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       # PRACTICAL PERIPHERALS, INC.
       
          PC PCMCIA 144, PC PCMCIA 144 EZ-PORT
       
          Card Type              Modem (asynchronous)                    
          Chip Set               Unidentified                            
          Maximum Modem Rate     14.4Kbps                                
          Maximum Fax Rate       14.4Kbps                                
          Data Modulation        Bell 103/212A                           
          Protocol                                                       
                                 ITU-T V.21, V.22, V.22bis, V.32,        
                                 V.32bis                                 
          Fax Modulation         ITU-T V.17, V.27ter, V.29               
          Protocol               
          Error                  MNP5, V.42, V.42bis                     
          Correction/Compression 
          Fax Class              Class I & II                            
          Data Bus               PCMCIA                                  
       
                                                                   54796
       
          +------------------------------------------------------------+
          |                   SUPPORTED COMMAND SET                    |
          |------------------------------------------------------------|
          |                     Basic AT Commands                      |
          |------------------------------------------------------------|
          | AT, ‘+++’, A/                                              |
          |------------------------------------------------------------|
          | A, D, E, F, H, M, V, W, X, Y, Z                            |
          |------------------------------------------------------------|
          | &A, &V, &W, &Y, &Z                                         |
          |------------------------------------------------------------|
          |                        S Registers                         |
          |------------------------------------------------------------|
          | S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12,     |
          | S18, S25, S30, S36, S37,                                   |
          |------------------------------------------------------------|
          | S38, S46, S48, S82, S86, S95, S99, S108, S109, S110, 201   |
          |------------------------------------------------------------|
          | Note: See MHI Help File for full command documentation.    |
          +------------------------------------------------------------+
       
                            Proprietary AT Command Set
       
          +------------------------------------------------------------+
          |                    AUTO-MODE DETECTION                     |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Nn [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Selects various options for the automatic   |
          |              | detection and negotiation of protocols      |
          |              | during the handshake process if the modem   |
          |              | is communicating with a remote modem of     |
          |              | dissimilar speed.                           |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      N0      | Originate or answer: handshake only at      |
          |              | speed in S37                                |
          |--------------+---------------------------------------------|
          |     í N1     | Negotiate highest common speed starting in  |
          |              | S37                                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      CODE MODULATION                       |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Un                               |
          |--------------+---------------------------------------------|
          | Description: | Control trellis code modulation             |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     &U0      | Trellis coding enabled                      |
          |--------------+---------------------------------------------|
          |     &U1      | Trellis coding disabled                     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    COMMUNICATIONS MODE                     |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Qn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects communications mode options         |
          |--------------+---------------------------------------------|
          |   Command    |                    Mode                     |
          |--------------+---------------------------------------------|
          |    í &Q0     | Asynchronous mode                           |
          |--------------+---------------------------------------------|
          |     &Q4      | Auto-synchronous mode                       |
          |--------------+---------------------------------------------|
          |     &Q5      | Error correction mode                       |
          |--------------+---------------------------------------------|
          |     &Q6      | Buffered asynchronous mode                  |
          |--------------+---------------------------------------------|
          |     &Q8      | MNP mode                                    |
          |--------------+---------------------------------------------|
          |     &Q9      | V.42bis data compression enabled, MNP5      |
          |              | disabled                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  COMMUNICATION PROTOCOLS                   |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Bn [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Selects the communication protocol for data |
          |              | calls                                       |
          |------------------------------------------------------------|
          |      Note: The B command allows the simultaneous selection |
          |      of more than one suffix, enabling multiple protocols. |
          |------------------------------------------------------------|
          |   Command    |                  Protocol                   |
          |--------------+---------------------------------------------|
          |      B0      | ITU-T V.22 at 300 or 1200bps                |
          |--------------+---------------------------------------------|
          |      B1      | Bell 212A at 300 or 1200bps                 |
          |--------------+---------------------------------------------|
          |     B15      | ITU-T V.21 at 300bps                        |
          |--------------+---------------------------------------------|
          |     B16      | Bell 103 at 300bps                          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 DATA CARRIER DETECT (DCD)                  |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Cn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects whether the DCD option is enabled   |
          |              | or disabled                                 |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    í &C0     | DCD enabled                                 |
          |--------------+---------------------------------------------|
          |     &C1      | DCD enabled after carrier signal detected   |
          |--------------+---------------------------------------------|
          |     &C2      | DCD on except during disconnect             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 DATA TERMINAL READY (DTR)                  |
          |------------------------------------------------------------|
          | Type:         | Configuration                              |
          |---------------+--------------------------------------------|
          | Format:       | AT [cmds] &Dn [cmds]                       |
          |---------------+--------------------------------------------|
          | Description:  | Selects modem response to DTR              |
          |------------------------------------------------------------|
          |      Note: The action each variant of &D causes depends on |
          |      the setting of &Q                                     |
          |------------------------------------------------------------|
          |    Command    |                  Function                  |
          |---------------+--------------------------------------------|
          |     í &D0     | Modem does not respond to DTR              |
          |---------------+--------------------------------------------|
          |      &D1      | Modem goes to command mode after DTR goes  |
          |               | is off                                     |
          |---------------+--------------------------------------------|
          |      &D2      | Modem goes to command mode and disconnects |
          |               | (hangs up) after DTR goes off; Auto-Answer |
          |               | is disabled.                               |
          |---------------+--------------------------------------------|
          |      &D3      | Modem is initialized after DTR goes off    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        DIAL UP MODE                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Ln [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Sets the dial up mode                       |
          |--------------+---------------------------------------------|
          |   Command    |                  Line Type                  |
          |--------------+---------------------------------------------|
          |    í &L0     | Select dial up mode                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    DATA SET READY (DSR)                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Sn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects DSR options                         |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     &S0      | DSR forced high                             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  FACTORY DEFAULT PROFILE                   |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &F [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Sets values in active profile to values     |
          |              | found in the default profile                |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    í &F0     | Hays-compatible settings                    |
          |--------------+---------------------------------------------|
          |     &F1      | IBM-compatible settings                     |
          |--------------+---------------------------------------------|
          |     &F2      | Macintosh software handshake settings       |
          |--------------+---------------------------------------------|
          |     &F3      | Macintosh hardware handshake settings       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        FLOW CONTROL                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Kn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Enables flow control options                |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     &K0      | Flow control disabled                       |
          |--------------+---------------------------------------------|
          |     &K1      | RTS to CTS flow control enabled             |
          |--------------+---------------------------------------------|
          |     &K2      | XON/XOFF flow control enabled               |
          |--------------+---------------------------------------------|
          |    í &K3     | RTS/CTS flow control enabled                |
          |--------------+---------------------------------------------|
          |     &K4      | XON/XOFF flow control enabled               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         GUARD TONE                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Gn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Commands the modem to transmit a guard tone |
          |              | in V.22/V.22bis                             |
          |------------------------------------------------------------|
          |      Note: Used primarily for international data           |
          |      transmission                                          |
          |------------------------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    í &G0     | Guard tone disabled                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                            HELP                            |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] $Hn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Displays the help templates for the $       |
          |              | commands                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                          ON-LINE                           |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] On [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Controls on-line command (data              |
          |              | transmission) state options.                |
          |------------------------------------------------------------|
          |      Note: The O command must be placed at the end of the  |
          |      command string.                                       |
          |------------------------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      O0      | On-line command mode with no retraining     |
          |              | enabled                                     |
          |--------------+---------------------------------------------|
          |      O1      | On-line command mode with retraining        |
          |              | enabled                                     |
          |--------------+---------------------------------------------|
          |      O3      | On-line command mode with rate negotiation  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     REPORT INFORMATION                     |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] In [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Displays information requested              |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      I0      | Reports modem product code                  |
          |--------------+---------------------------------------------|
          |      I1      | Reports ROM checksum                        |
          |--------------+---------------------------------------------|
          |      I2      | Reports OK or ERROR                         |
          |--------------+---------------------------------------------|
          |      I3      | Reports modem firmware revision number      |
          |--------------+---------------------------------------------|
          |      I4      | Reports a number series representing        |
          |              | feature bit map                             |
          |--------------+---------------------------------------------|
          |      I6      | Reports data connection information         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        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                |
          |--------------+---------------------------------------------|
          |      Q2      | Result code sending in originate mode only  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       SPEAKER VOLUME                       |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Ln [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Command is included for compatibility only, |
          |              | it performs no function.                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    V.32 - AUTO-RETRAIN                     |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Bn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Controls auto-retrain function if poor line |
          |              | quality is detected                         |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    í &B0     | Auto-retrain disabled modem hangs-up        |
          |--------------+---------------------------------------------|
          |     &B1      | Auto-retrain enabled if line quality is     |
          |              | poor                                        |
          |--------------+---------------------------------------------|
          |     &B2      | Auto-retrain enabled disconnect if no line  |
          |              | improvement over period indicated in S7     |
          +------------------------------------------------------------+
       
                               S(status) -REGISTERS
       
          +------------------------------------------------------------+
          |                         DCE SPEED                          |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S43=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Description: | Displays the current DCE speed              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       DCE LINE SPEED                       |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S37=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Description: | Sets the maximum allowable data exchange    |
          |              | rate attempted during handshake process.    |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S37=0    | Speed of last connection                    |
          |--------------+---------------------------------------------|
          |    S37=1     | 75bps                                       |
          |--------------+---------------------------------------------|
          |    S37=2     | 110bps                                      |
          |--------------+---------------------------------------------|
          |    S37=3     | 300bps                                      |
          |--------------+---------------------------------------------|
          |    S37=4     | 600bps                                      |
          |--------------+---------------------------------------------|
          |    S37=5     | 1200bps                                     |
          |--------------+---------------------------------------------|
          |    S37=6     | 2400bps                                     |
          |--------------+---------------------------------------------|
          |    S37=7     | 4800bps                                     |
          |--------------+---------------------------------------------|
          |    S37=8     | 7200bps                                     |
          |--------------+---------------------------------------------|
          |    S37=9     | 9600bps                                     |
          |--------------+---------------------------------------------|
          |    S37=10    | 12.0Kbps                                    |
          |--------------+---------------------------------------------|
          |    S37=11    | 14.4Kbps                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CIRCUIT CARRIER LEVEL                    |
          |------------------------------------------------------------|
          | Type:                         | Register                   |
          |------------------------------------------------------------|
          | Format:      | AT [cmds] S63=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Range:       | 0-15dBm                                     |
          |--------------+---------------------------------------------|
          | Description: | Private circuit carrier level selection     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 AUTOMODE AND PROBE TIMING                  |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S97=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Default:     | 30                                          |
          |--------------+---------------------------------------------|
          | Range:       | 15-70                                       |
          |--------------+---------------------------------------------|
          | Unit:        | 0.1 seconds                                 |
          |--------------+---------------------------------------------|
          | Description: | V.32 Automode. V.22/V.22bis Probe Timing    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      DISTINCTIVE RING                      |
          |------------------------------------------------------------|
          | Type:        | bit map                                     |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S101=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Default:     | 00                                          |
          |--------------+---------------------------------------------|
          | Range:       | 0-255                                       |
          |--------------+---------------------------------------------|
          | Unit:        | bit map                                     |
          |--------------+---------------------------------------------|
          | Description: | Selects distinctive ring setting            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        PACKET SIZE                         |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S136=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Default:     | 1                                           |
          |--------------+---------------------------------------------|
          | Range:       | 0-2                                         |
          |--------------+---------------------------------------------|
          | Description: | Selects LAPM packet size                    |
          +------------------------------------------------------------+