ZyXEL Communications 3356P-LAN User Manual

Comet 3356P-LAN

User’s Manual

Version 1.0

ZyXEL

A

CCESSING THE INTERNET AND INTRANET

Limited Warranty

ZyXEL warrants to the original end user (purchaser) that this product is free from any defects
in materials or workmanship for a period of up to two (2) years from the date of purchase.
During the warranty period, and upon proof of purchase, should the product have indications of
failure due to faulty workmanship and/or materials, ZyXEL will, at its option, repair or replace
the defective products or components without charge for either parts or labor, and to whatever
extent it shall deem necessary to restore the product or components to proper operating
condition. Any replacement will consist of a new or remanufactured functionally equivalent
product of equal value, and will be solely at the option of ZyXEL. This warranty shall not
apply if the product is modified, misused, tampered with, damaged by an act of God, or
subjected to abnormal working conditions.

Note: Repair or replacement, as provided under this warranty, is the exclusive remedy of the
purchaser. This warranty is in lieu of all other warranties, express or implied, including any
implied warranty of merchantability or fitness for a particular use or purpose. ZyXEL shall in
no event be held liable for indirect or consequential damages of any kind or character to the
purchaser.

Acknowledgments

The trademarks and brand names mentioned in this manual are used for plain informational
purposes. Trademarks and brand names are the property of their respective owners.

FCC Part 15 Information

This device complies with Part 15 of FCC rules. Operation is subject to the following two
conditions:

1. This device may not cause harmful interference.

2. This device must accept any interference received, including interference that may cause
undesired operations.

This equipment has been tested and found to comply with the limits for a CLASS B digital
device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses, and can radiate radio frequency energy, and if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio/television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and the receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver

is connected.

• Consult the dealer or an experienced radio/TV technician for help.

ii

Changes or modifications not expressly approved by the party responsible for compliance could
void the user’s authority to operate the equipment. Shielded RS-232 cables are required to be
used to ensure compliance with FCC Part 15, and it is the responsibility of the user to provide
and use shielded RS-232 cables.

FCC Requirements

This equipment complies with Part 68 of the FCC Rules. On the base unit of this equipment is a
label that contains, among other information, the FCC Registration Number and the Ringer
Equivalence Number (REN) for this equipment.

IF REQUESTED, THIS INFORMATION MUST BE GIVEN TO THE TELEPHONE
COMPANY.

The REN is useful to determine the quantity of the devices you may connect to your telephone
line and still have all of those devices ring when your telephone number is called. In most, but
not all areas, the sum of the RENs of all devices connected to one line should not exceed five
(5.0). To be certain of the number of devices you may connect to your line, as determined by
the total RENs, you should contact your local telephone company to determine the maximum
REN for your calling area.

If your equipment causes harm to the telephone network, the telephone company may
discontinue your service temporarily. If possible, they will notify you in advance. But if
advance notice isn’t practical, you will be notified as soon as possible. You will be informed of
your right to file a complaint with the FCC.

Your telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect the proper functioning of your equipment. If they do, you will be
notified in advance to give you an opportunity to maintain uninterrupted telephone service.

If you experience trouble with this telephone equipment, please contact the Address and Phone
number listed in the warranty card for information on obtaining service or repairs.

The telephone company may ask that you disconnect this equipment from the network until the
problem has been corrected or until you are sure the equipment is not malfunctioning.

The user is not authorized to repair or modify the equipment.
This equipment may not be used on coin service provided by the telephone company.

Connection to party lines is subject to state tariffs.
You will find also this information on a sticker on the bottom of the modems case.
The modem is connected to a public switched line using a USOC (Universal Service Order

RJ-11

Code)

C modular jack.

Contacting ZyXEL

If you have questions about your ZyXEL product or desire assistance, contact ZyXEL
Communications Corporation in one of the following ways:

Phone

•

: In North America call between 8:00 AM and 5:00 PM PST at

[phone].

iii

Outside North America, you can dial [phone] EXT 252 between 8:00AM

and 5:00PM Taiwan time (GMT +8:00).

• Fax: ZyXEL in North America: [phone] or Taiwan: [phone].

• E-mail:

• Sales inquiries: [e-mail] in North America.

[e-mail] outside North America.

• Technical support: [e-mail] in North America.

[e-mail] outside North America.

• Product information: Visit our site on the World Wide Web:
http://www.zyxel.com.

• FTP: Information , such as ZyXEL software and ROM updates for North America
can be found at this FTP address: ftp.zyxel.com

For European versions and related files, use the address: ftp.zyxel.co.at

• Postal Service: You can send written communications at the following address:

ZyXEL Communications Corporation
6, Innovation Road II, Science-Based Industrial Park
Hsinchu, Taiwan 300, ROC
or
ZyXEL Communications Inc.
4920 E. La Palma Avenue
Anaheim, CA92807, USA

iv

Table of Contents

Limited Warranty ii
FCC Part 15 Information ii
FCC Requirements iii
Contacting ZyXEL iii

1 Introduction 1

Unpacking Your Modem 1
Hardware Overview 1
Required Equipment 1

2 Installation 3

Hardware 3
Non-Windows 95 & Windows NT Operating Systems 3

Novell Netware Installation 3
MS LAN Manager Installation 4
Packet Driver Installation 6
Windows for Workgroups 3.11 Installation 6
Windows NT 3.51 Installation 7
Windows NT4.0 Installation 8
Windows 95 Installation 10
Artisoft Lantastic 6.0 Installation 10

3 Basic Modem Operation 13

Understanding AT Commands 13

Using the Windows 95 Hyper Terminal Program 13

Dialing and Answering Techniques 14

Dialing using the ATD Command 14
Auto-Answer and Hook Controls 15

Making Your First Connection 15
Quick Tips when issuing AT Commands 15

v

Modem Result Codes 17
Viewing S Register Values 17
Changing S Register Values 17

Non-Volatile Memory 17

Storing Phone Numbers 17
Dialing Stored Phone Numbers 18
Saving Settings and User Profiles 18
Default Modem Settings for PC’s 18

4 AT Command Set Summaries 21

Basic AT Command Set 21
Extended AT& Command Set 23
Extended AT\ Command Set 24
Extended AT% Command Set 24
Extended AT- Command Set 25

5 Status Registers & Result Codes 27

Result Code Options 29

vi

1

Congratulations on the purchase of your Comet 3356P-LAN Type II PCMCIA card,
one of ZyXEL's premier high-performance products. The Comet is world renown for
its ability to maintain ultra high speeds and clear, quality connections while
communicating around the globe.

Introduction

Unpacking Your Modem

Before you proceed, check all items you received with your modem against this list to
make sure nothing is missing. The complete package should include:

• One Comet 3356 P-LAN

• One detachable interface cable with RJ-11 cable and plug.

• One detachable interface RJ-45 LAN cable and plug.

• One FAX & Data Communication software package.

• One INF file disk for Windows 95 and Windows NT 4.x.

Hardware Overview

The Comet is an intelligent high-speed fax/modem and Ethernet LAN adapter. The
modem can be used as both a send/receive fax machine and a data modem. When
connecting to another modem/fax, the modem automatically negotiates the fastest
speed possible. The PC Card FAX/MODEM/LAN is designed to work with many of
the popular fax/modem and LAN communication software packages. Some software
packages will control and configure the fax/modem for you automatically, however,
they are usually only useful to those who need the modem to perform special tasks. AT
commands can also be used to control the fax/modem manually.

Required Equipment

Make sure you have the additional equipment below before proceeding with
Installation:

• An IBM compatible PC or notebook with PCMCIA type II slot and 386SX or
better CPU.

• PCMCIA Socket Service and Card Service drivers. (These drivers are usually
included with the computer. If not, check with your computer dealer.)

• A telephone line with RJ-11 connector.

• Data and/or Fax communication software.

Introduction 1

2 Introduction

2

This chapter describes how to install your Comet hardware. Installation procedures
also cover Windows 3.x, Windows 95, Windows NT 4.0, and DOS operating systems.

Installation

Hardware

You can insert your Comet with your computer turned on or off. Follow the steps
below to complete the hardware installation:

1. Hold the card label up and insert the card into the computer's PCMCIA slot with
the 68 pin connector facing the computer.

2. Plug the 15-pin PC Card connector with both RJ-45 LAN cord and RJ-11
telephone cord into the 15-pin socket on the PC Card. Now the hardware
installation is completed. The PC Card is powered directly by the PC.

3. Connect the RJ-45 (8-pin) plug to the LAN and the RJ-11 (6-pin) plug to the
telephone wall outlet.

Non-Windows 95 & Windows NT Operating Systems

Novell Netware Installation

Follow the steps bellow to complete Novell Netware installation:

1. Insert the driver diskette into the floppy drive and set to the appropriate drive
(A:\). Then type

2. Select

3. Check the card settings. If current settings are correct, select

4. Select the appropriate values then press

Netware 3.x and 4.x Workstation

box.

and go to step 5. Otherwise, select

to exit.

INSTALL

and press

Enter

.

from the installation program dialog

Start Installation

Modify Parameters

Enter

. When you are finished, press

to change settings.

Installation 3

OK

5. The installation program will install all necessary drivers and modify your
computers AUTOEXEC.BAT and NET.CFG directories.

6. Select Yes then press Enter to modify the files.

7. Reboot your computer and the new settings will take effect.

For manual installation of ODI drivers, follow the instructions below:

1. Copy the files \NETWARE\LM28ODI.COM \NETWARE\NET.CFG and
\ENABLER\CARDEN.EXE \ENABLER\LMVXD.386 from the driver disk to
your hard disk.

2. Use a text editor to edit the NET.CFG and set the frame type. The frame type
default is set to 802.3 for Netware 3.11 server and 802.2 for Netware 3.12 and 4.x
servers. The frame type set in NET.CFG must match that set in Netware servers.

3. Using following format to create a startup batch file:

CARDEN /IOP=nnn /IRQ=nnn /COM=n /MIR=n
LSL ;Link Support Layer Module
;provided by Novell
LM28ODI ;Hardware Specific Module
IPXODI ;IPX Protocol Stack Module
;provided by Novell
NETx ;Shell Support Module provided by
;Novell
LOGIN

MS LAN Manager Installation

1. Before installing the drivers, make sure that the Microsoft LAN Manager has been
installed in the target path. The installation program will check and modify the
PROTOCOL.INI file for LAN Manager.

4 Installation

2. Insert the driver diskette into the floppy drive and set to the appropriate drive
(A:\). Then type INSTALL and press Enter.

3. Select Microsoft LAN Manager from the menu screen.

4. Check the card settings. If current settings are correct, select Start Installation
and go to step 5. Otherwise, select Modify Parameters to change settings.

5. Select the appropriate values then press Enter. When you are finished, press OK
to exit.

6. The installation program will install all necessary drivers and modify your
computers AUTOEXEC.BAT and NET.CFG directories.

7. Select Yes then press Enter to modify the files.

8. Reboot your computer and the new settings will take effect.
Example of PROTOCOL.INI:

[PROTMAN]

DRIVERNAME = PROTMAN$
DYNAMIC = YES
PRIORITY = NETBEUI

[NETBEUI_XIF]

Drivername = netbeui$
SESSIONS = 6
NCBS = 12
BINDINGS = "LMNDIS_NIF"
LANABASE = 0

[LMNDIS_NIF]
; protocol.ini session for multifunction
LAN/MODEM driver.

IOADDRESS = 0x320
INTERRUPT = 11
DRIVERNAME = LMNDIS$

Installation 5

Packet Driver Installation

1. Insert the driver diskette into the floppy drive and set to the appropriate drive
(A:\). Then type

INSTALL

and press

Enter

.

2. Select

3. Check the card settings. If current settings are correct, select

4. Select the appropriate values then press

5. The installation program will install the drivers and modify the

6. Now, the installation is completed.

7. Reboot your computer and the new settings will take effect.

Packet Driver

and go to step 5. Otherwise, select

to exit.

AUTOEXEC.BAT

from the menu screen.

directory. Select

Modify Parameters

Enter

. When you are finished, press

Yes

then press

Enter

Start Installation

to change settings.

to modify the files.

Windows for Workgroups 3.11 Installation

1. Insert the driver diskette into the floppy drive and set to the appropriate drive
(A:\). Then type

2. Select

3. If current settings are correct, select

4. Move the cursor to the setting you wish to change, then press

5. Select

Windows for Workgroups

Otherwise, select

configuration is accepted, press
back to step 3.

NDIS Server (LAN Manager,...)

to then press

INSTALL

Modify Parameters

Enter

.

and press

Enter

.

from the Network Operating System screen.

Start Installation

to make modifications.

Enter

from the OK field to exit the screen and go

as the network server that you will attach

and go to step 13.

Enter

. When the

OK

6. The installation program will install the drivers and modify the
AUTOEXEC.BAT directory. Select

7. Run Windows for Workgroups and click on the
Network group.

8. From the Network Settings dialog box, click
operating system.

9. From the Networks dialog box, choose the
selection and
Network Settings screen.

10. Click the

6 Installation

No Additional Network

Drivers...

button to select the network driver.

Yes

then press

Install Microsoft Windows Network

selection. Click OK to go back the

Enter

Network Setup

Networks...

to modify the files.

to select the network

icon in the

11. From the Network Drivers dialog box, press the Add Adapter... button to enter
the Add Network Adapter dialog box. Select Unlisted or Updated Network
Adapter and click OK.

12. Windows will prompt a Install Driver dialog box; put the driver diskette into
floppy drive then press OK.

13. Select Enhanced mode NDIS3 for.... then press OK.

14. Follow Windows instructions to complete the installation and exit Windows.

15. Reboot your computer and the new settings will take effect.

Windows NT 3.51 Installation

1. Choose Program Manager, Main, Control Panel, Network and remove all
existing network components. Remove all adapters first, then servers, then
workstations, etc.

2. Choose Program Manager, Main, Control Panel, Ports and remove all serial
port support. After all serial port devices are removed, press Close.

Adding PCMCIA to Your Laptop

1. Choose Program Manager, Main, Control Panel, Devices.

2. Select PCMCIA.

3. Press STARTUP.

4. Select BOOT, then press OK.

5. When all PCMCIA adapters are added, press Close and restart Windows. Check
the Event Viewer after your system reboots.

Ethernet + Fax/Modem PC Card Installation for NT 3.51

1. Insert the Ethernet + /Fax/Modem multifunction PC Card into one of the
PCMCIA slots.

2. Choose Program Manager, Main, Control Panel, Network.

3. Press YES to install network components.

4. Enter the correct path for NT installation media (CD-ROM). For example,
D:\i386.

5. Press “Do not detect for the network adapter”.

6. Open the Network Adapter Card selection box.

7. Select <OTHER> REQUIRES DISK FROM MANUFACTURER and click
the CONTINUE button.

Installation 7

8. Insert the driver disk into floppy disk drive, then enter the correct path (A:\).

9. Select Ethernet + Fax/Modem PC then click OK.

10. Set the appropriate system resources for the Ethernet + Fax/Modem PC Card.
Make sure the settings you choose do not conflict with any other devices.

Resource Recommendations

I/O Base I/O:300. Possible alternative: 320, 340, 360
Interrupt

(IRQ)
Base Memory D000. Possible alternative: D800
COM Port COM2 to COM4. Select one of the COM port that is not in

11. When all settings are completed, press OK.

Windows NT will load network and grant configurations for:

-NWLink

-TCP/IP

-Netbeui

Typically configurations for each network are unique. Ask your network
administrator for help if you want to change them.

12. Once all network software is loaded, press OK. The configuration and bindings

for the PC Card might ask for confirmation. Answer any questions accordingly.

13. Connect to your network using the provide 10BaseT cord with 8-pin RJ-45 plug.

14. Reboot the system.

IRQ:5. If your laptop is equipped with multimedia devices, a
higher interrupt (IRQ:11) may be needed.

use by other communication devices.

Windows NT4.0 Installation

1. Remove all existing PC Cards from the system.

2. Run Windows NT 4.0

3. Login with a full access level i.e. ADMINISTRATOR.

4. Choose My computer, Control Panel, Network, Adapters and remove all
existing network components.

5. Click CLOSE after all network components have been removed.

8 Installation

6. Choose My computer, Control Panel, Ports and remove all existing network
components.

7. Press CLOSE after all serial port devices are removed.

Ethernet + Fax/Modem PC Card Installation for NT 4.0

1. Insert the Ethernet + Fax/Modem PC Card into a PCMCIA Slot.

2. Start Windows NT 4.0.

3. Login with a full access level i.e. ADMINISTRATOR.

4. Choose My computer, Control Panel, Network.

5. If a Network has not been installed select YES to start Network installation, then
press Next and press SELECT FROM LIST button, then press HAVE DISK
button.

6. Insert the Ethernet + Fax/Modem driver disk into the floppy drive, then enter the
correct path.

7. Select the only choice for the Ethernet + Fax/Modem PC Card, then press OK and

NEXT.

8. Windows NT 4.0 will grant configurations for:

-- TCP/IP

-- NWLink IPX/SPX

-- NetBEUI

...
Typically configurations for each network are unique. Ask your network administrator

for help if you want to change them.

9. Click Next twice to use default NETWORK SERVICES settings.

10. Enter the correct path for NT 4.0 system source files.

11. A dialog box will pop up. Give appropriate system resources to the Ethernet +
Fax/Modem PC Card; the settings must be unique for this device. Refer to
“Resources Recommendation” for NT 3.51 details.

12. Click NEXT twice. Enter COMPUTER NAME then press NEXT.

13. Click FINISH.

If Network has been installed

1. Choose My computer, Control Panel, Network, Adapters.

2. Click ADD to add network adapters.

Installation 9

3. Click the HAVE DISK button.

4. Insert the Ethernet + Fax/Modem PC Card driver disk into floppy drive.

5. Enter the correct path for Windows NT 4.0 drivers then press OK.

6. A dialog box will pop up. Give appropriate system resources to the Ethernet +
Fax/Modem PC Card; the settings must be unique for this device. Refer to
“Resources Recommendation” for NT 3.51 details.

7. Press OK when all setting are complete.

8. Press CLOSE to complete NETWORK setting.

9. Reboot Windows NT.

Modem configuration for NT 4.0

1. Choose My computer, Control Panel, Modems.

2. Press NEXT.

3. From the Modem manufactures & Models list screen, choose your modem and
click FINISH and then CLOSE to complete the modem configuration.

4. Reboot the system.

Windows 95 Installation

1. Windows 95 should automatically detect new hardware. From the New
Hardware Found dialog box, select Driver from disk provided by hardware
manufacturer.

2. Enter the correct path, i.e. “A:\”, then insert Ethernet + Fax/Modem PC Card
driver disk. The driver will be installed automatically, and system may ask for the
Windows 95 installation CD/disks to update the existing files or drivers. After the
update, system will reboot automatically.

3. After installation is complete, My computer, Control Panel, Network to add
Protocols according to your application requirements.

4. Reboot the machine to complete the installation.

Artisoft Lantastic 6.0 Installation

1. Install LANTASTIC 6.0.

2. Run INSTALL.EXE in the Ethernet + Fax/Modem multifunction PC Card driver
disk‘s root directory.

3. Select LANTASTIC 6.0 from the Network Operating System screen, then enter
Driver Install screen.

10 Installation

4. If current settings are correct, select Start Installation and go to step 6.
Otherwise, select Modify Parameters to make changes.

5. Move the cursor to each field you want to make modification and press Enter to
set the correct values. Click Enter, then OK.

6. After installation is complete reboot the computer to have new settings take
effect.

Installation 11

12 Installation

3

This chapter covers the basic commands and techniques involved in modem operation.
In many cases, this is the only information you will need in order to get your Comet up
and running with communication software, and to start making connections with your
Comet.

Basic Modem Operation

Understanding AT Commands

The Comet communicates asynchronously with computers using AT commands. AT
commands are used to configure and control the Comet. Commands are usually sent to
the modem by way of communication software, but can also be entered manually with
the computer keyboard.

Command statements must be written in a specific form in order for the Comet to
recognize them. A command statement always begins with the letters AT or at. It is
then followed by one or more commands and the <Enter> key.

AT commands can only be issued when the Comet is in “command mode” or “off-

”

line.
Once the Comet has established a connection with another modem it is said to be “on-

line” or in “data mode.” In this mode, the characters sent to the Comet by your
computer are transmitted to the remote modem rather than being interpreted by the
Comet as commands.

Using the Windows 95 Hyper Terminal Program

In order to issue an AT command statement, you first need to run a communication
program such as the Microsoft Windows “Hyper Terminal” program. This program
provides a simple method to manually enter AT commands so you can do such things
as “customize” the settings of your Comet, or store phone numbers you will commonly
connect to.

Once the Comet is connected to your computer’s serial port and telephone line, Open
the Windows 95 “Accessories” program group, and open the Hyper Terminal
Program.

The program will prompt you for a name and Icon to use for your new connection.
Type the name Test Connection and press <Enter>.

Next, you will be prompted for country information, area code, and phone number,
and the device used to make the connection. For this test purpose, do not enter a phone
number; simply choose the COM port your Comet is connected to from the “Connect
Using” list. Click “OK” when finished.

Basic Modem Operation 13

The next window sets the COM port settings. The settings used for the Comet should
be as follows:

Bits per second: 115200
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: Hardware

Click “OK” when finished. After you have done this, save your new connection by
selecting “Save” from the “File” menu and click “OK.” A new connection icon will be
added to your Hyper Terminal folder.

You are now ready to start entering AT commands.
In the terminal window, type:

AT<Enter>

Comet responds

OK

This confirms that the modem and your computer are communicating correctly.
To test the telephone line connection issue the manual answer command.
Type:

ATA<Enter>

The Comet will pick up the phone line, and try to communicate. Normally, this
command is only used to answer an incoming call made from another modem. Thus
the high pitched noise you will hear from the speaker. To abort the operation, press
any key, or select “Disconnect” from the “Call” menu.

Dialing and Answering Techniques

Depending on what communications software you use to make modem connections,
you may not have as much control of how the modem dials the telephone number. This
section shows some useful examples of the AT commands used for dialing and
answering operations. The command characters specific to each function are shown in
bold type.

Dialing using the ATD Command

Touch Tone Dialing: ATDT 555 1212
Pulse Dialing: ATDP 555 1212
Tone and Pulse Dialing: ATDP 555 1212 WT 24

14 Basic Modem Operation

Pausing During Dialing: ATDT 9,,555 1212
Dialing Without Waiting for Dial Tone: ATX0D, 555 1212
Originating a call using an Answer Tone: ATDT 555 1212,,,,,,R
Redialing the Last Number Called: ATDL
Waiting for Five Seconds of Silence: ATDT 800 555 1212 @

123456,1 714 555 1212

Transferring a Call (using flash hook): ATDT! 2468

Auto-Answer and Hook Controls

Enabling Auto-Answer: ATS0=n

Note: In this example, n is a number from 1 to 255 that corresponds to the
number of rings after which your modem answers an incoming call.

Disabling Auto-Answer: ATS0=0
Manually Answering a Call: ATA
Take modem off-hook: ATH1
Hang up modem (on-hook): ATH0
Manually Disconnecting a Call: +++ATH

Making Your First Connection

Use the connection you created in the Hyper Terminal program to dial the ZyXEL
BBS. If you are using a different terminal program, run the program according to the
instructions provided with it.

Start the terminal program by double-clicking the Test Connection icon. When the
terminal window appears, enter the dial command with ZyXEL’s BBS
([phone]) as the phone number.

Type:

ATDT<Phone number> <enter>

The modem will go off-hook, dial the number, and after a few seconds of negotiation
tones, you should be connected to our BBS.

You will receive a login message asking for your name. For the purposes of this
example you need not continue. Just click the “disconnect” icon on the toolbar.

Quick Tips when issuing AT Commands

• The ENTER or RETURN key must be pressed to execute a command.

Basic Modem Operation 15

• Multiple AT commands can be combined into one line. For example, AT&D2 and
AT&K0 can be combined into one line AT&D2&K0.

The Comet processes commands from left to right. The AT command that appears to
the right might over-write the command to the left if they are trying to accomplish
tasks or set modes that cannot coexist.

• If you see duplicated characters for each one you type, your Comet and software
both have their “echo” feature turned. The Comet command echo state is switched
off using ATE0 and on using ATE1 (default). To eliminate the double characters,
turn off the software’s command echo rather than using the ATE0 command. If
you see no characters in your terminal window when you type, the modem’s echo
setting is probably set to off. In this case, issue the ATE1 command.

• When a command is successfully issued and accepted, a modem responds with
what is called a “Result Code.” The Comet supports both “verbose” result codes
(i.e. “OK”), and “numerical” result codes (i.e. “0").

You can use the ATV command to set it one way or the other as follows:

Command Description

ATV0 Select numerical result code
ATV1 Select verbose result code

There are a few basic commands that do not require the “AT” command prefix. These
are as follows:

Command Description

A/ Repeats the last issued AT command once
<any key> Terminates the current connection attempt, if pressed

while modem is handshaking.

+++ Escape code sequence. Entered while the modem is

in Data Mode. Returns modem to Command Mode.

The Comet supports several groups of AT commands:

AT Command Set/Type Example

Basic AT commands (compatible) ATB0
Extended AT& commands AT&D0
Extended AT\ commands AT\N3
Extended AT% commands AT%C1
Extended AT- commands AT-C0
S-Register command ATS0=1
S-Register inquiry command ATS0?

16 Basic Modem Operation

Modem Result Codes

When you execute or try to execute an AT command, your modem sends a result code
to let you know whether the command was executed. An OK result code means the AT
command you sent was executed. If you receive an ERROR code, it means the
command was invalid.

The Comet also provides result codes that show:

• Whether or not a Dial Tone was detected when the modem originated a call.

• If a busy signal was detected when the modem originated a call.

• The speed, protocol, and error control/data compression method used.

• If your modem has detected an incoming ring.

Result codes can originate from any of eight result code sets. The
command lets you choose which set of result codes your modem uses. By default, your
modem uses result codes equivalent to the

ATX4

and

ATW2

ATX

command.

n and

ATW

n

Viewing S Register Values

Status registers (or "S-registers") contain values that determine the modem’s operating
characteristics. Whenever you send an AT command to your modem, you are actually
changing the value of an S-register.

You can use the Sr? command to view the value of S-register ‘r’. For example, to
view the value of S-register S0, which controls auto-answering, type ATS0? and press
Enter. The modem responds with a three-digit character showing the value of this
register, followed by OK. A value of 002, for example, means your modem will auto­answer incoming calls after the second ring.

Changing S Register Values

You can use the
For example, to have your modem auto-answer an incoming call after two rings, set S-

register 0 to 2. Be sure the n value is between 1 and 255. If n is set to 0, your modem
will not answer incoming calls.

ATSr=

n command to change the value of an S-register r.

Non-Volatile Memory

The Comet has memory set aside for storing user information such as frequently used
phone numbers and default command settings. This section covers the topics of storing
phone numbers, and saving default settings in the power-on profile.

Storing Phone Numbers

The AT command to store a phone number is in the format

AT&Zs=

Basic Modem Operation 17

n.

The ‘s’ is a number from 0 to 3 that represents the location in memory that the phone
number is to be stored, and the ‘n’ is the phone number itself.

Example: To store the number ‘1-714-555-1212’ in memory location ‘2’, type:

AT&Z2=17145551212<Enter>

You can store up to 4 telephone numbers.

Dialing Stored Phone Numbers

The AT command syntax used to dial a store number is
The ‘n’ is the memory location of the stored number you want to dial.

Note: As a general rule, when a letter in an AT command definition is shown in italic

type, the letter is not to be entered as part of the command, but rather is
representative of a number or string expected as input. For example: The letter

‘S’

in the ATDS=n command is actually typed, unlike the

command which represents a number.

ATDS=

n.

‘s’

in the AT&Zs=n

Saving Settings and User Profiles

There are some cases where you may wish to save the settings you have made as the
default settings that are recalled when the Comet is powered up. The
command stores the current settings as the power-on profile.

The following table lists the syntax for the command involved in storing, recalling,
and viewing the profile settings.

AT&V Views the current settings and the stored phone numbers
AT&W Stores the current settings in user profile
ATZ Resets the current settings with the settings in profile
AT&F Resets the current settings with the factory settings

AT&W

Default Modem Settings for PC’s

The Comet factory settings are configured for operation with PC type computers and
communications software. In most cases, no additional settings will be required. The
following are some of the default settings that are used for operation with PC
computers and software:

AT
Command

E1 Echoes command characters

&C1 Carrier detect follows remote carrier

&D2 Modem disconnects on DTR on-to-off transition

\N3 Use both V.42 and MNP error correction

18 Basic Modem Operation

Description

AT

Description

Command

%C1 Use both V.42bis and MNP 5 data compression

Basic Modem Operation 19

20 Basic Modem Operation

4

AT Command Set Summaries

Basic AT Command Set

Command Options Function & Description

A/ Re-execute the last command string
<any
key>

All the following commands require an “AT” prefix

A Go off-hook and attempt to establish a connection without waiting for a

Bn Line modulation options

B0 Select V.22 m ode for 1200 bps connection
B1 * Select Bell 212A for 1200 bps connection
B2 Select V.23 1200 bps for receiving, 75 bps for transm itting in originate

B3 Select V.23 75 bps for receiving, 1200 bps for transm itting in originate

B15 Select V.21 for 300 bps connection
B16 Select Bell 103 for 300 bps connection

Dn Dial command, beginning the dialing sequence. The string “ n” (telephone

L Re-dial last number. Should be the first character following ATD,

P Pulse dial.
R Reverse dial. Originate call in answer mode (go on-line in answer mode)
S=n Dial the phone number stored in NVRAM at location “n” (n=0, 1, 2, 3)
T DTMF tone dial.
W Wait for second dial tone. The modem waits for the second dial tone

, Pause. Cause the modem to pause for a time before processing the next

! Hook Flash (for call transfer). Cause the modem to go on-hook for 0.5

@ Wait for 5 seconds of silence after dialing number
; Return to command state after dialing a number without disconnecting

En AT command echo options

E0 Echo disabled
E1 * Echo enabled

Hn Switch-hook control

H0 * Modem goes on-hook
H1 Modem goes off-hook

Mn Speaker control

M0 Speaker always off
M1 * Speaker on until carrier present

Terminate the current connection attempt when entered in handshaking
state

ring

mode; 75 bps
for receiving and 1200 bps for transmitting in answer mode

mode; 1200 bps for receiving and 75 bps for transmitting in answer mode

number and modifiers) listed as follows is entered after the “D”
command

ignored otherwise

before processing the dial string

character in the dial string (specified by S8 register)

second then return to off-hook

the call

AT Command Set Summaries 21

Command Options Function & Description

M2 Speaker always on
M3 Speaker off during dialing and on until carrier present

Nn Select negotiate handshake

N0 When originating or answering, handshake only at the communication

N1 * When originating or answering, start handshaking only at the

On Go on-line

O0 Return modem to a previously established state (return to data mode).
O1 Begin an equalizer retrain sequence, then

O3 Force modem to a new rate defined by user

P Enable pulse dialing
Qn Result code display options

Q0 * Result code enabled

Q1 Result code disabled
T Enable tone dialing
Vn Result code form

V0 Display result code in numeric form (see

V1 * Display result code in verbose (text) form
Wn Select extended result code options

W0 CONNECT result code reports DTE speed. Disable protocol result codes.

W1 CONNECT result code reports DTE speed. Enable protocol result codes.

W2 * CONNECT result code reports DCE speed. Enable protocol result codes.
Xn Select result codes/call progress options

X0 Display CONNECT or “1” for all speeds.

X1 Display connect message and the modem’s data rate, and an indication of

X2 Display connect message and the modem’s data rate, and an indication of

X3 Display connect message and the modem’s data rate, and an indication of

X4 * Display connect message and the modem’s data rate, and an indication of

X5 Same as X4.

X6 Same as X4.

X7 Display CONNECT or “1” for all speeds.

Zn Recall stored profile

rate specified by S37 register and “ATBn” and no fallback

communication standard specified by S37 register and “ATBn” During
handshake, fallback to a lower speed may occur.

return to on-line state.

New rates are defined in S62 register.

also the result code options table)

(see also the “Result Code Options Table”)

Ignore dial tone and busy tone detection.

the modem’s error correction and data compression.
Ignore dial tone and busy tone detection.

the modem’s error correction and data compression.
Check dial tone before proceeding dialing,
ignore busy tone detection.

the modem’s error correction and data compression.
Ignore dial tone before proceeding dialing,
check busy tone after making dialing.

the modem’s error correction and data compression.
Check dial tone and busy tone.

Check dial tone and busy tone.

22 AT Command Set Summaries

Command Options Function & Description

Z0 Reset and recall user profile 0. Either Z0 or

* Manufacturer default

Z1 restores the same single profile.

Extended AT& Command Set

Command Options Function & Description

&Cn Data carrier detect option

&C0 State of carrier from remote modem is ignored. DCD circuit is always on

&C1 * DCD turns on when the remote modem’s carrier signal is detected, and

&Dn Data Terminal Ready (DTR) option.

&D0 DTR ignored

&D1 Go to command mode on on-to-off DTR transition

&D2 * Hang up and go to command m ode on on-to-off DTR transition. Auto-

&D3 Hang up and reset from user profile 0 on the on-to-off DTR transition
&F Recall factory default setting as active configuration
&Gn V.22bis guard tone option

&G0 * No guard tone

&G1 550 Hz guard tone

&G2 1800 Hz guard tone
&Kn Set local flow control

&K0 Disable flow control

&K3 * Enable bi-directional hardware flow control (CTS/RTS )

&K4 Enable bi-directional software flow control (XON/XOFF)
&Pn Pulse dialing make/break ratio selection

&P0 Make=39%, Break=61%, international version (Default)

&P1 Make=33%, Break=67%, international version

&Qn Async communications mode options

&Q0 Async mode, buffered (same as “AT\N0”)

&Q5 * Error control mode, buffered (same as “AT\N3”)

&Q8 MNP error control mode. If an MNP error control protocol is not

&Q9 V.42 or MNP error control mode. If neither error control protocol is

&Sn Data Set Ready (DSR) option

&S0 * DSR always on

&S1 DSR on during handshake and on-line, off in test mode or idle mode
&Tn Self-test commands

&T0 Terminate any test in progress

&T1 Local analog loopback test

&T3 Local digital loopback (LDL) test

&T6 Remote digital loopback test
&V View active file and stored phone numbers

off when the carrier signal is not detected.

answer is disabled if DTR is low

Make=33%, Break=67% for use in 20 pps, Japanese version

Make=33%, Break=67% for use in 10 pps, Japanese version (Default)

established, the modem will fallback according to the current setting in
S36 register.

established, the modem will fallback according to the current setting in
S36 register.

AT Command Set Summaries 23

Command Options Function & Description

&W Store active configuration into the modem’s NVRAM
&Zn=x Store telephone number

* Manufacturer default

n=0 to 3

x=<string> see also the dial modifier
in ”ATDn” command
The maximum number of digits per string is 40.

Extended AT\ Command Set

Command Options Function & Description

\Jn Constant DTE speed option

\J0 * DCE and DTE rates are independent
\J1 Force the DTE interface speed to the DCE connection rate (line speed)

\Nn Error control mode options

\N0 Buffered mode, no error control (flow control is allowed).
\N1 Direct mode, no error control (no flow control is allowed).
\N2 MNP reliable mode. If MNP 2-4 error control establishment fails, the

\N3 * V.42, MNP or buffer mode. The modem attempts to connect in V.42

\N4 V.42 or disconnect. The modem attempts to connect in V.42 mode. If this

\Qn Local flow control options

\Q0 Disable flow control (same as “AT&K0”)
\Q1 XON/XOFF software flow control (same as “AT&K4”)
\Q3 * RTS/CTS hardware flow control (same as “AT&K3”)

\Tn Set inactive timer (for buffer mode only)

n=0 * Disable inactive timer
n=1 ­255

\Vn Protocol result codes

\V0 Disable protocol result code appended to DCE speed
\V1 * Enable protocol result code appended to DCE speed

* Manufacturer default

after on-line

modem disconnects.

mode. If this fails, the modem attempts to connect in MNP mode. If this
fails, the modem connects in buffer mode.

fails, the call will be disconnected.

Enable inactive timer. Length in minutes

Extended AT% Command Set

Command Options Function & Description

%B View numbers in blacklist. If blacklisting is in effect, this command

%Cn Data compression control

%C0 No data compression
%C1 * V.42bis/MNP 5 data compression enabled.

* Manufacturer default

24 AT Command Set Summaries

displays the numbers for which the last call attempted in the past two
hours failed. The ERROR result code appears in the countries that do not
require blacklisting.

Extended AT- Command Set

Command Options Function & Description

-Cn Data calling tone options

-C0 * Disable data calling tone

Manufacturer default

•

-C1 Enable data calling tone (the freq. is 1,300 Hz with a cadence of 0.5 sec.
ON and 2 sec. OFF)

AT Command Set Summaries 25

26 AT Command Set Summaries

5

Register Dec. Function & Description Default

S0= 0 - 255 Set the number of the rings required before the modem

S1= 0 - 255 Count the incoming rings and store the value to this register.

S2= 0 - 255 S2 holds the decimal value of the ASCII character used as

S3= 0 - 127 Hold the decimal value of the Carriage Return <CR>

S4= 0 - 127 Hold the decimal value of the character recognized as a line

S5= 0 - 32,

S6= Set the length of time, in seconds, that the modem must wait

S7= Set the time, in seconds, that the modem must wait before

S8= 0 - 65 Set the time, in seconds, that the modem must pause when

S10= 1 - 255 Set the length of time, in tenths of a second, that the modem

S11= 50 - 150 DTMF duration and inter digit delay. Set the duration and

S12= 0 - 255 Define the maximum period, in 2-hundredths of a second,

S28= 0 - 255 V.34 modulation en-/disabler. 0: disabled. 1- 255: enabled. 001
S30= 0 - 90 Inactivity timer. Set the length of time, in minutes, that the

S36= Negotiation fallback options. 007

Status Registers & Result Codes

automatically answers a call. Set “S0=0” to disable auto­answer mode.

The value of this register is incremented with each ring. If no
rings occur over an 8 sec. interval, this register is cleared.
User can read but should not change this value.

the escape character. The default value (043) corresponds to
an ASCII character “+”. A value of 128 to 255 disables the
escape process, i.e., no escape character will be recognized.

character used as the command line and result code
terminator. Pertain to asynchronous operation only.

feed. The line feed control character is output after the
carriage return control character if verbose result code are
used.

127

2 - 65 For international version. 002
4 - 65 For Japanese version. 004

1 - 255 For international version. 050
35 - 59 For Japanese version. 050

Hold the decimal value of the character recognized as a
backspace. The modem will not recognize the backspace
character if this register is set to a value greater than 32.

(minimum 2 seconds even if the value is less than 2) after
going off-hook before dialing the first digit of the telephone
number.

hanging up because carrier is not detected.

the “,” dial modifier is encountered in the dial string.

waits before hanging up after a loss of carrier.

spacing, in mini-seconds, in DTMF touch tine dialing.

allowed between consecutive asynchronous escape character
“+” (plus) for the escape sequence to be considered valid.

modem counts when there is no data flow in or out the DTE
serial port. A connection is disengaged when the counter
reaches the preset value. Set S30 =0 to disable the inactivity
timer. For buffer mode only.

000

000

043

013

010

008

002

020

095

050

000

Status Registers & Result Codes 27

Register Dec. Function & Description Default

0, 2 Hang up.
1, 3 Fall back to an async connection.
4, 6 Attempt MNP mode. If MNP fails, hang up.
5, 7 Attempt MNP mode. If MNP fails, fallback to async

S37= Desired DCE speed (line speed). 000

0 Maximum modem speed.
2 Attempt 1200/75 bps connection.
3 Attempt a 300 bps connection.
5 Attempt a 1200 bps connection.
6 Attempt a 2400 bps connection.
7 Attempt a 4800 bps connection.
8 Attempt a 7200 bps connection.
9 Attempt a 9600 bps connection.
10 Attempt a 12000 bps connection.
11 Attempt a 14400 bps connection.
12 Attempt a 16800 bps connection.
13 Attempt a 19200 bps connection.
14 Attempt a 21600 bps connection.
15 Attempt a 24000 bps connection.
16 Attempt a 26400 bps connection.
17 Attempt a 28800 bps connection.
18 Attempt a 31200 bps connection.
19 Attempt a 33600 bps connection.

S38= 56K Dial Line Rate Options. Set to maximum downstream

0 56K disabled.
1 56K enabled. Auto speed selection, max modem speed.
2 32000 bps
3 34000 bps
4 36000 bps
5 38000 bps
6 40000 bps
7 42000 bps
8 44000 bps
9 46000 bps
10 48000 bps
11 50000 bps
12 52000 bps
13 54000 bps
14 56000 bps

S48= 7, 128 LAPM error control and feature negotiation.

connection..

001

speed at which the modem attempts to connect.

S48=7 Negotiation enabled
S48=128 Negotiation disabled. Force
immediate fallback options
specified in S36
S36=0 or 2, and S48=7

LAPM or hang up

S36=0 or 2 and S48= 128

28 Status Registers & Result Codes

Register Dec. Function & Description Default

Don’t use

S36=1 or 3, and S48=7

LAPM or async

S36=1 or 3, and S48=128

Async

S36=4 or 6, and S48=7

LAPM, MNP or hang up

S36=4 or 6, and S48=128

MNP or hang up

S36=5 or 7, and S48=7

LAPM, MNP or async

S36=5 or 7, and S48=128

MNP or hang up

S89= 0, 5 - 60 Sleep mode control timer. Specify the number of seconds of

inactivity (no character sent from DTE, no RING) in the off­line command state before the modem places itself into
standby mode. A value of “0” prevents standby mode.
If a number between 1 and 4 is entered for this register, it
will set the value to 5.

S91= 6 - 15 Transmitting power level adjustment (Japanese version only)

Range: -6 dBm to -15 dBm
Default: -15 dBm

030

014

Result Code Options

Result Code Options Table

ATV0 ATV1 X0 X1 X2 X3 X4 X7

0OK
1 CONNECT
2 RING
3 NO CARRIER
4 ERROR
5 CONNECT 1200 EC* @ @ @ @
6 NO DIAL TONE
7BUSY
8 NO ANSWER
10 CONNECT 2400 EC * @ @ @ @
11 CONNECT 4800 EC * @ @ @ @
12 CONNECT 9600 EC * @ @ @ @
13 CONNECT 14400 EC * # # # #
14 CONNECT 19200 EC * @ @ @ @
18 CONNECT 57600 EC * % % % %
24 CONNECT 7200 EC * # # # #
25 CONNECT 12000 EC * # # # #
28 CONNECT 38400 EC * % % % %
40 CONNECT 300 EC * @ @ @ @
55 CONNECT 21600 EC * # # # #
56 CONNECT 24000 EC * # # # #
57 CONNECT 26400 EC * # # # #
58 CONNECT 28800 EC * # # # #

99 9999
99 9999
99 9999
99 9999
99 9999

999

999

99 9999

Status Registers & Result Codes 29

ATV0 ATV1 X0 X1 X2 X3 X4 X7

59 CONNECT 31200 EC * # # # #
60 CONNECT 33600 EC * # # # #
70 CONNECT 32000 EC * # # # #
71 CONNECT 34000 EC * # # # #
72 CONNECT 36000 EC * # # # #
73 CONNECT 38000 EC * # # # #
74 CONNECT 40000 EC * # # # #
75 CONNECT 42000 EC * # # # #
76 CONNECT 44000 EC * # # # #
77 CONNECT 46000 EC * # # # #
78 CONNECT 48000 EC * # # # #
79 CONNECT 50000 EC * # # # #
80 CONNECT 52000 EC * # # # #
81 CONNECT 54000 EC * # # # #
82 CONNECT 56000 EC * # # # #
86 CONNECT 16800 EC * # # # #
87 CONNECT 115200 EC * % % % %
88 DELAYED **
89 BLACKLISTED **

90 BLACKLIS FULL **
@ DTE/DCE speed
# DCE speed (line speed)
% DTE speed
* EC only appears when the Extended Result Code options are enabled.
** For Blacklisting function enabled countries only.

Extended Result Code Options Table

ATV0 ATV1 W0 W1 W2 W2\V0

5 CONNECT 1200

5 CONNECT 1200 EC*

10 CONNECT 2400

10 CONNECT 2400 EC *

11 CONNECT 4800

11 CONNECT 4800 EC *

12 CONNECT 9600

12 CONNECT 9600 EC *

13 CONNECT 14400

13 CONNECT 14400 EC *

14 CONNECT 19200

14 CONNECT 19200 EC *

18 CONNECT 57600

18 CONNECT 57600 EC *

24 CONNECT 7200

24 CONNECT 7200 EC *

25 CONNECT 12000

25 CONNECT 12000 EC *

28 CONNECT 38400

28 CONNECT 38400 EC *

99

99

99

99

99

99

99

99

9

9

99

99

9

9

9

9

9

9

99

99

30 Status Registers & Result Codes

ATV0 ATV1 W0 W1 W2 W2\V0

40 CONNECT 300

40 CONNECT 300 EC *

55 CONNECT 21600

55 CONNECT 21600 EC *

56 CONNECT 24000

56 CONNECT 24000 EC *

57 CONNECT 26400

57 CONNECT 26400 EC *

58 CONNECT 28800

58 CONNECT 28800 EC *

59 CONNECT 31200

59 CONNECT 31200 EC*

60 CONNECT 33600

60 CONNECT 33600 EC *

70 CONNECT 32000

70 CONNECT 32000 EC*

71 CONNECT 34000

71 CONNECT 34000 EC*

72 CONNECT 36000

72 CONNECT 36000 EC*

73 CONNECT 38000

73 CONNECT 38000 EC*

74 CONNECT 40000

74 CONNECT 40000 EC*

75 CONNECT 42000

75 CONNECT 42000 EC*

76 CONNECT 44000

76 CONNECT 44000 EC*

77 CONNECT 46000

77 CONNECT 46000 EC*

78 CONNECT 48000

78 CONNECT 48000 EC*

79 CONNECT 50000

79 CONNECT 50000 EC*

80 CONNECT 52000

80 CONNECT 52000 EC*

81 CONNECT 54000

81 CONNECT 54000 EC*

82 CONNECT 56000

82 CONNECT 56000 EC*

86 CONNECT 16800

86 CONNECT 16800 EC *

87 CONNECT 115200

87 CONNECT 115200 EC *
* EC is replaced by one of the following symbols.

V.42bis V.42 error control and V.42bis data compression
V.42 V.42 error control only
MNP5 MNP 4 error control and MNP 5 data compression
MNP4 MNP 4 error control only

99

99

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

Status Registers & Result Codes 31

NoEC No error control and data control protocols

32 Status Registers & Result Codes