User Guide
82.....Avocent® ACS 6000 Advanced Console Server
Basic modem result codes
There are basic codes the modem will issue in response to processing an AT command. Result
codes may be displayed either in word (V1) or numeric (V0) format by using the Vn command. The
Qn command controls if result codes are issued (Q0) or not issued (Q1). The Xn, Wn commands
and register S95 determines which result code format the modem will display to indicate the type of
connection established. There are more than 300 codes. The most commonly used are listed in the
table below.
Numeric Verbose Description
0 OK The modem has received and acknowledged the command.
1 CONNECT Connection made at 300bps or extended result codes are off (X0).
2 RING An incoming ring signal has been detected.
3 NO CARRIER
This result code reflects either an intended disconnect or a failure to complete a
connection.
4 ERROR An invalid command was issued to the modem.
5
CONNECT
1200
Indicates a 1200bps line or DTE connection.
6 NO DIALTONE
7 BUSY The modem has detected a busy tone.
8 NO ANSWER After S7 time has elapsed, the remote server never answered.
10
CONNECT
2400
Line speed or DTE connection at 2400bps.
12
CONNECT
9600
Line speed or DTE connection at 9600bps.
15
CONNECT
14400
Line speed or DTE connection at 14400bps.
16
CONNECT
19200
Line speed or DTE connection at 19200bps.
17
CONNECT
38400
Line speed or DTE connection at 38400bps.
18
CONNECT
57600
Line speed or DTE connection at 57600bps.
Basic Result Code Listing
Digital line guard
The modem has an optional Digital Line Guard Circuit that automatically detects an over current
situation on the Tip and Ring pins. When the modem goes off hook, it will immediately check the
current on the Tip and Ring pins. If the current exceeds 150 mA, the modem will display the
“DIGITAL LINE DETECTED” result code and then go back on hook. The modem will continue to
display this result code until normal current is detected on the Tip and Ring pins during an off hook
condition. The DLG feature will protect the modem in case it is accidentally connected to a Digital
Telephone Line.