Z0221500ZCO Zilog, Z0221500ZCO Datasheet - Page 56

• 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
\R
Sn
&S
?
Minitel line
Reversal With
RTS Options
Set the Current
S-Register to n
Data Set Ready
Read an
S-Register
Function and Description
During V.23 Minitel connections ( B4 and S37 are 1 ) when the
modem is transmitting at 75 bps, the modem can be configured to
perform a Minitel line reversal when RTS changes from ON to
OFF.
To perform a Minitel line reversal, the modem transmitting at 75
bps switches to transmit at 1200 bps and receive at 75 bps. If the
other modem supports and is configured for Minitel operation
with line reversals, it automatically detects the rate switch and
changes its own transmit and receive data rates.
\R0
\R1
This command sets the current S-register to the value n selected
by the user. For example, ATS7 sets the current S-register to S7 .
Default value is 0 . The value assigned to Sn addresses a particular
S-register number so future commands like ? and = read or write
the S-register. Modem reset and the &F command select S0 as the
default S-register.
This command controls Data Set Ready. If &Q 1, &Q2 , or &Q3
(SYNCHRONOUS mode) is selected, the modem’s DSR signal
operates as if &S1 is set. If &Q0 (ASYNCHRONOUS mode) is
selected:
&S0
&S1
This command displays the value of the last S-register named in
the Sn command.
PRELIMINARY
This option does not perform a Minitel line reversal
when RTS changes from ON to OFF. This value is the
default value.
This option performs a Minitel line reversal when RTS
changes from ON to OFF.
This option forces DSR always ON. This value is the
default value in North America.
This option causes the modem’s DSR signal to be
turned ON at the start of handshaking and turned OFF
when the modem is retraining or in the IDLE state.
Evaluation Board User Manual
Z02215 Single-Chip Modem
UM002304-0802
50