HP X09 Manual download pdf (Page 23)

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

4.3. Command Descriptions

Commands in this section are listed alphabetically. Command categories are designated between

the “< >” symbols that follow each command title. XStream Modems expect numerical values in

hexadecimal and those values are designated by a “0x” prefix.

AM (Auto-set MY) Command

<Networking & Security> AM Command is used

to automatically set the MY (Source Address)

parameter from the factory-set modem serial

number. The address is formed with bits 29, 28 and 13-0 of the serial number (in that order).

AT Command: ATAM

Binary Command: 0x3A (58 decimal)

Minimum firmware version required: 4.40

AT (Guard Time After) Command

AT Command: ATAT

Binary Command: 0x05 (5 decimal)

<Command Mode Options> AT Command is

used to set the time-of-silence that follows the

command sequence character (CC Command).

By default, AT Command Mode will activate

after one second of silence.

Parameter Range: 0x02 – 0xFFFF

[x 100 milliseconds]

Number of bytes returned: 2

Default Parameter Value: 0x0A (10 decimal)

Related Commands: BT (Guard Time Before), CC

(Command Sequence Character)

Refer to the AT Command Mode section to view

the default AT Command Mode Sequence.

BD (Interface Data Rate) Command

AT Command: ATBD

Binary Command: 0x15 (21 decimal)

<Serial Interfacing> BD Command allows the

user to adjust the UART interface data rate and

thus modify the rate at which serial data is sent

to the RF modem. The new baud rate does not

take effect until the CN command is issued. The

RF data rate is unaffected by the BD parameter.

Parameter Range (Standard baud rates): 0 – 6

(Non-standard baud rates): 0x7D – 0xFFFF

Parameter

BAUD (bps)

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Most applications will require one of the seven

standard baud rates; however, non-standard

baud rates are also supported.

Note: If the serial data rate is set to exceed the

fixed RF data rate of the XStream modem,

flow control may need to be implemented as

described in the Flow Control sections.

Non-standard Interface Data Rates: When

values outside the range of standard baud rates

are sent, the closest rate represented by the

number is stored in the BD register. For example,

a rate of 19200 bps can be set by sending the following command line: ATBD4B00. NOTE: When

using X-CTU Software, non-standard interface data rates can only be set and read using the X-

CTU ‘Terminal’ tab. Non-standard rates are not accessible through the ‘Modem Configuration’ tab.

Configuration

0 1200

1 2400

2 4800

3 9600

4 19200

5 38400

6 57600

Number of bytes returned: 2

Default Parameter Value: Set to equal modem’s

factory-set RF data rate.

Minimum firmware version required: 4.2B

(Custom baud rates not previously supported)

When a non-standard interface data rate is sent, the UART will adjust to accommodate the

requested rate. In most cases, clock resolution will cause the stored BD parameter to vary from

the parameter that was sent (refer to the table below). Reading the BD command will return the

value that was actually stored to the BD register.

Table4‐02. ParameterSentvs.Pa rameterStored

BD Parameter Sent (HEX) Interface Data Rate (bps) BD Parameter Stored (HEX)

0 1200 0

4 19,200 4

7 115,200 7

12C 300 12B

1C200 115,200 1B207

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 55 56

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