Carrier Serial Number Lookup
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This article needs additional citations for. Unsourced material may be challenged and removed. ( November 2009) The Hayes command set is a specific originally developed by for the Smartmodem 300 in 1981. The command set consists of a series of short text strings which can be combined to produce commands for operations such as dialing, hanging up, and changing the parameters of the connection. The vast majority of dial-up modems use the Hayes command set in numerous variations. The command set covered only those operations supported by the earliest 300 bit/s modems. When new commands were required to control additional functionality in higher speed modems, a variety of one-off standards emerged from each of the major vendors.
These continued to share the basic command structure and syntax, but added any number of new commands using some sort of prefix character – & for Hayes and, and for, for instance. Many of these re-standardized on the Hayes extensions after the introduction of the and the subsequent market consolidation that followed. Contents. History Background Prior to the introduction of the (BBS), modems typically operated on direct-dial that always began and ended with a known modem at each end.
The modems operated in either 'originate' or 'answer' modes, manually switching between two sets of frequencies for data transfer. Generally, the user placing the call would switch their modem to 'originate' and then dial the number by hand. When the remote modem answered, already set to 'answer' mode, the telephone handset was switched off and communications continued until the caller manually disconnected.
When automation was required, it was commonly only needed on the answer side — for instance, a bank might need to take calls from a number of branch offices for end-of-day processing. To fill this role, some modems included the ability to pick up the phone automatically when it was in answer mode, and clearing the line when the other user manually disconnected.
The need for automated outbound dialling was considerably less common, and handled through a separate peripheral device, a 'dialler'. This was normally plugged into a separate port on the computer (typically an port) and programmed separately from the modem itself. This method of operation worked satisfactorily in the 1960s and early 1970s, when modems were generally used to connect dumb devices like (dialling out) with smart (answering). However, the of the 1970s led to the introduction of low-cost modems and the idea of a semi-dedicated point-to-point link was no longer appropriate. There were potentially thousands of users who might want to dial any of the other thousands of users, and the only solution at the time was to make the user dial manually.
The needed a way to tell the modem what number to dial through software. The earlier separate dialers had this capability, but only at the cost of a separate port, which a microcomputer might not have available. Another solution would have been to use a separate set of 'command pins' dedicated to sending and receiving commands, another could have used a signal pin indicating that the modem should interpret incoming data as a command. Both of these had hardware support in the RS-232 standard. However, many implementations of the RS-232 port on microcomputers were extremely basic, and some eliminated many of these pins as a cost saving measure. Hayes' solution Hayes Communications introduced a solution in its 1981 Smartmodem by re-using the existing data pins with no modification. Instead, the modem itself could switch itself between one of two modes:.
in which the modem sends the data to the remote modem. (A modem in data mode treats everything it receives from the computer as data and sends it across the phone line). in which data is interpreted as commands to the modem (commands that the local modem should execute). To switch from data mode to command mode, sessions sent an string of three plus signs (') followed by a pause of about a second. The pause at the end of the escape sequence was required to reduce the problem caused by: if any other data was received within one second of the three plus signs, it was not the escape sequence and would be sent as data. To switch back they sent the online command, O. In actual use many of the commands automatically switched to the online mode after completion, and it is rare for a user to use the online command explicitly.
In order to avoid licensing Hayes's patent, some manufacturers implemented the escape sequence without the time guard interval ( (TIES)). This had a major security implication in that it would lead to the modem hanging up the connection should the computer ever try to transmit the byte sequence 'ATH0' in data mode.
For any computer connected to the Internet through such a modem, this could be easily exploited by sending it a request containing the sequence 'ATH0' in the payload. The computer operating system would automatically try to reply the sender with the same payload, immediately disconnecting itself from the Internet, as the modem would interpret the packet's data payload as a Hayes command. The same error would also trigger if, for example, the user of the computer ever tried to send an e-mail containing the aforementioned string.
Commands The Hayes command set includes commands for various phone-line manipulations, dialing and hanging-up for instance. It also includes various controls to set up the modem, including a set of register commands which allowed the user to directly set the various memory locations in the original Hayes modem. The command set was copied largely verbatim, including the meaning of the registers, by almost all early 300 baud modem manufacturers, of which there were quite a few. The expansion to 1200 and 2400 baud required the addition of a small set of new commands, some of them prefixed with an ampersand ('&') to denote those dedicated to new functionality.
Hayes itself was forced to quickly introduce a 2400 baud model shortly after their 1200, and the command sets were identical as a time-saving method. Essentially by accident, this allowed users of existing 1200 baud modems to use the new Hayes 2400 models without changing their software.
This re-inforced the use of the Hayes versions of these commands. Years later, the (TIA)/ (EIA) raised the 2400-baud command set into a formal standard with the title Data Transmission Systems and Equipment - Serial Asynchronous Automatic Dialing and Control, TIA/EIA-602. However, Hayes Communications moved only slowly to higher speeds or the use of compression, and three other companies led the way here —,. Each of these three used its own additional command-sets instead of waiting for Hayes to lead the way.
By the early-1990s, there were four major command sets in use, and a number of versions based on one of these. Things became simpler again during the widespread introduction of 14.4 and 28.8 kbit/s modems in the early 1990s. Slowly, a set of commands based heavily on the original Hayes extended set using '&' commands became popular, and then universal. Only one other command set has remained popular, the US Robotics set from their popular line of modems. Description The following text lists part of the Hayes command set (also called the AT commands: 'AT' meaning 'attention').
The Hayes command set can subdivide into four groups:. basic command set – A capital character followed by a digit.
For example, M1. extended command set – An '&' (ampersand) and a capital character followed by a digit. This extends the basic command set. For example, &M1. Note that M1 is different from &M1.
proprietary command set – Usually starting either with a backslash (“ ”) or with a percent sign (“%”); these commands vary widely among modem manufacturers. register commands – Sr=n where r is the number of the register to be changed, and n is the new value that is assigned. A represents a specific physical location in memory. Modems have small amounts of memory on board. The fourth set of commands serves for entering values into a particular register (memory location). The register will store a particular value (alpha-numeric information) which the modem and the communications software can utilize. For example, S7=60 instructs the modem to 'Set register #7 to the value 60'.
Although the command-set syntax defines most commands by a letter-number combination (L0, L1 etc.), the use of a zero is optional. In this example, 'L0' equates to a plain 'L'. Keep this in mind when reading the table below. When in data mode, an can return the modem to command mode.
The normal escape sequence is three plus signs ('), and to disambiguate it from possible real data, a guard timer is used: it must be preceded by a pause, not have any pauses between the plus signs, and be followed by a pause; by default, a 'pause' is one second and 'no pause' is anything less. Syntactical definitions The following syntactical definitions apply:. Carriage return character, is the command line and result code terminator character, which value, in decimal ASCII between 0 and 255, is specified in register S3.
The default value is 13. Linefeed character, is the character recognised as line feed character. Its value, in decimal ASCII between 0 and 255, is specified in register S4.
The default value is 10. The line feed character is output after the carriage return character if verbose result codes are used (V1 option is used); otherwise, if numeric format result codes are used (V0 option is used), it will not appear in the result codes. Name enclosed in angle brackets is a syntactical element. They do not appear in the command line. Optional subparameter of a command or an optional part of AT information response is enclosed in square brackets. Brackets themselves do not appear in the command line.
When the subparameter is not given in AT commands which have a Read command, the new value equals its previous value. In AT commands which do not store the values of any of their subparameters, and so have not a Read command, which are called action type commands, the action should be done on the basis of the recommended default setting of the subparameter. Modem initialization. For other uses, see. A string can contain many Hayes commands placed together, so as to optimally prepare the modem to dial out or answer, e.g.
AT&F &D2&C1S0=0X4. This is called the initialization string. The V.250 specification requires all to accept a body (after 'AT') of at least 40 characters of commands. Example session The following represents two computers, computer A and computer B, both with modems attached, and the user controlling the modems with software.
Terminal-emulator software typically allows the user to send Hayes commands directly to the modem, and to see the responses. In this example, the user of computer A makes the modem dial the phone number of modem B at phone number 555-1234 (long distance). After every command and response, there is a sent to complete the command. Modem A Modem B Comment ATDT15551234 User at modem A issues a dial command: AT-Get the modem's ATtention; D-Dial; T-Touch-Tone; 15551234-Call this number RING Modem A begins dialing.
Modem B's phone-line rings, and the modem reports the fact. ATA Computer at modem B issues answer command. CONNECT CONNECT The modems connect, and both modems report 'connect'. (In practice, most modems report more information after the word CONNECT — specifying the speed of the connection.) Also, at this time, both modems will raise the DCD, or Data Carrier Detect signal, on the serial port.
Abcdef abcdef When the modems are connected, any characters typed at either side will appear on the other side. The person at computer A starts typing. The characters pass through the modem and appear on computer B's screen. (User A may not see his own typed characters — depending on the terminal software's setting). The person at computer B issues the modem escape command. (Alternately, and more commonly, the computer B could drop the DTR, or Data Terminal Ready signal, to achieve a hangup, without needing to use or ATH.) OK The modem acknowledges it. ATH The person at computer B issues a hang up command.
NO CARRIER OK Both modems report that the connection has ended. Modem B responds 'OK' as the expected result of the command; modem A says to report that the remote side interrupted the connection. The modems on both sides drop their DCD signals as well. Compatibility While the original Hayes command set represented a huge leap forward in modem-based communications, with time many problems set in, almost none of them due to Hayes per se:. Due to the lack of a written standard, other modem manufacturers just copied the external visible commands and (roughly) the basic actions.
This led to a wide variety of subtle differences in how modems changed from state to state, and how they handled error conditions, hangups, and timeouts. Each manufacturer tended to add new commands to handle emerging needs, often incompatible with other modems. For example, setting up hardware or software handshaking often required many different commands for different modems. This undermined the handy universality of the basic Hayes command set.
Many Hayes compatible modems had serious quirks that made them effectively incompatible. For example, many modems required a pause of several seconds after receiving the 'AT Z' reset command. Some modems required spaces between commands, while others did not. Some would unhelpfully change baud-rate of their own volition, which would leave the computer with no clue how to handle the incoming data.
As a result of all this, eventually many communications programs had to give up any sense of being able to talk to all 'Hayes-compatible' modems, and instead the programs had to try to determine the modem type from its responses, or provide the user with some option whereby they could enter whatever special commands it took to coerce their particular modem into acting properly. Autobaud The Hayes command set facilitated as 'A' and 'T' happen to have bit patterns that are very regular; 'A' is '100 0001' and so has a 1 bit at the start and end and 'T' is '101 0100' which has a pattern with (nearly) every other bit set. Since the RS-232 interface transmits first, the according line pattern with (eight data bits, no parity bit, one stop bit) is 1100101010 1 (start and stop bits italicized) which is used as.
The basic Hayes command set The following commands are understood by virtually all modems supporting an AT command set, whether old or new. Command Description Comments A0 or A Answer incoming call A/ Repeat last command Do not preface with AT, do not follow with carriage return. Enter usually aborts. D Dial Dial the following number and then handshake P - Pulse Dial T - Touch Tone Dial W - Wait for the second dial tone R - Reverse to answer-mode after dialing @ - Wait for up to 30 seconds for one or more ringbacks, - Pause for the time specified in register S8 (usually 2 seconds); - Remain in command mode after dialing.! - Flash switch-hook (Hang up for a half second, as in transferring a call.) L - Dial last number E0 or E No Echo Will not echo commands to the computer E1 Echo Will echo commands to the computer (so one can see what one types) H0 or H Hook Status On hook.
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Hangs up the phone, ending any call in progress. H1 Hook status Off hook.
Picks up the phone line (typically you'll hear a dialtone) I0 to I9 Inquiry, Information, or Interrogation This command returns information about the model, such as its firmware or brand name. Each number (0 to 9, and sometimes 10 and above) returns one line of modem-specific information, or the word ERROR if the line is not defined. Today, Windows uses this for detection of specific modem types. L0 or Ln (n=1 to 3) Speaker Loudness. Supported only by some modems, usually external ones.
Modems lacking speakers, or with physical volume controls, or ones whose sound output is piped through the sound card will not support this command. Off or low volume M0 or M Speaker off, completely silent during dialing M3 is also common, but different on many brands M1 Speaker on until remote carrier detected (i.e. Until the other modem is heard) M2 Speaker always on (data sounds are heard after CONNECT) O Return Online Returns the modem back to the normal connected state after being interrupted by the ' escape code. Q0 or Q Quiet Mode Off - Displays result codes, user sees command responses (e.g.
OK) Q1 Quiet Mode On - Result codes are suppressed, user does not see responses. S n Select current register Note that S n,? And = r are actually three separate commands, and can be given in separate AT commands. Select register n as the current register S n? Select register n as the current register, and query its value.
On its own will query whichever register was most recently selected. S n= r Select register n as the current register, and store r in it. Using = r on its own will store into whichever register was most recently selected. V0 or V Verbose Numeric result codes V1 English result codes (e.g. CONNECT, BUSY, etc.) X0 or X Smartmodem Hayes Smartmodem 300 compatible result codes X1 Usually adds connection speed to basic result codes (e.g. CONNECT 1200) X2 Usually adds dial tone detection (preventing blind dial, and sometimes preventing ATO) X3 Usually adds busy signal detection. X4 Usually adds both busy signal and dial tone detection Z0 or Z Reset Reset modem to stored configuration.
Use Z0, Z1etc. For multiple profiles. This is the same as &F for factory default on modems without NVRAM (non volatile memory) Note: a command string is terminated with a CR ( r) character Although not part of the command set, a character is commonly used in modem command sequences. The causes many applications to pause sending the command stream to the device (usually for half a second), e.g.
After a Reset. The is not sent to the modem. Georgi Dalakov. Retrieved January 8, 2015. Max, Schau (27 September 1998). Mailing list.
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Retrieved 8 December 2012. Frank Durda IV, 1993. '5.2.1 Command line general format', (PDF), /Telecommunication Standardization Bureau. Retrieved 2016-05-15. Chebucto Community Net. Retrieved 2016-09-12.
Archived from on 2011-09-29. 090505 developer.sonyericsson.com. (PDF). Archived from (PDF) on 2011-07-14. 090505 m2m-platforms.com.
External links The Wikibook has a page on the topic of:., AT command set for. (dead). from (dead).
Hopefully this works Answer: The following will explain a Carrier serial number sequence. NNNNANNNNN This serial number format was used in the 1970's through current. The first 4 numeric characters are the week and year of production. For example, a unit that came off the line on March 25, 1999 would begin with 1399, week 13 of the year 1999.
ANNNNNN This serial number was used from 1969 to 1990. The first alpha character is for the month of production. A-M = Jan-Dec 1969-1979 N-Z = Jan-Dec 1980-1990 'I' and 'O' are not used The second digit, a numeric character is the production year The balance of the numeric characters are the production sequence e.g., A912345.this serial number would be a unit produced in Jan 1969 P512345.this unit would have been produced in Feb 1985. Hopefully this works Answer: The following will explain a Carrier serial number sequence.
NNNNANNNNN This serial number format was used in the 1970's through current. The first 4 numeric characters are the week and year of production. For example, a unit that came off the line on March 25, 1999 would begin with 1399, week 13 of the year 1999.
ANNNNNN This serial number was used from 1969 to 1990. The first alpha character is for the month of production.
A-M = Jan-Dec 1969-1979 N-Z = Jan-Dec 1980-1990 'I' and 'O' are not used The second digit, a numeric character is the production year The balance of the numeric characters are the production sequence e.g., A912345.this serial number would be a unit produced in Jan 1969 P512345.this unit would have been produced in Feb 1985 Thanks Ron. This is just what I was looking for. According to the aging convention you provided the systems in question are: Furnace built in February 1981 and A/C unit built in October, 1980 Thanks for the help!