3COM CORPORATION
US ROBOTICS 2400
Modem Type |
Data (synchronous/asynchronous) |
Maximum Data Rate |
2400bps |
Data Bus |
External |
Fax Class |
Class I & II |
Data Modulation Protocol |
Bell 103A/212A ITU-T V.22bis |
CONNECTIONS | |||
Purpose |
Location |
Purpose |
Location |
Line out |
CN1 |
Power in |
CN4 |
Line in |
CN2 |
Volume |
R1 |
RS-232/422 |
CN3 |
Power switch |
SW2 |
DIAGNOSTIC LED(S) | |||
LED |
Color |
Status |
Condition |
LED1 |
Red |
On |
Analog loopback self test mode |
LED1 |
Green |
On |
Data mode |
LED2 |
Red |
Blinking |
Modem is transmitting/receiving data |
LED2 |
Green |
On |
Carrier signal detected |
DTR SIGNAL | |
Setting |
SW1/1 |
» On |
DTR forced high |
Off |
DTR normal |
RESULT CODES | |
Setting |
SW1/2 |
» Off |
Extended result codes enabled |
On |
Extended result codes disabled |
RESULT CODES DISPLAY | |
Setting |
SW1/3 |
» On |
Display disabled |
Off |
Display enabled |
ECHO DISPLAY | |
Setting |
SW1/4 |
» Off |
Local echo enabled |
On |
Local echo disabled |
AUTO ANSWER | |
Setting |
SW1/5 |
» On |
Modem doe not answer on first ring |
Off |
Modem answers on first ring |
CARRIER DETECT | |
Setting |
SW1/6 |
» Off |
CD normal |
On |
CD forced high |
MULTIPLE PHONE INSTALLATION | |
Setting |
SW1/7 |
» Off |
Single phone connected |
On |
Multiple phones connected |
AT COMMAND SET | |
Setting |
SW1/8 |
» On |
AT command set recognized |
Off |
AT command set disabled |
Proprietary AT Command Set
TIME DISPLAY | |
Type: |
Immediate |
Format: |
AT [cmds] Kn [cmds] |
Example: |
AT K1 *L2 #E1<CR> |
Description: |
Displays the current call time or clock time. |
Command |
Function |
K0 |
Display length of last call. |
K1 |
Display actual time. |
HELP SCREENS | |
Type: |
Immediate |
Format: |
AT <prefix>$ |
Example: |
AT &$ <CR> |
Description: |
Shows command help screens for all commands beginning with the given prefix, or no prefix if none is given. |
Command |
Function |
$ |
Shows ATx help screen. |
D$ |
Shows ATDx help screen. |
S$ |
Shows S-register help screen. |
REPEAT COMMAND STRING | |
Type: |
Configuration |
Format: |
AT [cmds] > |
Example: |
AT DT1(303) 443-3388 > <CR> |
Description: |
Causes modem to repeat command string until a keyboard key is pressed. |
ANALOG LOOPBACK SELF TEST | |
Type: |
Register |
Format: |
AT [cmds] S16=n [cmds] |
Example: |
ATS16=139 <CR> |
Description: |
Selects the tone dialing test. |
Command |
Function |
0 |
Data mode. |
1 |
Analog loopback. |
2 |
Dial testing. |
4 |
Test pattern. |
5 |
Analog loopback and test pattern. |