Z0221524ASGR50A5 Zilog, Z0221524ASGR50A5 Datasheet - Page 22

• Manufacturer Part Number: Z0221524ASGR50A5
• Description: IC MODEM CONTROLLER 44-LQFP
• Manufacturer: Zilog

Specifications of Z0221524ASGR50A5

• Data Format: V.21, V.22, V.23, Bell 103, Bell 212A
• Baud Rates: 2.4k
• Interface: Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

.
PS001907-0904
Command
A
Note: North American default values are designated by bold type. The operation of these commands, and the default
B
values of option commands, are configurable for operation in different countries.
Answer
Communicat
ion Standard
Option
Table 3. AT Command Set
Single Chip Modem with Integrated Controller, Data Pump, and AFE
Function and Description
The A command causes the modem to go off-hook and respond to an incoming
call. This command is issued after the modem has returned the RING result
code.
If the modems successfully complete the answering process, each returns a
CONNECT result code and enters the ON-LINE state. If no transmit carrier
signal is received from the calling modem within the time specified in S-register
S7, the modem hangs up, returns the NO CARRIER result code, and enters the
IDLE state.
If the modem is in the COMMAND state or &Q2 or &Q3 is selected then the
ERROR result code is returned. Any commands following the A command on
the command line are ignored.
This command is aborted if a character is received from the terminal before the
answer process is completed, or when DTR drops if certain options in the &Q or
&D commands have been used.
The B command specifies special telephone line modulation standards required
for the connection. The modem can be configured to use:
1 – Bell 212A instead of ITU-T V.22 at 1200 bps
2 – Bell 103 instead of ITU-T V.21 at 300 bps
3 – ITU-T V.23 or Bell 202 in data modes with receive and transmit speeds that
differ whether the caller or answerer transmits data at a higher data rate.
4 – In ITU-T V.23 data mode, Minitel line reversals.
5 – ITU-T V.23 or Bell 202T in data modes when the receive and transmit
speeds are different, and with a 4-wire telephone interface instead of a 2-wire
telephone interface
When ON-LINE in data modes with differing receive and transmit speeds (V.23,
Bell 202), the modem recognizes only the Escape Sequence (+++) and modem
commands at the higher of the speeds.
S-register S37 also contributes to the selection of the modulation standard.
This register sets the telephone line data rate, and the split rate data mode (Bell
202/ Bell 202T or V.23).
Both modems must be configured identically to prevent communication failures
caused by incompatible telephone line modulation standards.
AT Command Set
Z02215
16