COURIER HST USRobotics is a registered trademark and Courier HST is a trademark of U.S. Robotics, Inc. Touch-Tone is a trademark of American Telephone and Telegraph. InterBridge is a trademark of Hayes Microcomputer Products, Inc. MCI Mail is a service mark of MCI Communications, Inc. Microcom Networking Protocol (MNP) is a trademark of Microcom, Inc. Sprint is a trademark of General Telephone and Electric. TABLE OF CONTENTS Limited Warranty vii FCC Registration Numbers viii Connecting to the Telephone Company viii Radio and Television Interference viii For Canadian Modem Users ix How to Use this Manual x PART I. INSTALLATION AND OPERATION CHAPTER 1 -- Introduction 1-1 Advanced Features The Courier Product Family Compatibility CHAPTER 2 -- Set-Up and Testing 2-1 Package Components Operational Requirements Assembling the Modem Testing CHAPTER 3 -- Operations at a Glance 3-1 Data Format Error Control Data Compression Dialing HST-Compatible, 9600 bps MNP-Compatible, 2400 or 1200 bps Non-MNP Compatible, 2400, 1200, 300 bps Flow Control Maximum Throughput High-Speed Channel Turnaround Link Negotiation Data Rate Defaults i COURIER HST Nonvolatile Memory (NRAM) Phone Number Storage Dialing Stored Numbers Busy Answer Inactivity Timer ii COURIER HST CHAPTER 4 -- Interface Controls 4-1 Terminology Throughput Guidelines Error Control ARQ Retry Timeout Online Data Rate Fallback Error Control Modes (&Mn) With Auto Answer Data Compression Mode (&Kn) Flow Control Transmit Data Flow Control (&Hn) Hardware Control Software Control Received Data Flow Control Hardware Control (Rn) Software Control (&In) Data Rate Commands Variable Rates Fixed Rates Maximum Throughput Settings DTE Rate Select (&Bn) Link Rate Select (&Nn) DSR Override (&Sn) CHAPTER 5 -- Internal Controls 5-1 Setting/Using Defaults Writing Defaults to NRAM (&W) Loading the Factory Defaults (&F) Resetting to NRAM Defaults (Z) Storing Telephone Numbers (&Zn=s) Result Codes Response Modes (Vn) Result Code Sets (Xn) Quiet Mode (Qn) /ARQ Result Codes Local Echo Command Mode Local Echo (En) Online Local Echo (Fn) The Audio Monitor Speaker Control (Mn) Modem Clock Usage (Kn) Transmitter Enable/Disable (Cn) Break Handling (&Yn) The S-Registers iii COURIER HST CHAPTER 6 -- Dialing and Answering 6-1 Basic Requirements Transmission Rate Error Control Automatic Retrain Placing Calls Dial Command (D) Dialing Type, X0 or X1 Setting Adaptive Dialing, X2-X6 Settings Pause (,) Dial and Return to Command Mode (;) Dialing Letters (") Transferring Calls (!) Wait for a Second Dial Tone (W) Wait for an Answer (@) Reversing Originate/Answer Frequencies (R) Canceling Dialing (any key) Redialing Re-execute the Last Command (A/) Automated Redialing (>, A>) Continuous Repeat (>) Continuous Re-Execute (A>) Exiting Repeat Mode Dialing a Stored Number (DSn) Escape Code Operations (+++) Modem Response to +++ Returning Online (O) Hanging Up (Hn) Automatic Answering Suppressing Auto Answer Points to Remember International Calls U.S./CCITT Answer Tone (Bn) Guard Tone (&Gn) Pulse Dial Make/Break Ratio (&Pn) Chapter 7--Queries and Help Screens 7-1 User Inquiries (In) S-Register Query (Sr?) S17 S20 Phone Number Query (&Zn?) Help Screens Basic Command Set ($) Extended Command Set (&$) Dialing (D$) S-Register Functions (S$) iv COURIER HST PART II. REFERENCE Appendix A--Error/Flow Control Concepts MNP Level Negotiation Throughput Level 1 Level 2 Level 3 Level 4 Level 5 Error Detection/Retransmission Flow Control Example 1--Transmit Data Example 2--Received Data Appendix B--Summaries and Tables B-1 The RS-232C Interface, with Pin Definitions Front End Indicators DIP Switch Summary Default Settings S-Register Summary ASCII Chart Appendix C--Alphabetical Command Summary C-1 Appendix D--Problems and Solutions D-1 If You Still Have Problems Appendix E--Additional Operational Information E-1 Using Both Voice and Data Communications High Speed/Low Speed Protocol Retrain Sequence PBX, Dedicated Line, and Leased Line Operations Hewlett Packard Installations Analog Loopback and Other Tests Appendix F--Technical Specifications F-1 Glossary G-1 Index v COURIER HST LIMITED WARRANTY U.S. Robotics, Inc., warrants to the original consumer or other end user purchaser that this product is free from defects in materials or workmanship for a period of two years from the date of purchase. During the warranty period, and upon proof of purchase, the product will be repaired or replaced (with the same or similar model) at our option, without charge for either parts or labor. This warranty shall not apply if the product is modified, tampered with, misused, or subjected to abnormal working conditions. ----------------------------------------------------------------- REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE EXCLUSIVE REMEDY OF THE PURCHASER. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE, AND U.S. ROBOTICS SHALL IN NO EVENT BE LIABLE TO PURCHASER FOR INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND OR CHARACTER. ----------------------------------------------------------------- Some states do not allow the exclusion or limitation of incidental or consequential damages or allow limitations on how long an implied warranty lasts, so the above limitations or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. To obtain service under this warranty, contact the U.S. Robotics Technical Support Department at 800/982-5151 (in Illinois, 312/982-5151), or by mail at 8100 North McCormick Blvd., Skokie, Illinois, 60076. You will be given a Return Materials Authorization (RMA) number to help us keep track of your warranty request. Once you have received your RMA number, take or mail the product, postage prepaid, to U.S. Robotics at the above address. Include proof of the date of purchase. IMPORTANT: If you ship your unit, pack it securely, be sure your RMA number is visible on the outside of the package, and ship it charges prepaid and insured. Should you encounter problems in operating this device, follow the instructions in Appendix D in Part II of this manual. The Appendix contains solutions to operating problems as well as procedures to follow if there is an apparent modem malfunction. vi COURIER HST FCC REGISTRATION NUMBERS FCC68: CJE794-11323-DM-E RINGER EQUIVALENCE: 0.4B FCC15: CJE794FAST CONNECTING TO THE TELEPHONE COMPANY It is not necessary to notify the telephone company before installing the modem. However, the telephone company may request the telephone number(s) to which the Courier is connected and the FCC information printed above. If the telephone company has any questions or raises problems, ask them to call the Technical Support Department, USRobotics, Inc., 800/982-5151 (in Illinois, 312/982-5151). If the modem is malfunctioning, it may affect the telephone lines. In this case, disconnect the modem until the source of the difficulty is traced. Do not use the modem on party or coin telephone lines. RADIO AND TELEVISION INTERFERENCE This equipment generates and uses radio frequency energy and if not installed and used properly, in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. The Courier HST has been tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this device does cause interference to radio or television reception, which you can determine by monitoring reception when the modem is on and off, try to correct the problem with one or more of the following measures. Reorient the receiving antenna. Relocate the computer with respect to the receiver. Relocate the computer and/or the receiver so that they are on separate branch circuits. If necessary, consult your dealer or an experienced radio/television technician for additional suggestions. You may find the following booklet, prepared by the Federal Communications Commission, helpful: vii COURIER HST How to Identify and Resolve Radio-TV Interference Problems Stock No. 004-000-0345-4 U.S. Government Printing Office Washington, DC 20402 viii COURIER HST FOR CANADIAN MODEM USERS The Canadian Department of Communications (DOC) label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational, and safety requirements. The department does not guarantee the equipment will operate to a user's satisfaction. Before installing this equipment, make sure you are permitted to connect it to the facilities of the local telecommunications company. You must also install the equipment using an acceptable method of connection. In some cases, you may also extend the company's inside wiring for single line individual service by means of a certified connector assembly (telephone extension cord). You should be aware, however, that compliance with the above conditions may not prevent degradation of service in some situations. Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by a user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment. For your own protection, make sure that the electrical ground connections of the power utility, telephone lines, and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas. CAUTION: Do not attempt to make such connections yourself; contact the appropriate electric inspection authority or electrician. Courier HST Modem Load Number: 38B The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to the telephone loop used by the device, without overloading. The termination on a loop may consist of any combination of devices, subject only to the requirement that the total of the Load Numbers of all the devices not exceed 100. An alphabetic suffix is also specified in the Load Number for the appropriate ringing type (A or B), if applicable. For example, LN = 38B designates a Load Number of 38 and a B-type ringer. ix COURIER HST HOW TO USE THIS MANUAL This manual is divided into two parts. The first part is designed to aid you in getting your modem connected and operating as quickly as possible. Part I also includes chapters on command usage. Part II contains a number of informative appendixes that you may or may not need, depending on your situation, plus a Glossary and Index. Below is a brief description of the manual's contents. We suggest you review at least Chapters 1-3 before operating the modem. o Chapter 1 -- Introduction o Chapter 2 -- Assembling and testing the modem o Chapter 3 -- Immediate operations -- essentials o Chapter 4 -- Interface controls o Chapter 5 -- Internal controls o Chapter 6 -- Calling, answering and disconnecting o Chapter 7 -- Inquiries and Help screens The appendixes in Part II cover the following subjects: o Background information on error and flow control o Summaries and tables o Problems, their causes, and solutions o Additional operational information o Technical specifications x