U.S. ROBOTICS, INC.
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.