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# ZOOM TELEPHONICS, INC.
COMSTAR 28800
Card Type Fax, Modem (asynchronous), Voice
Chip Set Unidentified
I/O Options Speakerphone, Voice mail
Maximum Data Rate 28.8Kbps
Maximum Fax Rate 14.4Kbps
Data Bus 8-bit ISA
Fax Class Class I & II
Data Modulation Bell 103/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.23, V.32,
V.32bis, V.34
Fax Modulation ITU-T V.17, V.21CH2, V.27ter, V.29,
Protocol V.33
Error MNP10, V.42bis
Correction/Compression
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line out | CN1 | Microphone | CN3 |
|-----------------------------+----------+------------+------|
| Line in | CN2 | Speaker | CN4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------------+-------+-----------|
| í Electret microphone | JP1 | Pins 1 & |
| | | 2 closed |
|----------------------------------------+-------+-----------|
| Plantronics headset | JP1 | Pins 2 & |
| | | 3 closed |
|----------------------------------------+-------+-----------|
| Dynamic microphone | JP1 | Open |
|----------------------------------------+-------+-----------|
| í Unpowered speaker, volume medium | JP2 | Closed |
| level | | |
|----------------------------------------+-------+-----------|
| Powered speaker, volume low level | JP2 | Open |
|----------------------------------------+-------+-----------|
| Volume high level | JP2 | Closed |
|----------------------------------------+-------+-----------|
| í Unpowered speaker, volume medium | JP3 | Closed |
| level | | |
|----------------------------------------+-------+-----------|
| Powered speaker, volume low level | JP3 | Open |
|----------------------------------------+-------+-----------|
| Volume high level | JP3 | Open |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| AUTO-RETRAIN - AUTO-FALLBACK/FALL-FORWARD |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %En [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls auto-retrain mode and |
| | auto-fallback/fall-forward |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %E0 | Auto-retrain disabled |
|--------------+---------------------------------------------|
| %E1 | Auto-retrain enabled |
|--------------+---------------------------------------------|
| í %E2 | Auto-fallback/fall-forward enabled |
|--------------+---------------------------------------------|
| %E3 | Auto-retrain enabled with fast hang-up |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT MAPPED REGISTERS |
|------------------------------------------------------------|
| Register | Default |
|----------------------------+-------------------------------|
| S14 | Unidentified |
|----------------------------+-------------------------------|
| S16 | Unidentified |
|----------------------------+-------------------------------|
| S21 | Unidentified |
|----------------------------+-------------------------------|
| S22 | Unidentified |
|----------------------------+-------------------------------|
| S23 | Unidentified |
|----------------------------+-------------------------------|
| S27 | Unidentified |
|----------------------------+-------------------------------|
| S28 | Unidentified |
|----------------------------+-------------------------------|
| S31 | Unidentified |
|----------------------------+-------------------------------|
| S40 | Unidentified |
|----------------------------+-------------------------------|
| S41 | Unidentified |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK SEND |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Bn [cmds] |
|--------------+---------------------------------------------|
| Default: | 3 |
|--------------+---------------------------------------------|
| Range: | 1-9 |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | Sends break to modem |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BREAK TYPE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Configures action of break signal |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CALLER ID |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #CID=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the Caller ID function |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| #CID=0 | Caller ID disabled |
|--------------+---------------------------------------------|
| #CID=1 | Caller ID enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMPRESSION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Cn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects data compression |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %C0 | Data compression disabled |
|--------------+---------------------------------------------|
| %C1 | MNP5 enabled |
|--------------+---------------------------------------------|
| %C2 | V.42bis enabled |
|--------------+---------------------------------------------|
| í %C3 | MNP5 and V.42bis enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECT MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Nn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the type of connection the modem |
| | will operate in |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \N0 | Normal mode enabled |
|--------------+---------------------------------------------|
| \N1 | Direct mode enabled |
|--------------+---------------------------------------------|
| \N2 | Reliable mode enabled |
|--------------+---------------------------------------------|
| í \N3 | Auto-reliable mode enabled |
|--------------+---------------------------------------------|
| \N4 | LAP-M error correcting only enabled |
|--------------+---------------------------------------------|
| \N5 | MNP error correcting only enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] D<#> [cmds] |
|--------------+---------------------------------------------|
| Description: | Dials telephone number according to any |
| | modifiers included in the string |
|--------------+---------------------------------------------|
| Modifier | Function |
|--------------+---------------------------------------------|
| L | Redials last number |
|--------------+---------------------------------------------|
| P | Pulse dialing enabled |
|--------------+---------------------------------------------|
| T | Tone dialing enabled |
|--------------+---------------------------------------------|
| W | Dialing resumed following dial tone |
| | detection |
|--------------+---------------------------------------------|
| , | Dialing paused for amount of time specified |
| | in S8 register |
|--------------+---------------------------------------------|
| @ | Modem waits for a ring-back signal followed |
| | by silence up to 5 second prior to |
| | executing the rest of the dial string. |
|--------------+---------------------------------------------|
| R | Command recognized and not initiated |
|--------------+---------------------------------------------|
| ; | Modem returned to command mode after |
| | dialing. |
|--------------+---------------------------------------------|
| ! | Flash function initiated. Goes on-hook for |
| | amount of time specified in S29 register |
|--------------+---------------------------------------------|
| S=(0-3) | Number in memory location &Zn dialed |
|--------------+---------------------------------------------|
| ^ | Calling tone enabled, data mode only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH DIAL MODIFIER TIME |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S29=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 70 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | .01 second |
|--------------+---------------------------------------------|
| Description: | Time the modem will go on-hook upon |
| | receiving the ! dial modifier in dial |
| | string. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Gn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects modem port flow control |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \G0 | Flow control disabled |
|--------------+---------------------------------------------|
| \G1 | Flow control enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S39=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Select the type of flow control used |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| S39=0 | Flow control disabled |
|---------------+--------------------------------------------|
| í S39=3 | Hardware flow control enabled |
|---------------+--------------------------------------------|
| S39=4 | Software flow control enabled |
|---------------+--------------------------------------------|
| S39=5 | Transparent software flow control enabled |
|---------------+--------------------------------------------|
| S39=6 | Both hardware and software flow control |
| | enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL CHARACTER - XOFF |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S33=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 19 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| Description: | Sets the character used to represent XOFF |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL CHARACTER - XON |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S32=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 17 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| Description: | Sets the character used to represent XON |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LINE SIGNAL LEVEL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %L [cmds] |
|--------------+---------------------------------------------|
| Description: | Returns a value which indicates the |
| | received line signal level (-dBm) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LINE SIGNAL QUALITY |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Q [cmds] |
|--------------+---------------------------------------------|
| Description: | Returns a value which indicates line signal |
| | quality |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MAXIMUM BLOCK SIZE FOR TRANSMISSION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \An [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the maximum transmittable block size |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \A0 | MNP block size is 64 characters |
|--------------+---------------------------------------------|
| í \A1 | MNP block size is 128 characters |
|--------------+---------------------------------------------|
| \A2 | MNP block size is 192 characters |
|--------------+---------------------------------------------|
| \A3 | MNP block size is 256 characters |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP - STREAM/BLOCK MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Ln [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the transfer mode for MNP link |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í \L0 | Stream mode for MNP enabled |
|--------------+---------------------------------------------|
| \L1 | Block mode for MNP enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 - EXTENDED SERVICES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects MNP10 extended services |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í -K0 | MNP10 disabled |
|--------------+---------------------------------------------|
| -K1 | MNP10 enabled |
|--------------+---------------------------------------------|
| -K2 | MNP10 enabled on originate mode only |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 - FALLBACK |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Allows MNP10 to fall back to 2400bps |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| -Q0 | MNP10 at 2400 disabled |
|--------------+---------------------------------------------|
| í -Q1 | MNP10 at 2400 enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 - LINK NEGOTIATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *Hn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the speed at which MNP10 link |
| | negotiation will occur |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í *H0 | Link will be negotiated at highest possible |
| | speed |
|--------------+---------------------------------------------|
| *H1 | Link will be negotiated at 1200bps |
|--------------+---------------------------------------------|
| *H2 | Link will be negotiated at 4800bps |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 - POWER LEVEL ADJUST |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] )Mn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls automatic transmit power level |
| | adjustment during MNP 10 link negotiation |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í )M0 | Power level adjustment disabled |
|--------------+---------------------------------------------|
| )M1 | Power level adjustment enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MODULATION SELECTION DISPLAY |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] +MS? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays modulation, automode, minimum rate |
| | and maximum rate settings |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MODULATION SELECTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] +MS=x,y,z,a [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets options for active protocol; the |
| | transfer rates specified by z and a must be |
| | valid for the protocol selected. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| x=0 | V.21 |
|--------------+---------------------------------------------|
| x=1 | V.22 |
|--------------+---------------------------------------------|
| x=2 | V.22bis |
|--------------+---------------------------------------------|
| x=3 | V.23 |
|--------------+---------------------------------------------|
| x=9 | V.32 |
|--------------+---------------------------------------------|
| x=10 | V.32bis |
|--------------+---------------------------------------------|
| í x=11 | V.34 |
|--------------+---------------------------------------------|
| x=64 | Bell 103 |
|--------------+---------------------------------------------|
| x=69 | Bell 212A |
|--------------+---------------------------------------------|
| x=74 | V.FC |
|--------------+---------------------------------------------|
| y=0 | Automode disabled |
|--------------+---------------------------------------------|
| í y=1 | Auto-detect highest speed enabled |
|--------------+---------------------------------------------|
| z, a=300 | Set minimum or maximum transfer rate at |
| | 300bps, respectively. |
|--------------+---------------------------------------------|
| z, a=1200 | Set minimum or maximum transfer rate at |
| | 1200bps, respectively. |
|--------------+---------------------------------------------|
| z, a=2400 | Set minimum or maximum transfer rate at |
| | 2400bps, respectively. |
|--------------+---------------------------------------------|
| z, a=4800 | Set minimum or maximum transfer rate at |
| | 4800bps, respectively. |
|--------------+---------------------------------------------|
| z, a=7200 | Set minimum or maximum transfer rate at |
| | 7200bps, respectively. |
|--------------+---------------------------------------------|
| z, a=9600 | Set minimum or maximum transfer rate at |
| | 9600bps, respectively. |
|--------------+---------------------------------------------|
| z, a=12000 | Set minimum or maximum transfer rate at |
| | 12000bps, respectively. |
|--------------+---------------------------------------------|
| z, a=14400 | Set minimum or maximum transfer rate at |
| | 14400bps, respectively. |
|--------------+---------------------------------------------|
| z, a=16800 | Set minimum or maximum transfer rate at |
| | 16800bps, respectively. |
|--------------+---------------------------------------------|
| z, a=19200 | Set minimum or maximum transfer rate at |
| | 19200bps, respectively. |
|--------------+---------------------------------------------|
| z, a=21600 | Set minimum or maximum transfer rate at |
| | 21600bps, respectively. |
|--------------+---------------------------------------------|
| z, a=24000 | Set minimum or maximum transfer rate at |
| | 24000bps, respectively. |
|--------------+---------------------------------------------|
| z, a=26400 | Set minimum or maximum transfer rate at |
| | 26400bps, respectively. |
|--------------+---------------------------------------------|
| z, a=28800 | Set minimum or maximum transfer rate at |
| | 28800bps, respectively. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SLEEP TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S24=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Maximum duration of DTE and DCE inactivity |
| | allowed prior to initiating low-power sleep |
| | mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SPEAKERPHONE OPTIONS |
|------------------------------------------------------------|
| Type: | Immediate/Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] (see below) [cmds] |
|--------------+---------------------------------------------|
| Description: | Configures the modem to voice mode |
|------------------------------------------------------------|
| Command | Function |
|------------------+-----------------------------------------|
| #CLS=8 | Enable voice mode |
|------------------+-----------------------------------------|
| #VLS=6 | Enable speakerphone |
|------------------+-----------------------------------------|
| A | Answer in-coming call |
|------------------+-----------------------------------------|
| #VRN=0 | To originate a call, then AT<#><enter> |
|------------------+-----------------------------------------|
| HZ | Ends the call |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SPEAKERPHONE SETTINGS |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #SPK=x, y, z [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the speakerphone settings |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| x=0 | Microphone muted, speaker enabled |
|---------------+--------------------------------------------|
| í x=1 | Microphone and speaker enabled |
|---------------+--------------------------------------------|
| x=2 | Microphone on maximum and speaker disabled |
|---------------+--------------------------------------------|
| y=(0-16) | Speaker volume; increase the value lowers |
| | the volume. |
|---------------+--------------------------------------------|
| í Y=5 | Default setting |
|---------------+--------------------------------------------|
| Z=(0-3) | Microphone sensitivity; increase the value |
| | the microphone becomes more sensitive. |
|---------------+--------------------------------------------|
| í Z=1 | Default setting |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMISSION LEVEL - CELLULAR |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] @Mn [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 11-30 |
|--------------+---------------------------------------------|
| Unit: | -1 dBm |
|--------------+---------------------------------------------|
| Description: | Sets the signal level for transmission |
| | while in cellular mode |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| @M0 | -26 dBm |
|--------------+---------------------------------------------|
| @M1 | -30 dBm |
|--------------+---------------------------------------------|
| @M2-@M10 | -10 dBm |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.32 - COMPROMISE EQUALIZER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] :En [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls V.32 compromise equalizer |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| :E0 | Equalizer disabled |
|--------------+---------------------------------------------|
| í :E1 | Equalizer enabled |
+------------------------------------------------------------+