U.S. ROBOTICS, INC.
MICRO LINK 1200
Card Type | Modem (asynchronous) |
Chip Set | U.S. Robotics |
Maximum Data Rate | 1200bps/300bps |
Data Bus | External |
Data Modulation Protocol | Bell 212A |
V2250
CONNECTIONS | ||||||
Function | Label | Function | Label | |||
Line out/in - unidentified | CN1 | DC power | CN4 | |||
Line in/out - unidentified | CN2 | Power switch | SW1 | |||
RS-232/422 | CN3 | Analog loopback switch | SW2 |
USER CONFIGURABLE SETTINGS | ||
Setting | Label | Position |
Auto answer | SW3/A | Off |
Continuous answer | SW3/A | On |
CD normal | SW3/B | Off |
CD forced high | SW3/B | On |
Equalize for dial-up phone lines | SW3/C | Off |
Equalize for dedicated phone lines | SW3/C | On |
DTR normal | SW3/D | Off |
DTR forced high | SW3/D | On |
í A/A1 normal | J/1 | Unidentified |
A/A1 low when modem is off-hook | J/1 | Unidentified |
í 10-bit character transmission | J/2 | Unidentified |
11-bit character transmission | J/2 | Unidentified |
í Future application - factory configured, do not alter | J/3 | Unidentified |
í Reset | J/14 | Unidentified |
RS232C | ||||
Setting | SW4/A | SW4/B | SW4/C | SW4/D |
Pin 2 receive/Pin 3 send | On | On | Off | Off |
Pin 2 send/Pin 3 receive | Off | Off | On | On |
SERIAL PORT ADDRESS | ||||
Setting | Setting | J/10 | J/11 | J/12 |
COM1 (3F8h) | IRQ4 | On | On | On |
COM2 (2F8h) | IRQ3 | On | Off | Off |
COM3 (3E8h) | IRQ4 | Off | On | On |
COM4 (2E8h) | IRQ3 | Off | Off | Off |
DIAGNOSTIC LED(S) | |||
LED | Color | Status | Condition |
CD | Red | On | Carrier signal detected |
CD | Red | Off | Carrier signal not detected |
ON | Red | On | Power is on |
ON | Red | Off | Power is off |
AL | Red | On | Modem is in analog loopback test mode |
AL | Red | Off | Modem is not in analog loopback test mode |
SD | Red | On | Modem is transmitting data |
SD | Red | Off | Modem is not transmitting data |
RD | Red | On | Modem is receiving data |
RD | Red | Off | Modem is not receiving data |
MISCELLANEOUS TECHNICAL NOTES |
Note: Diagram not available. |
Proprietary AT Command Set
ABORT | |
Type: | Immediate |
Format: | Any key |
Description: | Aborts dialing command issued; modem hangs up. |
ANSWER | |
Type: | Immediate |
Format: | AT [cmds] A |
Description: | Enables answer mode, the modem goes off-hook. |
ATTENTION | |
Type: | Immediate |
Format: | AT [cmds] |
Description: | Tells the modem that a command follows or use alone to test OK result code |
DIAL | |
Type: | Immediate |
Format: | AT [cmds] D<#> [cmds] |
Example: | ATDT 443-3388,,,1111; |
Description: | Dials telephone number according to any modifiers included in the string |
Note: | Any combination of modifiers can be used to produce the desired dial functions in sequence. |
Command | Function |
í P | Pulse dialing enabled |
T | Tone dialing enabled |
, | Dialing paused for 2 seconds to a maximum amount of time specified in S8 register |
ECHO | |
Type: | Configuration |
Format: | AT [cmds] En [cmds] |
Description: | Controls echo function; display keyboard commands when enabled. |
Command | Function |
í E0 | Echo function disabled |
E1 | Echo function enabled |
ECHO - ON-LINE | |
Type: | Configuration |
Format: | AT [cmds] Fn [cmds] |
Description: | Selects whether commands sent while in data mode are echoed |
Command | Function |
F0 | Local echo enabled |
í F1 | Local echo disabled |
ESCAPE SEQUENCE | |
Type: | Immediate |
Format: | +++AT [cmds] <CR> |
Description: | Initiates the escape sequence and returns the modem to the on-line command state if it receives three escape characters set in S2 within the time allotted by S12. |
Note: Do not precede this command with AT. |
REPEAT PREVIOUS COMMAND | |
Type: | Immediate |
Format: | A/ |
Description: | Repeats previous command, mainly used for redial |
Note: Do not precede this command with AT, or follow it with <CR>. |
RESULT CODES | |
Type: | Configuration |
Format: | AT [cmds] Qn [cmds] |
Description: | Enables modem to send result codes to the DTE |
Command | Function |
í Q0 | Result code sending enabled |
Q1 | Result code sending disabled |
RESULT CODE FORMAT | |
Type: | Configuration |
Format: | AT [cmds] Vn [cmds] |
Description: | Selects word or numeric format for information-text and result codes |
Command | Function |
V0 | Numeric format enabled |
í V1 | Verbose (word) format enabled |
SPEAKER MODE | |
Type: | Configuration |
Format: | AT [cmds] Mn [cmds] |
Description: | Selects various speaker options |
Command | Function |
M0 | Speaker disabled |
í M1 | Speaker enabled until carrier signal detected |
M2 | Speaker enabled |
STATUS-REGISTER | ||
Type: | Configuration | |
Format: | AT [cmds] Sn=x [cmds] | |
Description: | Writes to a specified register, values ranging from 0-255. | |
Command | Function | |
S0=x | Sets the number of rings allowed before the modem automatically goes off-hook. Default = 1 | |
S2=x | Selects a character used for the escape sequence. Default = 43 | |
S7=x | Maximum wait time in seconds the modem uses after dialing to detect a carrier signal from the remote modem for both originating and answering calls. Default = 17 |