PRACTICAL PERIPHERALS, INC.
PM144HC II (VER. 2)
Card Type | Modem (asynchronous) |
Chipset | Unidentified |
Maximum Data Rate | 14.4Kbps |
Maximum Fax Rate | 14.4Kbps |
Data Bus | 8-bit ISA |
Fax Class | Class I & II |
Data Modulation | Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.32, V.32bis |
Fax Modulation | V.17, V.27ter, V.29 |
Error Correction/Compression | MNP5, V.42bis |

CONNECTIONS | |||
Function | Label | Function | Label |
Line in/out | CN1 | Line in/out | CN2 |
SERIAL PORT ADDRESS SELECTION | |
Setting | JP1 |
3F8h (COM1:) | Pins 1 & 2, 7 & 8 closed |
2F8h (COM2:) | Pins 1 & 2, 8 & 9 closed |
3E8h (COM3:) | Pins 2 & 3, 7 & 8 closed |
2E8h (COM4:) | Pins 2 & 3, 8 & 9 closed |
INTERRUPT SELECTION | |
Setting | JP1 |
IRQ2 | Pins 10 & 11 closed |
IRQ3 | Pins 11 & 12 closed |
IRQ4 | Pins 5 & 6 closed |
IRQ5 | Pins 4 & 5 closed |
SUPPORTED STANDARD COMMANDS |
Basic AT Commands |
+++, ‘comma’, A/ |
A, D, E, H, L, M, N, Q, V, W, X, Y, Z |
&D, &F, &K, &V, &W, &Y, &Z |
S-Registers |
S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S25, S30, S36, S38, S46, S48, S82 |
S86, S95, S108, S109, S110 |
Note: See MHI documentation for complete information. |
UNIDENTIFIED COMMANDS | |
Command | Default |
S37 | 0 |
S43 | 0 |
Proprietary AT Command Set
AUTO-ANSWER MODE | ||
Type: | Configuration | |
Format: | AT [cmds] &An [cmds] | |
Description: | Sets the mode the modem will operate in on auto-answer. | |
Command | Function | |
í &A0 | Modem auto-answers in answer mode. | |
&A1 | Modem auto-answers in originate mode. | |
AUTO-RETRAIN | ||
Type: | Configuration | |
Format: | AT [cmds] &Bn [cmds] | |
Description: | Selects whether the modem will automatically perform a retrain sequence when line conditions change. | |
Command | Function | |
&B0 | Auto-retrain disabled. | |
í &B1 | Auto-retrain enabled. | |
CD SIGNAL | |
Type: | Configuration |
Format: | AT [cmds] &Cn [cmds] |
Description: | Controls the behaviour of the CD signal. |
Command | Function |
í &C0 | CD forced high. |
&C1 | CD forced high after carrier signal is detected. |
&C2 | CD forced high except during disconnect. |
COMMUNICATIONS MODE | |
Type: | Configuration |
Format: | AT [cmds] &Qn [cmds] |
Description: | Selects the communications mode the modem will use. |
Command | Mode |
&Q0 | Asynchronous direct mode. |
í &Q5 | Asynchronous V.42 reliable mode. |
&Q6 | Buffered asynchronous mode. |
&Q8 | Asynchronous MNP reliable mode. |
&Q9 | Asynchronous V.42bis only mode. |
DISPLAY INFORMATION | |
Type: | Immediate |
Format: | AT [cmds] In [cmds] |
Description: | Displays information requested about the modem. |
Command | Function |
I0 | Displays product identification code. |
I1 | Displays ROM checksum. |
I2 | Tests and reports ROM checksum. |
I3 | Displays firmware revision. |
I4 | Displays feature bitmap. |
EXTENDED RING | ||
Type: | Register | |
Format: | AT [cmds] S101=n [cmds] | |
Default: | 0 | |
Range: | 0-255 | |
Unit: | Bit-mapped | |
Description: | Selects which extended ring types the modem will respond to. | |
Bit | Value | Function |
0 | í 01 | Do not respond to ring type A. Respond to ring type A. |
1 | í 01 | Do not respond to ring type B. Respond to ring type B. |
2 | í 01 | Do not respond to ring type C. Respond to ring type C. |
3 | í 01 | Do not respond to ring type D. Respond to ring type D. |
4 | í 01 | Do not respond to ring type E. Respond to ring type E. |
5 | í 01 | Do not respond to ring type F. Respond to ring type F. |
6 | í 01 | Do not respond to ring type G. Respond to ring type G. |
7 | í 01 | Report RING for all ring types. Report RING n where n is the ring type. |
ON-LINE | |
Type: | Immediate |
Format: | AT [cmds] On |
Description: | Instructs the modem to return to on-line state. |
Command | Function |
O0 | Return to on-line state. |
O1 | Return to on-line state and initiate retrain sequence. |
O3 | Return to on-line state and initiate renegotiation sequence. |
PROTOCOL | |
Type: | Configuration |
Format: | AT [cmds] Bn [cmds] |
Description: | Selects the communication protocol for low-speed data calls. |
Command | Protocol |
B0 | Modem will use ITU-T V.22 at 1200bps. |
í B1 | Modem will use Bell 212A at 1200bps. |
B2 | Modem will use ITU-T V.23 at receive 1200/transmit 75bps. |
B3 | Modem will use ITU-T V.23 at receive 75/transmit 1200bps. |
B15 | Modem will use ITU-T V.21 at 300bps. |
í B16 | Modem will use Bell 103A at 300bps. |
TRELLIS CODING | ||
Type: | Configuration | |
Format: | AT [cmds] &Un [cmds] | |
Description: | Selects whether the modem will use trellis coding. | |
Command | Function | |
í &U0 | Trellis coding enabled. | |
&U1 | Trellis coding disabled. | |