Software Vault: The Gold Collection

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Text File | 1993-04-19 | 30KB | 755 lines

SPORTSTER 14,400 APPENDIX B. SUMMARIES AND TABLES FRONT PANEL INDICATORS Table B.1_LED Indicators SymbolMeaning Status AA Auto Answer/ Answer mode only: ON if DIP switch 5 is UP (OFF) when Answer the modem is powered on, or register S0 is set to 1 (Auto Answer mode), and when answering a call; OFF when the modem originates a call. CDCarrier DetectON if DIP switch 6 is UP (factory setting) and the modem receives a valid data signal (carrier) from a remote modem, indicating that data transmission is possible. Always ON if the CD override is ON (DIP switch 6 DOWN). OH Off Hook ON when the modem takes control of the phone line to establish a data link. RDReceived Data Flashes when the modem sends result codes or passes received data bits to the computer or terminal. SD Send Data Flashes when the computer or terminal sends a data bit to the modem. TRData Terminal ON if DIP switch 1 is UP (factory setting) and the modem Ready receives a DTR signal from the computer or terminal. Al ways ON if the DTR override is on, DIP switch 1 DOWN. RS Request to ON if your computer or terminal sends the RTS signal Send (your computer or terminal and software must support RTS). OFF if the modem is set to &R2 (Received Data hardware flow control) and the computer or terminal lowers RTS. CSClear to Send ON until the modem lowers CTS when Transmit Data hardware flow control is enabled (&H1, &H3). ARQ/Error Control/ Data Mode: Automatic Repeat Request. ON when the FAX Fax Operations modem is set to &M4 or &M5 and successfully connects with another modem under error control. Flashes randomly when the modem retransmits data to the remote modem. Fax Mode: Flashes steadily to indicate fax mode. THE RS-232 INTERFACE Description The RS-232 interface is a standard developed by the Electronic Industries Association (EIA). It defines the signals and voltages used when data is exchanged between a computer or terminal and a modem or serial printer. The entire standard covers many more functions than are used in most data communications applications. Data is transmitted between the devices over an RS-232 cable with a 25-pin male (DB-25P) connector to the modem and a 25-pin, 9- pin, 8-pin or custom-built connector to the computer or terminal. Pin Assignments Pin assignments are factory-set in the Sportster 14,400 to match the standard DB-25 assignments in the following table. DB-9 connectors for IBM PC/AT- compatible computers should be wired at the computer end of the cable as shown in the DB-9 column. If you're using an Apple computer, ask your dealer for the correct modem cable for your Apple model. Table B.2_RS-232 Interface Pin Definitions Signal Source DB-25 DB-9 Circuit Function Terminal*_ Modem 1 _ AA Chassis Ground Both 2 3 BA Transmitted DataTerminal 3 2 BB Received Data Modem 4 7 CA Request to SendTerminal 5 8 CB Clear to Send Modem 6 6 CC Data Set Ready Modem 7 5 AB Signal Ground Both 8 1 CF Carrier Detect Modem 12 _ SCF Speed Indicate Modem 20 4 CD Data Terminal Ready Terminal 22 9 CE Ring Indicate Modem * Indicates terminal or computer. Minimum Requirements Some computer/terminal equipment supports only a few of the RS-232 signal functions set in the Sportster 14,400. The minimum required for the modem to operate is as follows. Table B.3_Minimum Required Pins DB-25 DB-9 Pin Pin Function 2 3 Transmitted Data 3 2 Received Data 7 5 Signal Ground 20 4 Data Terminal Ready* * Required only if you have the Data Terminal Ready Override switch OFF (DIP switch 1 UP). Additional Flow Control Functions If your computer and software support Clear to Send and you wish to use Transmit Data hardware flow control (&H1), Pin 5 (DB-25) or Pin 8 (DB-9) is required. If your computer and software support Request to Send and you wish to use Received Data hardware flow control (&R2), Pin 4 (DB-25) or Pin 7 (DB-9) is required. For 57.6K and 38.4K bps Serial Port Rate Your software and terminal or computer must support the 57.6K or 38.4K bps rate. Make sure the RS-232 cable is shielded. Cables are normally six feet long, but longer lengths are possible. If you encounter problems with signal degradation, try a shorter cable. If you decide to build your own cable, use a low-capacitance cable. To further minimize the capacitance, connect only those functions (pins) that your application requires. DIP SWITCH SUMMARY Purpose The DIP switches, located at the rear of the modem, are for adapting the modem to your equipment and personal require ments. The quick configuration guide that came with the modem indicates the recommended switch settings for many communications software packages. If your software isn't included, you may need to review your software documentation to set DIP switches 1 and 6 correctly for your program's requirements. Some users are able to move a single switch with a finger tip. If this doesn't work for you, use a toothpick or other small instrument. Operations The DIP switch settings are power-on and reset defaults, read by the Sportster 14,400 when the computer is turned on or when you reset the modem. If changed when the modem is on, switches 2-5 require the ATZ (software reset) command to initiate the new settings. The remaining (hardware) switches are automatically operative when set UP or DOWN. Table B.4_DIP Switches Factory SwitchSetting Function 1 UP Data Terminal Ready (DTR) Operations UP Normal DTR operations: computer or terminal must provide DTR signal for modem to accept commands; dropping DTR terminates a call DOWN Modem ignores DTR (Override) 2 UP Verbal/Numeric Result Codes UP Verbal (word) results DOWN Numeric results 3 DOWN Result Code Display UP Results suppressed DOWN Results enabled 4 UP Command Mode Local Echo UP Keyboard commands displayed DOWN Echo suppressed 5 DOWN Auto Answer UP Modem answers on first ring DOWN Auto answer disabled 6 UP Carrier Detect (CD) Operations UP Modem sends CD signal when it connects with another modem, drops CD on disconnect DOWN CD always ON (Override) 7 UP Power-on and ATZ Reset Software Defaults UP Load from user-defined nonvolatile memory (NVRAM) DOWN Load factory settings from read only memory (ROM) 8 DOWN AT Command Set Recognition UP Command recognition disabled (Dumb Mode) DOWN Recognition enabled (Smart mode) DEFAULT SETTINGS User-Programmable Defaults You can create your own default configuration and store it in nonvolatile random access memory (NVRAM) using the &W command described in Chapter 5. As long as DIP switch 7 is UP when you power on or reset the modem, your defaults are loaded into the modem's random access memory (RAM). To view your NVRAM settings, use the ATI5 command. Tables on the next two pages list the options you can store in NVRAM, including S-Register settings. If DIP switch 7 is DOWN at power-on, the factory settings listed in the tables are loaded instead. The first time the modem is turned on, the NVRAM settings are the same as the factory settings. The following command example substitutes several user-defined defaults for factory settings. The modem also stores the rate, word length and parity it detects from the command's AT prefix, which depend on how you first set those parameters in your software. AT X4 &B1 &M5 &H1 M3 &W <Enter> Table B.5_NVRAM Command Options NVRAM Options Factory Setting Handshake option B0 CCITT answer sequence Normal/error control (ARQ) mode &M4 Normal/ARQ Data compression &K1 Auto enable/disable Transmit data flow control &H0 Disabled Rec'd data hardware flow control &R1 Ignore RTS Rec'd data software flow control &I0 Disabled Serial port rate select&B0 Detect from AT command; then follow connection rate Connection rate select&N0 Variable Result code subset X1 Extended Error-control response codes &A1 Enabled Tone/Pulse dialing P Pulse dial Online local echo F1 Disabled Speaker control M1 ON during dial through connect Remote Digital Loopback (RDL) &T5 Deny RDL Data Set Ready override&S0 Enabled Break handling &Y1 Clear buffer, send immediately Stored telephone number&Zs Blank Pulse dial make/break ratio &P0 U.S./Canada Guard tone &G0 U.S./Canada Word length* 7 Parity* Even Serial port rate* 19.2K bps * Detected by the modem from the AT prefix of the &W command that writes your defaults to NVRAM. Set your software to the desired word length, parity, and serial port rate defaults before sending the modem the AT . . . &W string. Table B.6_NVRAM S-Register Options Factory NVRAM S-Register Options Setting S2 Escape code character 43 S3 Carriage Return character 13 S4 Line Feed character 10 S5 Backspace character 8 S6 Dial wait-time, sec. 2 S7 Carrier wait-time, sec. 60 S8 Dial pause, sec. 2 S9 Carrier Detect time, 1/10th sec. 6 S10Carrier loss wait-time, 1/10th sec. 7 S11Touch-Tone duration, spacing, msec. 70 S12Escape code guard time, 1/50th sec. 50 S13Bit-mapped functions 0 S14Bit-mapped functions 0 S15Bit-mapped functions 0 S19Inactivity/hang up timer 0 S21Break length, 1/100th msec.10 S22XON character 17 S23XOFF character 19 S25DTR recognition time, 1/100th sec. 5 S27Bit-mapped functions 0 S28V.21/V.23 fallback delay, 1/10th msec. 8 S34Bit-mapped functions 6 S38Disconnect wait time, sec. 0 NOTE: Bit-mapped registers have up to eight functions. See instruc tions under S13 in the S-Register Summary in this appendix or the briefer summary in the Quick Reference Card. S-REGISTER SUMMARY Usage Users typically require the default values. To change a setting, use the ATSr=n command, where r is the register and n is a decimal value from 0O255 (unless otherwise indicated). The example below sets the modem's test timer to 10 seconds. ATS18=10 <Enter> The modem does not perform a value-range check. Some values you select may not work with some equipment, and you'll have to readjust the settings. Use ATSr? to display the contents of a register, as follows. ATS20? <Enter> Table B.7_S-Registers Register Default Function S0 See DIP Sets the number of rings on which to an- Switch 5 swer in Auto Answer Mode. When DIP switch 5 is UP the modem answers on the first ring; S0=1 does the same. When DIP switch 5 is DOWN (factory setting), Auto Answer is disabled; S0=0 (modem answers on 0 rings, or never) does the same. S1 0 Counts and stores the number of rings from an incoming call. S2 43 Stores the ASCII decimal code for the escape code character. Default character is I+U. A value of 128O255 disables the escape code. S3 13 Stores the ASCII code for the Carriage Return character. Valid range is 0O127. S4 10 Stores the ASCII decimal code for the Line Feed character. Valid range is 0O127. Register Default Function S5 8 Stores the ASCII decimal code for the Backspace character. A value of 128O255 disables the Backspace key's delete function. S6 2 Sets the number of seconds the modem waits before dialing. If set to X2 or X4, the modem ignores this register and dials as soon as it detects a dial tone (fast dials). S7 60 Sets the number of seconds the modem waits for a carrier. May be set for much longer duration if, for example, the modem is originating an international connection. S8 2 Sets the duration, in seconds, for the pause (,) option in the Dial command. S9 6 Sets the required duration, in tenths of a second, of the remote modem's carrier signal before recognition by the Sportster. S10 7 Sets the duration, in tenths of a second, that the modem waits after loss of carrier before hanging up. This guard time allows the modem to distinguish between a line hit, or other disturbances that momentarily break the connection, from a true disconnect (hang up) by the remote modem. While we don't recommend connecting the modem to a line with call waiting, if you have it, you may wish to adjust this setting up ward to prevent the modem from misinterpreting the second call signal as a disconnect by the remote modem. A better al ternative is to ask your phone company how to temporarily disable call waiting. NOTE: If you set S10=255, the modem will not hang up when carrier is lost. Dropping DTR will force the modem to hang up. Register Default Function S11 70 Sets the duration and spacing, in milliseconds, of dialed Touch-Tones. S12 50 Sets the duration, in fiftieths of a second, of the guard time for the escape code sequence (+++). S13 0 Bit-mapped register. Select the bit(s) you want on and set S13 to the total of the values in the Value column. For example, ATS13=17 enables bit 0 (value is 1) and bit 4 (value is 16). BitValue Result 0 1 Reset when DTR drops 1 2 Reserved 2 4 Reserved 3 8 On DTR signal, Auto Dial the number stored in NVRAM 4 16 At power on/reset, Auto Dial number stored in NVRAM 5 32 Reserved 6 64 Disable MNP Level 3 (used for testing Level 2) 7 128 Reserved S14 0 Bit-mapped. Allowable non- default value is 1. BitValueResult 0 1 The modem hangs up on receipt of +++, returns to command mode and sends the NO CARRIER result code; see Escape Code Operations in Chapter 6 1O7 _ Reserved Register Default Function S15 0 Bit-mapped register. To set the register, see the instructions for S13. BitValueResult 0O2 _ Reserved 3 8 Reset non-ARQ mode Transmit buffer from 1.5K bytes to 128* 4 16 Disable MNP Level 4; retransmitting the larger Level 4 data blocks may be a problem if you expect a great number of errors during a call 5O7 _ Reserved *The 1.5K-byte non-ARQ buffer allows data transfer with X- and Ymodem-type file transfer protocols without using flow control. The 128-byte option allows remote users with slower modems to stop data you're transmitting from scrolling off their screens. When remote users send your computer an XOFF (Ctrl-S) and you stop transmitting, the data in transit from your modem's buffer doesn't exceed the size of their screen. S16 0 Bit-mapped test register. Allowable value is 2. For information on the Dial test (used in factory testing), see Appendix F. BitValueResult 0 _ Reserved 1 2 Dial test 2O7 _ Reserved S17 0 Reserved. S18 0 Test timer for &Tn loopback testing. Sets the duration of testing, in seconds, before the modem automatically times out and terminates the test. When S18 is set to 0, the timer is disabled. See Appendix F for test instructions. Register Default Function S19 0 Sets the duration, in minutes, for the Inac tivity Timer. The timer activates when there is no data activity on the phone line; at timeout the modem hangs up. S19=0 disables the timer. S20 0 Reserved. S21 10 Sets the length, in 10- millisecond units, of Breaks sent from the modem to the computer or terminal; applies to ARQ mode only. S22 17 Stores the ASCII decimal code for the XON character. Valid range is 0O127. S23 19 Stores the ASCII decimal code for the XOFF character. Valid range is 0O127. S24 0 Reserved. S25 5 Sets the duration, in hundredths of a second, that DTR must be dropped so that the modem doesn't interpret a random glitch as a DTR loss. (Most users will want to use the default; this register is useful for setting compatibility with older systems running under older operating software.) S26 0 Reserved. S27 0 Bit-mapped register. To set the register, see the instructions for S13. BitValue Result 0 1 Enable CCITT V.21 modulation at 300 bps for overseas calls; in V.21 mode, the modem answers both over seas and domestic (U.S. and Canada) calls, but only originates V.21 calls S27 continued on following page Register Default Function S27 (cont.) Bit Value Result 1 2 Enable unencoded (non-trellis- coded) modulation in V.32 mode; rarely used part of CCITT Recommendation V.32 2 4 Disable V.32 modulation 3 8 Disable 2100 Hz answer tone to allow two V.42 modems to connect more quickly 4 16 See below 5 32 See below 6 64 Reserved 7 128 Unusual software incompatibility. Some software may not accept 7200, 12,000 and 14,400 bps result codes. This setting disables the codes and displays the 9600 code instead. Error control handshaking options: select the total values of bits 4 and 5. Bit 4 Bit 5 Result 0 0 Complete handshaking sequence: V.42 Detection, LAPM error control, MNP. 16 0 Disable MNP. 0 32 Disable V.42 Detection and LAPM. 16 32 Combined value of 48 negotiates LAPM without Detection phase. Choose this value if the remote modem uses LAPM but does not support the Detection phase. Register Default Function S28 8 Sets the duration, in tenths of a second, of the EIA-specified Multimode Training. Default = 8 (.8 seconds). This gives V.32 bis modems additional time to connect with most U.S./Canada modems at 9600 bps or higher before falling back to attempt a V.23 connection (some U.K. modems, 1200 bps) or a V.21 connection (European modems, 300 bps). If calling/answering low- speed, overseas modems under V.21 or V.23 modulation, setting S28 to zero eliminates the delay, giving a faster connect time. S29 20 Reserved for USRobotics' internal use. S30 0 Reserved. S31 0 Reserved. S32 1 Reserved. S33 0 Reserved. S34 6 Bit mapped. Allowable values are S34=6, S34=7, S34=14, and S34=15. BitValueResult 0 1 Disable V.32 bis. Used for troubleshooting; USRobotics' Technical Support may require that you disable V.32 bis for testing purposes. 1O2 _ Reserved 3 8 Enable V.23 modulation 4O7 _ Reserved S35 0 Reserved. S36 0 Reserved. S37 0 Reserved. Register Default Function S38 0 Sets an optional delay, in seconds, before a forced hang-up and clearing of the Transmit buffer when DTR drops during an ARQ call. This allows time for a remote modem to acknowledge receipt of all transmitted data before it is disconnected. Default = 0: the modem immediately hangs up when DTR drops. This option only applies to connections terminated by dropping DTR. If the modem receives the ATH command, it ignores S38 and immediately hangs up. ASCII CHART The following chart may be useful for programming.