Chapter 5
COMMAND REFERENCE
This chapter describes all the available modem commands. The default
settings, if applicable, are indicated by bold characters. Note that in
order to meet local telephone company regulations, some modem
commands might have been removed or set to a different default.
5.1
Answer Call Immediately
A
Command A instructs the modem to take the telephone line off hook
and generate a carrier tone. Incoming calls are manually answered.
5.2 Manual Answer and Auto Answer
An
Range: n=0-255
Unit: Rings
Command An instructs the modem to immediately answer incoming
calls. The number of rings by which the modem goes off hook to
answer is determined by register S0.
If a number follows command An, the modem goes off hook to answer
on the specified number of rings.
For example:
A3
Instructs the modem to auto answer on the third ring and
then enter data state after a connection is successfully
established.
5.3 Attention
Code
AT
Command AT clears the command buffer and informs the modem of
your computer‘s transmission speed and data format. Any command
line, except A/ and +++, must start with an AT prefix and end with a
carriage return.
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