Assessments - 3, GPA: 3.7
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XON/XOFF StandardASCII controlcharactersused to tell an intelligent device to stop/resume transmitting data. Ymodem An error-checkingprotocolthat can send several files of data at a time in 1024-byte (1K) blocks. This protocol can use either checksums or CRC for error checking. Ymodem G Similar toYmodem, except it includes no error checking, which makes it faster. Zmodem Similar toXmodem andYmodem, except it includes batch transfer, the ability to recover from a partially complete transfer, an autostart feature, and improved efficiency. TECHNICAL QUICK REFERENCE This section includes information about: · AT Command Summary · S-Registers TECHNICAL QUICK REFERENCE AT Command Summary • Type commands in either upper or lower case, not a combination. Use the Backspace key to delete errors. (You cannot delete the original AT command since it is stored in the modem buffer.) • If a command has numeric options and you don’t include a number, zero is assumed. For example, if you type ATB, the command ATB0 is assumed. • Every command except A/, A>, and +++ must begin with the AT prefix and be entered by pressing ENTER. • The maximum command length is 58 characters. The modem doesn’t count the AT prefix, carriage returns, or spaces. NOTE: All defaults are based on the &F1.Hardware Flow Control template loaded in NVRAM when the modem is shipped. Defaults are listed in italics. TECHNICAL QUICK REFERENCE Command Set $ Use in conjunction with D, S, or & commands (or just AT) to display a basic command list; online help. A Manual Answer: goes off hook in answer mode. Pressing any key aborts the operations. A/ Re-executes the last issued command. Used mainly to redial. This does not require the AT prefix or a Carriage Return. A> Re-executes the last-issued command continually. Any key Aborts off-hook dial/answer operation and hangs up. AT Required command prefix, except with A/ and +++. Use alone to test for OK result code. Bn U.S./ITU-T answer sequence. B0 ITU-T answer B1 sequence U.S. answer tone Dn Dials the specified phone number. Includes the following: L P R Dials the last dialed number. Pulse (rotary) dial Originates call using answer (reverse) frequencies. TECHNICAL QUICK REFERENCE Sn Dials the phone ! (Exclamation point) number string stored in Flashes the switch NVRAM at position n hook. (n = 0-3). Phone / Delays for 125 ms. numbers are stored before proceeding with with the &Zn=s dial string. command. W Wait for second dial T Tone dial tone (X2 or X4); , (Comma) Pause, See linked to S6 register. S8 definition; which @ Dials, waits for quiet it’s linked to. answer, and continues ; (Semicolon) Return to (X3 or higher). Command mode after $ Displays a list of Dial dialing. commands. “ Dials the letters that En Sets local echo. follow (in an alphabetical phone number). E0 E1 Echo OFF Modem displays keyboard commands TECHNICAL QUICK REFERENCE Fn Sets online local echo of transmitted data ON/OFF. F0 Local echo ON. Modem sends a copy of data it sends to the remote system to your screen. F1 Local echo OFF. Receiving system may send a remote echo of data it receives. Hn Controls ON/OFF hook. H0 Hangs up (goes on hook). H1 Goes off hook. In Displays the following information. I0 Four-digit product code I1 Results of ROM checksum I2 Results of RAM checksum I3 Product type I4 Current modem settings I5 Nonvolatile memory (NVRAM) settings I6 Link diagnostics I7 Product configuration Ln Controls speaker volume (internals only). L0 Low volume L1 Low volume L2 Medium volume L3 High volume TECHNICAL QUICK REFERENCE Mn Operates speaker. M0 M1 M2 M3 Speaker always OFF. Speaker ON until CONNECT. Speaker always ON. Speaker ON after dial, until CONNECT. On Returns online. O0 O1 Returns online. Returns online and retrains. P Sets pulse dial (for phone lines that don’t support touch-tone dialing). Qn Displays/suppresses result codes. Q0 Displays result codes. Q1 Quiet mode; no result codes. Q2 Displays result codes only in Originate mode. Sr.b=n Sets bit .b of register r to n (0/OFF or 1/ON). Sr=n Sets register r to n. Sr? Displays contents of S- Register r. S$ Displays a list of the S- Registers. T Sets tone dial. Vn Displays verbal/numeric result codes. V0 Numeric codes V1 Verbal codes TECHNICAL QUICK REFERENCE Xn Sets result code displayed. Default is X4. Xn Setting Result Codes X0 X1 X2 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* 9/RESERVED 10/CONNECT 2400 11/RINGING 13/CONNECT 9600 18/CONNECT 4800 20/CONNECT 7200 21/CONNECT 12000 25/CONNECT 14400 43/CONNECT 16800 85/CONNECT 19200 91/CONNECT 21600 99/CONNECT 24000 103/CONNECT 26400 107/CONNECT 28800 151/CONNECT 31200 155/CONNECT 33600 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · TECHNICAL QUICK REFERENCE Xn (continued) Xn Result Codes (cont.) X0 X1 X2 X3 X4 Adaptive Dialing ··· Wait for 2nd D...
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