US Robotics USR3520, USR803520 User Manual

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USRobotics® Courier® Modemulator™

User Guide & Technical Documentation

Modemulator & 3G M2M Cellular Gateway

For the following products:

USR3520, USR803520

Modemulator Upgrade Kit

USR3516-EMU

R24.0800.01

Rev 2.1 9/24/2015

For firmware version 1.0.02

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Modemulator User Guide

Contents

Contents .................................................................................................................................... 2

About This Guide ......................................................................................................................... 7

Symbols Used In This User Guide ............................................................................................... 7

Important Safety Instructions .................................................................................................... 8

General Recommendations For Use ......................................................................................... 8

Ambient Temperatures .......................................................................................................... 8

Explosive Atmosphere ........................................................................................................... 8

Driving ................................................................................................................................ 9

Medical Equipment ................................................................................................................ 9

ESD Notice ........................................................................................................................... 9

Class A Device ...................................................................................................................... 9

Chapter 1: Features ................................................................................................................... 10

Introduction .......................................................................................................................... 10

Overview of Main Features ................................................................................................... 10

Physical Features ................................................................................................................ 12

Mounting Instructions .......................................................................................................... 14

Chapter 2: Getting Started ......................................................................................................... 15

Verifying Modemulator Operation ............................................................................................. 15

Testing Modemulator Connectivity ............................................................................................ 18

System requirements .......................................................................................................... 18

Set Up Cellular Connectivity ................................................................................................. 18

Configure Modemulator Dialing Directory ............................................................................... 20

Making a Connection ........................................................................................................... 22

Chapter 3: Applications .............................................................................................................. 24

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Convert A Legacy Dial-up M2M System To Cellular ..................................................................... 24

Peer-to-Peer Operation ........................................................................................................ 24

Single-Ended Operation ....................................................................................................... 27

Maintain Compatibility with Dial-up Modems .............................................................................. 30

Chapter 4: Command Reference .................................................................................................. 32

Using the AT Command Set ..................................................................................................... 32

Overview ........................................................................................................................... 32

General rules for using AT commands .................................................................................... 32

Modemulator Memory ............................................................................................................. 33

The Modemulator Base Unit .................................................................................................. 33

The Modemulator Expansion Card ......................................................................................... 33

AT Command Reference Guide ................................................................................................. 34

Basic Commands................................................................................................................. 34

Ampersand Commands ........................................................................................................ 45

Modemulator Commands ..................................................................................................... 50

S Registers ......................................................................................................................... 60

Chapter 5: USR3520/USR803520 Technical Specifications .............................................................. 66

Physical ............................................................................................................................. 66

Serial Port Ratings .............................................................................................................. 66

Power ................................................................................................................................ 66

Radio Technology & Frequency Bands .................................................................................... 68

Max. connectivity speeds ..................................................................................................... 68

GPS ................................................................................................................................... 69

Security ............................................................................................................................. 69

Minimum System Requirements ............................................................................................ 69

Command-line Interface ...................................................................................................... 69

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Graphical User Interface ...................................................................................................... 70

Environmental .................................................................................................................... 70

Enclosure Type ................................................................................................................... 70

Mounting ........................................................................................................................... 70

Package Dimensions/Weight ................................................................................................. 70

Product Dimensions/Weight .................................................................................................. 70

Troubleshooting and FAQs .......................................................................................................... 71

General ................................................................................................................................. 71

What are displayable characters? ............................................................................................. 71

What are programmable characters? ........................................................................................ 71

What are dial modifier characters? ........................................................................................... 71

Can I use the SIM from my phone for Modemulator? .................................................................. 71

What type of screwdriver do I need for installing a SIM or an expansion card? ............................... 72

What is peer-to-peer? ............................................................................................................. 72

What is point-to-point? ........................................................................................................... 72

Can I enable both Caller ID Screening and Password Prompting? ................................................. 72

Can I enable both Caller ID Screening and Dialback Security?...................................................... 72

Why does an originating Modemulator report BUSY? ................................................................... 72

Can I connect to the IP address reported by the USR3520/USR803520? ....................................... 72

How do I configure a Modemulator for connection to the Vodafone UMTS network? ........................ 73

How do I restore the Modemulator expansion card to factory settings? ......................................... 73

Why do I need an M2M data plan with the Modemulator? ............................................................ 74

Can the Modemulator connect simultaneously to several remote sites? ......................................... 75

Can I use the Modemulator to connect to an analog site over the cellular network? ........................ 75

Can the Modemulator be connected to the console port of a Cisco router? ..................................... 75

Glossary of Terms ..................................................................................................................... 77

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Support .................................................................................................................................... 78

Appendicies .............................................................................................................................. 80

Appendix A: ASCII Chart ......................................................................................................... 80

Appendix B: Excessive Data Usage Warning .............................................................................. 82

Appendix C: DTE Interface Requirements .................................................................................. 84

Appendix D: Result Codes ....................................................................................................... 85

Appendix E: ATI6 Disconnect Reasons ...................................................................................... 86

Appendix F: Flow Control ........................................................................................................ 87

Appendix G: Dial Security ....................................................................................................... 88

Overview ........................................................................................................................... 88

Setting Up Caller ID Screening .............................................................................................. 89

Setting Up Password Prompting ............................................................................................ 91

Setting Up Dialback Security ................................................................................................ 93

Appendix H: Remotely Accessing and Configuring the Modemulator .............................................. 96

Overview ........................................................................................................................... 96

Setting Up for Remote Access ............................................................................................... 97

Starting A Remote Access Session ......................................................................................... 97

Ending A Remote Access Session .......................................................................................... 98

Appendix I: Flashing New Firmware into Modemulator Card ......................................................... 99

Appendix J: DB9 Pinouts ....................................................................................................... 102

Terminal Port.................................................................................................................... 102

Modem Port ...................................................................................................................... 102

Appendix K: Peer-To-Peer Cellular Data Service ....................................................................... 103

Appendix L: Leased Line Operation ......................................................................................... 104

Appendix M: Break Sequence Operation .................................................................................. 105

Legal Notice ............................................................................................................................ 106

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Warranty ............................................................................................................................ 107

Regulatory Information ............................................................................................................ 111

FCC Compliance ................................................................................................................... 111

UL Listing/CUL Listing ........................................................................................................... 111

Industry Canada (IC) ............................................................................................................ 111

CE Compliance ..................................................................................................................... 112

WEEE Compliance ................................................................................................................ 112

Copyright Information .............................................................................................................. 113

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About This Guide

This Modemulator User Guide contains operating instructions for the USRobotics Courier Modemulator. It describes the characteristics of the Modemulator when operating in Modemulator mode. For guidance on the Modemulator operating in Gateway mode, refer to the USR3520/USR803520 Gateway User Guide.

Chapter 1 summarizes some of the key features of the Modemulator, and presents its external interfaces.

Chapter 2 explains how to verify that the Modemulator is operational and how to test the cellular

connectivity before installing the Modemulator into specific deployments.

Chapter 3 shows the intended applications of the Modemulator, and describes its operation in those

applications.

Chapter 4 is a detailed listing of the Modemulator command set with examples of command usage.

Chapter 5 lists Modemulator technical specifications.

Symbols Used In This User Guide

This symbol invites the User to read more technical details.

This symbol identifies helpful User information.

This symbol warns the User to stop, read, and understand critical information.

This symbol denotes supplemental information.

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Modemulator User Guide

Please read the following guidelines carefully. Not following these guidelines can cause harm to the gateway, yourself or other persons.

RF EXPOSURE WARNING

A minimum distance of 20cm must be maintained between the user's body and the device antennas.

Important Safety Instructions

General Recommendations For Use

 do not open your product when powered.  do not expose to liquid, moisture or humidity.  do not drop, throw or try to bend your product.  do not paint your product.  do not touch the antenna unnecessarily.

Ambient Temperatures

Do not operate your product at ambient temperatures beyond the range of -30 and +70 degrees Celsius (exception: PoE functionality is limited to 45°C when using more than 30W). When using an AC adapter make sure that the ambient temperature doesn’t exceed the specified temperature limits of the AC adapter.

In restricted areas, such as dedicated equipment rooms or electrical closets, where the temperature can exceed 65°C, the temperature of the surface might reach high values and therefore under these conditions the products need to be protected against accidental contact. We recommend that operators who plan to use this product at these high temperatures stick a warning sticker, in accordance with IEC 60417-5041 (DB:2002-10), on a visible part of the device, or attach a sticker with the following text:

WARNING

HOT SURFACE DO NOT TOUCH

Explosive Atmosphere

Turn off your device in any area with a potentially explosive atmosphere. It is rare, but your device could generate sparks, which could cause an explosion or fire. Areas with a potentially explosive atmosphere are

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not always clearly marked. They include fueling areas (petrol filling stations), below deck on boats, fuel or chemical transfer or storage facilities and areas where the air contains chemicals or particles, such as grain, dust, or metal powders. Do not transport or store your product in the compartment of a vehicle which contains flammable gas, liquid or explosives.

Blasting Areas – Construction Sites

Turn off your product when in a blasting area in order to avoid interfering with two-way radios used in blasting operations.

Do Not Use On Aircraft

Using wireless devices on aircraft can cause interference. Do not use it when the plane is on the ground without permission from the aircraft crew.

Driving

Do not operate your device while driving. Park the vehicle first.

Medical Equipment

Do not use near medical equipment, especially life support equipment that might be susceptible to radio interference.

ESD Notice

Electrostatic Discharge (ESD) is caused by a buildup of static electricity and can happen when making contact with a product. To limit the likelihood of Electrostatic Discharge, it is recommended to:

 avoid conditions that result in high static electricity (carpet, cool and dry air,…);  avoid touching any connectors when handling the unit; only touch the casing if possible;  ground yourself prior to handling by touching a large metal object.

In case the product encounters loss of performance after an Electrostatic Discharge, please reset the device in order to restore it to normal functionality.

Class A Device

This is a Class A product. In a domestic environment this product may cause radio interference in which case the User may be required to take adequate measures. The operation of the gateway is restricted for use in a commercial, industrial or business environment.

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Chapter 1: Features

Introduction

The USRobotics Courier Modemulator allows a legacy M2M system to be conveniently converted to cellular without upgrading or replacing application software. The Modemulator accepts and responds to analog modem commands and sends result codes that mimic a PSTN connection, which allows drop-in compatibility with legacy application software.

Overview of Main Features

The following features and capabilities assure an easy transition from dial-up to cellular M2M.

Cellular Gateway Engine

The Modemulator is embedded into a full-featured cellular gateway, and connects to cellular networks using the gateway resources.

Operating Modes

The Modemulator operates in two distinct modes, which are selected by a MODE switch on the front of the device.

 Modemulator mode  Gateway mode

Modemulator Mode

In Modemulator mode, the Modemulator’s command line user interface emulates the behavior of a serial dial-up modem connecting over the PSTN.

 Modem AT command set  Originate or answer calls  PSTN response codes  Translate up to 7200 phone numbers into IP addresses

Cellular Gateway Mode

When in cellular gateway mode, the Modemulator configures the base unit to operate as a full-featured cellular gateway. Some of the key gateway features are:

 Interoperability with most cellular networks  GPS receiver  One 10/100 Mbps RJ45 Ethernet port  One DB9 RS-232 DCE serial port  IPsec VPN  Firewall  Graphical User Interface

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Automatic Switchover to Dial-up

To facilitate the gradual conversion of legacy systems to cellular or a permanently mixed system, the Modemulator can initiate and answer connections over the PSTN to sites with a dial-up modem by automatically diverting commands to a dial-up modem attached to its Modem serial port. This provides the User a single interface and protocol for connecting with both cellular and dial-up sites.

Dial Security

The Modemulator provides three forms of dial security for your connections, similar to those of a dial-up modem.

Programmable Login & Security Banners

The Modemulator can display a programmable login banner if Password Prompting is enabled, and display a programmable warning banner to alert unauthorized Users, similar to those of a dial-up modem.

HELP Screens

The Modemulator displays screens that summarize the AT command set, Dial command options, and Sregister functions, similar to those of a dial-up modem.

Remote Access

The Modemulator settings can be configured remotely as well as locally, similarly to a dial-up modem.

Firmware Upgrades

The Modemulator firmware is upgradable locally or remotely, allowing easy access to the latest Modemulator features and functions.

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2 4 5 6 7 8 2

Physical Features

Modemulator User Guide

1. WWAN Diversity Antenna Connector - SMA-female antenna port for connection to a diversity antenna or a GPS antenna. See the USR3520/USR803520 Gateway User Guide for details.

2. Gateway LEDs – The seven Gateway LEDs indicate the operating status of the Gateway base unit. See the USR3520/USR803520 Gateway User Guide for details.

3. Ethernet Port – 10/100 Mbps RJ-45. See the USR3520/USR803520 Gateway User Guide for details.

4. WWAN Main Antenna Connector - SMA-female antenna port for connection to a cellular antenna. See the USR3520/USR803520 Gateway User Guide for details.

5. Terminal Serial Port - The terminal serial port provides an RS-232 asynchronous serial DCE connection via a DB9-F connector. See Appendix J for pinout details. Use an appropriate serial cable to connect this port to the DTE serial port of a terminal that will send modem AT commands to the Modemulator. In gateway mode, this port is configured and activated by the Plugin tab of the gateway’s graphical user interface.

6. Mode Switch – This switch selects the operating mode. See Table 1 below for details.

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CONNECT

LED

MODE

LED

Switch

Position

Modemulator

mode

Connected

Green

←

Connection pending

(Originate or Answer)

Blinking

Green

←

Ready

Off

Green

←

Busy

Red

Green ← Gateway mode

Off

Red

→

Power OFF

Off

N/A

Table 1

7. Modemulator LEDs - These LEDs indicate the Modemulator operating mode and connection status. See Table 1 for details.

8. Modem Serial Port - The modem serial port provides an RS-232 asynchronous serial DTE connection via a DB9-M connector. See Appendix J for pinout details. Use an appropriate serial cable to connect this port to the DCE serial port of a dial-up modem to enable the Modemulator to manage PSTN connections to or from remote dial-up modems. In gateway mode, this port is inactive.

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9. External Power Supply Input – This input receives operating power from the external low voltage power supply that is included with the base unit. Connect the included power supply to this connector. See the USR3520/USR803520 Gateway User Guide for details.

10. Reset Button - Press and hold for less than five seconds to reset the unit to the last working settings. Press and hold for five seconds or more to reset the unit to factory settings. See the USR3520/USR803520

Gateway User Guide for details.

Mounting Instructions

The gateway can be mounted on a wall or DIN rail. See the USR3520/USR803520 Gateway User Guide for details.

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Chapter 2: Getting Started

This chapter describes:

 Verifying Modemulator Operation  Testing Modemulator Connectivity

For detailed configuration and advanced operating features see the Modemulator Command Reference section in this guide, and see the USR3520/USR803520 Gateway User Guide.

Verifying Modemulator Operation

Because Modemulators make a peer-to-peer connection to another Modemulator, it is required to perform this set-up procedure on two Modemulators.

For the USR3520/USR803520, please proceed directly to step 1.

For the USR3516-EMU upgrade kit, first follow the instructions in the USR3516-EMU Installation Guide to upgrade a USR3510/USR803510 Gateway to a USR3520/USR803520.

1. Check system requirements:

 Computer with an DB9 RS-232 serial port  Terminal emulation application that communicates with a COM port

If the computer does not have a serial port, use a USB-to-serial cable that is compatible with the computer’s operating system.

2. Connect a computer to the Modemulator.

Use a DB9-to-DB9 serial cable to connect the computer’s serial port to the Modemulator Terminal port.

Serial cables are widely available from electronics distributors and retailers.

3. Connect the included power supply unit (PSU) to the base unit.

Use the included PSU to power the base unit. Connect the PSU output jack to the power supply input, and then plug the PSU into a mains power outlet.

The Modemulator will take about two minutes to become operational.

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MODE

4. Put the Modemulator into Modemulator mode by moving the MODE switch to the left if not already

there.

The MODE LED will be green when the Modemulator is switched into Modemulator mode.

5. Open a Terminal Emulation Application.

Open a terminal emulation window on the computer and select the COM port corresponding to the computer’s serial port (usually COM1). Set the port parameters for 9600bps, 8 data bits, no parity, 1 stop bit.

Refer to the terminal emulation application documentation for details on setting parameters. It is recommended to set the application’s font for Courier, Courier New, or another fixed character width font to properly display the Modemulator screens.

6. Confirm communication with the Modemulator.

In the terminal emulation window, type AT<Enter>. The Modemulator should respond OK.

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ATI7 USRobotics Courier EMU Configuration Profile...

Product type Modemulator Product ID USR3516-EMU Code Date 09/08/15 Code Rev 1.0.02 Modemulator S/N 1MENB2AP0001 Cellular S/N MB19D7K4WK IMEI/MEID 356144040545432 IMSI 310410657302303 F/W Version m2m-1.46.0.2 S/W Version "USRobotics_V1.0.38" Date/Time 2015-09-09/10:26:03 Internet State connected WWAN Reg State registered Operator AT&T Carrier IP Addr 10.16.212.55 Signal Strength -73 ECIO -11 APN a105.2way.net

Type ATI7<Enter>. The Modemulator should display the I7 information screen, as shown in Figure 1. Actual parameter values may vary from Figure 1.

Figure 1

The Modemulator is now operational and ready to connect to the cellular network.

If the Modemulator does not respond to AT commands, remove power from the base unit and check the

Troubleshooting section.

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Testing Modemulator Connectivity

Because Modemulators make a peer-to-peer connection to another Modemulator, it is required to perform this set-up procedure on two Modemulators.

System requirements

 A computer with

o two DB9 RS-232 serial ports o An Ethernet port

 Terminal emulation application that communicates with COM ports  Web browser application

 Two computers, each with

o one DB9 RS-232 serial port o An Ethernet port

 Terminal emulation application that communicates with COM ports  Web browser application

If the computer does not have a serial port, use a USB-to-serial cable that is compatible with the computer’s operating system.

Set Up Cellular Connectivity

1. Attach both of the included antennas to the antenna connectors on the front of the Modemulator.

2. Make sure that a cellular service plan is associated with the device (for CDMA networks) or with a

SIM card (for GSM networks).

Modemulator functionality requires a cellular service plan that has device-to-device IP routing. This type is service is generally not available directly from Mobile Network Operators, so contact a Mobile Virtual Network Operator (MVNO) to obtain a suitable service plan. See Appendix K for details. Contact a USRobotics Sales representative for advice on finding a suitable service plan.

Preparing for GSM Networks

1. Remove power from the Modemulator.

2. Install the SIM (for GSM networks): a. Remove the four Torx T6 screws from the top cover plate on the back of the unit and

remove the plate.

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The MVNO will provide a document listing the peer-to-peer static IP address assigned to this SIM. Make note of this IP address for later use.

b. Insert the SIM into the SIM slot as shown in Figure 2.

Figure 2

c. Replace the top cover plate and its four TorxT6 screws.

Preparing for CDMA Networks

Devices connecting to a CDMA network do not require a SIM. After the MVNO has provisioned the data service, the Modemulator will automatically activate itself onto the CDMA network.

The MVNO will provide a document listing the peer-to-peer static IP address assigned to this device. Make note of this IP address for later use.

Connecting to the Cellular Network

1. Power up the Modemulator by plugging the provided power supply into the connector on the back

of the device.

The Modemulator will take about two minutes to become operational.

The Modemulator card uses the gateway resources for cellular connectivity. So the gateway must be setup for cellular connectivity before using Modemulator functionality.

2. Use an Ethernet cable to connect the gateway’s Ethernet port to and a computer Ethernet port.

3. Open a web browser on the computer and enter the address 192.168.1.1 into the address bar.

Enter the default username (admin) and password (admin). After a successful login, the Home screen will appear.

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LAN to WAN routing is enabled by default. Once connected, any

WARNING!

Internet activity on your system will consume Cellular Data.

For configuration and more information go to Appendix B

4. Click on the “Interfaces” tab on the top menu bar and select 3G connection.

5. In the “General” section, select the radio firmware for the wireless service provider that you are

using. Click “Save changes”.

6. Verify/Update the gateway APN to match the network APN provided by the MVNO.

For GSM wireless service:

 The network settings will populate automatically for many SIM cards. Check the settings of

the APN, Username, Password, and International Roaming. Update if necessary.

 Click “Save changes”.

For CDMA service:

 For both Verizon Wireless and Sprint services the activation will occur automatically.  Click on the “Home” tab on the top menu bar.  Connection to the network will be setup automatically.

7. Disconnect the Ethernet cable.

Configure Modemulator Dialing Directory

The Modemulator makes a peer-to-peer connection to another Modemulator, which emulates a dial-up modem connecting to another dial-up modem. In both cases, the calling device has to know the “number” of the answering device.

For an M2M system based on dial-up modems and PSTN networks, the telephone service provider assigns a phone number to the destination, and the User (or software application) commands the calling modem to dial the phone number of the destination modem.

For an M2M system based on Modemulators and cellular networks, the MVNO that provides the cellular data service will assign a static IP address to each device (CDMA) or SIM (GSM) on the account. That IP address is the “number” that the calling device must know.

In order for the Modemulator to be a drop-in replacement for dial-up modems, it has to accept a command to dial a PSTN phone number, but translate that number into the IP address of the destination Modemulator. That translation is done by the Modemulator dialing directory.

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phone

number

port

number

address

For this example, one Modemulator will be referred to as the “local” Modemulator, and the other will be referred to as the “remote” Modemulator.

In this example, the local Modemulator’s dialing directory will be programmed to recognize the example phone number 555-1234 and translate it into the IP address of the remote Modemulator.

Conversely, the remote Modemulator’s dialing directory will be programmed to recognize the example phone number 555-5678 and translate it into the IP address of the local Modemulator.

Set-Up the Local Modemulator Dialing Directory

1. Power up the local Modemulator by plugging the provided power supply into the connector on the

back of the device, and then plug the PSU into a mains power outlet.

The Modemulator will take about two minutes to become operational.

2. Connect the local Modemulator Terminal port to a computer serial port. In the terminal application,

set this COM port for 9600bps, 8N1.

3. Consult the MVNO documentation for the static IP address assigned to the remote Modemulator

for CDMA networks or assigned to the SIM installed in remote Modemulator for GSM networks.

4. Enter the example phone number, port number (Modemulator listens to port 8888 by default), and

IP address (assigned by the MVNO) of the remote Modemulator into the local Modemulator’s dialing directory by typing the following command into the local Modemulator, substituting the

static IP address assigned by the MVNO for the remote Modemulator:

AT{Y=5551234:8888:xxx.xxx.xxx.xxx <Enter>

Modemulator should respond OK.

5. Type the following command to set the local Modemulator to auto-answer on one ring:

ATS0=1 <Enter>

Modemulator should respond OK.

6. Keep the local Modemulator powered-up and connected to the computer serial port.

Set-Up the Remote Modemulator Dialing Directory

1. Power up the remote Modemulator by plugging the provided power supply into the connector on

the back of the device, and then plug the PSU into a mains power outlet.

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phone

number

port

number

address

The Modemulator will take about two minutes to become operational.

2. Connect the remote Modemulator Terminal port to another computer serial port. In the terminal

application, set this COM port for 9600bps, 8N1.

3. Consult the MVNO documentation for the static IP address assigned to the local Modemulator for

CDMA networks or assigned to the SIM installed in local Modemulator for GSM networks.

4. Enter the example phone number, port number (Modemulator listens to port 8888 by default), and

IP address (assigned by the MVNO) of the local Modemulator into the remote Modemulator’s dialing directory by typing the following command into the remote Modemulator, substituting the

static IP address assigned by the MVNO for the local Modemulator:

AT{Y=5555678:8888:xxx.xxx.xxx.xxx <Enter>

Modemulator should respond OK.

5. Type the following command to set the remote Modemulator to auto-answer on one ring:

ATS0=1 <Enter>

Modemulator should respond OK.

6. Keep the remote Modemulator powered-up and connected to the computer serial port.

Making a Connection

With connectivity and dialing directories now set-up, follow the steps below to make a Modemulator test connection.

1. Type the following command to the local Modemulator to initiate a connection to the remote

Modemulator:

ATD5551234 <Enter>

The local Modemulator will take a few moments to make a connection to the remote Modemulator.

 The local Modemulator should first report RINGING, then CONNECT 9600.  The remote Modemulator should first report RING, then CONNECT 9600.

2. Test the data transfer:

 Type characters into the local terminal. A few moments later the characters should appear on

the remote terminal.

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 Type characters into the remote terminal. A few moments later the characters should appear

on the local terminal.

3. Drop the connection by using one of these two methods:

 Type the escape sequence +++ into the local terminal to drop the connection. The local

Modemulator should then respond NO CARRIER.

 Using the local terminal capabilities, de-assert the RS-232 DTR signal to drop the connection.

The local Modemulator should respond NO CARRIER. Then re-assert DTR to allow further communication.

The Modemulators are now operational and ready to install.

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Chapter 3: Applications

This chapter summarizes how to:

 Convert a legacy dial-up M2M system to cellular  Maintain compatibility with dial-up modems

For detailed configuration and advanced operating features see the Modemulator Command Reference section in this guide, and see the USR3520/USR803520 Gateway User Guide.

Convert A Legacy Dial-up M2M System To Cellular

Properly configured Modemulators are drop-in cellular replacements for dial-up PSTN modems, which extends the useful life of legacy M2M software and hardware, while providing the benefits of a transition from the PSTN to the cellular network.

Modemulators normally operate in a peer-to-peer fashion, with a Modemulator on both ends of a connection. Alternatively, the Modemulator can operate in single-ended mode for a system that has remote Modemulators connecting directly with a TCP/IP server. Both types of systems are described below.

Peer-to-Peer Operation

First, follow the Getting Started chapter in this guide to verify that two Modemulators are operating properly.

System Architecture

A legacy M2M host site (Headquarters, Operations Center, etc.) is the source of data being transferred to all of the remote sites, or is the destination of data being transferred from all of the remote sites. This host site has application hardware and software that normally interfaces with a serial dial-up modem used to transfer the data.

The legacy M2M remote sites are the sources of data being transferred to a host site, or are the destinations of data being transferred from a host site. Each remote site has application hardware and software that normally interfaces with a serial dial-up modem used to transfer the data.

The Terminal port of the Modemulator at the host site connects to a serial port of the host application hardware that would normally connect to a serial dial-up modem, and the Terminal port of the Modemulator at each remote site connects to a serial port of the remote application hardware that would normally connect to a serial dial-up modem.

An RF survey of the host and remote sites may be necessary to determine if the installations are in range of cellular reception from the operator chosen to provide service. Consult a professional cellular installer for assistance.

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Set-Up the Host Modemulator

The Modemulator defaults to peer-to-peer mode, which allows the host Modemulator to initiate a connection to any remote Modemulator or any remote Modemulator to initiate a connection to the host Modemulator.

The Modemulator that interfaces to the host application software must be configured as required by the software with the same settings as a dial-up modem. The application software may automatically send initialization commands to the modem, or may require the modem to be pre-configured. Consult the application software User Guide for any requirements for pre-configuring the attached modem.

If the application software User Guide is not available, modem configuration settings can normally be read directly from the dial-up modem. See the modem User Guide for details. Those settings can then be referenced when pre-configuring the Modemulator.

Choose an arbitrary phone number for each remote Modemulator. For drop-in compatibility with the host software, use the phone numbers that the host software is already programmed to dial. Program the host Modemulator’s dialing directory with the static IP address of each remote Modemulator and the corresponding phone number.

Disconnect the dial-up modem from the application hardware serial port, and connect the Modemulator to the application hardware serial port. The application hardware will now use the Modemulator for all communications.

Set-Up Each Remote Modemulator

The Modemulator that interfaces to the remote application software must be configured as required by the software with the same settings as a dial-up modem. The application software may automatically send initialization commands to the modem, or may require the modem to be pre-configured. Consult the application software User Guide for any requirements for configuring the attached modem.

If the application software User Guide is not available, modem configuration settings can be read directly from the dial-up modem. See the modem User Guide for details. Those settings can then be referenced when pre-configuring the Modemulator.

Choose an arbitrary phone number for the host Modemulator. For drop-in compatibility with the remote software, use the phone number that the remote software is already programmed to dial. Program each

remote Modemulator’s dialing directory with the static IP address of the host Modemulator and the

corresponding phone number.

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Outgoing Calls

In a peer-to-peer system the host Modemulator or any remote Modemulator may initiate a connection.

To initiate a connection from an originating Modemulator to an answering Modemulator, a dial command is sent by the legacy software to the originating Modemulator. The originating Modemulator will search its dialing directory for an entry containing the phone number from that dial command.

 If an entry for that phone number is found in the dialing directory, the originating Modemulator

will open an IP connection to the IP address of the answering Modemulator. The originating Modemulator and the answering Modemulator will then send call-progress messages to the legacy application software that mimic those of a dial-up modem. If the answering Modemulator is configured to auto-answer or if the application software issues an answer command, the connection will complete, which emulates the behavior of dial-up modems.

 If the answering Modemulator does not auto-answer or manually answer, the connection will

time-out, which emulates the behavior of dial-up modems.

 The originating Modemulator will report NO DIALTONE or BUSY or NO CARRIER if the answering

Modemulator already has a connection in-progress with another Modemulator.

 The originating Modemulator will report NOT FOUND if an entry for that phone number is not

found in the dialing directory, and a dial-up modem is not attached or not available. See Maintain

Compatibility With Dial-up Modems for information about attaching a dial-up modem to a

Modemulator.

 If an entry for that phone number is not found in the dialing directory, and a dial-up modem is

attached and available, the originating Modemulator will forward the dial command to the attached dial-up modem which will dial the number via the PSTN. See Maintain Compatibility With

Dial-up Modems for information about attaching a dial-up modem to a Modemulator.

The legacy software sends the same type of command to initiate both cellular and analog connections, and receives the same type of responses. This makes the type of connection indistinguishable and transparent to the legacy software.

Incoming Calls

In a peer-to-peer system the host Modemulator or any remote Modemulator may answer a connection. Incoming cellular calls will route through the answering Modemulator’s Terminal port to the legacy application software when a connection completes.

 If the answering Modemulator does not have a cellular connection already in-progress with

another Modemulator, the answering Modemulator will accept the IP connection from the originating Modemulator. The originating Modemulator and the answering Modemulator will

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then send call-progress messages to the legacy application software that mimic those of a dial-up modem. If the answering Modemulator is configured to auto-answer or if the application software issues an answer command, the connection will complete, which emulates the behavior of dial-up modems.

 If the answering Modemulator does not auto-answer or manually answer, the connection will

time-out, which emulates the behavior of dial-up modems.

 If the answering Modemulator has a cellular connection already in-progress with another

Modemulator, the current connection will not be interrupted and the originating Modemulator will report NO DIALTONE or BUSY or NO CARRIER.

The following diagram illustrates a simplified peer-to-peer legacy system using two Modemulators and peer-to-peer cellular service.

Single-Ended Operation

First, follow the Getting Started chapter in this guide to verify that one Modemulator is operating properly.

System Architecture

A legacy M2M host site (Headquarters, Operations Center, Transaction Processor) is the destination of data being transferred from all of the remote sites. This host site has application hardware and software that interfaces with the Internet to accept an IP connection and transfer the data.

The legacy M2M remote sites are the sources of data being transferred to the host site. Each remote site has application hardware and software that normally interfaces with a serial dial-up modem used to transfer the data.

Modemulators can replace the dial-up modems at all or some of the remote sites. The Terminal port of the Modemulator at each remote site connects to a serial port of the remote application hardware that would normally connect to a serial dial-up modem.

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An RF survey of the remote sites may be necessary to determine if the installations are in range of cellular reception from the operator chosen to provide service. Consult a professional cellular installer for assistance.

Set-Up Each Remote Modemulator

The Modemulator defaults to peer-to-peer mode, but for a single-ended system it must be configured for single-ended operation. Single-ended operation is enabled by issuing the {M1 command. See the

Command Reference chapter of this document for details.

Choose an arbitrary phone number for the host server. For drop-in compatibility with the remote software, use the phone number that the remote software is already programmed to dial. Program each

remote Modemulator’s dialing directory with the IP address of the host server and the corresponding

phone number.

Modemulator Outgoing Calls

In a single-ended system the host is a TCP/IP server, and any remote Modemulator may initiate a connection.

To initiate a connection from a remote Modemulator to the host, a dial command is sent by the legacy software to the remote Modemulator. The remote Modemulator will search its dialing directory for an entry containing the phone number from that dial command.

 If an entry for that phone number is found in the dialing directory, the remote Modemulator will

open an IP connection to the IP address of the host. The remote Modemulator will then send callprogress messages to the legacy application software that mimic those of a dial-up modem. If the host accepts the IP session, the connection will complete, which emulates the behavior of dial-up modems.

 If the host does not accept the IP session, the connection will time-out, which emulates the

behavior of dial-up modems.

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 The remote Modemulator will report NOT FOUND if an entry for that phone number is not found in

the dialing directory, and a dial-up modem is not attached or not available. See Maintain

Compatibility With Dial-up Modems for information about attaching a dial-up modem to a

Modemulator.

 If an entry for that phone number is not found in the dialing directory, and a dial-up modem is

attached and available, the remote Modemulator will forward the dial command to the attached dial-up modem which will dial the number via the PSTN. See Maintain Compatibility With Dial-up

Modems for information about attaching a dial-up modem to a Modemulator.

The legacy software sends the same type of command to initiate the cellular connection as it does for an analog connection, and receives the same type of responses. This makes the cellular connection indistinguishable from an analog connection to the legacy software.

Modemulator Incoming Calls

In a single-ended system that uses conventional cellular service, the host will be unable to initiate a connection to the remote Modemulators because of constraints in the cellular network, unless a VPN tunnel or public static IP address is used.

 The cellular service provider normally assigns dynamic IP addresses to the cellular devices, which

prevents the host from knowing the current IP address of the remote Modemulators.

 The cellular service provider may have a firewall preventing any host from contacting the IP

address of any cellular devices.

The following diagram illustrates a simplified single-ended legacy system using one Modemulator and conventional client/server cellular service.

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Maintain Compatibility with Dial-up Modems

The host Modemulator of a peer-to-peer system can utilize an attached serial dial-up modem for connections with remote dial-up modems via the PSTN. This section describes a system that has a mixture of remote Modemulators and remote dial-up modems.

A mixed cellular / dial-up system requires:

 Cellular peer-to-peer service for the host Modemulator and remote Modemulators  PSTN service at the host site and at all remote dial-up sites  A serial dial-up modem attached to the host Modemulator at the host site  A dial-up modem attached to the remote application hardware at each remote dial-up site

Follow the set-up for peer-to-peer operation to program the host Modemulators dialing directory with IP addresses for the remote Modemulators.

Do not enter the PSTN phone number of any remote dial-up site into the host Modemulators dialing directory.

The host Modemulator can initiate or answer PSTN connections by using an attached serial dial-up modem. Also, any configuration commands sent to the Modemulator are processed by both the Modemulator and by the attached modem. In that way, modem initialization strings sent by legacy software will apply to both the Modemulator and the dial-up modem.

Outgoing PSTN Calls

For a PSTN connection to be initiated, a dial command is sent to the host Modemulator by the legacy software. The host Modemulator will search its dialing directory for an entry containing the phone number in the dial command.

 If no entry is found for that phone number, the dial command will be forwarded to the attached

dial-up modem which will dial that phone number via the PSTN, allowing the legacy software to contact any remote dial-up site.

 The host Modemulator will report NOT FOUND if a PSTN phone number is dialed and a dial-up

modem is not attached or not available based on the RS232 CTS signal.

The legacy software sends the same type of dial command to initiate either cellular or PSTN connections, and receives the same type of responses. This makes the type of connection indistinguishable and transparent to the legacy software.

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Incoming Calls

Incoming PSTN calls or incoming cellular calls will route through the host Modemulator’s Terminal port to the legacy application software when a connection completes.

 If the host Modemulator has a cellular connection already in-progress with a remote

Modemulator, the host Modemulator will de-assert the RS-232 DTR signal to the attached dial-up modem to prevent the attached dial-up modem from answering an incoming PSTN call.

 If the host Modemulator has a PSTN connection already in-progress with a remote dial-up modem

and a remote Modemulator attempts to contact the host Modemulator, the remote Modemulator will report NO DIALTONE.

 If the host Modemulator has a cellular connection already in-progress with a remote

Modemulator, and another remote Modemulator attempts to contact the host Modemulator, the remote Modemulator will report NO DIALTONE or BUSY or NO CARRIER.

The following diagram illustrates a simplified peer-to-peer legacy system using two Modemulators, cellular peer-to-peer service, two dial-up modems, and PSTN service.

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Chapter 4: Command Reference

This section includes information about:

 Using the AT Command Set  Modemulator Memory  AT Command Reference Guide

Using the AT Command Set

Overview

If Modemulator mode is enabled by the Mode switch on the front panel, and if no connection is inprogress, AT commands can be sent to the Modemulator Terminal port to change Modemulator settings.

To send AT commands to the Modemulator, run a terminal emulation application on a computer, configured so the selected COM port sends whatever is typed to the computer RS-232 serial port that is attached to the Modemulator. By default, the Modemulator will echo commands back to the terminal.

General rules for using AT commands

Here are some general guidelines for sending AT commands to the Modemulator:

Type AT before each command and press ENTER after each command.

The exceptions are A/ and +++, which require neither AT nor ENTER.

Leave zeroes off the end of AT commands. A missing numeric parameter is assumed to be a zero. For example, ATE is equivalent to ATE0.

Either use AT (all caps) or at (all lower case). Mixed case, as in At for example, is unacceptable.

Create compound commands of up to 58 characters between AT and ENTER.

Example: AT&H1 D(847)555-1234

AT Attention; a command follows. &H1 Enable hardware flow control. D Dial the following number.

Optional hyphens, spaces, and parentheses add to the count of 58 characters.

Commands not recognized will be accepted and ignored.

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Modemulator Memory

This section describes the types of memory that are included in the Courier Modemulator & M2M Gateway, what the memory is used for, and where the memory is located.

The Modemulator Base Unit

The Courier Modemulator & M2M Gateway base unit contains Random Access Memory (RAM) and Flash memory. These memories hold the operating system, radio firmware, system firmware, and application software that control the operation of the base unit. The system firmware and the application software are user-upgradable. See the USR3520/USR803520 Gateway User Guide or the USR3516-EMU Installation

Guide for details on loading new system firmware and application software into the base unit.

The Modemulator Expansion Card

The USR3516-EMU expansion card that is installed into the Courier Modemulator & M2M Gateway contains three types of memory that users can interact with: Random Access Memory (RAM), NonVolatile Random Access Memory (NVRAM), and Flash memory.

Random Access Memory

The RAM holds the current settings that control the Modemulator card operation. These settings are recalled from NVRAM and loaded into the RAM on power-up or when the Modemulator receives an ATZ command. Commands sent to the Modemulator to change settings will modify the RAM parameters only. The settings must be saved into NVRAM to make the new settings nonvolatile. The commands to display and manage the Modemulator card settings are detailed in the AT Command Reference Guide section in this guide.

Nonvolatile Random Access Memory

The Modemulator card uses Electrically Erasable Programmable Read Only Memory (EEPROM) for nonvolatile storage. This NVRAM is used to hold Modemulator card settings that are recalled to RAM on power-up or when the Modemulator receives an ATZ command, and also holds the Modemulator card dialing directory, security accounts, and security banners. The commands to display and manage the Modemulator card NVRAM are detailed in the AT Command Reference Guide section in this guide.

Flash Memory

The Modemulator card firmware is stored in the Modemulator card Flash memory, which is another type of nonvolatile storage. This firmware includes factory defaults that can be recalled by sending AT&F0, AT&F1, or AT&F2 commands. See the AT Command Reference Guide section in this guide for details. The firmware stored in the Modemulator card Flash memory is user-upgradable. See Appendix I in this guide for details on loading new Modemulator card firmware into Flash memory.

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AT$ Basic Command Help (unrecognized commands accepted & ignored)

D$ Dial Command Help I1 Main Checksum &$ Ampersand Command Help I4 RAM Variables {$ Modemulator Command Help I5 EEPROM Variables S$ S-Register Command Help I6 Link Diagnostics I7 Product Profile !! Flash New Code O Return Online A/ Repeat Last Command Q0 Display Result Codes A Manual Answer Q1 Quiet Mode

E0 Command Echo Off V0 Numeric Result Codes E1 Command Echo On V1 Verbal Result Codes

F0 Local Online Echo On X0-7 Result Code Options F1 Local Online Echo Off Z Recall EEPROM Variables H Hang Up

AT Command Reference Guide

'*' denotes command available in Remote Command Mode. (See the {R1 command)

Basic Commands

AT$ * Display Basic Command Help Screen:

This command will not be forwarded to the analog modem.

A/ Repeat Last Command

This command will repeat the last AT command string attempted. If the last AT command ended in DL, and the last number dialed was a Direct dial IP address, then "ERROR" will be displayed.

This command will not be forwarded to the analog modem.

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ATD$ Dial Command Help (unrecognized commands accepted & ignored)

D:IP:Port Direct IP Dialing

D:IP Direct IP Dialing if Port=8888

DL Dial Last Number

Dn Dial Phone Number n

, Dial Modifier for Pause (S8 seconds)

A Manual Answer

This must be the last command in the AT command string.

This command would be used to answer an incoming call when autoanswer is disabled. The command would be issued by the User, or by an application when the RING message is received, or when the Ring Indicate (RI) signal goes active on the RS-232 interface.

D$ Dial Command Help Screen:

Modemulator User Guide

This command will not be forwarded to the analog modem.

Dn Dial (n=phone number)

This must be the last command in the AT command string.

If a Dial command is issued before DSR is asserted, the ERROR message will be displayed. DSR is asserted after the Listener port (TCP server) has started and the Connect LED has started flashing green.

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Dial modifier characters (except comma, colon, and L) in dial commands that initiate cellular connections are ignored. Dial modifier characters in dial commands that are forwarded to an attached dial-up modem are processed by the modem.

Use this command as you would for an ordinary analog modem. There are two cases:

1. The dialing directory is searched for an entry containing the phone number n and a match is

found. (see the {Y command). In this case, the legacy analog phone number (or any number of your choosing) is translated into the Port number and IP address in the directory entry, and used to create a TCP client connection to the remote TCP server (Listener).

Example: ATD3456789

(The remote analog modem with this phone number was replaced by a Modemulator, and {Y was used to translate the number to a Port/IPaddress)

Example: ATDT4

(The {Y command was used to create an entry having the phone number 4, with the associated Port/IPaddress of the new remote Modemulator)

This is equivalent to ATD4 since the 'T' dial modifier is ignored.

2. The dialing directory is searched for an entry containing the phone number n and a match is

not found. In this case, the entire AT command string is forwarded to the connected analog modem (if present), and an ordinary analog modem connection is attempted. If no analog modem is attached, the NOT FOUND message is displayed.

To forward only the dial string portion, but not the configuration commands, issue the {F1

command.

Example: ATDT18005551234

(a remote analog modem's phone number)

The following commands are not forwarded to the analog modem:

$ (Help) commands

I (Info) commands

{ (Modemulator-only) commands

&C0 (force DCD) command

A/ (repeat last command)

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If a command string is to be forwarded to the analog modem, any of the above commands should be grouped at the end of the configuration commands, and before the Dial command, if present.

DL Dial Last Number

This must be the last command in the AT command string.

Redial the last phone number attempted. It proceeds as in the cases described in the Dn or D: commands.

DSn Dial Stored Number

Since the 'S' in ATDSn is ignored as a non-implemented dial modifier, Dial Stored Number commands can be emulated. The USRobotics Courier analog modem allows stored numbers in locations 0 through 79, so to emulate a stored phone number with the Modemulator, simply assign a phone number in the Modemulator dialing directory equal to the legacy storage location index.

Example: AT{Y=2::172.17.2.1

(Stores the phone number 2, the default port number, and the IP address into the Modemulator dialing directory)

Modemulator User Guide

ATDS2

(Dials the stored number 2, where 2 was formerly the location of the stored number in the analog modem)

D:i:p Direct IP Dialing (i=destination IP address, p=destination port number)

This must be the last command in the AT command string.

Bypass the directory lookup, and attempt to create the TCP client connection directly, using the IP address and port number supplied in the command.

Separate the ATD, IP address, and Port number with ':' (colon) characters.

Example: ATD:172.17.2.1:2025

If using the default Listener port number (8888) on the answering Modemulator, you may optionally omit the port number.

Example: ATD:172.17.2.1

One advantage of using direct IP dialing is that it doesn't use the dialing directory, so the number of remotes is unlimited. The dialing directory is limited to 7200 entries.

E0 * Command Echo OFF

Disable local echo of typed characters.

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ATI1 CE58

E1 * Command Echo ON (default)

Enable local echo of typed characters.

F0 * Local Online Echo ON

Enable local echo of typed characters in a data connection.

This is sometimes known as half-duplex mode.

F1 * Local Online Echo OFF (default)

Disable local echo of typed characters in a data connection.

This is sometimes known as full-duplex mode.

H * Hang Up

This must be the last command in the AT command string.

Disconnect the local TCP client from Remote Command Mode (see the {R1 command) and cause both Modemulators to report NO CARRIER.

I1 * Display Checksum

Display the Modemulator firmware's 4 digit hex checksum (used mainly by tech support).

Example:

This command will not be forwarded to the analog modem.

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ATI4 USRobotics Courier EMU Settings...

BAUD=115200 PARITY=N WORDLEN=8

E1 F1 Q0 V1 X7

&C1 &D2 &H1 &I0 &L0 &R2 &S0

{C0 {D0 {F0 {J0 {M0 {O0 {R0

S00=001 S01=000 S02=043 S07=060 S08=002 S19=000 S21=010 S22=017 S23=019 S44=015 S59=000 S60=020 S61=120 S64=060 S65=015

LAST DIALED #: 2

I4 * Display RAM Variables

Display the current settings of RAM variables. This screen is formatted to be similar to a USRobotics Courier Dial-up Business Modem.

Example:

Modemulator User Guide

This command will not be forwarded to the analog modem.

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ATI5 USRobotics Courier EMU NVRAM Settings...

BAUD=115200 PARITY=N WORDLEN=8

E1 F1 Q0 V1 X7

&C1 &D2 &H1 &I0 &L0 &R2 &S0

{C0 {D0 {F0 {J0 {M0 {O0 {R0

S00=001 S02=043 S07=060 S08=002 S19=000 S21=010 S22=017 S23=019 S44=015 S59=000 S60=020 S61=120 S64=060 S65=015

I5 * Display NVRAM Variables

Display the current settings of variables stored in EEPROM. This screen is formatted to be similar to a USRobotics Courier Dial-up Business Modem.

Example:

Modemulator User Guide

This command will not be forwarded to the analog modem.

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ATI6 USRobotics Courier EMU Link Diagnostics...

Chars Sent 0 Chars Rcvd 0

Max Latency (sec) 000

Last Call 000:00:00:04

Disconnect Reason is DTR dropped

I6 * Display Link Diagnostics

Display the link diagnostic information for the last connection (or current connection if in Remote Command Mode - see the {R1 command).

Example:

Modemulator User Guide

Chars Sent TXD characters sent to remote Modemulator.

Chars Rcvd RXD characters received from remote Modemulator.

Max Latency (See S61 for description)

(Blank in Single-Ended mode)

(Blank if remote heartbeat period is zero)

Last Call Duration of call in days:hrs:min:sec.

(Labeled "Current Call" if in Remote Command Mode)

Disconnect Reason (See Appendix E for a list)

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ATI7 USRobotics Courier EMU Configuration Profile...

This command will not be forwarded to the analog modem.

I7 Display Configuration Profile

Display information about the product.

Example:

Modemulator User Guide

This command will not be forwarded to the analog modem.

O * Return Online

This must be the last command in the AT command string.

Exit Remote Command Mode (see the {R1 command) and return to ordinary data connection.

The CONNECT message will report the DTE speed of the answer side.

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Result Code Options:

0/OK

1/CONNECT

2/RING

3/NO CARRIER

4/ERROR

6/NO DIAL TONE

7/BUSY

8/NO ANSWER

10/REFUSED

11/RINGING

Q0 * Display Result Codes (default)

Enable the display of result codes (verbal or numeric).

(See Appendix D for a description of result codes)

Q1 * Quiet Mode

Disable the display of result codes (verbal and numeric).

V0 * Numeric Result Codes

Replace verbal result codes with numeric codes.

(See Appendix D for a description of result codes)

V1 * Verbal Result Codes (default)

Use verbal result codes.

(See Appendix D for a description of result codes)

Modemulator User Guide

Xn * Result Code Options (default=X7)

The local DTE speed is appended to the CONNECT message.

(See Appendix D for a description of result codes)

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Z * Recall NVRAM Variables

This must be the last command in the AT command string.

Recall all stored variables from EEPROM and copy to RAM.

Settings for the following RAM variables are stored in EEPROM:

E F Q V X

&C &D &H &I &L &R &S

{C {D {F {J {M {O {R

S0 S2 S7 S8 S19 S21 S22 S23 S44 S59 S60 S61 S64 S65

(See &W command for storing variables in EEPROM)

!! * Flash New Modemulator Code

This must be the last command in the AT command string.

Modemulator User Guide

(See Appendix I Procedure for Flashing New Firmware into Modemulator)

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AT&$ Ampersand Command Help (unrecognized commands accepted & ignored)

&C0 CD Override &I0 S/W Recv Flow Ctrl Disabled &C1 CD Normal &I1 Xon/Xoff Signals Local & Remote &I2 Xon/Xoff Signals Local Only &D0 DTR Override &D2 DTR Normal &L0 Normal Line &L1 Leased Line &F0 Factory (no flow) &F1 Factory (H/W flow) &R1 Modem Ignores RTS &F2 Factory (S/W flow) &R2 RTS Controls RXD Out

&H0 Flow Ctrl Disabled &S0 DSR Override &H1 Flow Ctrl H/W &S1 DSR Follows CD &H2 Flow Ctrl S/W &W Save Settings to EEPROM

Ampersand Commands

&$ * Display Ampersand Command Help Screen:

This command will not be forwarded to the analog modem.

&C0 * CD Override

Assert the DCD signal on the RS-232 interface for DTE applications that require it.

This command will not be forwarded to the analog modem.

&C1 * CD Normal Operation (default)

The DCD signal on the RS-232 interface behaves normally. If the Modemulator is currently in a cellular or analog connection, the DCD signal will be asserted.

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&D0 * DTR Override

If the local DTE does not provide the DTR signal on the RS-232 interface, the Modemulator firmware can behave as if DTR is asserted with this command.

&D2 * DTR Normal Operation (default)

The DTR signal on the RS-232 interface behaves normally. If the Modemulator is currently in a cellular or analog connection, and the DTR signal is de-asserted, the connection will be terminated. Be sure to re-assert DTR before the next connection attempt.

&F0 * Set Factory Defaults - no flow ctrl

Equivalent to sending AT&F1 X1 &H0 &R1

(See Factory Defaults Table below)

&F1 * Set Factory Defaults - H/W flow ctrl (as shipped from factory)

(See Factory Defaults Table below)

&F2 * Set Factory Defaults - S/W flow ctrl

Equivalent to sending AT&F1 &H2 &I2 &R1

(See Factory Defaults Table below)

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Parameter

&F0

&F1

&F2

Parameter

&F0

&F1

&F2

1 1 1 S0

000

000 F 1 1 1 S2

043

043 Q 0 0 0 S7

060

060 V 1 1 1 S8

002

002 X 1 7 7 S19

000

1 1 1 S21

010

2 2 2 S22

017

0 1 2 S23

019

0 0 2 S44

015

0 0 0 S59

000

1 2 1 S60

020

0 0 0 S61

120

0 0 0 S64

060

0 0 0 S65

015

0 0 0

0 0 0 {O

0 0 0

Factory Defaults Table:

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&H0 * Flow Control Disabled

No Hardware or Software flow control will be used.

(See Appendix F Flow Control)

&H1 * H/W Flow Control (default)

Hardware flow control (CTS/RTS) will be used.

(See Appendix F Flow Control)

&H2 * S/W Flow Control

Software flow control (Xon/Xoff) will be used.

(See Appendix F Flow Control)

&I0 * S/W Receive Flow Control Disabled (default)

Xon and Xoff characters received from the local DTE are treated as ordinary data.

(See Appendix F Flow Control)

&I1 * Xon/Xoff Signals Local and Remote Modemulator

Xon and Xoff characters received from the local DTE control the flow of data to the DTE and Xon/Xoff characters are also passed along to the remote Modemulator as data.

(See Appendix F Flow Control)

&I2 * Xon/Xoff Signals Local Modemulator Only

Xon and Xoff characters received from the local DTE control the flow of data to the DTE, but are not passed along to the remote Modemulator as data.

(See Appendix F Flow Control)

&L0 * Normal Line (default)

Emulate normal PSTN dialup operation.

(See Appendix L Leased Line Operation)

&L1 * Leased Line

Emulate the operation of a private point-to-point leased circuit.

(See register S44 and Appendix L Leased Line Operation)

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&R1 * Modemulator Ignores RTS

If &H is set to 1 (H/W flow control), then &R1 causes the Modemulator to ignore the incoming RTS receive flow control signal.

(See Appendix F Flow Control)

&R2 * RTS Controls RXD out (default)

If &H is set to 1 (H/W flow control), then &R2 causes the Modemulator to obey the incoming RTS receive flow control signal to enable/disable the flow of received data to the local DTE.

(See Appendix F Flow Control)

&S0 * DSR Override (default)

Assert the DSR signal on the RS-232 interface for DTE applications that require it.

This does not mean that DSR will be always ON. It will be ON when the Modemulator is ready for commands and when DCD is ON. It will be OFF while the cellular Gateway is booting or after a disconnect while the TCP/IP Listener is starting.

&S1 * DSR follows DCD

The DSR signal follows the DCD signal on the RS-232 interface.

&W * Store RAM Variables to EEPROM

This must be the last command in the AT command string.

Settings for the following RAM variables will be stored in EEPROM:

E F Q V X

&C &D &H &I &L &R &S

{C {D {F {J {M {O {R

S0 S2 S7 S8 S19 S21 S22 S23 S44 S59 S60 S61 S64 S65

(See the Z command for recalling variables from EEPROM)

Also the current baud rate and parity format of the Terminal port will be saved to EEPROM which will then be applied to the Terminal port upon power-up.

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AT{$ Modemulator Command Help (unrecognized commands accepted & ignored)

{B Program Security Banner {A Switch to Analog Port until DTR off {B? Display Security Banner {I= Program CID {L Program Login Banner {Z= Program Listener Port Number {L? Display Login Banner Bitmapped: n=1 Shown Below {S Display Security Settings ------------------------- {Sn= Set User n Password {Cn S59.1 Enable CID {Pn= Set User n Admin Privileges {Fn S59.2 Disable Cmd Fwd to Analog Port {Mn S59.3 Single-Ended Modemulation {W Wipe Phone:Port:IP Recs {Rn S59.4 Sched Remote Cmd Mode Next Dial {X Display Phone:Port:IP Recs {On S59.5 Originate Only {Y= Program Phone:Port:IP Recs {Jn S59.6 Concatenate Banners {Dn S59.7 Enable Dialback Security

Modemulator Commands

Modemulator commands will not be forwarded to the analog modem.

{$ * Display Modemulator Command Help Screen:

{A Switch to Analog Modem Port until DTR Off

This must be the last command in the AT command string.

If an analog modem is attached to the analog modem port, you can communicate directly with it by using this command. When finished, toggle DTR off then back on to return to AT command mode in the Modemulator.

{B * Program Security Banner

This must be the last command in the AT command string.

When Password Prompting is enabled (see {Sn command), a Security Banner (up to 256 characters) can be displayed before the Login Banner and login prompt.

Factory default is no Security Banner.

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AT{B Program Security Banner (up to 256 chars)... (type \n for new line)

After issuing this command, the following prompt will appear:

Type up to 256 displayable characters. Each occurrence of '\n' will be replaced with a carriage return/line feed pair (CRLF). When finished, press Enter.

To clear the Security Banner, enter AT{B=<Enter>

{B? * Display Security Banner

Displays the programmed Security Banner.

{C0 * Disable Transmission of Caller ID String (default)

Prevents transmission of the Caller ID string during connection handshake.

{C1 * Enable Transmission of Caller ID String

If the calling Modemulator has {C1 set, and has programmed the Caller ID with the {I command, the Caller ID string will be sent to the answering Modemulator before acknowledging the first ringback.

If the answering Modemulator has {C1 set, then the Caller ID of the calling Modemulator must be found in the dialing directory (as the phone number) or else the connection is refused.

(See Appendix G Caller ID Screening)

{D0 * Disable Dialback Security (default)

Do not require a dialback number from the call originator.

{D1 * Enable Dialback Security

If Password Prompting is enabled in the answer Modemulator (see {Sn command) and this command is issued, then the Dialer must ask for a dialback.

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A "Dialback:" instead of "Login:" prompt will be displayed. The Dialer should type the phone number containing the Dialer's IP address (shown in the answer Modemulator's dialing directory).

The dialing Modemulator will display "Dialback Security" and disconnect. Both Modemulators will restart their Listener port. The answering Modemulator will wait S44 (default=15) seconds, and then dial the requested phone number (translated to IP address).

Example: answer's directory contains: 5551234 8888 172.17.2.1

answer has issued the {D1 command

Dialer calls answer Modemulator

at "Dialback:", Dialer types 5551234

answering Modemulator disconnects and dials back to 172.17.2.1:8888

If the Dialer is requesting Remote Command Mode (see the {R1 command), then after the Dialback is connected, the "Login:" prompt will be displayed, requiring an Administrator's password.

(See Appendix G Setting Up Dialback Security for more details)

{F0 * Allow Forwarding of Configuration Commands to Analog Modem (default)

Normally, an AT command containing a dial string with a phone number not found in the dialing directory will be forwarded in its entirety to the analog modem attached to the modem port.

{F1 * Disable Forwarding of Configuration Commands to Analog Modem

This command will cause only the dial string portion of the AT command (not the configuration commands) to be sent to the attached analog modem.

{I= * Program Caller ID

This must be the last command in the AT command string.

Enter the Caller ID string to be sent to the Listener during Modemulator handshake protocol. The CID string may be up to 23 numeric (0-9) digits. Attempting to enter a non-numeric character or more than 23 digits will return ERROR.

Example:

AT{I=18005551234

See Appendix G Caller ID Screening

To clear the Caller ID string, enter AT{I=<Enter>

{J0 * Normal Security and Login Banners (default)

The Security and Login banners will remain separate.

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AT{L Program Login Banner (up to 64 chars)...

{J1 * Concatenate (Join) Security and Login Banners

Issuing this command causes the space allocated for the 256 byte Security Banner to be contiguous with the 64 byte Login Banner, creating a 320 byte banner. This will remove the empty line between the banners.

\n will only be replaced with CRLF in the 256 byte Security Banner portion.

{L * Program Login Banner

This must be the last command in the AT command string.

When Password Prompting is enabled (see {Sn command), a Login Banner and login prompt will appear to the call originator. Use this command to program the desired Login Banner.

Factory default Login Banner: "USRobotics Courier M2M Modemulator Expansion Card"

After issuing this command, the following prompt will appear:

Type up to 64 displayable characters. When finished, press Enter.

(See the {J1 command to concatenate Security and Login Banners)

To clear the Login Banner, enter AT{L=<Enter>

{L? * Display Login Banner

Displays the programmed Login Banner.

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{M0 * Normal Modemulation (default)

Use normal Modemulation handshake protocol.

{M1 * Single-Ended Modemulation

When it is desired to connect to a TCP server or client that is not a Modemulator, the Modemulator handshake protocol must be disabled by issuing this command.

If S19 is zero, it will be set to 5 when Single-Ended is enabled. The User may change the inactivity timeout to any value from 1 to 255 minutes as desired, but attempting to set S19 to zero will result in a setting of 5 to allow for a secondary disconnect method, since there can be no heartbeats.

{O0 * Allow Answer Mode (default)

Whenever the Modemulator is in AT command mode, it will attempt to create a TCP server and be ready for a remote calling TCP client connection.

{O1 * Originate Only

Issuing this command will stop the TCP server (Listener) from being created, preventing answer mode.

{Pn=x * Grant or Deny Administrator Privileges for User n

When Password Prompting is enabled (see {Sn command), remote users must login in order to complete the connection. Use this command to grant (x=1) or deny (x=0) Administrator privileges to any User (n). User 0 is always an Administrator.

Administrator privileges are required in order for a User to gain access to the answer Modemulator's AT command set during a connection using Remote Command Mode (see the {R1

command).

Example to grant Administrator privileges to User 2:

AT{P2=1

{R0 * Normal Data Connections (default)

Normal data connections made without Remote Command Mode.

{R1 * Schedule Remote Command Mode on next Dial

If this command is issued, and the caller has Administrator privileges, then originating a call to a

remote Modemulator will place the remote in “Remote Command Mode”, allowing the caller to issue

most commands to the remote Modemulator. (See Appendix H)

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AT{S Security Settings...

Set Password Command Admin

----------------------- ------ AT{S0=Admin__Password (Admin) AT{S1=User_1_Password AT{P1=0 AT{S2=User_2_Password AT{P2=1 (Admin) AT{S3=User_3_Password AT{P3=0 AT{S4=User_4_Password AT{P4=0 AT{S5=User_5_Password AT{P5=0 AT{S6=User_6_Password AT{P6=0 AT{S7=User_7_Password AT{P7=0 AT{S8=User_8_Password AT{P8=0 AT{S9=User_9_Password AT{P9=0

AT{I=18005551234

When finished configuring the remote, you may either issue the O command to return to online data mode, or issue the H command or de-assert DTR to disconnect. Be sure to re-assert DTR before the next connection attempt. If the caller does not have Administrator privileges, "No Admin Privileges" will be displayed, and the caller will not be in Remote Command Mode.

{S * Display Security Settings

Example:

Modemulator User Guide

{Sn=p * Set Password for User n

In order to enable Password Prompting, an Administrator password must be programmed using the command 'AT{S0=p' where p is replaced with the desired password. Each password may contain up to 15 displayable characters (case sensitive) with no spaces.

User 0 is always an Administrator. Users 1 through 9 may be granted Administrator privileges using the {Pn command. Each time a new User (1-9) is added, it will default with no Administrator privileges.

All passwords must be unique.

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Example:

AT{S2=8]mYpasSwoRd[#!

To clear the password, enter AT{Sn=<Enter>

{W * Wipe Phone:Port:IPaddr Records

This must be the last command in the AT command string.

This command will erase all existing records in the local phone number translation directory.

You will be prompted: Are You Sure?

The User must press Y in order to proceed with the erasure.

(See the {Y command for programming records)

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AT{X

Listener Port: 8888

Phone Number Port IP Address

----------------------- ----- --------------18478742000 8888 172.18.3.2 18478742001 8888 172.18.3.3 4 8888 172.18.3.4

{X * Display Phone:Port:IPaddr Records

Display the Listener Port number, and all entries in the local phone number translation directory stored in the EEPROM. Toggle DTR off to abort.

(See the {Y command for storing entries)

Example:

{Y=n * Program Phone:Port:IPaddr Records

This must be the last command in the AT command string.

Modemulators can be drop-in replacements for analog modems. On the originate side, the legacy dial string can be sent as-is to the Modemulator.

By using this command, the Modemulator can be told how to translate the old phone number to a TCP client port number and IP address.

Phone numbers may contain only numeric digits 0-9 and commas for delay. (See S8 register) All other dial modifier characters will be accepted and ignored.

There is EEPROM space available for 7200 records in the dialing directory.

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Separate the phone number, port number, and IP address with ':' (colon) characters.

Example:

AT{Y=18478742000:2025:172.18.3.2

For new installations that are not replacing legacy analog modems, any phone number can be chosen (even a single digit). Just keep in mind that all phone numbers in the dialing directory must be unique.

Example:

AT{Y=4:2025:172.18.3.4

If using the default Listener port number (8888) on the remote Modemulator, you may optionally omit the port number.

Example:

AT{Y=4::172.18.3.4

(equivalent to AT{Y=4:8888:172.18.3.4)

Records may be deleted by specifying only the phone number. This will cause the last record in the dialing directory to be moved up to the empty slot.

Example:

AT{Y=4

(the above record would be deleted)

Records may be modified by simply reprogramming the same phone number with a new port number and/or IP address.

The Modemulator will prompt:

Replace Existing Record...

Are you sure [Y/N]?

Press Y to proceed, or N to abort.

Phone numbers may contain up to 23 digits, including commas.

Port numbers should generally be from 1000 to 65535.

Listener Port and TCP client port must match for a connection.

Phone numbers may be modified as long as the directory is not completely full (7200 entries).

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{Z=n * Program Listener Port Number for Answer Mode

This must be the last command in the AT command string.

Each time the Modemulator is in AT command mode, the cellular Gateway will be instructed to create a TCP server to listen on this port number. The factory default Listener port is 8888.

Example:

AT{Z=2025

If the User wishes to disable Listener mode, select Originate-Only by issuing the {O1 command.

To clear the Listener port number, enter AT{Z=<Enter>

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ATS$ S-Register Command Help (unrecognized commands accepted & ignored)

S0 Autoanswer Ring S59.1 ( 2) Enable CID S59.2 ( 4) Disable Cmd Fwd to Analog Port S2 Escape Char (ASCII) S59.3 ( 8) Single-Ended Modemulation S59.4 ( 16) Sched Remote Cmd Mode Next Dial S7 NO ANSWER Timeout (sec) S59.5 ( 32) Originate Only S59.6 ( 64) Concatenate Banners S8 Comma Dial Delay (sec) S59.7 (128) Enable Dialback Security

S19 Inactivity Timeout (mins) S60 TX Heartbeat Period (sec)

S21 Break Time (10 ms) S61 Maximum Latency (sec)

S22 Xon Char (ASCII) S64 Login Timeout (sec)

S23 Xoff Char (ASCII) S65 Analog Answer Timeout (sec)

S44 Leased Line Retry (sec)

S Registers

Use ATSx=y to set S register x to value y.

Use ATSx? to display the current value of S register x.

S$ * Display S Register Command Help Screen:

This command will not be forwarded to the analog modem.

S0 * Autoanswer Count (default=0)

S0=0 disables autoanswer (cellular and analog).

S0=1 causes the Modemulator to autoanswer and attempt a connection (cellular or analog) on the first RING.

S0 may range from 0 to 255, however the calling Modemulator would likely abort the connection attempt if S0 is set too high, because typically the NO ANSWER timeout is set to 60 seconds.

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S1 Ring Count

S1 is read-only. The I4 command will display the number of RINGs received so far in the S1 register.

S2 * ASCII Code for Escape Character (default=43, 0x2B=+)

This is the programmable character used for the escape sequence. The default character for the escape sequence to terminate a data connection is '+' (ASCII code decimal 43).

Issuing +++ during a data connection will cause the Modemulator to disconnect a cellular connection, and return to AT command mode.

If connected using the attached analog modem, it may enter local online command mode (depending on configuration). Issue ATH to disconnect.

S7 * NO ANSWER Timeout (default=60 seconds)

In analog calls, if the remote modem doesn't answer within this many seconds, the local Modemulator will report NO CARRIER.

In cellular calls:

If no RINGBACKs were received within half of this time, then the local Modemulator will report BUSY.

If at least one RINGBACK has been received, the local Modemulator will report NO ANSWER when S7 expires.

S7 will also control the connection attempt timeout in answer mode.

S8 * Comma Delay (default=2 seconds)

Each comma in the dial string will cause an extra delay before the CONNECT message is displayed (for applications that may require it).

S19 * Inactivity Timeout (minutes, default=0, disabled)

If no characters are sent or received for this many minutes, the local and remote Modemulator will disconnect and report NO CARRIER.

The Disconnect Reason will be INACTIVITY TIMEOUT.

S21 * Break Length (default=10, which is 100 ms)

Controls the length of the break signal (in 10 ms increments) generated and sent to the local DTE when a break token is received from the remote Modemulator. Set S21=0 to disable generation of break signals.

(See Appendix M Break Sequence Operation)

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S22 * ASCII Code for Xon Character (default=17, 0x11=ctrl-Q)

This is the programmable character used to represent Xon in S/W Flow Control (&H2).

(See Appendix F Flow Control)

S23 * ASCII Code for Xoff Character (default=19, 0x13=ctrl-S)

This is the programmable character used to represent Xoff in S/W Flow Control (&H2).

(See Appendix F Flow Control)

S44 * Leased Line Retry Timer (default=15 sec)

This register controls the number of seconds delay after a disconnect and restart of the Listener, that the Modemulator waits before attempting to reconnect to the remote Listener. This emulates the behavior of analog leased line modems.

(See &L1 command and Appendix L Leased Line Operation)

S44 is also used to delay the call for Dialback Security. See the {D1 command for a description of Dialback Security.

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S60 Setting

Result

heartbeat sent each 250 seconds if no data sent

1-19

heartbeat sent each 10 seconds if no data sent

20-29

heartbeat sent each 20 seconds if no data sent

30-39

heartbeat sent each 30 seconds if no data sent

40-49

heartbeat sent each 40 seconds if no data sent

S59 * Bitmapped Register (default=0)

Bit 0 (value=1) Reserved

Bit 1 (value=2) Enable Caller ID

See the {C command.

Bit 2 (value=4) Disable forwarding commands to analog port.

See the {F command.

Bit 3 (value=8) Single-Ended Modemulation

See the {M command.

Bit 4 (value=16) Schedule Remote Command Mode for the next cellular dial out

See the {R command.

Bit 5 (value=32) Originate Only

See the {O command.

Bit 6 (value=64) Concatenate Security & Login banners

See the {J command.

Bit 7 (value=128) Enable Dialback Security

See the {D command.

S60 * Heartbeat Period (default=20 seconds)

Heartbeat tokens can be sent from each Modemulator when there are no data bytes sent for a period of seconds. This allows the remote's receiver to detect long latency in the system (including the cellular network, all processors & buffers, etc.)

(See S61 Maximum Latency)

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S60 Setting

Result

50-59

heartbeat sent each 50 seconds if no data sent

60-69

heartbeat sent each 60 seconds if no data sent

70-79

heartbeat sent each 70 seconds if no data sent

80-89

heartbeat sent each 80 seconds if no data sent

90-99

heartbeat sent each 90 seconds if no data sent

100-109

heartbeat sent each 100 seconds if no data sent

110-119

heartbeat sent each 110 seconds if no data sent

120-129

heartbeat sent each 120 seconds if no data sent

130-139

heartbeat sent each 130 seconds if no data sent

140-149

heartbeat sent each 140 seconds if no data sent

150-159

heartbeat sent each 150 seconds if no data sent

160-169

heartbeat sent each 160 seconds if no data sent

170-179

heartbeat sent each 170 seconds if no data sent

180-189

heartbeat sent each 180 seconds if no data sent

190-199

heartbeat sent each 190 seconds if no data sent

200-209

heartbeat sent each 200 seconds if no data sent

210-219

heartbeat sent each 210 seconds if no data sent

220-229

heartbeat sent each 220 seconds if no data sent

230-239

heartbeat sent each 230 seconds if no data sent

240-249

heartbeat sent each 240 seconds if no data sent

250-255

heartbeat sent each 250 seconds if no data sent

If the remote Modemulator is firmware Rev 1.0.01, then the local Modemulator's heartbeat period will be limited to a maximum of 90 seconds.

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S61 * Maximum Latency (default=120 seconds)

When the local Modemulator's receiver sees no received data bytes or heartbeats for this time plus the remote Modemulator's Heartbeat Period (S60), then disconnect will occur and NO CARRIER will be displayed.

Maximum Latency disconnect can be disabled by setting this register to zero. If you set S61 to zero, it is strongly recommended that you enable the inactivity timeout (S19) for an alternative means to disconnect.

Range for S61 is 60-255, or zero.

S64 * Login Timeout (default=60 seconds)

If Password Prompting is enabled (see {Sn command): upon making a TCP connection and completing Modemulator handshake, a Login screen will be presented to the caller. If the caller does not login before the Login Timeout expires, a disconnect will occur.

Range for S64 is 30-255.

S65 * Analog Answer Timeout (default=15 seconds)

If autoanswer is off (S0=0), and an analog call is detected, but not answered, S65 will determine the number of seconds after the last Ring Indicate (RI) signal before aborting analog handshaking and reverting to normal operation.

S65 should be stored to EEPROM with the &W command because S65 is restored to the last saved value after an Analog Answer Timeout.

Range for S65 is 5-45.

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USRobotics recommends using a power cable between the external power supply unit and the gateway that has a wire thickness of 22 AWG!

Chapter 5: USR3520/USR803520 Technical Specifications

Physical

 1 Main Antenna Connection: 50 Ohm SMA female (WWAN Main)  1 Diversity Antenna/GPS Connection: 50 Ohm SMA female (WWAN Div / GPS)  1 10/100 Mbps RJ45 Connector  1 Power connector: 4 pin Micro-Fit™ 3.0, dual row, 2 circuits  7 3-color LEDs showing system status and signal strength  1 reset switch  1 internal SIM slot (1.8V/3V) - USIM/SIM Class B and Class C  DTE interface: 1 RS-232 DB9 Male connector  DCE interface: 1 RS-232 DB9 Female connector  2 LEDs indicators: system connect status, operating mode  1 mode switch: Modemulator/Gateway

Serial Port Ratings

 Terminal Port RS-232C DCE: Auto-baud detection of 115200, 57600, 38400, 19200, 9600, 4800,

2400, 1200, and 300 bps

 Modem Port RS-232C DTE: 115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, and 300 bps

Power

The symbol on the label at the bottom side of the gateway shows the power requirements:

 Input voltage must be between 9V - 33V DC  Internal electronic fuse limits the input current to 1.2A  Attached to 3G network, no Ethernet, 3G call @ 2100MHz (band I): 361mA

(All power measurements at 12V DC)

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SAFETY WARNING

This device operates on DC power provided via a DC power supply or AC power adapters. Only use power supplies in the range 9-33V DC and make sure the product is installed near a power outlet that is easily accessible. This product is regarded a class III equipment where protection against electric shock is provided by means of power supplied from a SELV (Safety Extra Voltage) circuit and does not generate hazardous voltages within itself.

SAFETY WARNING

When using an AC adapter make sure that the ambient temperature doesn’t

exceed the specified temperature limits of the AC adapter.

As a reference, the power supply available from USRobotics has the following parameters:

 Output voltage 12V DC  Max output current 1A

If an industrial power supply is preferred USRobotics recommends:

http://www.us.tdk-lambda.com/ftp/Specs/dspa.pdf

It can be sourced through Farnel, Mouser, Digikey, etc...

Power Connector

The power connector is a Micro-Fit connector from Molex (MX-43025-0400).

 Power Connector Drawing (PDF) --> http://support.usr.com/support/3510/files/molex_43025-

400_drawing.pdf

 Power Connector Datasheet (PDF) --> http://support.usr.com/support/3510/files/molex_43025-

400_datasheet.pdf

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Pinout

Modemulator User Guide

Radio Technology & Frequency Bands

 3G UMTS/HSDPA/HSUPA/HSPA+: 800- 850/900/1900/2100 MHz and AWS band (1700/2100MHz)

(B1, B2, B4, B5, B6, B8)

 2G GSM/GPRS/EDGE: 850/900/1800/1900 MHz  CDMA 1xRTT/EV-DO rev0/EV-DO revA (USR3520 only): 800/1900MHz (BC0, BC1)

Max. connectivity speeds

 HSPA+: 14.4Mbps (Cat 10) down, 5.76 (Cat 6) up  EV-DO RevA mode: 3.1Mbps FL / 1.8Mbps RL  HSPA+ Rel 7 SW features CPC (DTX/DRX), Enhanced L2, EF-DPCH

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GPS

• Assisted/Standalone GPS

o Standalone GPS, Assisted GPS, gps OneXTRA™ o Wideband GPS processing (20MHz) for improved measurement accuracy

• Embedded Standalone GPS

o Tracking sensitivity: -159 dBm o Cold start sensitivity: -145 dBm o Hot start sensitivity: -159 dBm o Open sky TTFF: cold start: 40 seconds o Open sky TTFF: super hot start: 1 second o Open sky accuracy: < 3M CEP -50

• NMEA sentences: GGA, GSA, GSV, RMC, VTG

Security

• Modemulator

o Connects over a secure private network o Support for 1 Administrator account and 9 User accounts o Caller ID Screening o Password Prompting o Dialback Security o Configurable security warning banner (up to 256 characters) o Configurable login banner (up to 64 characters)

• IPsec VPN

o Encryption: 3DES, AES128, AES 256 o Authentication: MD5, SHA1, SHA256 o Key Group: DH1, DH2, DH5, DH14

• Firewall

o DMZ o Inbound Port Forwarding o Outbound Port Filtering o Outbound Trusted IPs

Minimum System Requirements

• Cellular device-to-device routing (for peer-to-peer operation)

• Computer hardware/software:

o Ethernet port/web browser (for Gateway set-up) o RS-232 DTE port/terminal software (for Modemulator set-up)

• Optional peripheral hardware: RS-232 serial analog modem with access to PTSN

Command-line Interface

• Compatible with common Hayes modem AT commands

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Graphical User Interface

• HTML configuration is supported by most web browsers

Environmental

• Operating temperature: -30°C to 70°C

• Storage temperature: -40°C to 85°C

• Humidity operational: 5% - 95% non-condensing

• Operating altitude: up to 2000m

Enclosure Type

• Industrial Grade Aluminum

Mounting

• 6 through holes for M4 bolts - 2 x 2 compatible with VESA Mount MIS-D 75 (optional standard DIN

rail mounting interface)

Package Dimensions/Weight

• 8.5 x 5.55 x 2.5 in. (21.6 x 14.1 x 6.35 cm)

• 1.38 lb ( .63 kg)

Product Dimensions/Weight

• 4.53 x 4.13 x 1.77 in. (11.5 x 10.5 x 4.5 cm)

• 0.77 lb ( 0.35 kg)

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Troubleshooting and FAQs

General

If you have trouble with the USR3520/USR803520 first try the following:

 Try cycling the power off and on, then repeat the setup process.  Make sure the correct COM port was selected.  Consult the cellular service provider to verify that the Modemulator base unit is setup properly.  Make sure the power supply is plugged in to an operational power outlet, and that the power

supply is also securely plugged into the unit.

 Verify all cables and adaptors are correct for the type of ports.  Verify that the Modemulator card is fully seated in the base unit.  When power and interface cables are connected, type AT<Enter> to see if OK appears on the

terminal.

What are displayable characters?

"Displayable characters" are all ASCII characters from 20h thru 7Eh.

What are programmable characters?

All 3 of the programmable characters (Escape, Xon, Xoff) can be any ASCII character 00h thru 7Fh (0 thru 255 decimal).

What are dial modifier characters?

Dial modifier characters are any non-numeric displayable character following a dial (D) command. Examples of common dial modifier characters used in dial-up modems are:

P T , ; " W @ / R ! L S $

Also punctuation characters like - ) ( and <space> are dial modifier characters.

Dial modifier characters (except comma, colon, and L) in Modemulator dial commands that initiate cellular connections are ignored. Dial modifier characters in Modemulator dial commands that are forwarded to an attached dial-up modem are processed by the dial-up modem.

Can I use the SIM from my phone for Modemulator?

Generally no. The SIM from your phone is not provisioned for peer-to-peer data connectivity, which Modemulators require in order to emulate the analog PSTN and dial-up modems.

However, depending on how your SIM is provisioned, it may allow connectivity to the Internet, and Modemulator can use this type of connectivity when operating in single-ended mode to originate a connection to the IP address of a TCP/IP server.

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What type of screwdriver do I need for installing a SIM or an expansion card?

The gateway base unit panels are fastened by Torx T6 screws, so a Torx T6 screwdriver is required to remove a panel. Torx is the tip style, and is also called “star” or “6-point”. T6 is the tip size.

What is peer-to-peer?

Peer-to-peer is a communications model in which each party has the same capabilities and either party can initiate a communication session. Peer-to-peer devices are capable of originating or answering a connection. Dial-up modems are an example of a peer-to-peer device.

What is point-to-point?

Point-to-point is a type of communications connection in which one device has an exclusive connection with one other device. The Public Switched Telephone Network (PSTN) is an example of a point-to-point network. An RS-232 serial link is another example.

Can I enable both Caller ID Screening and Password Prompting?

Yes. With Caller ID Screening and Password Prompting both enabled, a Modemulator connection will first validate the originating Modemulator with Caller ID Screening, then prompt for a password. If either authentication fails the connection will not complete.

Can I enable both Caller ID Screening and Dialback Security?

Yes. With Caller ID Screening and Dialback Security both enabled, a Modemulator connection will first validate the originating Modemulator with Caller ID Screening, then prompt for a dialback number. If either authentication fails the connection will not complete. When it does complete successfully, it will only connect to an IP address listed in the Answerer’s phone directory.

Why does an originating Modemulator report BUSY?

Cellular data networks are packet-switched networks, and packets can be significantly delayed when travelling large distances from one Modemulator to another. One reason an originating Modemulator can report BUSY is when the total network delay exceeds the Modemulator busy timeout. Increasing the originating Modemulator’s S7 setting may help by increasing the busy timeout.

Can I connect to the IP address reported by the USR3520/USR803520?

When the cellular service is provided by a Mobile Network Operator (MNO), the IP address reported by the USR3520/USR803520 GUI or I7 screen may be public and routable. Normally this IP address provided by

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the MNO will be dynamic so it will change periodically, and the MNO may block access to this IP address with a firewall.

When the cellular service is provided by a Mobile Virtual Network Operator (MVNO), the IP address reported by the USR3520/USR803520 GUI or I7 screen is not public and routable. The reported IP address is used only by the MVNO to route traffic to the USR3520/USR803520 on the cellular operator’s network. The MVNO will translate the IP address using Network Address Translation (NAT) and provide you with a different routable IP address, but the USR3520/USR803520 cannot report that IP address. The MVNO will control whether your IP address is private or public, and static or dynamic.

How do I configure a Modemulator for connection to the Vodafone UMTS network?

1. The Vodafone network requires any cellular device to report a Username and Password in order for the

cellular connection to complete. The Username and Password are not assigned by Vodafone or by an MVNO, so an arbitrary Username and Password can be chosen by the User. Consult the

USR3520/USR803520 Gateway User Guide for instructions on entering a Username and Password.

2. Follow the instructions in the USR3520/USR803520 Gateway User Guide for selecting the “Generic

UMTS” network setting in the embedded GUI.

3. Enter the APN given by your cellular service provider. Consult the USR3520/USR803520 Gateway User

Guide for instructions on entering an APN.

4. The embedded GUI of the USR3520/USR803520 has a “Connect while on international roaming”

feature. Depending on how the Vodafone SIM is provisioned and on the geographical location of the gateway, you may need to enable this setting.

The SIM is programmed with a Mobile Network Code (MNC) and a Mobile Country Code (MCC). When a cellular device is connecting to a cellular network, the device receives the network’s MNC and MCC which it compares to the MNC and MCC programmed in the SIM. If the SIM MNC doesn’t match the network MNC, a roaming connection is established if the cellular service allows roaming to that local cellular network. If also the SIM MCC doesn’t match the network MCC, the connection is international roaming. Contact your cellular service provider to determine your SIM’s home country, and whether roaming to your local cellular network is allowed.

How do I restore the Modemulator expansion card to factory settings?

To restore the Modemulator operating parameters in the i4 screen to factory values and make the factory values non-volatile, enter this command string:

AT&F1&W <enter>

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To restore all other Modemulator configurations to factory default, enter the commands below as needed. There is no need to restore configurations that are already at factory default.

Erase security banner:

AT{B <enter> <enter>

Restore factory login banner:

AT{L <enter> "USRobotics Courier M2M Modemulator Expansion Card" <enter>

Erase caller ID string:

AT{I= <enter>

Delete all passwords:

AT{S0= <enter> AT{S1= <enter> AT{S2= <enter> AT{S3= <enter> AT{S4= <enter> AT{S5= <enter> AT{S6= <enter> AT{S7= <enter> AT{S8= <enter> AT{S9= <enter>

Disable all Administrator privileges:

AT{P1= <enter> AT{P2= <enter> AT{P3= <enter> AT{P4= <enter> AT{P5= <enter> AT{P6= <enter> AT{P7= <enter> AT{P8= <enter> AT{P9= <enter>

Erase all dialing directory entries:

AT{W <enter> y <enter>

Restore default Listener port:

AT{Z=8888 <enter>

Why do I need an M2M data plan with the Modemulator?

The Modemulator emulates the behavior of an analog modem, but actually connects over a cellular network instead of the legacy Public Switched Telephone Network (PSTN). Any device that connects to a cellular network must subscribe to a cellular service plan.

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Standard Ethernet cable Cisco Terminal adaptor

Gender changer

USR Modemulator

port

Cisco RJ45

RJ45 to DB9F

DB9M to DB9M

Cisco DB9F-to-RJ45

TERMINAL Adaptor

DB9M/DB9M

Gender Changer (Coupler)

Also, since the Modemulator is sending and receiving digital data (not voice), the cellular service must be a data plan (not a voice plan).

And in order to emulate the operation of the legacy PSTN, the cellular data plan must be provisioned for peer-to-peer connectivity and static IP addressing. These provisioning features are available only from an M2M cellular data plan (not from consumer cellular data plans).

Can the Modemulator connect simultaneously to several remote sites?

No, the Modemulator emulates the behavior of dial-up modems and the PSTN, which allows only point-topoint connections from one endpoint to one other endpoint. A Modemulator must disconnect before a connection to another site can be made.

Can I use the Modemulator to connect to an analog site over the cellular network?

No. A dial-up modem sends and receives analog signals that can connect only to another analog modem. Modern cellular networks don’t contain analog modems and don’t offer analog services. The voice services that cell phones use are actually sending and receiving digital voice, not analog.

And also, cellular modem and gateways make data connections, not digital voice connections. The cellular network’s digital voice service is too low-fidelity to carry a dial-up modem’s analog signal.

For an overview of cellular networking and the legacy PSTN, download the Cellular to Cellular Data

Communications whitepaper.

Can the Modemulator be connected to the console port of a Cisco router?

Yes, with the proper cable and adaptors, and with the proper settings, the Modemulator can connect to a Cisco console port.

The Cisco console port is a serial port which can connect to the Modemulator’s Terminal port. It may be

useful to consult Cisco’s online Cabling Guide for Console and AUX Ports.

For example, if the Cisco console port is presented on an RJ45 connector, one way to make the connection is as follows:

Console port

(not rollover)

DB9F Terminal

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Also, the Cisco console port will require the Modemulator to be pre-configured with certain settings. For example, if the Cisco console port requires the Modemulator to be pre-configured for 9600bps 8-N-1 serial format:

1. Connect a computer’s serial port to the Modemulator’s Terminal port with a serial cable and set the

computer’s serial parameters for 9600bps 8-N-1.

2. Enter any AT command to establish the 9600bps 8-N-1 serial settings in the Modemulator.

3. Use the &W command to save those serial setting into the Modemulator’s non-volatile memory.

The Cisco console port may work best with the Modemulator (or any modem) pre-configured for DTR override, flow control off, quiet mode, command echo off, and autoanswer on. It may be useful to consult Cisco’s online guide for Attaching a USRobotics Modem to the Console Port of a Cisco Router to see their recommendations for configuring a USRobotics analog modem, and apply those recommendations to the Modemulator as needed.

Contact USRobotics technical support if these troubleshooting tips did not solve your issue.

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Glossary of Terms

APN Access Point Name

ASCII American Standard Code for Information Interchange

CD Same as DCD, Data Carrier Detect

CID Caller ID

CRLF Carriage Return/Line Feed control character pair

CTS Clear To Send, used for H/W TXD flow control

DCD Data Carrier Detect

DCE Data Communication Equipment, such as a modem

DSR Data Set Ready (sometimes known as Modem Ready)

DTE Data Terminal Equipment, such as a computer

DTR Data Terminal Ready

ECIO Ratio (dB) of rcvd energy per code bit to interference level

EEPROM Electrically Erasable Programmable Read Only Memory

F/W Firmware

GUI Graphical User Interface

H/W Hardware

IMEI International Mobile-station Equipment Identity

IMSI International Mobile Subscriber Identity

IP Internet Protocol

MEID Mobile Equipment IDentifier

MVNO Mobile Virtual Network Operator

NVRAM Non-Volatile Random Access Memory

PSTN Public Switched Telephone Network

RAM Random Access Memory

RI Ring Indicate

RTS Request To Send, used for H/W RXD flow control

RX Receive

RXD Receive Data

S/W Software

TCP Transmission Control Protocol

TX Transmit

TXD Transmit Data

UTC Universal Time, Coordinated

WWAN Wireless Wide Area Network

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Product

Model Number

Courier Modemulator & 3G M2M Cellular Gateway

3520

Upgraded Product

Model Number

USRobotics Courier M2M 3G Cellular Gateway

3510

USRobotics Courier Modemulator Expansion Card

3516-EMU

Country

Webmail

United States & Canada

http://www.usr.com/emailsupport

Austria

www.usr.com/emailsupport/de

Belgium (Flemish)

www.usr.com/emailsupport/nl

Belgium (French)

www.usr.com/emailsupport/be

Czech Republic

www.usr.com/emailsupport/cz

Support

1. Be prepared to provide model and serial numbers.

The USR3520 has two serial numbers, the base unit serial number and the Modemulator expansion card serial number. A USR3510 that was upgraded to a USR3520 also has two serial numbers, the base unit serial number and the Modemulator expansion card serial number.

 The base unit serial number is on the side of the package, bottom of the unit, and is shown

on the Modemulator I7 screen on the line labeled Cellular S/N.

 The Modemulator expansion card serial number is shown on the Modemulator I7 screen on

the line labeled Modemulator S/N. If the Modemulator is not responding to the I7 command, remove power from the unit and uninstall the Modemulator expansion card to find the Modemulator expansion card serial number on the expansion card label.

2. Visit the Support section of the USRobotics Web site at www.usr.com/support/3520

Many of the most common issues that users experience have been addressed in the FAQ and Troubleshooting Web pages for the USR3520. The Support Web pages also contain information on the latest firmware, application software, and documentation updates.

3. Submit a technical support question to the USRobotics Technical Support Department using an

online form:

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Country

Webmail

Denmark

www.usr.com/emailsupport/ea

Finland

www.usr.com/emailsupport/ea

France

www.usr.com/emailsupport/fr

Germany

www.usr.com/emailsupport/de

Greece

www.usr.com/emailsupport/gr

Hungary

www.usr.com/emailsupport/hu

Ireland

www.usr.com/emailsupport/uk

Italy

www.usr.com/emailsupport/it

Luxembourg

www.usr.com/emailsupport/be

Netherlands

www.usr.com/emailsupport/nl

Norway

www.usr.com/emailsupport/ea

Poland

www.usr.com/emailsupport/pl

Portugal

www.usr.com/emailsupport/pt

Russia

www.usr.com/emailsupport/ru

Spain

www.usr.com/emailsupport/es

Sweden

www.usr.com/emailsupport/se

Switzerland

www.usr.com/emailsupport/de

Turkey

www.usr.com/emailsupport/tk

United Kingdom

www.usr.com/emailsupport/uk

For additional current support contact information, go to: http://www.usr.com/en/international/

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Dec

Hex

Char

Dec

Hex

Char

Dec

Hex

Char

Dec

Hex

Char

NUL

DC2

24 $

SOH

XOFF

25 %

37 7 02

STX

DC4

26 &

ETX

NAK

27 ë

39 9 04

EOT

SYN

28 (

3A : 05

ENQ

ETB

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ACK

CAN

2A *

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BEL

EM 43

2B +

BS 26

SUB

2C '

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HT 27

ESC

2D -

LF 28

FS 46

2E .

40 @ 11

VT 29

GS 47

2F /

FF 30

RS 48

30 0

42 B 13

CR 31

US 49

31 1

43 C 14

SO 32

SP 50

32 2

SI 33

21 !

33 3

45 E 16

DLE

34 4

XON

23 #

35 5

Appendicies

Appendix A: ASCII Chart

Modemulator User Guide

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Dec

Hex

Char

Dec

Hex

Char

Dec

Hex

Char

Dec

Hex

Char

48 H

56 V

100

64 d

114

72 r 73

49 I

57 W

101

65 e

115

73 s 74

4A J

58 X

102

66 f

116

4B K

59 Y

103

67 g

117

4C L

5A Z

104

68 h

118

76 v 77

4D M

5B [

105

69 i

119

77 w 78

4E N

5C \

106

6A j

120

4F O

5D ]

107

6B k

121

79 y 80

50 P

5E à

108

6C l

122

51 Q

5F _

109

6D m

123

7B { 82

52 R

60 `

110

6E n

124

7C | 83

53 S

61 a

111

6F o

125

}

54 T

62 b

112

70 p

126

55 U

63 c

113

71 q

127

DEL

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Appendix B: Excessive Data Usage Warning

There are two default settings that can cause unintentional billable cellular data usage: LAN to WAN and Auto Provisioning.

1. By default LAN to WAN routing is turned on. Once the gateway is connected to a cellular data network

it will route all of the attached computer’s Internet traffic through the cellular data network. To prevent this cellular data usage, either turn off LAN to WAN or exit out of all programs that use the Internet while configuring the gateway for its intended use. Otherwise, computer Internet traffic will continue to use the LAN to WAN routing until the cellular gateway is disconnected.

2. By default auto provisioning is also turned on. This means that the gateway will connect to the USR

Universe and check for updates each time it is powered on. If an update is available the gateway will automatically download and install the update. USR recommends auto provisioning only if the product is properly registered on the USR Universe. If the product is not registered, or if the gateway has a low cellular data rate plan, disable auto provisioning and check for updates manually to avoid the extra data usage.

Do not manually or automatically update the gateway if a USR3510/USR803510 was upgraded to a USR3520/USR803520. The update will remove the Modemulator upgrade.

How to disable LAN to WAN

Before installing a SIM card or setting-up the carrier information, connect a computer’s Ethernet port to the gateway’s Ethernet port with a standard Ethernet cable, then open a web browser on the computer

and enter the address 192.168.1.1 into the address bar. Enter the default username (admin) and password (admin). After a successful login, the Home screen will appear.

Click on the Firewall Tab.

Change the LAN -> WAN from Accept to Reject and click Save changes.

Now continue to configure the gateway as needed.

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If the application requires LAN to WAN routing, close any programs running on the attached computer that might be using the Internet before returning to this page to re-enable LAN to WAN.

Closing Programs

If LAN to WAN routing is left enabled during the configuration process, USR strongly recommends closing any programs that might be using the Internet (web browsers, instant messengers, email programs, etc.) before connecting the gateway to a cellular network. Be sure to close any programs that are running in the background; e.g. auto updates or anti-virus. There are applications available that provide a list of current network activity like Windows’ Resource Monitor that can be used as a guideline.

Auto Provisioning

By default the gateway connects to the USR Universe each time the device is powered on, and checks for an updated image file. The gateway will automatically download and install updates from the USR Universe over the cellular connection. If the product is not properly registered on the USR Universe, or to reduce cellular data usage, disable auto provisioning and manually check for updates. If auto provisioning is turned off, USR strongly recommends checking for updates on a regular basis to manually update the gateway when updates are available.

How to Disable Auto Provisioning

and enter the address 192.168.1.1 into the address bar. Enter the default username (admin) and password (admin). After a successful login, the Home screen will appear.

Click on the Provisioning Tab.

To disable this feature go to Settings, then next to Enable automatic provisioning click No and click Save Changes.

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Appendix C: DTE Interface Requirements

Baud rate and parity are automatically detected for each AT command.

Baud rate must be one of the following:

300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200

Parity must be one of the following:

8N1 - 8 data bits, no parity, 1 stop bit

7E1 - 7 data bits, even parity, 1 stop bit

7O1 - 7 data bits, odd parity, 1 stop bit

7M1 - 7 data bits, mark parity, 1 stop bit

7S1 - 7 data bits, space parity, 1 stop bit

7M1 is the same as 7 data bits, no parity, 2 stop bits

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Appendix D: Result Codes

0/OK Command has executed

1/CONNECT Successfully connected with another Modemulator

2/RING Incoming RING detected from remote Modemulator

3/NO CARRIER Data connection has terminated

4/ERROR Command is invalid or DSR not asserted

6/NO DIAL TONE Network TCP connection attempt timed out

7/BUSY Cellular: half of S7 expired with no ringbacks

8/NO ANSWER Ringback(s) detected, but S7 expired

10/REFUSED Caller ID failed authentication

11/RINGING Remote Modemulator is displaying RING

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Appendix E: ATI6 Disconnect Reasons

1. None

No connection has been made since reset, or in Remote Command Mode while still connected.

2. DTR dropped

DTR was de-asserted by the local DTE on the RS-232 interface.

3. Escape Code

Escape Code (default='+++') was issued by the local DTE.

4. Loss of Carrier

Gateway or analog modem de-asserted DCD.

5. Inactivity Timeout

Local or remote Modemulator disconnected due to data inactivity.

6. DISC Received

Remote Modemulator disconnected (unspecified reason).

7. Link Timeout

Local Modemulator disconnected due to network latency.

8. Keypress Abort

A key was pressed during connection handshake.

9. Refused

Caller ID failed authentication at the Listener end.

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Appendix F: Flow Control

1. Hardware Flow Control

H/W Transmit Flow Control

When the Modemulator's incoming transmit data buffer is getting full, it will de-assert the Clear to Send (CTS) signal on the RS-232 interface, which commands the local DTE to stop sending transmit data to the Modemulator. When sufficient space becomes available, CTS will be reasserted, enabling data flow.

H/W Receive Flow Control

If set to &R2, the Modemulator will obey the incoming Request to Send (RTS) signal, sending or stopping receive data to the local DTE.

2. Software Flow Control

S/W Transmit Flow Control

When the Modemulator's incoming transmit data buffer is getting full, it will send the programmable Xoff character to the local DTE, which commands the DTE to stop sending transmit data to the Modemulator. When sufficient space becomes available, the programmable Xon character will be sent, enabling data flow.

Modemulator User Guide

S/W Receive Flow Control

If set to &I1 or &I2, the Modemulator will obey the incoming Xon/Xoff flow control characters, sending or stopping receive data to the local DTE. &I1 will pass Xon/Xoff through to the remote Modemulator, while &I2 will not.

S/W flow control should not be used for binary file transfers, since Xon and Xoff characters in the data could be falsely interpreted as flow control.

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Appendix G: Dial Security

This appendix contains information about:

 Setting up Caller ID Screening  Setting up Password Prompting  Granting Administrator Privileges To A User  Setting up Dialback Security

Overview

Dial Security is designed to protect networks and data centers from unauthorized access. There are three forms of Dial Security; each will be explained later in this appendix:

 Caller ID Screening  Password Prompting  Dialback Security

You should be familiar with these terms before you continue:

Remote site: One of multiple locations where a Modemulator is attached to equipment that transfers data to or from a host site.

Host site: The single location where a Modemulator is attached to a terminal or application server that transfers data to or from multiple remote sites.

Remote Modemulator: A Modemulator attached to equipment at a remote site. In a peer-to-peer system a remote Modemulator may originate or answer a connection.

Host Modemulator: A Modemulator attached to a terminal or application server at a host site. In a peerto-peer system a host Modemulator may originate or answer a connection.

Administrator: With Password Prompting enabled in an answering Modemulator, an Administrator is a person or application that has privileges to contact the answering Modemulator to remotely configure it or to transfer data to/from the equipment attached to its Terminal port.

With Password Prompting disabled, any person or application has privileges to contact and remotely configure the answering Modemulator, and to transfer data to/from the equipment attached to its Terminal port.

User: With Password Prompting enabled in an answering Modemulator, a User is a person or application that has no privileges to remotely configure the answering Modemulator, but is allowed to contact the answering Modemulator and transfer data to/from the equipment attached to its Terminal port.

Any User can be granted Administrator privileges by the default Administrator or any other User that has Administrator privileges.

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Setting Up Caller ID Screening

An originating Modemulator has the option of sending a Caller ID (CID) number during the connection handshake.

If the answering Modemulator has CID enabled, it will compare the received CID number with the phone numbers stored in its dialing directory. If the CID number is not found, the connection will fail and the originating Modemulator will display REFUSED.

Caller ID cannot be used when the answering Modemulator is operating in single-ended mode.

In the case of Modemulators replacing legacy dial-up modems, it is recommended that each originating Modemulator CID number be programmed with its former PSTN phone number. Each answering Modemulator should have an entry in its dialing directory containing the originator’s phone number.

The User can, however, select any numeric string (up to 23 digits) as a Caller ID number, as long as the answering Modemulator has a corresponding entry in its dialing directory.

The originating and answering Modemulator must both be configured to enable Caller ID, which can be done locally (pre-deployment) or remotely (post-deployment). The following steps will describe how to do local configuration. To do remote configuration, see Appendix H for details about using Remote Access.

Here are the steps for locally setting up Caller ID Screening:

1. Enter a CID number in the originating Modemulator  Connect a computer serial port to the originating Modemulator Terminal port with a serial cable.

Run a terminal application on the computer to facilitate sending commands into the Modemulator.

 Use the {I command to enter the Caller ID number that will be sent to the Listener during

Modemulator handshake protocol. The CID number may be up to 23 numeric (0-9) digits. Attempting to enter a non-numeric character or more than 23 digits will return ERROR.

Example:

AT{I=18005551234

The number written by the {I command is automatically stored to EEPROM. It does not require you to send &W.

2. Enable CID in the originating Modemulator  Issue the {C1 command to enable CID in the originating Modemulator.

Example:

AT{C1&W

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The {C setting is not automatically written to EEPROM. Send &W to maintain the S registers after a reset.

3. Enter the CID number of the originating Modemulator into the answering Modemulator’s dialing