Z0221500ZCO Zilog, Z0221500ZCO Datasheet - Page 44

• Manufacturer Part Number: Z0221500ZCO
• Description: Z02215 ONE-CHIP MODEM EVAL KIT
• Manufacturer: Zilog

Specifications of Z0221500ZCO

• Main Purpose: Telecom, Modem
• Utilized Ic / Part: Z02215
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Using The AT Command Set
Mnemonic Name
&D
Data Terminal
Ready Options
Function and Description
This command determines how the modem responds to the DTR
signal from the terminal. The country configuration may prevent
the modem from detecting a terminal DTR. In this case, the
modem assumes DTR is always ON. In North America, a
terminal DTR signal is detected. If DTR detection is prevented,
the modem will respond with an ERROR result to this command.
Default value is &DO in North America
S-register S25 debounces changes in DTR. During connections,
the modem does not act on changes in DTR until the change is
present for the amount of time specified in S25 .
The response to changes in DTR also depends on the value of &Q .
For information about DTR and &Q when DTR is on, set &Q . The
table below defines what happens when DTR goes OFF for all
possible combinations of the &D and &Q commands.
&Q0
&Q1
&Q2
&Q3
A
B
C
D
PRELIMINARY
&D0
None
C
C
C
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 stays OFF.
The modem resets.
&D1
B
C
C
B
Evaluation Board User Manual
Z02215 Single-Chip Modem
&D2
C
C
C
C
&D3
D
D
D
D
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