Card Type	Modem (synchronous/asynchronous)
Processor	Z80
Processor Speed	10MHz
Maximum Onboard Memory	64KB DRAM
Maximum Data Rate	14.4Kbps
Data Bus	Serial
Data Modulation	Bell 103A/212A ITU-T V.21, V.22, V.23, V.22bis, V.32, V.32bis
Error Correction/Compression	MNP5, MNP10, V.42, V.42bis

CONNECTIONS
Function	Label	Function	Label
Line out	CN1	Volume control	R1
Line in	CN2	Talk/Data switch	SW4
AC power in	CN3	Originate/Answer switch	SW5
RS232/422 port	CN4	Reset switch	SW6

USER CONFIGURABLE SETTINGS
Setting	Label	Position
Minimum receive signal level set to -43 dBm	JP4	Pins 1 & 2 closed
Minimum receive signal level set to -33 dBm	JP4	Pins 2 & 3 closed
í Factory configured - do not alter	JP8/A	Closed
í Factory configured - do not alter	JP8/B	Open
í Factory configured - do not alter	JP8/C	Open
í Factory configured - do not alter	JP9/A	Closed
í Factory configured - do not alter	JP9/B	Open
í Factory configured - do not alter	JP9/C	Open

USER CONFIGURABLE SETTINGS (CON’T)
Setting	Label	Position
Pin 1 of serial port connected to signal ground	JP10	Pins 2 & 3 closed
Pin 1 of serial port connected to chassis ground	JP10	Pins 1 & 2 closed
Pin 18 has no function	JP11/A	Open
Modem performs local analog loopback test when pin 18 goes high	JP11/A	Closed
í Factory configured - do not alter (for North America)	SW3/7	On
í Factory configured - do not alter (for North America)	SW3/8	On
Note: If pin 18 is enabled, busy out must be disabled.

LINE TYPE SELECTION
Setting	JP1/A	JP1/B	JP1/C
Leased line (0 dBm)	Open	Open	Closed
Permissive (-10 dBm)	Closed	Open	Open
Programmable (-12 dBm)	Open	Closed	Open

BUSY OUT SELECTION
Setting	JP11/B	JP11/C
Busy out enabled	Closed	Open
Busy out disabled	Open	Closed
Note: If busy out is enabled, pin 18 must be disabled.

LEASED LINE TRANSMISSION LEVEL SELECTION
Setting	SW3/1	SW3/2	SW3/3
-2 dBm	On	On	On
-4 dBm	Off	On	On
-6 dBm	On	Off	On
-8 dBm	Off	Off	On
-10 dBm	On	On	Off
-12 dBm	Off	On	Off
-14 dBm	On	Off	Off
-16 dBm	Off	Off	Off

SWITCHED LINE TRANSMISSION LEVEL SELECTION
Setting	SW3/4	SW3/5	SW3/6
-2 dBm	On	On	On
-4 dBm	Off	On	On
-6 dBm	On	Off	On
-8 dBm	Off	Off	On
-10 dBm	On	On	Off
-12 dBm	Off	On	Off
-14 dBm	On	Off	Off
-16 dBm	Off	Off	Off

CONFIGURATION MODE FUNCTION
Mode	Function
0	Normal operation of modem - sets power-up defaults for various commands
1	Sets user profile that will be loaded at power-up
2	Performs diagnostic tests
3	Modifies factory default settings loaded by &F command
4	Sets power-up defaults for V.25bis synchronous and dumb synchronous modes
Note: The QX/4232bis+ modem can be configured by switches in five modes, although command configuration is preferable when possible. Configuration modes 1, 3, and 4 can be stored in NVRAM by pressing the reset switch. Mode 0 is read on reset or power-up. Before operating, the modem’s switches should be returned to mode 0 and the appropriate settings made.

CONFIGURATION MODE SELECTION
Mode	Command Set	Async/Sync	SW1/1	SW1/2	SW1/3	SW1/9
0	AT	Async	See mode 0	Off	On	On
0	V.25bis	Async	See mode 0	On	On	On
1	N/A	N/A	Off	Off	Off	On
2	N/A	Async	See mode 2	On	Off	On
2	N/A	Sync	See mode 2	On	Off	Off
3	N/A	N/A	On	Off	Off	On
4	V.25bis	Sync	See mode 4	On	On	Off
4	None	Sync	See mode 4	Off	On	Off

USER CONFIGURABLE SETTINGS
Setting	Label	Position
í Modem goes to command mode and disconnects on low DTR	SW1/1	On
Modem ignores DTR	SW1/1	Off
í Command echo enabled	SW1/4	On
Command echo disabled	SW1/4	Off
í Auto-answer on one ring	SW1/5	On
Auto-answer disabled	SW1/5	Off
í Command sets enabled	SW1/8	Off
Command sets disabled	SW1/8	On
í Originate/Answer button determines mode	SW1/10	On
Force answer mode	SW1/10	Off
í Error correction result codes enabled	SW2/5	Off
Extended result codes disabled	SW2/5	On
í User profile loaded on reset and power up	SW2/6	On
Factory profile loaded on reset and power up	SW2/6	Off
í Switch configuration enabled	SW2/7	Off
Switch configuration disabled	SW2/7	On
í Serial port speed locked	SW2/8	Off
Serial port speed follows connect speed	SW2/8	On
Note: SW2/8 has no function in V.25bis mode.

CD, CTS, AND DSR SIGNAL CONFIGURATION
Setting	SW1/6	SW1/7
CD, CTS, and DSR forced high	On	On
CD normal, CTS follows CD, DSR follows OH	On	Off
CD, CTS, and DSR forced high except at disconnect	Off	On
í CD normal, CTS and DSR forced high	Off	Off

FLOW CONTROL SELECTION
Setting	SW2/1	SW2/2
Flow control disabled	On	On
Bidirectional XON/XOFF flow control enabled	On	Off
í Bidirectional RTS/CTS flow control enabled	Off	On
CTS flow control by DCE enabled	Off	Off

CONNECT MODE SELECTION
Setting	SW2/3	SW2/4
Normal mode enabled	On	On
MNP reliable mode enabled	On	Off
í Auto-reliable mode enabled	Off	On
LAPM or MNP reliable mode	Off	Off

USER CONFIGURABLE SETTINGS
Setting	Label	Position
í Factory configured - do not alter	SW1/6	N/A
í Factory configured - do not alter	SW1/7	N/A
í Factory configured - do not alter	SW1/8	N/A
í Originate/Answer button determines mode	SW1/10	On
Force answer mode	SW1/10	Off
í Factory configured - do not alter	SW2/1	N/A
í Factory configured - do not alter	SW2/2	N/A
í Factory configured - do not alter	SW2/3	N/A
í Factory configured - do not alter	SW2/4	N/A
í Factory configured - do not alter	SW2/5	N/A
í Factory configured - do not alter	SW2/6	N/A
í Factory configured - do not alter	SW2/7	N/A
í Factory configured - do not alter	SW2/8	N/A

USER PROFILE SELECTION
Setting	SW1/4	SW1/5
User profile 0	On	On
User profile 1	On	Off
User profile 2	Off	On
User profile 3	Off	Off

TOGGLE SWITCHES
Function	Label		Function		Label
Start or stop test in progress		SW1/1		Start or stop test in progress		SW4

USER CONFIGURABLE SETTINGS
Setting	Label	Position
Modem will perform local digital loopback test	SW1/4	Off
Modem will not perform local digital loopback test	SW1/4	On
Modem will perform local analog loopback test	SW1/5	Off
Modem will not perform local analog loopback test	SW1/5	On
SW1/5 performs local analog loopback with self-test	SW1/6	Off
SW1/5 performs local analog loopback test	SW1/6	On
í Factory configured - do not alter	SW1/7	N/A
í Factory configured - do not alter	SW1/8	N/A
í Factory configured - do not alter	SW1/10	N/A
í Factory configured - do not alter	SW2/1	N/A
í Factory configured - do not alter	SW2/2	N/A
í Factory configured - do not alter	SW2/3	N/A
í Factory configured - do not alter	SW2/4	N/A
í Factory configured - do not alter	SW2/5	N/A
í Factory configured - do not alter	SW2/6	N/A
í Factory configured - do not alter	SW2/7	N/A
í Factory configured - do not alter	SW2/8	N/A
Note: The modem will conduct tests in synchronous or asynchronous mode according to where SW1/9 was set the last time it was reset.

USER CONFIGURABLE SETTINGS
Setting	Label	Position
Verbose result codes enabled	SW1/6	On
Numeric result codes enabled	SW1/6	Off
Pins 18 and 21 have no function	SW1/7	On
Perform local analog loopback test when pin 18 is high, remote digital loopback test when pin 21 is high	SW1/7	Off
\K set to 0	SW1/8	Off
\K set to 5	SW1/8	On
Originate/Answer button determines mode	SW1/10	On
Force answer mode	SW1/10	Off
Inactivity timer disabled	SW2/1	On
Inactivity timer set to 15 minutes	SW2/1	Off
Modem-to-modem flow control disabled	SW2/2	On
Modem-to-modem flow control enabled	SW2/2	Off
Parity checking of flow control and escape characters disabled	SW2/3	On
Flow control and escape characters will be processed only if their parity matches serial port	SW2/3	Off

RESULT CODE CONFIGURATION
Setting	SW1/4	SW1/5
Result codes enabled	On	On
Result codes disabled	On	Off
Result codes enabled on originate only	Off	N/A

PARITY SELECTION
Setting	SW2/4	SW2/5	SW2/6
Modem will use eight data bits, no parity	On	On	On
Modem will use seven data bits, odd parity	On	On	Off
Modem will use seven data bits, even parity	On	Off	On
Modem will use seven data bits, MARK parity	On	Off	Off
Modem will use seven data bits, SPACE parity	Off	On	On
Modem will use eight data bits, odd parity	Off	On	Off
Modem will use eight data bits, even parity	Off	Off	On
Modem will use eight data bits, MARK parity	Off	Off	Off

SPEED SELECTION
Setting	SW2/7	SW2/8
Serial port speed set to 38.4Kbps; line speed set to 14.4Kbps	On	On
Serial port speed set to 19.2Kbps; line speed set to 14.4Kbps	On	Off
Serial port and line speeds set to 9600bps	Off	On
Serial port speed set to 57.6Kbps; line speed set to 14.4Kbps	Off	Off

USER CONFIGURABLE SETTINGS
Setting	Label	Position
Modem goes to command mode and disconnects on low-to-high DTR transition	SW1/1	On
Modem ignores DTR	SW1/1	Off
Originate/Answer button determines mode	SW1/10	On
Force answer mode	SW1/10	Off
Pins 18 and 21 have no function	SW2/3	On
Perform local analog loopback test when pin 18 is high, remote digital loopback test when pin 21 is high	SW2/3	Off
Auto-answer on one ring	SW2/7	Off
Auto-answer disabled	SW2/7	On
Modem will match connect speeds.	SW2/8	On
Modem will connect only at current speed.	SW2/8	Off

STORED NUMBER SELECTION
Setting	SW1/4	SW1/5
Manual dial only	On	On
Dial first stored number when Talk/Data switch is pressed	On	Off
Dial second stored number when Talk/Data switch is pressed	Off	On
Dial third stored number when Talk/Data switch is pressed	Off	Off

LINE TYPE SELECTION
Setting	SW1/6	SW1/7	SW1/8
Modem is connected to switched line	On	On	On
Modem is connected to 2-wire leased line	Off	On	On
Modem is connected to 4-wire leased line	Off	Off	On
Modem is connected to 2-wire leased line. After 6 seconds of receiving no input, the modem goes off-hook and attempts to connect.	On	Off	On
Modem is connected to 4-wire leased line. After 6 seconds of receiving no input, the modem goes off-hook and attempts to connect.	On	On	Off

CONNECT SPEED SELECTION
Setting	SW2/1	SW2/2
Modem will connect at 14.4Kbps	On	On
Modem will connect at 9600bps	On	Off
Modem will connect at 4800bps	Off	On
Modem will connect at 2400bps	Off	Off

CD, CTS, DSR, AND RTS SIGNAL CONFIGURATION
Setting	SW2/4	SW2/5	SW2/6
CD, CTS, and DSR forced high	On	On	On
CD, CTS, and DSR normal	On	On	Off
CD, CTS, and DSR forced high except at disconnect	On	Off	On
CD normal, CTS and DSR forced high	On	Off	Off
CD, CTS, and DSR normal	Off	On	On
CD normal, CTS follows RTS, DSR forced high	Off	On	Off
CD and CTS use ITU-T V.13 to simulate half-duplex modes, DSR normal	Off	Off	On
CD and CTS use ITU-T V.13 to simulate half-duplex modes, DSR forced high	Off	Off	Off

DIAGNOSTIC LED(S) (POWER-UP)
TST	OH	HS	Condition
On	Off	Off	Firmware checksum incorrect
On	Off	Red	RAM test failed
On	Off	Green	Modem failed
On	On	N/A	Modem failed
Off	Off	Off	All tests passed

DIAGNOSTIC LED(S) (NORMAL OPERATION)
LED	Color	Status	Condition
PWR	Unidentified	On	Power is on
PWR	Unidentified	Off	Power is off
TST	Unidentified	On	System error has occurred or modem is retraining
TST	Unidentified	Blinking	Serial port is waiting to be configured
TST	Unidentified	One blink	Data error has occurred
TST	Unidentified	Off	Normal operation
OH	Unidentified	On	Modem is off-hook
OH	Unidentified	Off	Modem is on-hook
HS	Red	On	Modem is connected at, or serial port speed is set to, 300bps
HS	Red	1 blink	Modem is connected at, or serial port speed is set to, 600bps
HS	Red	2 blinks	Modem is connected at, or serial port speed is set to, 1200bps
HS	Red	3 blinks	Modem is connected at, or serial port speed is set to, 2400bps
HS	Green	On	Modem is connected at, or serial port speed is set to, 4800bps
HS	Green	1 blink	Modem is connected at, or serial port speed is set to, 7200bps
HS	Green	2 blinks	Modem is connected at, or serial port speed is set to, 9600bps
HS	Green	3 blinks	Modem is connected at, or serial port speed is set to, 12Kbps
HS	Green	4 blinks	Modem is connected at, or serial port speed is set to, 14.4Kbps
HS	N/A	Off	Modem is connected at, or serial port speed is set to, 75bps
DTR	Unidentified	On	DTR signal is high
DTR	Unidentified	Off	DTR signal is low
TXD	Unidentified	Blinking	Modem is transmitting data
TXD	Unidentified	Off	Modem is not transmitting data
RXD	Unidentified	Blinking	Modem is receiving data
RXD	Unidentified	Off	Modem is not receiving data

SUPPORTED STANDARD COMMANDS

Basic AT Commands

+++, ‘comma’, A/

A, B, E, H, I, L, M, O, P, Q, T, V, W, X, Y, Z

&D, &F, &G, &M, &P, &T, &W, &X, &Y, &Z

Extended AT Commands

\A, \B, \C, \E, \J, \N, \Q, \T

%A, %C, %E, %F, %G

Special AT Commands

-J, *H, )M, @M, :E

S-Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S12, S14, S16, S18, S22, S23, S25, S26, S27

Note: See MHI documentation for complete information.

COMMAND SET - V.25bis
Type:	Immediate
Format:	[cmds] \M
Description:	Enables the V.25bis command set.

DISPLAY SWITCH SETTINGS
Type:	Immediate
Format:	AT [cmds] %Sn [cmds]
Description:	Displays the modem’s switch settings.
Command		Function
%S0		Display settings of SW1/1-SW1/10.
%S1		Display settings of SW2/1-SW2/8.
%S2		Display settings of SW3/1-SW3/8.

LEASED LINE CALL RESTORAL
Type:	Configuration
Format:	AT [cmds] )Pn [cmds]
Description:	Selects whether the modem will attempt to reconnect with a dial backup call to a leased line MNP reliable mode connection that has terminated abnormally. If the dial backup reconnects successfully, the call will proceed as if it had not disconnected.
Command		Function
)P0		Leased line call restoral disabled.
í )P1		Leased line call restoral enabled.

LEASED LINE COMPROMISE EQUALIZER
Type:	Configuration
Format:	AT [cmds] )En [cmds]
Description:	Selects whether the compromise equalizer will be used for leased line V.32 and V.32bis connections.
Command		Function
í )E0		Compromise equalizer disabled.
)E1		Compromise equalizer enabled.

LEASED LINE DIAL BACKUP
Type:	Configuration
Format:	AT [cmds] :Nn [cmds]
Description:	Selects whether the modem will attempt to connect to the first stored number with a switched line connection if the leased line connection fails.
Command		Function
:N0		Dial backup disabled.
í :N1		Dial backup enabled.

LEASED LINE DIAL BACKUP IN ANSWER MODE
Type:	Configuration
Format:	AT [cmds] )Cn [cmds]
Description:	Selects whether the modem is allowed to execute a dial backup if it is in answer mode.
Command		Function
)C0		Dial backup disabled in answer mode.
í )C1		Dial backup enabled in answer mode.

LEASED LINE MAXIMUM RETRAIN COUNTER
Type:	Configuration
Format:	AT [cmds] :Gn [cmds]
Description:	Sets the number of times the modem is allowed to retrain in the time specified by the :H command before it attempts a dial backup connection.

LEASED LINE MAXIMUM RETRAIN TIME
Type:	Configuration
Format:	AT [cmds] :Hn [cmds]
Default:	0
Range:	0 - 255
Unit:	1 minute
Description:	Sets the amount of time in which the modem is allowed to retrain the number of times specified by the :G command before it attempts a dial backup connection.

LEASED LINE ORIGINATE MODE TIMER
Type:	Configuration
Format:	AT [cmds] &Vn [cmds]
Default:	5
Range:	0 - 90
Unit:	1 minute
Description:	Sets the amount of time that the originating modem waits for an answer before attempting a dial backup.

LEASED LINE QUALITY
Type:	Immediate
Format:	AT [cmds] )F [cmds]
Default:	N/A
Range:	0 - 65535
Unit:	N/A
Description:	Displays the poorest quality of the phone line this connection. Higher numbers indicate a poorer connection.

LEASED LINE QUALITY CLEAR
Type:	Configuration
Format:	AT [cmds] :Y [cmds]
Description:	Clears the line quality value reported by )F so that the current line quality may be monitored.

LEASED LINE RESTORAL
Type:	Configuration
Format:	AT [cmds] )Ln [cmds]
Description:	Selects whether the modem will attempt to restore a leased line connection while connected with a dial backup connection.
Command		Function
)L0		Modem will not attempt to restore leased line connection.
í )L1		Modem will attempt to restore leased line connection.

LEASED LINE RESTORAL CARRIER TIMER
Type:	Configuration
Format:	AT [cmds] )Wn [cmds]
Default:	20
Range:	0 - 255
Unit:	1 second
Description:	Sets the amount of time that the modem waits for a carrier after attempting to restore a leased line connection. If this time expires the modem will begin a dial backup again.

LEASED LINE RESTORAL DELAY
Type:	Configuration
Format:	AT [cmds] )Xn [cmds]
Default:	60
Range:	0 - 60
Unit:	1 minute
Description:	Sets the amount of time that the modem waits after a successful dial backup to check the leased line to see if service has been re-established.

LEASED LINE RESTORAL RETRY DELAY
Type:	Configuration
Format:	AT [cmds] )Yn [cmds]
Default:	40
Range:	0 - 255
Unit:	1 second
Description:	Sets the amount of time after a failed attempt to re-connect to the leased line, and while it is performing a dial backup, that the modem watches for a carrier on the leased line. If no carrier is detected within this time the modem proceeds with the dial backup.

LEASED LINE RESTORE
Type:	Immediate
Format:	AT [cmds] )B [cmds]
Description:	Initiates a leased line restoral.

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Description:	Selects what type of line the modem is connected to and whether it will attempt to automatically re-connect.
Command		Function
í &L0		Modem is connected to switched line.
&L1		Modem is connected to 2-wire leased line.
&L2		Modem is connected to 4-wire leased line.
&L3		Modem is connected to 2-wire leased line. After 6 seconds of receiving no input, the modem goes off-hook and attempts to connect.
&L4		Modem is connected to 4-wire leased line. After 6 seconds of receiving no input, the modem goes off-hook and attempts to connect.

OPERATING MODE
Type:	Configuration
Format:	AT [cmds] $Sn [cmds]
Description:	Selects whether the modem will operate in asynchronous or synchronous mode.
Command		Function
í $S0		Determined by SW1/9.
$S1		Force asynchronous mode.
$S2		Force synchronous mode.

COMMAND SET - AT
Type:	Immediate
Format:	ATZ
Description:	Enables the AT command set.

CONNECTION SECURITY - PASSWORD SELECTION (ASYNCHRONOUS MODE)
Type:	Configuration
Format:	PSW
Description:	Changes the connection password. The user will be prompted to enter the old and new passwords. Passwords must be exactly five characters, case insensitive.

CONNECTION SECURITY - PASSWORD SELECTION (SYNCHRONOUS MODE)
Type:	Configuration
Format:	PSWxxxxx;yyyyy
Description:	Changes the connection password. The xxxxx represents old connection password, and the yyyyy is the new connection password. Passwords must be exactly five characters, case insensitive.