HP X09 Manuel télécharger pdf (Page 18)

XStream‐PKG‐E™EthernetRFModem–ProductManualv5.x00[2006.02.24]

3.1.5. Command Mode

To modify or read RF module parameters, the module must first enter into Command Mode - a

state in which incoming characters are interpreted as commands and parameters. Two command

types are available for programming the RF modem: AT Commands and Binary Commands.

IMPORTANT: For modified parameter values to persist in the RF modem’s registry, changes must be

saved to non-volatile memory using the WR (Write) Command. Otherwise, parameter values are

restored to previously saved values the next time the RF modem is powered off and then on again.

AT Commands

Enter AT Command Mode:

1. Send the 3-character command sequence “+++” and observe guard times before and after

the command characters. [Refer to “Default AT Command Mode Sequence” below.] The

“Terminal” tab (or other serial communications software) of the X-CTU Software can be used

to enter the sequence.

[OR]

2. Assert (low) the pin and turn the power going to the RF modem off and back on. To

achieve this result, simultaneously press the Reset [Figure 1-02a] and Config [Figure 1-02c]

switches; release the Reset Switch; then after 1 sec., release the Config Switch. The RF

Modem then enters AT Command Mode at the modem’s default baud rate.

The AT Command Mode Sequence (default parameter values are shown in parenthesis):

• Observe Guard Time Before (ATBT = 0x0A, no characters sent for one second)

• Enter three copies of the Command Sequence Character (ATCC = 0x2B, ASCII “+++“)

• Observe Guard Time After (ATAT = 0x0A, no characters sent for one second)

To Send AT Commands:

Send AT commands and parameters using the syntax shown below:

Figure3‐07. SyntaxforsendingATCommands

NOTE: To read a parameter value stored in a register, leave the parameter field blank.

The preceding example would change the RF modem’s destination address to “1F”. To store the

new value to non-volatile (long term) memory, the Write (ATWR) Command must follow.

System Response. When a command is sent to the modem, the modem will parse and execute

the command. Upon successful execution of a command, the modem returns an “OK” message. If

execution of a command results in an error, the modem returns an “ERROR” message.

To Exit AT Command Mode:

1. Send ATCN (Exit Command Mode) Command.

[OR]

2. If no valid AT Commands are received within the time specified by CT (Command Mode

Timeout) Command, the Modem automatically returns to Idle Mode.

For examples that step through the programming the modem using AT Commands, refer to the

RF Modem Configuration [p

20] chapter.

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HP X09 Manuel Page 18