MaxTech 28, 800 User Manual

High Performance
V.34 28,800 BPS
Internal F AX/Data
Modem

User's Manual

Contents

Section One Introduction ............................ 1

Section Two Installation .............................. 1

Section Three AT Command Set ................... 6

Section Four S Register Summary ............ 11

Section Five Result Codes.......................... 12

Section Six Troubleshooting .................... 15

Section Seven Specifications ........................ 17

Section Eight Support And Service ............ 17

Section Nine FCC, DOC, Copyright And

Other Notices ........................ 17

Part #MAN018 Rev. 1.0 RC288/R6

Section One - Introduction

The 28.8 Kbps Series FAX/Data Modem products
connect your computer to all popular high speed modems
available today. The modem supports the V.34 protocol to
supply the highest speed connections possible. It also uses
V.42 or MNP 2-4 error correction for flawless connections
and V.42bis or MNP 5 data compression for increased
throughput.

This manual describes the hardware installation proce­dures for your new modem product. Additional information
on AT commands and S-registers are provided so that your
system can be customized for a particular operating environ­ment.

Section Two - Installation

This section will provide step by step instructions on
how to install your new 28.8 Kbps FAX/Data modem.
Installation of this modem product is a two-step process
consisting of actual hardware installation and communica­tion software installation and configuration.

2.1 Unpacking Your Modem

Before you begin your installation, be certain that you
have all the items listed below. This package contains:

• A modem • A telephone cable

• User's manual • Software for the modem

• Software user's manual

2.2 Hardware Installation

Installation of this modem requires opening and ma­nipulating your PC. Exercise caution at all times when
working with AC powered and static-sensitive equipment.
Turn off and unplug your PC before installation. Discharge
any static electricity from your body by touching any metal
surface.

1. Turn off and unplug your computer from the AC outlet.

2. Determine how many serial ports are built into your com-

puter (examine the back of your computer). Refer to Figure
2-1 to identify common serial ports.

3. If you have one or more serial ports on the back of your

computer, reconfigure your modem. Your modem is shipped

1

Figure 2-1 Common Serial Ports

male connector

set to COM1 on IRQ4. Reconfigure the modem to either
COM3/IRQ5 or COM4/IRQ2 (refer to Table 2-1 in Sec­tion 2.4).

4. Remove your computer's cover (refer to your computer's

owner manual).

5. Select any available half-card

slot, and then remove the slot
cover (refer to Figure 2-2).

6. Carefully slide the internal mo-

dem into the slot you have
chosen, applying even pres­sure until the modem is com­pletely seated in the slot.

7. Fasten the retaining bracket

with the screw from the slot
cover. Make sure the modem
is properly aligned. Store the
slot cover for future use.

8. Replace the computer cover and plug in your computer.

9. Connect the telephone cable from the modem (“LINE”

connector) to the telephone wall jack.

10. Optionally, connect your telephone to the modem's

“PHONE” connector.

11. Turn your computer on. Your modem is now installed.

Figure 2-2
Expansion

Slots

2.3 Software Installation/Configuration

You are now ready to install and configure the commu­nication software. Refer to your software manual for instal­lation procedures. Your software must be configured to
communicate with the modem on the same COM port and
IRQ line used by the modem.

If you are using Microsoft Windows 3.x and have
changed the modem's operating setting from the default COM1/
IRQ4 to COM3/IRQ5 or COM4/IRQ2 to avoid a conflict, you
must use Windows' Control Panel (in the “Main” Group
within Program Manager) to configure Windows to recognize
the new settings before installing any software. In Control

2

Panel, double-click on Ports. Click once on the icon for the
Com port you have set your modem to. Click the Settings
button. Click the Advanced button. The Base I/O Port
Address should already be set by Windows to the COM port
address used by the modem (refer to Table 2-1). Change the
Interrupt Request Line (IRQ) to match the IRQ on the
modem. If you have set the modem to COM4/IRQ2, do not

select IRQ2. You will need to set the IRQ in Control Panel to
IRQ9 for Windows to recognize the modem. (In an operating

system designed for 286 or better machines, IRQ 9 is
equivalent (redirected) to IRQ2.)

A modem setting which skips one or more COM port
assignments requires special attention in the Windows 3.x
Control Panel. For example, if your computer is equipped
with two serial ports (COM1 and COM2) and have set the
modem to COM4 instead of COM3, the Control Panel
settings for COM4 may say Default. In this case, Windows

3.x will operate the modem as the third serial device and
recognize it as “COM3” (This unusual COM port reassign­ment does not occur in future releases of Windows). The
correct COM4 address (2E8) has been placed into the
Control Panel COM3 position. Configure the COM3 entry in
Control Panel by changing the IRQ box to match the IRQ that
has been set on the modem. (When running any Windows

3.x-based communication or fax programs, select COM3 as
the COM port for the modem.)

We suggest the following communication parameters
when you first use your data communication software.
Consult the software manual for information on using these
and other parameters/features.

38,400 bps; 8 data bits; no parity; 1 stop bit; RTS/
CTS flow control set to “on;” initialization string:
AT&F

We suggest that a “Generic Class 2” modem type
should be selected in your fax software.

2.4 COM Port and Interrupt Settings

If your computer is equipped with one or more serial
ports, you will need to change the COM Port setting on the
modem (to either COM 3 or 4), or disable the PC's built-in
COM port.

3

An IRQ (interrupt request) is a signal generated by an
I/O device that notifies the computer of incoming data. Your
internal modem is capable of accessing IRQs 2, 3, 4, and 5.

I/O devices in your computer cannot share an IRQ with
another device at the same time. Since IRQs can not be

shared at the same time, COM 3 is generally configured to use
IRQ 5, and COM 4 to use IRQ 2. This avoids sharing of IRQs
with COM 1 (IRQ4) and COM 2 (IRQ3).

To change the default COM Port or IRQ settings from
COM 1/IRQ 4 to another setting, locate the Switch Block on
your internal modem (Figure 2-3). Refer to Table 2-1 to
configure the Switch Block to the COM Port and IRQ
combination needed for your application. Any time the

COM or IRQ setting for the modem is changed, the
settings in the software must be changed to match.

Figure 2-3 Switch Block SW1 Location

SW1

Table 2-1 SW1 Settings

COM Port IRQ SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6

1 (3F8)
default

2 (2F8) 3 OFF ON OFF ON OFF OFF
3 (3E8) 5 ON OFF OFF OFF OFF ON

4 (2E8) 2(9)** OFF OFF ON OFF OFF OFF

* Use these IRQs only if your software can not address IRQ 5 or IRQ 2
** When using Windows with the modem set for IRQ2, select IRQ9 in

Control Panel

4 ON ON OFF OFF ON OFF

4* ON OFF OFF OFF ON OFF

3* OFF OFF OFF ON OFF OFF

4

2.5 Using the Fax Capabilities of the Modem

Your modem has built-in advanced FAX functions.
The commands to control these functions are software driven
and are not normally accessible to the user. Consult your
FAX software manual about procedures on using FAX
features.

2.6 Testing Your Modem After Installation

In order to test your modem you should be familiar
with your communication software. Load and set up your
communication software and enter into “terminal mode.”
Make sure that the COM Port and IRQ settings of the modem
match the software. Type AT on your terminal screen and
press ENTER. You may see “AATT” or nothing on the
screen. In either case, the modem should respond with an OK
or 0. If it does not, please refer to Section 2.4 for information
on COM Ports and IRQ’s or Section 6 for troubleshooting
information.

2.7 Using Your Modem

The communication software included with your mo­dem product provides a user friendly interface to access the
fax and data functions of your modem. This software should
be sufficient for all of your communication needs. There
may be times when you need to access the modem manually
via modem commands. Read Section 3 for a summary
description of the modem command set before manually
accessing the modem. You may want to read the software
manual first, however, as the software may already provide
a user friendly method of accessing the functions you need
(i.e. dialing or answering calls).

2.8 Where To Go From Here

You should familiarize yourself with the functions
available from the included software by reading its manual.
You will be accessing most, if not all, of the modem's
functions from this software. You may also use any other
commercially available communication software with the
modem. Read Section 3 ONLY if you are interested in
accessing the modem manually, and not through the included
software. Section 4 and 5 contain reference material, and can
be skipped. If you have difficulties getting your modem to
work, read Section 6, Troubleshooting to find answers to

5