3-6
Issue 3 April 1994
Manually Answering a Call
The best way to answer a call is to set the Auto-Answer Ring
Number register (S0) to 1 or more rings. The modem is
configured at the factory to automatically answer after a
specified number of rings. The number of rings used as the
factory setting for S0 varies by country and is listed in Table 4-2
in Chapter 4. If S0 = 0, use the ATA command to manually
answer incoming calls.
The format for an ATA command is:
TYPE: ATA (after the modem rings)
PRESS: Enter
NOTE:
DTR must be present (activated by the communications
software) for the modem to answer the call.
Viewing, Selecting, and Saving
Modem Settings
Modem settings determine how the modem functions. These
settings are known as configuration options and are stored in
two permanent memory areas, User 0 and User 1.
When the modem is initially turned ON, the contents of one of
the two memory areas are retrieved into a volatile work area of
memory known as Active. If you should make changes to the
modem’s configuration and turn Off the modem without saving
those changes, then they are lost forever.
On the other hand, User 0 and User 1 are nonvolatile memory
areas that can permanently store configuration options to the
modem’s Electrically Erasable Programmable Read Only
Memory (EEPROM) chip. If your modem requires a particular
configuration to work in an application, then those settings can
be created and saved to one of the two nonvolatile memory
areas.
