U.S. Wireless Data USWD500 User manual

USWD500
CDPD Modem
User’s Manual
For CDPD Version 1.1 with UDP/TCP Protocol
Version 3.01
February 5, 1999

FCC Information
The Federal Communication Commission Radio Frequency Interference Statement
includes the following paragraph:
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 radiates radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communication.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or 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 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.
The user should not modify or change this equipment without written approval from
U.S. Wireless Data. Modification could void authority to use this equipment.
WARNING LABEL
This label will be placed on the final product, clearly visible to all persons exposed to the
transmitter. The specific location on the final product will be consistent with each same
final product, but will vary in location across various final products, and in any case will
always be clearly visible to all persons exposed to the transmitter. The physical size of
the label and font size of the lettering will be dependent on the size of the final product,
but in any case will always be clearly visible to all persons exposed to the transmitter.
WARNING LABEL EXAMPLE
While this device is in operation, a separation distance of at least
20 centimeters must be maintained between radiating antennas
and the body of the user or nearby persons in order to meet the
F
CC
RF
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x
posu
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e
gu
i
de
lin
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.

Copyright
Copyright © 1999 U.S. Wireless Data, Inc., all rights reserved. No part of this publication
may be reproduced, adapted, stored in a retrieval system, translated into any language, or
transmitted in any form or by any means without the written permission of U.S. Wireless
Data, Inc.
Trademarks
USWD500 is a trademark of U.S. Wireless Data, Inc.
Limited Warranty
In no event will U.S. Wireless Data, Inc. be liable for any damage, including loss of data or
profits, cost of cover, or other incidental, consequential or indirect damages arising from
the installation, maintenance, use, performance, failure, or interruption of USWD’s
products, for whatever cause and on any theory of liability. This limitation will apply even
if U.S. Wireless Data has been advised of the possibility of such damage.
Technical Support
U.S. Wireless Data, Inc.
Address: 2200 Powell Street, Emeryville, CA 94608-1809
Telephone: [phone]
Fax: [phone]
E-mail: [e-mail]
[e-mail]
[e-mail]
Web Site: http://www.uswdata.com
About This Manual
The USWD500 User’s Manual was first published by U.S. Wireless Data, Inc., in 1997.
This revision is for the USWD500 for CDPD Version 1.1 with UDP/TCP Protocol, issued in
July 1998. This manual provides information for setting up, maintaining, and
troubleshooting the USWD500 CDPD Modem.

USWD500 User’s Manual 0
CONTENTS
Chapter 1 Introduction................................................................................................ 3
Who Should Read this Manual .......................................................................................... 3
Purpose of this Manual ...................................................................................................... 3
General Description and Features .................................................................................... 3
USWD500 Product Package and Services........................................................................ 4
Product Package.................................................................................................................................4
Services ..............................................................................................................................................4
How to Use this Manual ..................................................................................................... 4
Chapter 2 Product Specifications.............................................................................. 5
Hardware Specifications.................................................................................................... 5
General Specifications....................................................................................................... 5
Receiver Specifications ..................................................................................................... 6
Transmitter Specifications................................................................................................. 7
I/O Pin Assignments (FFC Connector).............................................................................. 8
Mechanical Specifications ................................................................................................. 9
Mechanical Size.................................................................................................................. 9
MMCX RF Connector........................................................................................................ 10
FFC 30-pin connector (ZIF) ...............................................................................................11
Chapter 3 Installation and Setup ............................................................................. 12
Initial Setup....................................................................................................................... 12
Verifying the USWD500 Working Status ......................................................................... 12
Connecting to the CDPD Network ................................................................................... 15
Problem Solving Table..................................................................................................................20
General Parameters Setup............................................................................................... 20
IP Address Setup ..............................................................................................................................20
Side Preference Setup......................................................................................................................21
Selecting the Channel Scan Mode ...................................................................................................22
Advanced Parameters Setup ........................................................................................... 23
Serial Port Parameter Setup (Optional) ............................................................................................23
UDP Parameters Setup ....................................................................................................................25
SPI/SPNI/WASI Parameters .............................................................................................................25
S-Registers .......................................................................................................................................26
Sleep Mode Parameters ...................................................................................................................26
Useful Commands............................................................................................................ 26
Quick Connection to the CDPD Network..........................................................................................26
Get Status Command .......................................................................................................................27

USWD500 User’s Manual Version 3.0 - 1 -
ON-LINE/OFF-LINE Mode................................................................................................................28
Using the USWD500 Modem with a Terminal Emulation Program ................................ 28
UDP Concept ....................................................................................................................................28
Data Transmitting and Receiving Under UDP Protocol....................................................................29
When Will the USWD500 Modem Send Out Queued Data?............................................................29
Buffer full.......................................................................................................................................29
S50 Time Out (Data Forwarding Idle Time Out)...........................................................................29
Receive a data forwarding character............................................................................................30
Broadcast and Multicast .................................................................................................. 30
Broadcast..........................................................................................................................................30
Multicast............................................................................................................................................30
Chapter 4 Integration Considerations ..................................................................... 32
Determining End Product Use......................................................................................... 32
Amount and Frequency of Messages Sent/Received .................................................... 32
Hardware Design Considerations ................................................................................... 32
Power Supply Considerations......................................................................................... 33
Identifying the Source Antenna....................................................................................... 33
Setting Up a Development Test Environment................................................................. 33
Developing Software Applications.................................................................................. 33
Performing EMI Testing.................................................................................................... 33
Obtaining Regulatory Approval....................................................................................... 34
Final Assembly Testing.................................................................................................... 34
Installation and Field Testing........................................................................................... 34
Chapter 5 Application Development........................................................................ 35
Scope of Application........................................................................................................ 35
Public Service (Police, Fire, Security)...............................................................................................35
Telemetry ..........................................................................................................................................35
Point of Sale......................................................................................................................................35
Transportation...................................................................................................................................35
On-Line, Point-to-Point Communications .........................................................................................35
Example: Credit Card Verification with the USWD500 Modem...................................... 36
FUNCTION ...................................................................................................................................39
COMMAND...................................................................................................................................39
RESPONSE..................................................................................................................................39
Appendix A AT Command List .................................................................................... 43
AT!A ..............................................................................................................................................46
AT!A0 ............................................................................................................................................46
AT!D..............................................................................................................................................47
AT! Ixxx.xxx.xxx.xxx/ password .....................................................................................................47
AT!I? .............................................................................................................................................47
AT!M .............................................................................................................................................47
AT!M? ...........................................................................................................................................47
AT!R..............................................................................................................................................47
AT!S ..............................................................................................................................................47

USWD500 User’s Manual Version 3.0 - 2 -
AT!S1 ............................................................................................................................................47
AT!T ..............................................................................................................................................47
AT!T0 ............................................................................................................................................47
AT!U..............................................................................................................................................47
AT!U0............................................................................................................................................47
Appendix B S Registers............................................................................................... 49
S-Register Definitions ...................................................................................................... 50
Appendix C USWD500 Response Messages ............................................................. 52
Index............................................................................................................................ 53

USWD500 User’s Manual Version 3.0 - 3 -
Chapter 1 Introduction
Who Should Read this Manual
This manual is designed to assist the application software developer with
installation, testing, and preparing software interfaces for the USWD500 CDPD
Modem. It assumes that the reader has a basic working knowledge of UDP/IP and
the use of the AT Command set.
Purpose of this Manual
The purpose of this manual is to help OEM integrators to successfully reach the
goal of producing a wireless product integrating the USWD500 CDPD Modem. In
this manual, we offer specific technical details, relevant examples, general
principles, and guidelines in an effort to bridge the gap between the various
engineering and business disciplines. Our guiding philosophy is that providing a
top-down, progressive disclosure of information is the best approach to forming a
common understanding of any problems and their appropriate solutions.
General Description and Features
The USWD500 CDPD Modem is the network component by which CDPD network
subscribers gain access to the CDPD network. Support services provided by the
USWD500 include transmission and reception of data across the airlink on a full-
duplex basis, medium access control to the airlink, mobile data link procedures,
subnetwork convergence features, and end-to-end delivery of network-level
packets that are either based on UDP/IP or TCP/IP.
General Features:
¾Compact and lightweight (78.9X48.8X9.8mm and 1.6oz.)
¾Antenna connector (MMCX Type) supports straight or right angle cable plug
¾0.6 WATT transmit power
¾RF protocol: CDPD Specification V1.1
¾30 pin FFC connector interface (.5mm between pins)
¾TX: 824.01MHz~848.97MHz
¾RX: 869.01MHz~893.97MHz
¾30KHz channel spacing

USWD500 User’s Manual Version 3.0 - 4 -
USWD500 Product Package and Services
Product Package
Your USWD500 package contains the following items. Check to make certain all
items are included:
•One USWD500 CDPD Modem
•One USWD500 CDPD Modem User’s Manual
Services
•USWD500 CDPD Modem technical training
•On-site consulting
How to Use this Manual
This manual provides information and assistance for both physical installation and
programming of the USWD500 CDPD Modem.
Chapter 1: Introduction Describes the basic concept of the USWD500
CDPD Modem, the general audience for this
manual, and how this manual should be used.
Chapter 2: Product
Specifications
Provides the hardware specifications, I/O pin
assignments, and mechanical specifications of
the USWD500 CDPD Modem.
Chapter 3: Installation and
Setup
Illustrates the basic information needed to install,
set up, and test the USWD500 CDPD Modem on
the CDPD network.
Chapter 4: Integrating
Considerations
Discusses important issues integrators need for
integration of the USWD500 Modem with their
device.
Chapter 5: Application
Development
Provides additional information for planning and
designing CDPD applications in either the UDP or
SLIP environments.

USWD500 User’s Manual Version 3.0 - 5 -
Chapter 2 Product Specifications
This chapter provides hardware specifications, I/O pin assignments, and mechanical
specifications for the USWD500 CDPD Modem.
Hardware Specifications
This section includes general product specifications for the USWD500 CDPD
Modem, as well as specifications for the receiver and transmitter.
General Specifications
The following table summarizes the general specifications of the USWD500 CDPD
Modem.
Current dissipation RF Part 750mA(Max.)
Digital Part 160mA(Max.)
Power supply DC 5.5V±0.5V
Antenna connector MMCX 50ohm socket
Power/Serial interface connector FFC
Temperature 0 to +45 degrees centigrade

USWD500 User’s Manual Version 3.0 - 6 -
Receiver Specifications
The following table summarizes the receiver specifications of small form factor as
per the FCC Part 409 “Minimum Performance Standards for CDPD Mobile End
Systems” for the United States. All performance standards for CDPD Mobile End
Systems outside the United States also apply.
RF sensitivity -111 dBm@BLER<0.05
RF sensitivity w/ Rayleigh fading -98 dBm, 8km/hr
-100 dBm, 50km/hr
-100 dBm, 100km/hr
Co-channel interference in Rayleigh fading & delay 17dB, 8s
RX adjacent/alternate channel selectivity 16dB @ 30 kHz
60dB @ 60 kHz
RX intermodulation 57 dB
RSSI ±6 dB absolute
±3 dB relative
Radiated & conducted spurious FCC Part15 Specification
for the United States
Forward channel busy/idle flag & decode status flag
decode Failure< .001