Software Vault: The Gold Collection

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Text File | 1993-04-19 | 20KB | 542 lines

SPORTSTER 14,400 CHAPTER 5. INTERNAL CONTROLS The commands explained in this chapter are of two types. The first group concerns default configurations, for example, writing your own power-on defaults to nonvolatile random access memory (NVRAM). The remaining commands are used to select the modem's local operating characteristics, for a current session or to include in your default configuration. They include result codes, echoing, and other options. NOTE: When you change a default setting during a session, the modem retains that setting until you do one of the following. ∙ Change the setting again. ∙ Issue the ATZ command to reset the modem to its software defaults. If DIP switch 7 is UP, the modem resets to the defaults stored in nonvolatile memory (NVRAM). If DIP switch 7 is DOWN, the modem resets to the factory settings stored in read only memory (ROM). ∙ Issue the AT&F command to load the modem's factory settings. ∙ Turn the computer off and power it on again. At power-on, the modem loads either the nonvolatile memory defaults (DIP switch 7 UP) or the factory settings (DIP switch 7 DOWN). SETTING/USING DEFAULTS The modem's read only memory (ROM) permanently stores the modem's factory settings. The inclusion of nonvolatile random access memory (NVRAM) allows you to define your own configuration and write the settings to NVRAM as your power-on defaults. Writing Defaults to NVRAM (&W) When you power on the Sportster 14,400, it loads the settings stored in NVRAM if DIP switch 7 is UP (factory setting). Until you write your own settings to NVRAM, the defaults stored there are the same as the permanent ROM factory settings. You'll find a list of NVRAM options and factory settings in Appendix B. You can also display them by selecting option 5 of the I (inquiry) command. ATI5 <Enter> If you've sent the modem commands to change settings through-out your session and want to save your current configuration, send just the &W command. The current settings are written to NVRAM. AT&W <Enter> You may also specify the entire configuration in a single command string that ends with the &W command. The following example sets the modem for the current session and stores the configuration in NVRAM. AT X4 &B1 &H1 M3 &W <Enter> After sending a configuration to NVRAM, you can change any setting just for the current session, as in the following example. The NVRAM configuration remains intact. ATX3 <Enter> But if you want the new setting to be a default, write it to NVRAM at the same time, as in the following example. X3 is substituted for the X4 setting stored earlier. AT X3 &W <Enter> Loading the Factory Defaults (&F) If DIP switch 7 is DOWN, the permanent read-only factory settings are loaded at power-on instead of the NVRAM defaults. Factory settings for the options that are stored in NVRAM are in Appendix B. If the NVRAM defaults are loaded at power-on (DIP switch 7 UP) and you want to load the factory defaults instead, use the following command. AT&F <Enter> If NVRAM defaults are loaded, but you want to view a screen listing of factory defaults, first load them (&F), to make them the current settings. Then include the I4 inquiry option to display a listing of the new settings, as in the following example. AT&F I4 <Enter> To restore your NVRAM defaults, use the ATZ command described next. (DIP switch 7 must be UP.) Reset (Z) If you've changed several current settings and want to reset to your power- on defaults, type the following command. ATZ <Enter> The modem reads its DIP switch settings and resets either to its NVRAM defaults (DIP switch 7 UP) or factory settings (DIP switch 7 DOWN). NOTE: Use the ATZ command if you've changed the position of DIP switches 2O5 while the modem is on, so that the modem can read the new settings. The only other way to initiate a new set ting for switches 2O5 is to turn the modem off and on again. Storing a Phone Number (&Zs) You can store your most frequently dialed phone number in NVRAM. Use the &Zs command, where s is the phone-number string of the remote modem. The number string may be up to 36 characters long, including any Dial command options. The following example includes the tone-dial (T) and wait for a second dial tone (W) options of the Dial command. AT&ZT9W5551234 <Enter> The following example stores a long- distance number. We've added spaces for readability. AT&Z 1 516 555 1234 <Enter> The DS command is used to dial the stored number. ATDS <Enter> NOTE: Do not include modem settings in the &Z string. If the call requires a special setting, insert it in the command string before the DS command. In the following example, &M0 (no error control) is inserted before the Dial command. AT&M0 DS <Enter> This establishes &M0 as the current setting. To return to default error- control mode after the call, issue the following command. AT&M4 <Enter> RESULT CODES Four commands control the result codes that the modem returns to the screen. Vn Numeric/verbal response mode Qn Display/suppress all result codes Xn Result code options &An Display/suppress additional result code options Response Modes (Vn) Result codes are sent to the screen in either words (Verbal mode) or numbers (Numeric mode). The Sportster 14,400 is factory-set to Verbal mode when it is powered on (DIP switch 2 is UP). Use the Vn command to select verbal or numeric result codes for a current session, independently of the DIP switch setting. At power-on and reset, the modem operates according to the DIP switch setting. The Vn command is not stored in nonvolatile memory as a power- on/reset default. V0 Numeric mode. Numeric result codes are followed by a Carriage Return but no Line Feed, as in the following example, where a 3 is returned (for NO CARRIER). ATD1234567 <Enter> becomes 3TD1234567 <Enter> V1 Verbal mode. Verbal responses are preceded and followed by a Carriage Return and a Line Feed, as shown below. ATD1234567 <Enter> NO CARRIER Quiet Mode (Qn) Enable/suppress the display of result codes. The Sportster 14,400 is shipped with DIP switch 3 DOWN, to display result codes. Use the Qn command to control the display for a current session, independently of the switch setting. At power-on and reset, the modem operates according to the DIP switch setting. The Qn command is not stored in nonvolatile memory as a power- on/reset default. Q0 Result codes are displayed. Q1 Result codes are suppressed (made quiet). Q2 Result codes are suppressed only in Answer mode. Result Code Options (Xn) You have five options, X0 through X4, for selecting the result code set best suited to your applications, as shown in Table 5.1 on the next page. Definitions are listed in Table 5.2. X0 Basic set, returns the first five codes (0O4) in the following table. X1 Extended set, codes 0O5, 10, 13 and 18, that adds rate-specific CONNECT messages to the Basic set. Default. This set also includes all &A result codes. X2-4These options include the X1 set, call-progress codes 6 or 7, and 8, and the functions listed in the table. Table 5.1_Result Code Options Setting Result Codes X0 X1X2 X3 X4 0/OK · · · · · 1/CONNECT · · · · · 2/RING · · · · · 3/NO CARRIER · · · · · 4/ERROR · · · · · 5/CONNECT 1200 · · · · 6/NO DIAL TONE · · 7/BUSY · · 8/NO ANSWER · · 10/CONNECT 2400 · · · · 13/CONNECT 9600 · · · · 18/CONNECT 4800 · · · · 20/CONNECT 7200 · · · · 21/CONNECT 12000 · · · · 25/CONNECT 14400 · · · · Functions Adaptive Dialing · · · Wait for 2nd Dial Tone (W) · · Wait for Answer (@) · · Fast Dial · · NOTE: Additional CONNECT messages indicate an error-control connection, the modulation for a call, or the type of error control and data compression used. See Additional Result Code Options (&An), following this section. Table 5.2_Result Code Definitions Result Code Meaning 0/OK Command has been executed 1/CONNECT Connection established with another modem; if set to X0, connection may be at 300, 1200, 2400, 7200, 9600, 12K or 14.4K bps; if X1 or higher, connection is at 300 bps 2/RING Incoming ring detected 3/NO CARRIER Carrier detect has failed or carrier has been dropped due to disconnect 4/ERROR Command is invalid 5/CONNECT 1200 Connection established with another modem at 1200 bps 6/NO DIAL TONE Dial tone not detected during the normal 2 seconds, set in Register S6 7/BUSY Busy signal detect; modem hangs up 8/NO ANSWER After waiting 5 seconds for an answer, modem hangs up; returned instead of NO CARRIER when the @ option is used 10/CONNECT 2400 Connection established with another modem at 2400 bps 13/CONNECT 9600 Connection established at reported rate. Same meaning for results of 4800 (18), 7200 (20), 12K (21) and 14.4K (25) bps Adaptive Dialing The modem attempts to use Touch-Tone dialing and, if that doesn't work on the line, reverts to rotary dialing. Wait for Another The modem continues dialing as soon as it detects another Dial Tone (W)dial tone. See the dial options in Chapter 6. Wait for an The modem continues dialing when it detects 5 seconds of Answer (@) silence on the line. See the dial options in Chapter 6. Fast Dial The modem dials immediately on dial-tone detect, instead of waiting the normal 2 seconds set in Register S6. See S-Registers in Appendix B. Additional Result Code Options (&An) Use this command to enable/disable one of the following sets of error control, modulation or protocol result codes. &A0ARQ (error-control) codes are disabled. This setting does not affect an error-control connection; the modem returns standard CONNECT messages if result codes are enabled. If you select &A0 and then encounter software problems, it may be because your software expects to find the default &A1 result codes. For example, some communications software allows you to specify in the setup program the model of USRobotics modem you are using. The software then tries to use the default settings for that modem; a discrepancy from the defaults may cause problems. Review your software documentation, and set the modem to &A1 if necessary. &A1ARQ codes are enabled. Default. One of the results below is shown when a successful error-control connection is established. CONNECT/ARQ is displayed if the mo dem is set to X0 (see the next section) and the connection is between 1200 to 14.4K bps. The remaining results indicate connection rate and require X1 (default) or above. If your software cannot handle the ARQ codes, select &A0. 14/CONNECT/ARQ 19/CONNECT 4800/ARQ 15/CONNECT 1200/ARQ 24/CONNECT 7200/ARQ 16/CONNECT 2400/ARQ 22/CONNECT 12000/ARQ 17/CONNECT 9600/ARQ 26/CONNECT 14400/ARQ &A2V32 modulation codes are enabled. These results require a setting of X1 or higher. If your software cannot handle the added modulation information, select &A1 or &A0. 33/CONNECT 9600/V32 41/CONNECT 12000/V32 37/CONNECT 9600/ARQ/V3242/CONNECT 12000/ARQ/V32 38/CONNECT 4800/V32 44/CONNECT 7200/ARQ/V32 39/CONNECT 4800/ARQ/V3245/CONNECT 14400/V32 40/CONNECT 7200/V32 46/CONNECT 14400/ARQ/V32 &A3Protocol codes are enabled. Error- control protocols reported are LAPM or MNP. When the call is not under one of those protocols (and ARQ is not included in the result code), the modem reports NONE, for no protocol. If the modems are using data compression, the type of compression, V42BIS or MNP5, is added to the result code. In the first of the following examples, the modems negotiated error control for the call (ARQ), used V.32 bis modulation, are using the LAPM error-control protocol, and are using V.42 bis compression. CONNECT 14400/ARQ/V32/LAPM/V42BIS[or MNP/MNP5] CONNECT 9600/ARQ/V32/LAPM/V42BIS[or MNP/MNP5] CONNECT 4800/ARQ/V32/LAPM/V42BIS[or MNP/MNP5] CONNECT 2400/ARQ/MNP/MNP5[or LAPM/V4 2BIS] CONNECT 2400/NONE Although these codes will return numeric identifiers if DIP switch 2 is DOWN or you've set the modem to V0, they are the same numeric identifiers used for &A2 result codes. If you want &A3 protocol indicators, use Verbal mode (V1), and not Numeric mode (V0). If your software cannot handle the added protocol information, select &A2, &A1 or &A0. LOCAL ECHO Local echo is the display of what you type at the keyboard and data the Sportster 14,400 transmits to another modem. The En command controls the display of your typed commands, when the modem is in Command mode. The Fn command applies when the modem is online to another system. Command Mode Local Echo (En) The Sportster 14,400 is shipped with DIP switch 4 UP, enabling local echo. The En command controls the local echo for a current session, independently of the switch setting. At power-on and reset, the modem operates according to the DIP switch setting. The En command is not stored in nonvolatile memory as a power-on/reset default. E0 Command Mode echo OFF. The modem does not display keyboard commands. E1 Command Mode echo ON. NOTE: If double characters appear on the screen, both the modem's local echo and your software's local echo are on. Online Local Echo (Fn) This command causes the modem to display a copy of the data it is transmitting to another system. Many systems, however, return a copy of received data, which is called a remote echo. If the modem's online echo is ON and there is also remote echoing, double characters appear on the screen. In some microcomputer documentation, the term duplex is applied to local online echoing, although the term is not techni cally accurate. F0 Online echo ON. Sometimes called half duplex. As the modem transmits data to a remote system, it also sends a copy of the data to the screen. F1 Online echo OFF. Sometimes called full duplex. Default. THE AUDIO MONITOR The modem's speaker enables you to monitor the dial-connect process. There are several ways to make use of this feature. After the Sportster 14,400 dials a number, it waits up to 60 seconds for a high-pitched answer tone from the other modem, immediately followed by data signals, called a carrier. These signals must occur before a data link is established. At the default X1 setting, if someone answers the phone or if the line is busy, the modem sends you the NO CARRIER message after 60 seconds. If you listen to the speaker, you can respond immediately, instead of waiting for the modem to time out, by pressing any key on the keyboard. This cancels the call. You can also hear if dialing is proceeding too quickly for the system. Terminate the call (press any key) and retype the Dial command, but insert a comma (,) or a couple of slashes (/), to have the modem pause during the dialing process. Speaker Control (Mn) This command disables the speaker entirely or sets the speaker to monitor different segments of the dial-connect sequence. M0 This setting disables the speaker entirely so that you don't hear the modem go off hook, dial, etc. M1 The speaker is ON until Carrier Detect. Default. You can monitor call progress until the Sportster 14,400 detects the remote modem's carrier signals, or until the 60- second timeout and result code display. At Carrier Detect, the modem disconnects the speaker and data transmission sounds are suppressed. M2 The speaker is ON continuously, including during data transmission. M3 The speaker doesn't go ON until after the last digit is dialed, then goes OFF at Carrier Detect. S-REGISTERS The S-Registers are used to set various timing parameters, redefinition of selected ASCII characters, and other configuration options. The defaults reflect typical requirements. A detailed summary of the S-Register functions is in Appendix B. A less detailed summary is in the Quick- Reference card.