Velocity Edge GX440 Specifications download pdf (Page 20)

MP 700 Series GPS AT Command Reference

Note: When concatenated

together, AT commands may not

function predictably. It is best to

avoid concatenating commands

without first testing and verifying

the results.

Specific settings for buffer controls are described in the

relevant commands and registers. Normal configuration of the

modem will not require you to adjust these settings.

Data flow control The modem’s CTS and RTS lines control

data flow. Where large amounts of data are being exchanged,

local hardware flow control must be used to prevent buffer

overflows; it is required for PPP connections. Hardware flow

control is enabled by default. (See the

+IPR command on

page 98).

Command Handling

AT can be issued as a command without parameters. It acts like

a “ping” to the modem and always gives a result code of

(unless quiet mode is enabled).

Commands are not case-sensitive; they may be entered in

upper or lower case, or a combination. Arguments to

commands may be case-sensitive.

Concatenation

More than one command can be included in a single line,

although some commands or their parameters must be placed

at the end of the line. When concatenating commands, a space

between basic commands is optional. Where extended

commands (those beginning with a non-alphabetic character

after the

AT) are concatenated, they must be separated by a

semicolon (

;).

Commands are executed in the order entered. If a command

results in the

ERROR result code the balance of the command

line is ignored. Only one result code is returned for the entire

command line. The complete concatenated command string

must not exceed the

200-character command buffer limit. (See

page 17).

Parameters

Most AT commands support one or more parameters, usually

a number. Allowed values are specified in this reference.

Commands that normally accept a single numeric option

switch (

[<n>]) and are issued without that parameter will

assume a value of zero (

0).

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Velocity Edge GX440 Specifications Page 20

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