MICRO LINK 1200 modem/telephone/ISDN Settings and Configuration

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

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Card Type	Modem (asynchronous)
Chip Set	U.S. Robotics
Maximum Data Rate	1200bps/300bps
Data Bus	External
Data Modulation Protocol	Bell 212A

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

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