Modem Result Codes - ZyXEL Communications U-336S User Manual

AT Command Set/Type
Fax AT+ commands
S-Register command
S-Register bit-mapped command (set
S-Register bit 1 equal to 1)
S-Register inquiry command
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.

Modem Result Codes

When you execute or try to execute an AT command, your modem
sends a result code to let you know whether the command was
executed. An OK result code means the AT command you sent was
executed. If you receive an ERROR code, it means the command
was invalid.
The U-336S also provides result codes that show:
• Whether or not a Dial Tone was detected when the modem
originated a call.
• If a busy signal was detected when the modem originated a call.
• If a remote telephone ring was detected when dialing.
• The speed, protocol, and error control/data compression
method used.
• If your modem has detected an incoming ring.
Result codes can originate from any of eight result code sets. The
ATXn command lets you choose which set of result codes your
Example
AT+FCLASS=2
ATS0=1
ATS13.1=1
ATS0? Or ATS13.1?
Basic Modem Operation 19