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# MAXTECH CORPORATION
MAXTECH 9424H
Card Type Modem(asynchronous)
Chip Set Unidentified
Maximum Data Rate 2400bps
Maximum Fax Rate 9600bps
Data Bus 8 bit ISA
Fax Class Class I
Data Modulation Protocol Bell 103A/212A
ITU-T V.21, V.22, V.22bis
Fax Modulation Protocol ITU-T V.21CH2, V.27ter, V.29
Error Correction/Compression MNP5, V.42, V.42bis
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line in | CN1 | Line out | CN2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT ADDRESS |
|------------------------------------------------------------|
| Setting | J1 | J2 |
|------------------+--------------------+--------------------|
| COM1 (3F8h) | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| COM2 (2F8h) | Pins 2 &3 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| COM3 (3E8h) | Pins 1 & 2 closed | Pins 2 &3 closed |
|------------------+--------------------+--------------------|
| COM4 (2E8h) | Pins 2 &3 closed | Pins 2 &3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT |
|------------------------------------------------------------|
| Setting | J3 | J4 | J5 | J6 |
|------------+-----------+-----------+-----------+-----------|
| 2 | On | Off | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 3 | Off | On | Off | Off |
|------------+-----------+-----------+-----------+-----------|
| 4 | Off | Off | On | Off |
|------------+-----------+-----------+-----------+-----------|
| 5 | Off | Off | Off | On |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S14 |
|------------------------------------------------------------|
| Format | AT [cmds] S14=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 170 |
|--------------+---------------------------------------------|
| Range: | 0 - 174 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls command echo, result codes, |
| | dialing mode, and answer/originate mode |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | 0 | Not used |
|------+-------+---------------------------------------------|
| 1 | 0 | Command echo off |
| | | |
| | í 1 | Command echo on |
|------+-------+---------------------------------------------|
| 2 | í 0 | Result codes enabled |
| | | |
| | 1 | Result codes disabled |
|------+-------+---------------------------------------------|
| 3 | 0 | Numeric result codes |
| | | |
| | í 1 | Verbose result codes |
|------+-------+---------------------------------------------|
| 4 | 0 | Not used |
|------+-------+---------------------------------------------|
| 5 | 0 | Tone dialing selected |
| | | |
| | í 1 | Pulse dialing selected |
|------+-------+---------------------------------------------|
| 6 | 0 | Not used |
|------+-------+---------------------------------------------|
| 7 | 0 | Answer mode selected |
| | | |
| | í 1 | Originate mode selected |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S21 |
|------------------------------------------------------------|
| Format | AT [cmds] S21=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 249 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Selects jack type, low DTR action, DCD |
| | signal, DSR signal, and the Long Space |
| | Disconnect function |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | Selects RJ-11jack |
| | | |
| | 1 | Selects RJ-12 or RJ-13 jack |
|------+-------+---------------------------------------------|
| 1 | 0 | Not used |
|------+-------+---------------------------------------------|
| 2 | 0 | Not used |
|------+-------+---------------------------------------------|
| 4, 3 | í 00 | DTR signal ignored |
| | | |
| | 01 | Modem goes to command mode on low DTR |
| | | |
| | 10 | Modem disconnects on low DTR |
| | | |
| | 11 | Modem is initialized on low DTR |
|------+-------+---------------------------------------------|
| 5 | í 0 | DCD forced high |
| | | |
| | 1 | DCD normal |
|------+-------+---------------------------------------------|
| 6 | í 0 | DSR forced high |
| | | |
| | 1 | DSR normal |
|------+-------+---------------------------------------------|
| 7 | í 0 | Long Space Disconnect function disabled |
| | | |
| | 1 | Long Space Disconnect function enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S22 |
|------------------------------------------------------------|
| Format | AT [cmds] S22=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 118 |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls volume and speaker settings, |
| | result codes, and make/break pulse ratio |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 1, 0 | 00 | Not used |
| | | |
| | í 01 | Low volume setting |
| | | |
| | 10 | Medium volume setting |
| | | |
| | 11 | Highest volume setting |
|------+-------+---------------------------------------------|
| 3, 2 | 00 | Speaker disabled |
| | | |
| | í 01 | Speaker enabled until carrier signal |
| | | detected |
| | 10 | |
| | | Speaker enabled |
| | 11 | |
| | | Speaker off during dialing |
|------+-------+---------------------------------------------|
| 6, 5 | 000 | Busy and dialtone detection disabled, |
| ,4 | | result codes 0-4 enabled |
| | 001 | |
| | | Not used |
| | 010 | |
| | | Not used |
| | 011 | |
| | | Not used |
| | 100 | |
| | | Busy and dialtone detection disabled, |
| | 101 | result codes 0-5, 10 enabled |
| | | |
| | 110 | Busy tone detection disabled, dialtone |
| | | detection enabled, result codes 0-6, 10 |
| | í 111 | enabled |
| | | |
| | | Busy tone detection enabled, dialtone |
| | | detection disabled, result codes 0-5, 7, 10 |
| | | enabled |
| | | |
| | | Busy and dialtone detection enabled, all |
| | | result codes enabled |
|------+-------+---------------------------------------------|
| 7 | í 0 | 39/61ms at 10pps (North America) |
| | | |
| | 1 | 33/67ms at 10pps (Europe) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S23 |
|------------------------------------------------------------|
| Format | AT [cmds] S23=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 7 |
|--------------+---------------------------------------------|
| Range: | 0-247 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Grants/denies remote digital loopback, |
| | connect speed, parity and guard tone |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | 0 | Remote digital loopback denied |
| | | |
| | í 1 | Remote digital loopback allowed |
|------+-------+---------------------------------------------|
| 2, 1 | 00 | Connect at 0-300bps |
| | | |
| | 01 | Not used |
| | | |
| | 10 | Connect at 1200bps |
| | | |
| | í 11 | Connect at 2400bps |
|------+-------+---------------------------------------------|
| 3 | 0 | Not used |
|------+-------+---------------------------------------------|
| 5,4 | í 00 | Parity even |
| | | |
| | 01 | Space parity |
| | | |
| | 10 | Parity odd |
| | | |
| | 11 | No Parity |
|------+-------+---------------------------------------------|
| 7, 6 | í 00 | Guard tone disabled |
| | | |
| | 01 | Guard tone 550Hz enabled |
| | | |
| | 10 | Guard tone 1800Hz enabled |
| | | |
| | 11 | Not used |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S27 |
|------------------------------------------------------------|
| Format: | AT [cmds] S27=n [cmds] |
|-----------------+------------------------------------------|
| Default: | 64 |
|-----------------+------------------------------------------|
| Range: | 0-127 |
|-----------------+------------------------------------------|
| Description: | Asynchronous operation, leased/switched |
| | line, ITU-U/Bell operation |
|------------------------------------------------------------|
| Bit | Value | Function |
|----------+-----------+-------------------------------------|
| 3, 1, 0 | í 0x00 | Asynchronous operation |
|------------------------------------------------------------|
| 2 | í 0 | Switched line |
| | | |
| | 1 | Leased line |
|--------------+-----------+---------------------------------|
| 4 | 0 | Not used |
|--------------+-----------+---------------------------------|
| 5 | 0 | Not used |
|--------------+-----------+---------------------------------|
| 6 | 0 | V.21/V.22 |
| | | |
| | í 1 | Bell 212A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TEST STATUS |
|------------------------------------------------------------|
| Format | AT [cmds] S16=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 122 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Contains status of loopback tests |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | í 0 | Local analog loopback test disabled |
| | | |
| | 1 | Local analog loopback test enabled |
|------+-------+---------------------------------------------|
| 1 | 0 | Not used |
|------+-------+---------------------------------------------|
| 2 | í 0 | Local digital loopback test disabled |
| | | |
| | 1 | Local digital loopback test enabled |
|------+-------+---------------------------------------------|
| 3 | í 0 | Remote digital loopback test disabled |
| | | |
| | 1 | Remote digital loopback test enabled |
|------+-------+---------------------------------------------|
| 4 | í 0 | Remote digital loopback test not in |
| | | progress |
| | 1 | |
| | | Remote digital loopback test in progress |
|------+-------+---------------------------------------------|
| 5 | í 0 | Remote digital loopback test with test and |
| | | error disabled |
| | 1 | |
| | | Remote digital loopback test with test and |
| | | error enabled |
|------+-------+---------------------------------------------|
| 6 | í 0 | Local digital loopback test with self test |
| | | disabled |
| | 1 | |
| | | Local digital loopback test with self test |
| | | enabled |
+------------------------------------------------------------+