HP 3000 9x9KS Service Manual page 35

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