3COM CORPORATION
US ROBOTICS 1200
Modem Type |
Data (synchronous/asynchronous) |
Maximum Data Rate |
1200bps |
Data Bus |
External |
Data Modulation Protocol |
Bell 103A/212A |
CONNECTIONS | |||
Purpose |
Location |
Purpose |
Location |
Line out |
CN1 |
Power |
CN4 |
Line in |
CN2 |
Volume |
SW3 |
RS-232/422 |
CN3 |
Power |
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 |
» Verbose result codes enabled |
On |
Numeric result codes enabled |
Off |
RESULT CODES DISPLAY | |
Setting |
SW1/3 |
» Display enabled |
On |
Display disabled |
Off |
ECHO COMMANDS DISPLAY | |
Setting |
SW1/4 |
» Local echo enabled |
Off |
Local echo disabled |
On |
AUTO ANSWER | |
Setting |
SW1/5 |
» Modem doe not answer on first ring |
On |
Modem answers on first ring |
Off |
CARRIER DETECT | |
Setting |
SW1/6 |
» CD normal |
Off |
CD forced high |
On |
MULT-LINE INSTALLATION | |
Setting |
SW1/7 |
» Single phone connected |
Off |
Multiple phones connected |
On |
AT COMMAND SET | |
Setting |
SW1/8 |
» AT command set recognized |
On |
AT command set disabled |
Off |
Proprietary AT Command Set
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. |