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Z0220516SSGR4259

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
Z02205
ZiLOG
Modem Controller
PS001000-MOD0599 11
Table 2. AT Command Set
Command Function and Description
A Answer The A command causes the modem go off-hook and respond to an incoming call. Uses
this command after the modem has returned the RING result code.
When modems successfully complete the answering process, they each return a
CONNECT result code and enter the On-Line state.
If no transmit carrier signal is received from the calling modem within the time specified
in S-register S7, the modem hangs up, returns the NO CARRIER result code, and enters
the Idle state.
Any commands following the answer command on the command line are ignored.
This command is aborted if a key is pressed before the answer process is completed, or
when DTR is off, if some options in the &Q or &D commands have been used.
B Communication Standard
Option
The B command indicates to the modem which special telephone line modulation
standards to use. The modem can be configured to use:
B0 Uses the ITU-T modulation standards for all telephone line data rates. This
includes V.22 for the 1200 bps telephone line data rate and V.21 for the 300
bps telephone line data rate. If S-register S37 is set to 1 (or 2), then V.23 is
used with the originating modem transmitting at 75 bps and receiving at
1200 bps. If S-register S37 is set to any other value, V.23 is not used.
B1 If the 1200 bps telephone line data rate is required, Bell 212A is used
instead of V.22. This is the default value for North America. The 1200 bps
telephone line data rate is required only if:
• S-register S37 is set to 5, or
• S-register S37 is set to 0, and the terminal data rate is 1200 bps.
If the 300 bps telephone line data rate is required, Bell 103 is used instead
of V.21. The 300 bps telephone line data rate is required only if:
• S-register S37 is set to 3, or
• S-register S37 is set to 0 and the terminal data rate is 300 bps.
If neither the 1200 bps nor 300 bps telephone line data rate are required,
then a setting of B1 is ignored and the modem responds as if B0 was set.
B2 Same as B0 for the 1200 bps and 300 bps telephone line date rate. Uses
V.23 with the originating modem transmitting at 1200 bps and receiving at
75 bps, if S-register S37 is set to 1 or 2.
B3 Same as B0 for the 1200 bps and 300 bps telephone line date rate. Uses
V.23 with the originating modem transmitting at 75 bps and receiving at
1200 bps, if S-register S37 is set to 1 or 2.
&C Data Carrier Detect
Options
&C determines how the modem’s DCD signal relates to the carrier signal from the other
modem. This option occurs only at the beginning of a telephone line connection. If &C is
issued from the Command state, it will not have an immediate effect.
&C0 During asynchronous operation (&Q0 in effect), DCD is on at all times.
During synchronous operation (&Q1), DCD indicates the state of the
carrier signal from the other modem using S-registers S9 and S10. This is
the default value in North America.
&C1 Indicates the state of the carrier signal from the other modem using S-
registers S9 and S10.
Z02205
Modem Controller
ZiLOG
12 PS001000-MOD0599
D Dial The D command causes the modem to dial a telephone call according to the digits and
dial modifiers in the dial string following the command. Any commands following the
dial string on a command line are ignored, unless the semicolon dial modifier is the last
character in the dial string. If the modem is off-hook when the Dial command is given,
the modem dials immediately without trying to detect a dial tone. Characters other than
digits and dial modifiers in a dial string are ignored; however, they are counted as
characters in the command line buffer.
If line current sensing is enabled, and line current is detected before the modem is taken
OFF-HOOK when the modem dials, a NO CARRIER result code is displayed and the
modem enters the IDLE state. If the modem needs not dial (that is, ATD with no dial
string), the modem assumes the call was manually established and attempts to make a
connection.
The D command is not valid when the modem is in the On-Line state.
See “Dial Modifiers and “Modem Result Codes for more information.
&D Data Terminal Ready
Options
&D determines how the modem responds to the DTR signal from the terminal. The
country configuration may prevent the modem from detecting terminal DTR. In this
case, the modem assumes DTR is always on. In North America, terminal DTR is
normally detected. If DTR detection has been prevented, the modem will respond with
an ERROR result to this command.
The response to changes in DTR also depends on the &Q and &D commands. This table
defines what happens when DTR goes off for all possible combinations of the &D and
&Q commands. To see what happens when DTR goes on, refer to the &Q command. The
default value is &D0 in North America:
&D0 &D1 &D2 &D3
&Q0 None B C D
&Q1 A B C D
A The modem hangs up the telephone line and issues an OK result code.
B If in the On-Line state, the modem goes into the Command state, and issues
an OK result code.
C The modem hangs up the telephone line and issues an OK result code.
Auto-Answer is disabled as long as DTR stays off.
D The modem resets.
Table 2. AT Command Set (Continued)
Command Function and Description
Z02205
ZiLOG
Modem Controller
PS001000-MOD0599 13
E Command Mode
Character Echo
E tells the modem to echo or not echo characters sent from the terminal while the modem
is accepting AT commands.
E0 Does not echo characters sent from the terminal.
E1 Echo characters sent from the terminal. This is the default value in North
America.
%E Automatic Retrain
Options
The %E command controls whether the modem will initiate retrain with the other
modem during a telephone line connection during operation in data modes supporting
retrain. The modem always responds to a retrain operation initiated by the remote
modem. The modem can be forced to initiate a retrain by the On-Line (O1) command.
%E0 Do not initiate a retrain.
%E1 Initiate a retrain if the datapump indicates that one is required.
&F Recall Factory Profile &F changes these AT command options and S-registers to default
values. The default values may be changed for use in different countries. The values for
North America are:
S-registers
S0=0 S1=0 S2=43 S3=13 S4=10 S5=8
S6=2 S7=30 S8=2 S9=6 S10=14 S11=95
S12=50 S17=10 S25=5 S28=0 S29=25 S37=0
Commands
B1 E1 M1 P Q0 V1 X4 &C0 &D0 &G0 &P0 &Q0 %E1
&G Guard Tone Options &G indicates the modem which guard tone to transmit when the modem is transmitting
the high band (that is, answer handshake and answer mode).
&G0 No guard tone. This is the default value in North America.
&G1 550-Hz guard tone (V.22 and V.22bis only)
&G2 1800-Hz guard tone (V.22 and V.22bis only)
H Hook H0 Hangs up the telephone line.
H1 Goes off hook without answering a telephone call. This may be disabled in
countries prohibiting its use.
Table 2. AT Command Set (Continued)
Command Function and Description
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Z0220516SSGR4259

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Manufacturer:
ZiLOG
Description:
Network Controller & Processor ICs OTP CONTROLLER 86E34
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