3 AT
Commands
CommPlete Communications Server
15
for example, determines whether the modem returns result codes, while the &Q
command selects th e asynch ronous communications mode.
A parameter{xe "parameters"}{xe "AT commands:parameters"} after a command (0,
1, 2, etc.) tells the modem which option to use. If you do not specify a parameter,
the modem assumes the 0 (zero) option. E, for example, is the same as E0. You can
issue several commands on a single line (a command string) as long as the line does
not exceed {xe "AT commands:command string limit"}40 characters.
Note:
Each character in a command counts towards the 40 character command line
maximum. While Q1 is a single command, it counts as two characters in the
command line.
Each command has a valid range of parameters;{xe "parameters"} for example, &S
can have only 0 or 1 as a parameter. Valid commands always generate an
OK
result
code, and a few generate an additional response, such as a list of parameters.{xe
"result codes"} An invalid command, such as &S3, which has a parameter outside
the valid range, generates an
ERROR
result code. Most commands have a default
parameter{xe "parameters:default"} that is enabled when the modem is turned on
or reset with the ATZ or AT&F command. Factory defaults are stored in read-only
memory ({xe "ROM (read-only memory)"}ROM{xe "memory:read-only (ROM)"}) ,
and cannot be changed. User-defined defaults can be stored in nonvolatile random-
access memory ({xe "NVRAM (nonvolatile random access memory)"}NVRAM{xe
"memory:nonvolatile (NVRAM)"}), and can be changed or deleted at will.
Command Editing
{
xe "AT commands:attention code"}{xe "AT commands:AT"}Always begin a
command with the letters AT. Enter the entire command string in upper or lower
case, but do not cannot mix cases within the command string. The AT command is not
executed until you press the E
NTER
key. Use the B
ACKSPACE
key to erase the previ-
ous command character. It will not erase the AT characters once they are typed. If
your keyboard has no B
ACKSPACE
key, use C
TRL
+H. (You can change the character
recognized by the modem as B
ACKSPACE
to any other ASCII character by changing
register S5{xe "S-registers:S5"}{xe "backspace character"}. )
Press C
TRL
+X to cancel an entire command that has been typed but not yet executed.
This also clears the command buffer. The effect is the same as backspacing the
command, only quicker.
The modem stores characters entered in a command in it’s command buffer{xe
"command buffer"} until they are executed by pressing E
NTER
. The command buffer’s
capacity is 40 characters. The attention characters{xe "AT commands:attention
code"}{xe "AT commands:AT"} (AT) do not count towards the 40 character command
line maximum. You may use spaces for increased readability when typing a
command. Spaces are not stored in the command buffer, and they do not count
towards the40 character command line maximum. Special characters, such as
hyphens and parentheses, are not allowed.
If you exceed the 40-character limit or type invalid characters, the command buffer
is automatically erased and an
ERROR
message displays. You should retype the
command within the 40-character limit, using only the allowed characters.
The commands in this chapter are organized by function. A brief summary follows.
Summary of Contents for CommPlete MT5634HD8
Page 1: ...MT5634HD8 User Guide Title MTSLOGOK FH5 Creator FreeHand 5 0 CreationDate Fri Aug 23 16 3 ...
Page 7: ...CommPlete Communications Server 1 1 Introduction ...
Page 13: ...CommPlete Communications Server 7 2 Installation ...
Page 18: ......
Page 19: ...CommPlete Communications Server 13 3 AT Commands ...
Page 45: ...CommPlete Communications Server 39 4 S Registers ...
Page 53: ...CommPlete Communications Server 47 5 Warranty Service and Technical Support ...
Page 60: ...MT5634HD8 User Guide 54 CommPlete Communications Server ...
Page 61: ...CommPlete Communications Server 55 Appendices ...
Page 76: ...MT5634HD8 User Guide 70 CommPlete Communications Server ...
Page 77: ...CommPlete Communications Server 71 Glossary ...
Page 92: ...MT5634HD8 User Guide 86 CommPlete Communications Server ...
Page 93: ...CommPlete Communications Server 87 Index ...
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