HP 82718A Expansion Pod Reference Manual page 88

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Low-Level Modem Command Dictionary
the 0 command for details. If the modem was in VOICE mode and no voice connection had yet been
made, the modem will enter MODEM mode and remain on-hook. In this case, no response is returned.
• If you attempt to enter MODEM mode when the modem is off-hook, the modem will enter either
ANSWER
or
ORIGINATE
mode depending on whichever was the last mode the modem operated in.
When off-hook, either hang up the modem before executing
M,
or use the A (ANSWER) or 0
(ORIGINATE)
commands to define explicitly the off-hook mode you want to enter.
Responses: 0, I, 2, 3, 5, B
N (NEW)
I
N
command character
t'10DOUT
II
~.~~.~ !
II
:~.:CHF.:$
0::
1 :::)
Changes the low-level modem command character to a new value. The command character can be any
7-bit ASCII character except
.~~.
(backspace-ASCII 8 or control-H), CAN (cancel-ASCII 24 or
control-X), comma, and carriage return. The command character is set to
%
when the modem is turned on
or initialized, and is not preserved while the modem is off.
Responses: none
o
(ORIGINATE)
t'10DOUT
II
\0
II
:~.:CHF.:$
( 1 :::)
Takes the modem off-hook and places it into ORIGINATE mode. The modem then monitors the phone
line to determine its status. If the modem was already off -hook and detects an answer tone, it issues an
originate tone and reports CONNECT. If no answer tone is detected within about SO s, the modem reports
BAD ANS (out-of-frequency answer tone) or NO ANS (no dial tone or an unsteady tone). If the modem
hears a dial tone when the 0 command is executed, it will wait about 7 s, then report
BAD ANS.
If the
modem detects a busy signal from a previous dialing operation, it reports BUSY.
If the modem detects a ring from a previous dialing operation, it starts counting rings and reports RI NG
after each one. If the maximum number of rings is exceeded (the ring count
+
4, up to a limit of nine), or
if no answer tone is received within SO s after the last dialing operation ended, the modem reports
NO
ANS. If an answer tone is detected, the modem issues an originate tone and reports CONNECT.
After the BAD ANS, BUSY, or NO ANS responses are reported, the modem goes on-hook and into MODEM
mode.
The significance of the BAD ANS and NO ANS responses as they relate to dialing is explained in "Adaptive
Dialing" in Section 2.
Responses: 0, I, 2, 5, B
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