Introduction

1.4.1Sending Commands

All command lines sent to the modem, except for A/, must be preceded by an ‘AT’ and terminated by the contents of S-register S3 (typically a carriage return <CR>). AT stands for ‘attention’ and prompts the modem to receive a command line from the DTE. A <CR> informs the modem that the entire command string has been transmitted and to begin processing all the commands in the command line. A command line can include one or more AT commands. The commands can be separated by a space, if desired, but no punctuation is needed except for extended commands. Extended commands begin with a ‘+’, such as fax, voice, and V.250 commands. In a multiple- command line, extended AT commands must be separated from following commands by a semicolon(;).

Examples:

ATS1?<CR>

A/

AT &F &D2 +FCLASS=?<CR>

AT +FCLASS=0; S0=1<CR>

The modem provides status information to the DTE in the form of response codes, as listed in Table 4. Response codes take two (2) forms, text (ATV1) or numeric (ATV0), depending on how the modem is configured.

Table 4 lists basic format response codes. These response codes have numeric equivalents that are displayed depending on the value of ATV. In addition to the basic format response codes, there are extended syntax result codes that indicate connection status of the DCE-DCE connection that are not effected by numeric response reporting. These result codes have no numeric equivalent and are always issued in text form. The result codes display modem mode, transmit connection rate, error correction, compression, DTE rate, and receive rate. Note that the final connection message only indicates receive rate if ATXn is greater than 0. The format for the result codes code depends on the Wn command. The setting of the Wn command will determine which of the following connect results codes are displayed (+MCR, +MRR, +ER, +DR, +ILRR). Refer to the Wn command for the detailed description of the command. Note that the supported carrier modes for +MCR can be found in parameter 1 of +MS. The last result code is the CONNECT <text>, where text is the DCE receive rate. Note, the CONNECT <text> is not displayed when ATX0 is indicated, just CONNECT is displayed and is reported by the rules in Table 4.

Table 4. DTE-Modem Data Rate Response Codes

Numeric

Text

 

Numeric

Text

 

 

 

 

 

0

OK

9

 

DELAYED CALL

 

 

 

 

 

1

CONNECT

10

 

BLACKLISTED

 

 

 

 

 

2

RING

11

 

+FCERROR

 

 

 

 

 

3

NO CARRIER

12

 

RINGBACK

 

 

 

 

 

4

ERROR

13

 

CPON=

 

 

 

 

 

6

NO DIALTONE

14

 

CPOF=

 

 

 

 

 

7

BUSY

15

 

DRON=

 

 

 

 

 

8

NO ANSWER

16

 

DROF=

 

 

 

 

 

After sending an AT command string to the modem, the DTE must wait for a response code from the modem before sending a new AT command string to the modem.

12

536EX Chipset Developer’s Manual

Intel Confidential

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Intel 537EX manual Sending Commands, DTE-Modem Data Rate Response Codes, Numeric Text, Delayed Call
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537EX specifications

The Intel 537EX is a powerful and innovative embedded processor designed for a range of applications, particularly in the fields of industrial automation, telecommunications, and transport management systems. This processor is a member of Intel's embedded product line, tailored specifically to meet the demands of systems that require high reliability and long lifecycle support.

One of the main features of the Intel 537EX is its multi-core architecture, which enables efficient parallel processing capabilities. This allows for the execution of multiple tasks simultaneously, significantly improving overall system performance. The processor also incorporates Intel’s advanced power management technology, which ensures that the device consumes energy efficiently, enhances thermal performance, and prolongs the lifespan of the system.

The Intel 537EX supports a range of connectivity options, including high-speed Ethernet and Serial ATA interfaces. This ensures that it can easily integrate into existing systems, seamlessly supporting applications that require robust data transfer capabilities. Additionally, the processor is equipped with multiple I/O ports, facilitating the connection of various peripherals and sensors, which is crucial in industrial applications.

One of the standout technologies within the Intel 537EX is its support for hardware virtualization. This feature allows for the creation of multiple virtual environments within a single physical structure, optimizing resource utilization and enhancing system flexibility. Additionally, Intel’s integrated security technologies provide a significant layer of protection against potential threats, ensuring that embedded systems remain secure.

Another characteristic of the Intel 537EX is its extensive software support, which includes compatibility with various operating systems and development environments. This versatility makes it an attractive choice for developers looking to build or upgrade their embedded systems. With access to Intel's comprehensive software tools, developers can quickly optimize applications to take full advantage of the processor's capabilities.

The Intel 537EX also boasts excellent thermal performance, allowing it to operate efficiently in harsh environments. This is crucial for embedded applications in industrial settings where temperature fluctuations are common. Overall, the Intel 537EX is engineered to deliver high-performance processing power, superior connectivity, and enhanced security, solidifying its position as a reliable choice for demanding embedded applications.
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