z02215 ZiLOG Semiconductor, z02215 Datasheet - Page 26

• Manufacturer Part Number: z02215
• Description: Single Chip Modem With Integrated Controller, Data Pump, And Analog Front End
• Manufacturer: ZiLOG Semiconductor

PS001907-0904
Command
&D
Data
Terminal
Ready
Options
Table 3. AT Command Set (Continued)
Single Chip Modem with Integrated Controller, Data Pump, and AFE
Function and Description
The &D command determines the modem’s response to the DTR signal from
the terminal.
S-register S25 debounces changes in DTR. During connection, the modem
does not act on changes in DTR until the change is present for the length of
time specified by the setting in S-register S23.
The response to changes in DTR also depend on the value of &Q (See “&Q” on
page 28 for further details).
When DTR is OFF for all possible combinations of the &D and &Q commands,
the results are as described below. The default value is &D0 in North America.
&Q0
&Q1
&Q2
&Q3
A
B
C
D
&D0
None
The modem hangs up the telephone line and issues an OK
result code.
If in the ON-LINE state, the modem goes into the
COMMAND state, and issues an OK result code.
The modem hangs up the telephone line and issues an OK
result code. Auto-Answer is disabled as long as DTR
remains OFF.
The modem resets.
C
C
C
&D1
B
C
C
B
&D2
C
C
C
C
AT Command Set
&D3
D
D
D
D
Z02215
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