ARQ (error control) protocols. Both your modem and the remote device must use the same protocol.

&M0

Normal mode, no error control. Due to the nature of phone line channels, this is never recommended for calls above 2400 bps.

&M4

Normal/ARQ mode. If an ARQ connection isn't made, the modem operates in Normal mode as though it were set to &M0.

&M5

ARQ asynchronous mode. The modem hangs up if an ARQ connection cannot be made.

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Command

Function

&Nn

Sets highest fixed link speed.

&Un

Sets lowest fixed link speed.

n=0

Variable rate. The modem negotiates with the remote device for the highest possible connection rate, depending on the capabilities of the remote device.

n=1-38

Fixed rate. The modem connects only if the remote device is operating at the same rate or higher.

The connection rate should be lower than or equal to the serial port rate.

n=1

300 bps

n=2

1200 bps

n=3

2400 bps

n=4

4800 bps

n=5

7200 bps

n=6

9600 bps

n=7

12000 bps

n=8

14400 bps

n=9

16800 bps

n=10

19200 bps

n=11

21600 bps

n=12

24000 bps

n=13

26400 bps

n=14

28800 bps

n=15

31200 bps

n=16

33600 bps

n=17

28000 bps

n=18

29333 bps

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Command

Function

n=19

30666 bps

n=20

32000 bps

n=21

33333 bps

n=22

34666 bps

n=23

36000 bps

n=24

37333 bps

n=25

38666 bps

n=26

40000 bps

n=27

41333 bps

n=28

42666 bps

n=29

44000 bps

n=30

45333 bps

n=31

46666 bps

n=32

48000 bps

n=33

49333 bps

n=34

50666 bps

n=35

52000 bps

n=36

53333 bps

n=37

54666 bps

n=38

56000 bps

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Command

Function

&Pn

Enable pulse dial.

n=0

Pulse dial disabled

n=1

Austria, Czechoslovakia, Denmark, Finland, Germany, Italy, Netherlands, South Africa (Second option for Asia, France, Korea, Norway, South Africa)

n=2

Australia, Asia, Belgium, France, Ireland, Korea, Portugal, South Africa, Spain

n=3

Norway

n=5

Japan

n=6

Sweden

n=7

(Second option for Australia)

&Rn

Received data (RTS) hardware flow control.

&R1

Ignore RTS. This setting is required if your computer or terminal or software does not support RTS.

&R2

Enable hardware flow control of received data. The modem sends data to the computer only upon receipt of the RTS signal.

&Sn

Send the computer a Data Set Ready (DSR) signal via the EIA-232 interface.

&S0

DSR is always ON (override).

&S1

In Originate mode: Send DSR after dialing, on detection of the remote

device’s answer tone. In Answer mode: Send DSR after sending an

answer tone.

&S2

When Carrier is lost, send a pulsed DSR signal with Clear to Send (CTS) following Carrier Detect (CD). This option is for specialized equipment such as automatic callback units.

&S3

Same as &S2, but without the CTS signal.

&S4

Send the computer DSR at the same time as CD.

&S5

Send DSR normally, and follow CTS with CD.

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Command

Function

&Tn

Test the modem.

&T0

End testing.

&T1

Local analog loopback

&T3

Local digital loopback

&T8

Local analog loopback with test pattern

&Wn

Write the current settings to NVRAM.

&W0

Store current configuration to profile 0.

&W1

Store current configuration to profile 1.

&Yn

Break handling. This command lets you send a break to stop data transfer without disconnecting. This command overwrites the current status of the + EB command, and is also overwritten by changes made by the + EB command.

&Y0

Enter on-line command mode. Returning to data mode sends break.

&Y1

Destructive, expedited.

&Y2

Nondestructive, expedited.

&Y3

Nondestructive, unexpedited; the modem sends a break -in-sequence with data received from your computer or terminal.

If the call is under data compression, destructive breaks cause both modems to reset their data

compression tables. When transmission resumes, the modems build new tables, and the result is temporary lower-than-normal throughput.

&Zn=s

Store up to 5 numbers in NVRAM, where n is the position 0-4 in NVRAM, and s is the phone number string. The number string may be up to 36 characters long, including any Dial command options.

Example: AT&Z2=555-6789

In the following example, &M0 (no error control) is inserted before the Dial command. Example: AT&M0 DS2

This command functions differently when Dial Security is enabled.

Also, do not include modem settings in the &Zn string. If the call requires a special setting, insert it in the command string before the DSn command.

Page 59 of 94

Command

Function

&Zn=L

Stores the last-dialed number in position n.

&Zn?

Display the phone number stored in NVRAM at position n (where n = 0 -4).

Command

Function

%$

Display help for the percent (%) command set.

%An

Create and configure security accounts. Refer to the Dial Security section.

%Bn

Remotely configure a modem's serial port rate.

%B0

110 bps

%B1

300 bps

%B2

600 bps

%B3

1200 bps

%B4

2400 bps

%B5

4800 bps

%B6

9600 bps

%B7

19200 bps

%B8

38400 bps

%B9

57600 bps

%B10

76800 bps

%B11

115200 bps

%B12

230400 bps

%Cn

Remote configuration control.

%C0

Defer configuration changes until the call is ended. Changes take effect for ensuing connections.

%C1

Cancel configuration changes and restore the original configuration.

Using %C1 will not reverse any changes that you wrote to NVRAM (with &W) or forced (with %C2).

%C2

Force configuration changes to take effect immediately.

We recommend against forcing configuration c hanges unless it is absolutely necessary. An unreliable connection, or loss of connection, may result.

%D=

Set a DTMF password. Refer to the Dial Security section.

Percent (%) Command Set

5686G-PRO User Guide

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Command

Function

%E=n

Erase security settings.

%E=1

Erase local-access password.

%E=2

Erase Autopass password.

%E=3

Erase passwords in accounts 0-4.

%E=4

Erase phone numbers in accounts 0-4.

%E=5

Disable Account, Dialback, and New Number fields in accounts 0 -4.

%Fn

Remotely configure another device’s data format.

%F0

No parity, 8 data bits.

%F1

Mark parity, 7 data bits.

%F2

Odd parity, 7 data bits.

%F3

Even parity, 7 data bits.

%L=

Set a local-access password. Refer to the Dial Security section.

%Pn=

Disable password security (n=0 or n=1) when no character follows the equal sign.

%Pn=s

Set the following password (s) for viewing privileges only (n = 0), or view and configuration privileges (n= 1).

%Pn?

Display password n.

%S=n

Access the security accounts. Does not disable security.

%T

Enable the recognition of tone frequencies of analog dialing devices. %T is meant primarily for use with network applications, but may also be integrated into certain software programs. For example, %T could be used in a security program to identify incoming tone security codes.

To return the modem to Command mode, press any key or drop the computer's or terminal's DTR signal. The modem responds OK.

%V=PWn

Assign the password in account n in your modem’s security account as your Autopass password

Command

Function

#$

Display the help panels for the octothorpe (#) command set.

Octothorpe (#) Command Set

Page 61 of 94

Command

Function

#CID=n

Controls the caller ID settings.

#CID=0

Disable caller ID detection and reporting.

#CID=1

Enable caller ID with formatted output.

#CID=2

Enable caller ID with unformatted output.

#CID=3

Enable caller ID with formatted output and name suppressed.

#CID=4

Enable caller ID but do not transmit the information to your computer retain it in the modem’s memory.

#CID?

Display the current caller ID settings.

#CID=?

Display the caller ID actions that are available.

Command

Function

+DCS=n,m

Use this command to configure the available compression algorithms. The n parameter enables or disables V.42bis, and the m parameter enables or disables V.44. This command works in conjunction with the &K command, and the result of either the &K command or the +DCS command replaces the current data compression configuration.

n=0

Disable V.42bis.

n=1

Enable V.42bis.

m=0

Disable V.44.

m=1

Enable V.44.

m=2

Enable V.44 for V.92 servers only.

+DCS?

Display current +DCS setting.

+DCS=?

Display list of valid +DCS settings.

+DR=n

Use this command to enable or disable the compression report. If the compression report is enabled, the +DR:<type> intermediate result code reports the current data compression type. It is issued after the error control report (+ER) and before the final result code (e.g., CONNECT).

n=0

Disable the compression report.

n=1

Enable the compression report.

+DR?

Display current +DR setting.

+DR=?

Display list of valid +DR settings.

V.80/V.250 Command Set

5686G-PRO User Guide

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Command

Function

+DS=n,m,l,k

Set V.42 compression method. This command overwrites the current status of the &K command, and is also overwritten by changes made by the &K command.

n=0

Do not negotiate V.42bis compression.

n=3

Modem accepts V.42bis compression in both direction.

m=0

Don’t disconnect if V.42 negotiations fail. This parameter is always set to 0.

l=2048

Dictionary size, always set to 2048.

k=32

String length, always set to 32.

+DS?

Display current +DS setting.

+DS=?

Display list of valid +DS settings.

+EB=n,m,l

Set break handling method. This command overwrites the current status of the &Y command and S21, and is also overwritten by changes made by the &Y command and S21.

n=0

Enter on-line command mode. Returning to data mode sends break.

n=1

Nonexpedited, nondestructive.

n=2

Expedited, nondestructive.

n=3

Expedited, destructive.

m=0

Break length is timed. This parameter is always set to 0.

l=10-90

Set break length in 10 millisecond units, in steps of 10.

+EB?

Display current +EB setting. Break length is displayed in milliseconds.

+EB=?

Display list of valid +EB settings.

+ER=n

Set error control reporting. The +ER:<type> intermediate result code reports the current error control type, issued after the modulation report and before the data compression report.

n=0

Disables the error control report.

n=1

Enables the error control report.

+ER?

Display current +ER setting.

+ER=?

Display list of valid +ER settings.

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Command

Function

+ETBM=n,m,l

Set call termination buffer management. 0,0,0 is the only valid combination, which means the modem discards all buffered data when the call is terminated.

n=0

This parameter is always set to 0.

m=0

This parameter is always set to 0.

l=0

This parameter is always set to 0.

+ETBM?

Display current +ETBM setting.

+ETBM=?

Display list of valid +ETBM settings.

+ILRR=n

Set local rate reporting. Use this command to display or hide the local rate report result code. The rate report is an intermediate result code , transmitted after any modulation, error control, or data compression reports, and before the final result code (e.g., CONNECT).

n=0

Disables the local rate report.

n=1

Enables the local rate report.

+ILRR?

Display current +ILRR setting.

+ILRR=?

Display list of valid +ILRR settings.

+MR=n

Set modulation reporting mode . Use this command to hide or display the modulation report. The modulation report is an intermediate result code, transmitted after the modulation and the rate have been determined , and before any error control or data compression reports or the final result code (e.g., CONNECT).

n=0

Turns off the modulation report.

n=1

Turns on the modulation report.

+MR?

Display current +MR setting.

+MR=?

Display list of valid +MR settings.

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Command

Function

+MS=n,m,I,k,j,i

Set modulation selection. Use this command to set the modem’s modulation, the maximum transmission and reception rates, and the status of automatic modulation negotiation.

n=V92

V.92

n=V90

V.90

n=V34

V.34

n=V32B

V.32bis

n=V32

V.32

n=V22B

V.22bis

n=V.22

V.22

n=Bell212A

Bell 212A

n=V23C

V.23, constant carrier, asymmetric FDM

n=V21

V21

m=0

Disable automatic modulation negotiation.

m=1

Enable automatic modulation negotiation.

If a value is specified for k, automatic rate selection is disabled

and the modem attempts to connect at the specified rate.

l=0

Minimum transmission rate, always set to 0.

k=0

Use automatic transmission rate selection.

k=30033600

Maximum transmission rate. Default=31200

V34:

2400-33600 in steps of 2400

V32bis:

4800-19200 in steps of 2400

V32:

4800-14400 in steps of 2400

V22bis:

2400

V22:

2200

V23C, Bell212A:

1200

V.21, Bell103:

300

j=0

Minimum reception rate, always set to 0.

i=0

Use automatic reception rate selection.

i=30056000

Maximum reception rate. Default=31200 +MS?

Display current +MS setting.

+MS=?

Display list of valid +MS settings.

Page 65 of 94

Command

Function

+p$

Display help for the +p command set.

+pCW=n

Controls call waiting.

+pCW=0

Process call waiting

+pCW=1

Disconnect on call waiting

+pCW=2

Ignore call waiting

+pIG=n

Controls PCM upstream.

+pIG=0

Enable PCM upstream

+pIG=1

Disable PCM upstream

+pMH=n

Controls Modem on Hold.

+pMH=0

Enable Modem on Hold

+pMH=1

Disable Modem on Hold

+pMHD

Send DTMF during MOH

+pMHR

Request Modem on Hold.

+pMHT?

Display Modem on Hold timeout.

+pQC=n

Controls phases of QC.

+pQC=0

Enable phase 1 and phase 2 of QC

+pQC=1

Disable phase 1 and enable phase 2 of QC

+pQC=3

Disable phase 1 and phase 2 of QC

+pSS=n

Controls short sequences.

+pSS=0

Modem decides on short sequences

+p Command Set (V.92 Commands)

5686G-PRO User Guide

Flow Control Template

 Hardware Flow Control  Software Flow Control  No Flow Control

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NVRAM Options

Setting

Description

Handshake option

B0

ITU-T answer s equence

Command mode e cho

E1

Enabled

Online local echo

F1

Disabled

Speaker control

M1

ON during dial through connect

Result codes

Q0

Enabled

Verbal or numeric re sult codes

V1

Verbal result codes

Result code subset

X7

Extended. Includes all cod es except VOICE

Profile used at reset

Y0

At reset use stored profil e 0

Protocol respons e codes

&A3

Full protocol codes

Serial port rate select

&B1

Serial port rate fixed highe r than connect rate

Guard tone

&G0

U.S./Canada

Transmit data hard ware flow control

&H1

Hardware flow cont ro l

Received data softwa re flo w control

&I2

No pass-th ru Analog data co mpression

&K1

Enabled

Error control/sync

&M4

Normal/error control

Highest Link rate select

&N0

Variable

Pulse dialing type

&P1

U.S., Canada, and other countries

Received data hard ware flow control

&R2

Enabled Data Set Ready

&S0

Always on

Remote Digital Loopback (RDL)

&T5

Deny RDL

Lowest Link rate select

&U0

Variable

Break handling

&Y1

Clear buffer, send immed iately

Caller ID

#CID=0

Caller ID disabled

Set Compression Method

+DCS=1,0

Enable V.42bis , Disable V.44

Set Compression Report Mode

+DR=0

Disable the report

Set V.42 Compression Method +DS=3,0,2048,32

Accept V.42b is , don’t disconnect if fail, 2048 dictionary, 32 string

Hardware Flow Control

The table below lists the Hardware flow control template. To load this template send AT&F1 to your modem.

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NVRAM Options

Setting

Description

Set Break Handling Method

+EB=3,0,10

Expedited, destructi ve , 100mS

Set Error Control Reporting

+ER=0

Disable the report

Set Call Termination Buffer Management

+ETBM=0,0,0

Flush all bu ff er s on call termination

Set Local Rate Reporting

+ILRR=0

Disable the report

Set Modulation Reporting Mode

+MR=0

Disable the report

Set Modulation Selection +MS=V92,1,0,31200,0,56000

V.92, auto, auto, 31.2k max tx,56k max rx

Word length*

8

Parity*

0

None

DTE rate* (Kbps)

19.2

_

NVRAM Options

Setting

Description

Handshake option

B0

ITU-T answer s equence

Command mode e cho

E1

Enabled

Online local echo

F1

Disabled

Speaker control

M1

ON during dial through connect

Result codes

Q0

Enabled

Verbal or numeric re sult codes

V1

Verbal result codes

Result code su bset

X7

Extended. Includes all cod es except VOICE

Profile used at reset

Y0

At reset use stored profil e 0

Protocol respons e codes

&A3

Full protocol codes

Serial port rate sel ect

&B1

Serial port rate fixed highe r than connect rate

Guard tone

&G0

U.S./Canada

Transmit data hard ware flow control

&H2

Software flow contro l

Received data softwa re flo w control

&I2

No pass-th ru Analog data co mpression

&K1

Enabled

* De tect ed by each modem fro m the AT prefix of the &W c omma nd tha t writes your defaults to NVRAM. Set your software to the desired word length, parity, and serial port ra te d ef ault s be fo re s en di ng t he m od em t he AT... & W st ring.

Software Flow control

The table below lists the Software flow control template. To load this template send AT&F2 to the modem. Items in bold denote the changes to (or differences from) the &F1 template.

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NVRAM Options

Setting

Description

Error control/sync

&M4

Normal/error control

Highest Link rate select

&N0

Variable

Pulse dialing type

&P1

U.S., Canada, and other countries

Received data hard ware flow control

&R1

Enabled Data Set Ready

&S0

Always on

Remote Digital Loopback (RDL)

&T5

Deny RDL

Lowest Link rate select

&U0

Variable

Break handling

&Y1

Clear buffer, send immed iately

Caller ID

#CID=0

Caller ID disabled

Set Compression Method

+DCS=1,0

Enable V.42bis , Disable V.44

Set Compression Report Mode

+DR=0

Disable the report

Set V.42 Compression Method +DS=3,0,2048,32

Accept V.42b is , don’t disconnect if fail, 2048 dictionary, 32 string

Set Break Handling Method

+EB=3,0,10

Expedited, destructi ve , 100mS

Set Error Control Reporting

+ER=0

Disable the report

Set Call Termination Buffer Management

+ETBM=0,0,0

Flush all bu ff er s on call termination

Set Local Rate Reporting

+ILRR=0

Disable the report

Set Modulation Reporting Mode

+MR=0

Disable the report

Set Modulation Selection +MS=V92,1,0,31200,0,56000

V.92, auto, auto, 31.2k ma x tx,56k max rx

Word length*

8 Parity*

0

None

DTE rate* (Kbps)

19.2

_

NVRAM Options

Setting

Description

Handshake option

B0

ITU-T answer s equence

Command mode e cho

E1

Enabled

Online local echo

F1

Disabled

Speaker co ntro l

M1

ON during dial through connect

* Detected by each modem from the AT prefix of the &W command that writes your defaults to NVRAM. Set yo ur software to the desired word length, parity, and serial port ra te d ef ault s be fo re s en di ng t he m od em t he AT... & W st ring.

No Flow Control

The table below lists the No Flow Control template. To load this template send AT&F0 to the modem. Items in bold denote the changes to (or differences from) the &F1 template.

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5686G-PRO User Guide

NVRAM Options

Setting

Description

Result codes

Q0

Enabled

Verbal or numeric re sult codes

V1

Verbal result codes

Result code subset

X1

Basic

Profile used at reset

Y0

At reset use stored profil e 0

Protocol respons e codes

&A1

ARQ protocol codes

Serial port rate sel ect

&B0

Variable serial port rat e

Guard tone

&G0

U.S./Canada

Transmit data hard ware flow control

&H0

Disabled

Received data softwa re flo w control

&I2

No pass-th ru Analog data co mpression

&K1

Enabled

Error control/sync

&M4

Normal/error control

Highest Link rate select

&N0

Variable

Pulse dialing type

&P1

U.S., Canada, and other countries

Received data hard ware flow control

&R1

Disabled Data Set Ready

&S0

Always on

Remote Digital Loopback (RDL)

&T5

Deny RDL

Lowest Link rate select

&U0

Variable

Break handling

&Y1

Clear buffer, send immed iately

Set Compression Method

+DCS=1,0

Enable V.42bis , Disable V.44

Set Compression Report Mode

+DR=0

Disable the report

Set V.42 Compression Method +DS=3,0,2048,32

Accept V.42b is , don’t disconnect if fail, 2048 dictionary, 32 string

Set Break Handling Method

+EB=3,0,10

Expedited, d estructive, 100mS

Set Error Control Reporting

+ER=0

Disable the report

Set Call Termination Buffer Management

+ETBM=0,0,0

Flush all bu ff er s on call termination

Set Local Rate Reporting

+ILRR=0

Disable the report

Set Modulation Reporting Mode

+MR=0

Disable the report

Set Modulation Selection +MS=V92,1,0,31200,0,56000

V.92, auto, auto, 31.2k ma x tx,56k max rx

Set Compression Method

+DCS=1,0

Enable V.42bis , Disable V.44

Word length*

7

Parity*

1

Even

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5686G-PRO User Guide

NVRAM Options

Setting

Description

DTE rate* (Kbps)

9600

_

* Detected by each modem fro m the AT prefix of the &W command that writes your defaults to NVRAM. Set yo ur software to the desired word length, parity, and serial port ra te d ef ault s be fo re s en di ng t he m od em t he AT... & W st ring.

Result Code Meanings and Sets

 Result Code Meanings  Result Codes Sets for Xn Values  New Connect Messages

Page 71 of 94

Result Code

Meaning

0/OK

Command has been executed.

1/CONNECT

Connection with another device.

2/RING

Incoming ring detected.

3/NO CARRIER

Carrier Detect has failed, or carrier has been dropped due to disconnect.

4/ERROR

Command is invalid.

5/CONNECT 1200

Connection at reported rate. Same meaning for results of 2400 (10), 4800 (18), 7200 (20), 9600 (13), 12000 (21), 14400 (25), 16800 (43), 19200 (85), 21600 (91), 24000 (99), 26400 (103), 28800 (107), 31200 (151), 33600 (155), or 56000 (162) bps.

6/NO DIAL TONE

Dial tone not detected during the default 2 seconds, set in Register S6.

7/BUSY

Busy signal detect; modem hangs up.

8/NO ANSWER

After waiting 5 seconds for an answer, modem hangs up; returned instead of NO CARRIER when the @ option is used.

11/RINGING

The modem has dialed; remote phone line is ringing.

12/VOICE

Voice answer at remote site; modem hangs up.

170/RING A