Knowledge Base

PC Ext: Dip Switch Settings Incorrect in USRHST Modem Script

Article ID: 129236

Article Last Modified on 10/30/2006

APPLIES TO

This article was previously published under Q129236

SYMPTOMS

An External using a USR Courier HST Dual Standard with ASL modem, version 32bis with ASL modem, or HST with ASL modem and using version 3.2 of the USRHST script either: fails to initialize or connects successfully on the first call from a remote client or PO and then fails to answer or answers without connecting on subsequent calls until rebooted.

CAUSE

The Dip switch settings on the modem may be incorrect. The settings shown in the header of the version 3.2 USRHST.MDM script are reversed, and if you set them (or have already set them) according to the version 3.2 script, the problem will continue.

The setup string in the initialize section of the script may (depending on the setting of sw's 3, 7, and 8) override the switches and allow the first call to succeed. However, at the end of the first call, the reset section issues an ATZ that resets the modem according to the dip switches, and the External ceases to answer calls until it is forced to re-initialize the modem.

RESOLUTION

In order for the version 3.2 script to work correctly, you need to set the switches according to the version 3.0 script: 
;       Filename: usrhst.mdm
;       Date    : June 17, 1992
;       Script  : Script file for USRobotics Courier HST dual standard
                  modem

;       Version : V3.0
;
;     This modem has a bank of DIP-Switches on the back. These should
;  be set at the factory settings or as follows:
;
;                        QUAD  1  2  3  4  5  6  7  8  9  10
;                OFF     XXXX  X              X  X     X   X
;                ON               X  X  X  X        X
Note that switches 2 and 4 are not the factory settings.

The 1-10 switches are defined in the USR documentation as: 
Switch        Function
-----------------------------------------------------------------------

  1          OFF Normal DTR operation
             ON  DTR always on
  2          OFF Verbal result codes
             ON  Numeric result codes
  3          OFF Results suppressed
             ON  Results enabled
  4          OFF Command echo on
             ON  No command echo
  5          OFF Modem answers on first ring
             ON  Autoanswer disabled
  6          OFF CD on active connection
             ON CD always on
  7          OFF Result codes in originate and answer mode,
             ON  Result codes in answer mode disabled
  8          OFF Command recognition disabled
             ON  AT command set recognition
  9          OFF Modem hangs up on +++
             ON  Modem does not hang up on +++
  10         OFF ATZ loads from NV RAM
             ON  ATZ loads factory defaults

Additional query words: 3.20

Keywords: KB129236


Send feedback to Microsoft

© Microsoft Corporation. All rights reserved.