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# 3COM CORPORATION
COURIER 1200
Modem Type Data (synchronous/asynchronous)
Maximum Data Rate 1200bps
Data Bus External
Data Modulation Protocol Bell 103A/212A
IMG IMG 1
+------------------------------------------------------------+
| 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.