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ML7012-04

2400 bps Single Chip Full Duplex Data Modem with Protocol

Oki Electric Industry 

1Semiconductor

FEDL 7012-04-01

ML7012-04

CMD

P

Q

S

T

V

X

Z

&C

&D

&G

&P

Style

ATP

ATQn

ATSr

ATSr?

ATSr = d

ATT

ATVn

Function

Initial Value

Sets dialing mode to pulse.

—

Selects the result code transmission.

n = 0: Result code is transmitted.

0

n = 1: Result code is not transmitted.

Sets the pointer value for S resistor to “r”.

—

Echoes back the content of S resistor specified by “r”.

—

Sets the content of S resistor specified by “r” to “d’.

—

Sets dialing mode to DTMF.

—

Selects the type of result code.

n = 0: Number

1

n = 1: Characters

Selects the extended result code and call progress tone

detection.

n

01234

Function

Result Code

ATXn

o o o o o Line connection

300 bps

CONNECT

— o o o o Line connection CONNECT 1200

1200 bps

4

— o o o o Line connection CONNECT 2400

2400 bps

— — o — o Dial tone detection NO DIAL TONE

——— o o

Busy tone

BUSY

detection

ATZ Reset in the same way the PDN/RST pin is set to “0”.

—

Controls data carrier detection signals (DCD).

AT&Cn n = 0: Always sets DCD to ON.

0

n = 1: Controls DCD by detecting reception carriers.

Controls the modem in DTR signal state.

n = 0: Ignores DTR signals.

n = 1: Ignores DTR signals. In data mode, however, moves

AT&Dn

to on-line command mode when DTR signals change from

ON to OFF

2

n = 2, 3: Goes to command mode after disconnecting lines

when the change of DTR from ON to OFF is detected during

communication.

Sets the guard tone transmission.

AT&Gn

n = 0: No guard tone

n = 1: With guard tone of 550 Hz

0

n = 2: With guard tone of 1800 Hz

Selects the make rates of pulse dialing.

AT&Pn

n = 0: 39% (10 pps)

n = 1: 33% (10 pps)

1

n = 2: 33% (20 pps)

Note

12/22

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