AT Commands
This section introduces the AT commands available in Hayes modems. The
section provides a general introduction to the AT command structure and
then presents an alphabetical listing of the commands.
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For information about a specific command, click on a command from the following
list:
A - Answer Command
Bn - Communications Options
D - Dial Command
En - Select Echo
Hn - Control Switchhook
I0 - Display Product Code
I2 - Perform ROM Checksum Test
I7 - Version Number
I9 - Identify Plug and Play ID
I12 - Display GCP version strings
Ln - Select Speaker Volume
Mn - Select Speaker Function
Nn - Select Negotiate Handshake
On - Go Online
P - Select Pulse Dial
Qn - Select Result Code
Sn - Write to S register
Sn? - Read an S register
T - Select Tone Dialing
Vn - Result Code Format
Wn - Extended Result Code
Xn - Call Progress
Yn - Long Space Disconnect
Zn - Perform Soft Reset
&An - Originate/Answer for Autoanswer
&B - Disable Auto Retrain
&Cn - Data Carrier Detect
&D - Data Terminal Ready
&F - Factory Defaults
&Gn - Guard Tone
&Jn - Jack Type
&Kn - Flow Control
&Ln - Line Type
&On - Pad Channel
&Pn - Pulse Dial Parameters
&Qn - Communications Mode
&Rn - RTS/CTS Option
&Sn - Data Set Ready
&T0 - Terminate Test
&T1 - Local Analog Loopback
&T3 - Local Digital Loopback
&T4 - Grant RDL Requests
&T5 - Deny RDL Requests
&T6 - Initiate Remote Digital Loopback
&T7 - RDL with Self Test
&T8 - Local Loopback/Self Test
&T19 - RTS/CTS Cable Test
&Un - Disable Trellis Coding
&V - View Configuration Profiles
&V6 - View Blacklist
&V8 - View Call Statistics
&Wn - Store Active Profile
&Xn - Sync Xmit Clock Source
&Yn - Stored Profile for Hard Reset
&Zn=- Stored Telephone Number
&Hn= - Help Menu Commands
%CD - Carrier Detect Lamp
%BAUD - Bit Rate Multiplier
-SSE - Simultaneous Voice Data
-SSG - Set DSVD Receive Gain
-SSP - Select DVSD Port
,comma- Perform Pause
%SPRT Security Mode - Outgoing Calls
%SUID - User ID Outgoing Calls
%SPWD - Password Outgoing Calls
%SSPW - Supervisor Password Outgoing Calls
%SCBR - Call Back Reference Outgoing Calls
%SKEY - Store Authentication Key Outgoing Call
-SUID - Program User ID
-SPWD - Program Password
-SPRT - Remote Security Mode
-SKEY - Program Key
-SSPW - Supervisor Password
-SSKY - Program Supervisor Key
$BRC - Enable/Disable Host
$GIVEBRC - Enter BRC State (from Target Online
Command State)
_+BRC+_ Remote Escape into BRC State (from Host
Online Data Mode)
%CCID - Enable Caller ID
%CRID - Repeat Last ID
+VCID - Caller ID Service
#CID - Enable Caller ID Detection
%CXID - XID Enable
%CDIA - Display last DIAG
%CIDS - Store ID Numbers
%CSIG - Store SIG Numbers
%SPNP - Serial Plug and Play Control
About Commands
With a few exceptions, command names contain a prefix (optional), a
letter, and a suffix (optional).
Prefix &, %, etc.
Letter A, B, etc.
Suffix a number, such as 5
Following are several examples:
Example: &K5 prefix = &
letter = K
suffix = 5
Example: D letter only
Example: I0 letter and suffix
In the command descriptions, the suffix is represented generally by the
letter n. Do not insert spaces in command names. The modem ignores spaces
between commands.
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