18 Basic Modem Operation
There are a few basic commands that do not require the “AT”
command prefix. These are as follows:
Command Description
A/ Repeats the last issued AT command once.
A> Repeats the last issued AT command once, or re-
dials the last dialed number up to 9 times until a
key is pressed or a connection is made.
<any key> Terminates the current connection attempt, if
pressed while modem is handshaking.
+++ Escape code sequence. Entered while the modem
is in Data Mode. Returns modem to Command
Mode.
The U-336S/SA supports several groups of AT commands:
AT Command Set/Type Example
Basic AT (Hayes compatible) ATB0
Basic AT$ (on line help) AT$
Extended AT& commands AT&N0
Extended AT* commands AT*I1
Fax AT+ commands AT+FCLASS=2
S-Register command ATS0=1
S-Register bit-mapped command (set S-
Register bit 1 equal to 1)
ATS13.1=1
S-Register inquiry command ATS0? Or ATS13.1?
You may browse the lists of available commands for each command set
by using the on-line help commands: AT$, AT*$, AT&$, and ATS$.
Further detail on AT commands will be covered in the chapters that
pertain to their use.
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