3COM CORPORATION
COURIER 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 |
CN2 |
DC power |
CN4 |
Line in |
CN1 |
Power switch |
SW1 |
RS-232/422 |
CN3 |
DTR SIGNAL | |
Setting |
SW2/1 |
» On |
DTR forced high |
Off |
DTR normal |
RESULT CODES | |
Setting |
SW2/2 |
» Off |
Verbal result codes enabled |
On |
Numeric result codes enabled |
RESULT CODES DISPLAY | |
Setting |
SW2/3 |
» On |
Display enabled |
Off |
Display disabled |
ECHO COMMANDS DISPLAY | |
Setting |
SW2/4 |
» Off |
Local echo enabled |
On |
Local echo disabled |
AUTO ANSWER | |
Setting |
SW2/5 |
» On |
Modem does not answer on first ring |
Off |
Modem answers on first ring |
CARRIER DETECT | |
Setting |
SW2/6 |
Off |
CD normal |
» On |
CD forced high |
MULTILINE PHONE INSTALLATION | |
Setting |
SW2/7 |
» Off |
Single phone connected |
On |
Multiple phones connected |
AT COMMAND SET | |
Setting |
SW2/8 |
» On |
AT command set recognized |
Off |
AT command set disabled |
ESCAPE CODE | |
Setting |
SW2/9 |
» On |
Go to command mode and display OK result code when escape character is received |
Off |
Disconnect, go to command mode and display NO CARRIER when escape character is received |
DTR RESET | |
Setting |
SW2/10 |
» Off |
DTR normal |
On |
Reset 50ms after receiving DTR low signal. |
TX/RX PIN ASSIGNMENT | |
Setting |
SW3 |
» Off |
Normal operation |
On |
Reverse TX/RX pin assignments |
DIAGNOSTIC LED(S) | |||
LED |
Color |
Status |
Condition |
HS |
Red |
On |
Modem is operating at 4800bps or faster |
HS |
Red |
Off |
Modem is operating at slower than 4800bps |
AA |
Red |
On |
Auto-answer enabled |
AA |
Red |
Off |
Auto-answer disabled |
CD |
Red |
On |
Carrier signal detected |
CD |
Red |
Off |
Carrier signal not detected |
OH |
Red |
On |
Modem is off-hook |
OH |
Red |
Off |
Modem is on-hook |
RD |
Red |
On |
Modem is receiving data |
RD |
Red |
Off |
Modem is not receiving data |
TD |
Red |
On |
Modem is transmitting data |
TD |
Red |
Off |
Modem is not transmitting data |
TR |
Red |
On |
DTR signal is high |
TR |
Red |
Off |
DTR signal is low |
MR |
Red |
On |
Power is on |
MR |
Red |
Off |
Power is off |
AL |
Red |
On |
Analog loopback self test mode |
AL |
Red |
Off |
Normal operation |
Proprietary AT Command Set
See document V1254 for a full command summary.