Specifications

TechMemo 01-0011B August 26, 2004

15 of 24

Default modem settings

These are the default or factory settings loaded into US Robotics 56K V.90 and V.90 Faxmodems:

Item Name Description

atz4

ati4

• atz4 — an AT command that resets the current modem settings to the factory hardware

settings. However, the atz4 command does not change the user-defined Y0 through Y4

settings.

• ati4 — an AT command that displays the modem’s current settings.

Basic command settings — see “AT commands” on page 16 for more information.

These basic commands can be set using either an AT command or by changing a DIP switch (see

“DIP switches” on page 14):

• E0 (DIP switch #4)

• Q0 (DIP switch #3)

• V1 (DIP switch #2)

A command set by a DIP switch can be changed using an AT command. However, when the

modem is powered off and on, the DIP switch setting is used.

BAUD=19200

PARITY=N

WORDLEN=8

Baud rate, parity, data format — these values are determined by the settings of the COM port

connected to the modem.

D &A3, &B1, . . . &Y1 Ampersand (&) command settings — see “AT commands” on page 16 for more information.

E S00=001 . . . S40=001

S registers — memory locations that contain various modem parameters — see “S registers” on

page 21.