Install and Configuration 2-15
The AT commands can now be entered to further configure the internal modem.
In the HP AT command set descriptions, *** (three asterisks) indicate Default Setting.
Table 2-5. HP AT Command Set
Command Values Description
AT Attention code that precedes most command lines.
RETURN Pressing Return executes most commands.
A Answer call, even if no ring present.
A/ Repeat last command. Do not precede this command with AT. Do not
press Return to execute.
A: Continuous redial (10 redials in DOC units) of last number until answered.
(Used only in the U.S.A.)
$An n = 0 or 1 *** $A0 discards data during auto-reliable time period.
$A1 buffers data during auto-reliable time period.
#An n = 0 to 3 *** #A0 means 14,400 to 12,000 to 9600 to 4800 to 2400 to 1200 to 300
bps, on-line.
#A1 means 14,400 bps, on-line, only.
#A2 means 14,400 to 9600 to 4800 bps, on-line, only.
#A3 means 2400 to 1200 to 300 bps, on-line, only.
&Bn n = 0 or 1 *** &B0 means normal transmit buffer size.
&B1 means reduced transmit buffer size.
&BSn n = 0 or 1 &BS0 means maximum transmit block size of 64 characters.
***&BS1 means maximum transmit block size of 256 characters.
$BAn n = 0 or 1 ***$BA0 means Baud Adjust is off, speed conversion is on.
$BA1 means Baud Adjust is on, speed conversion is off.
&Cn n = 0 to 2 &C0 forces Carrier Detect on.
***&C1 lets Carrier Detect act normally.
&C2 lets Carrier Detect drop S24 time on disconnect.
Ds s = phone# Dial a telephone number (s), where s may include up to 60 digits or T, P,
R, comma and; characters.
&Dn n = 0 to 3 &D0 DTR is ignored.
&D1 means modem returns to command state.
&D2 lets modem react to DTR normally.
***&D3 causes modem to reset to modem default parameters.
En n = 0 or 1 E0 means do not echo Command Mode characters.
***E1 means do echo Command Mode characters.
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