ECHO COMMUNICATIONS
I336PF
Card Type | Modem (asynchronous) |
Chipset | U.S. Robotics |
Maximum Data Rate | 33.6Kbps |
Maximum Fax Rate | 14.4Kbps |
Data Modulation | Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 Rockwell V.FC |
Fax Modulation | ITU-T V.17, V21CH2, V.27ter, V.29 |
Error Correction/Compression | MNP5, V.42, V.42bis |
Fax Class | Class I & II |
Data Bus | 8-bit ISA |

CONNECTIONS | |||
Function | Label | Function | Label |
Telephone line | CN1 | Telephone line | CN2 |
SUPPORTED STANDARD COMMANDS |
Basic AT Commands |
+++, ‘comma’, A/ |
A, B, C, D, E, F, H, L, M, O, P, Q, T, V, X |
&C, &D, &G, &P, &R, &S, &T, &W |
S-Registers |
S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S25, S38 |
Note: See MHI help file for complete information. |
Proprietary AT Command Set
BIT-MAPPED REGISTER S13 | ||
Format | AT [cmds] S13=n [cmds] | |
Default: | 0 | |
Range: | 0 - 217 | |
Description: | Controls DTR reset, DTR dialing, reset dialing, and MNP3. | |
Bit | Value | Function |
0 | í 01 | DTR normal. Reset on low DTR. |
2, 1 | 00 | Not used. |
3 | í 01 | DTR dialing disabled. DTR dialing enabled. |
4 | í 01 | Reset dialing disabled. Reset dialing enabled. |
5 | 0 | Not used. |
6 | í 01 | MNP 3 enabled. MNP 3 disabled. |
BIT-MAPPED REGISTER S15 | ||
Format: | AT [cmds] S15=n [cmds] | |
Default: | 0 | |
Range: | 0 - 56 | |
Description: | Controls non-error-correcting mode buffer, MNP4, and BS/DEL switch. | |
Bit | Value | Function |
2 - 0 | 000 | Not used. |
3 | í 01 | Non-error-correcting mode transmit buffer set to 1.5KB. Non-error-correcting mode transmit buffer set to 128 bytes. |
4 | í 01 | MNP 4 enabled. MNP 4 disabled. |
5 | í 01 | Backspace and delete keys normal. Backspace and delete keys reversed. |
BIT-MAPPED REGISTER S27 | ||
Format: | AT [cmds] S27=n [cmds] | |
Default: | 0 | |
Range: | 0 - 191 | |
Description: | Controls V.21, V.32 encoding and modulation, V.42 answer tone and handshake, and 9600 result codes. | |
Bit | Value | Function |
0 | í 01 | V.21 disabled. V.21 enabled. |
1 | í 01 | V.32 trellis coding enabled. V.32 trellis coding disabled. |
2 | í 01 | V.32 modulation enabled. V.32 modulation disabled. |
3 | í 01 | 2100Hz answer tone enabled. 2100Hz answer tone disabled. |
5, 4 | í 0001 10 11 | V.42 detect, LAPM and MNP enabled. V.42 detect and LAPM enabled. MNP enabled. LAPM enabled. |
6 | 0 | Not used. |
7 | í 01 | Actual result codes displayed. Force 9600 result codes. |
BREAK LENGTH | |
Type: | Register |
Format: | AT [cmds] S21=n [cmds] |
Default: | 10 |
Range: | 0 - 255 |
Unit: | 10 ms |
Description: | Sets the length of error control mode breaks sent from DCE to DTE. |
BREAK TYPE | |
Type: | Configuration |
Format: | AT [cmds] &Yn [cmds] |
Description: | Configures action of break signal. |
Command | Function |
&Y0 | Break empties buffer and is not send to remote modem. |
í &Y1 | Break empties buffer and is sent immediately to remote modem. |
&Y2 | Break does not empty buffer and is sent immediately to remote modem. |
COMPRESSION AND ERROR CORRECTION | ||
Type: | Register | |
Format: | AT [cmds] S51=n [cmds] | |
Default: | 0 | |
Range: | 0 - 7 | |
Description: | Selects compression and error correction for specific modulations. | |
Bit | Value | Function |
0 | í 01 | MNP/V.42 enabled during V.22 operation. MNP/V.42 disabled during V.22 operation. |
1 | í 01 | MNP/V.42 enabled during V.22bis operation. MNP/V.42 disabled during V.22bis operation. |
2 | í 01 | MNP/V.42 enabled during V.32bis operation. MNP/V.42 disabled during V.32bis operation. |
COMPRESSION MODE | |
Type: | Configuration |
Format: | AT [cmds] &Kn [cmds] |
Description: | Selects the type of data compression that will be used. |
Command | Function |
&K0 | Data compression disabled. |
í &K1 | Auto-detect compression mode. |
&K2 | Data compression enabled. |
&K3 | MNP5 data compression only enabled. |
CONNECTION SPEED UPPER LIMIT | |
Type: | Configuration |
Format: | AT [cmds] &Nn [cmds] |
Description: | Sets required connection speed if &U is set to 0; otherwise, sets fastest allowed connection speed. |
Command | Function |
í &N0 | No maximum connect speed. |
&N1 | Set maximum connect speed to 300bps. |
&N2 | Set maximum connect speed to 1200bps. |
&N3 | Set maximum connect speed to 2400bps. |
&N4 | Set maximum connect speed to 4800bps. |
&N5 | Set maximum connect speed to 7200bps. |
&N6 | Set maximum connect speed to 9600bps. |
&N7 | Set maximum connect speed to 12Kbps. |
&N8 | Set maximum connect speed to 14.4Kbps. |
&N9 | Set maximum connect speed to 16.8Kbps. |
&N10 | Set maximum connect speed to 19.2Kbps. |
&N11 | Set maximum connect speed to 21.6Kbps. |
CONNECTION SPEED UPPER LIMIT (CON’T) | |
Command | Function |
&N12 | Set maximum connect speed to 24Kbps. |
&N13 | Set maximum connect speed to 26.4Kbps. |
&N14 | Set maximum connect speed to 28.8Kbps. |
&N15 | Set maximum connect speed to 31.2Kbps. |
&N16 | Set maximum connect speed to 33.6Kbps. |
CONNECTION SPEED LOWER LIMIT | |
Type: | Configuration |
Format: | AT [cmds] &Un [cmds] |
Description: | Sets slowest allowed connection speed if &N is set to 1 or higher. |
Command | Function |
í &U0 | No minimum connect speed. |
&U1 | Set minimum connect speed to 300bps. |
&U2 | Set minimum connect speed to 1200bps. |
&U3 | Set minimum connect speed to 2400bps. |
&U4 | Set minimum connect speed to 4800bps. |
&U5 | Set minimum connect speed to 7200bps. |
&U6 | Set minimum connect speed to 9600bps. |
&U7 | Set minimum connect speed to 12Kbps. |
&U8 | Set minimum connect speed to 14.4Kbps. |
&U9 | Set minimum connect speed to 16.8Kbps. |
&U10 | Set minimum connect speed to 19.2Kbps. |
&U11 | Set minimum connect speed to 21.6Kbps. |
&U12 | Set minimum connect speed to 24Kbps. |
&U13 | Set minimum connect speed to 26.4Kbps. |
&U14 | Set minimum connect speed to 28.8Kbps. |
DISPLAY INFORMATION | |
Type: | Immediate |
Format: | AT [cmds] In [cmds] |
Description: | Displays modem properties. |
Command | Function |
I0 | Displays product identification code. |
I1 | Tests and displays ROM checksum result. |
I2 | Tests and displays RAM checksum result. |
I3 | Displays product type. |
I4 | Displays current command settings. |
I5 | Displays current NVRAM settings. |
I6 | Displays current connection’s statistics. |
I7 | Displays product configuration. |
DISPLAY LAST DIAL STRING | |
Type: | Immediate |
Format: | AT [cmds] &ZL? [cmds] |
Description: | Displays the last executed dial string. |
ERROR CORRECTION MODE | |
Type: | Configuration |
Format: | AT [cmds] &Mn [cmds] |
Description: | Selects active error correction protocols. |
Command | Function |
&M0 | Normal mode only. |
í &M4 | Auto-detect mode. |
&M5 | ARQ mode only. |
ESCAPE SEQUENCE RESPONSE | |
Type: | Register |
Format: | AT [cmds] S14=n [cmds] |
Description: | Controls the modem's reaction to an escape sequence. |
Command | Function |
S14=0 | Normal operation. |
S14=1 | When +++ is received, modem disconnects and enters command state. |
EXTENDED RESULT CODES | |
Type: | Configuration |
Format: | AT [cmds] &An [cmds] |
Description: | Selects extended result codes. |
Command | Function |
&A0 | Extended result codes disabled. |
&A1 | ARQ result codes enabled. |
&A2 | V.32 result code enabled. |
í &A3 | Error control and compression result codes enabled. |
FACTORY DEFAULTS | |
Type: | Immediate |
Format: | AT [cmds] &Fn [cmds] |
Description: | Resets the modem to the specified factory profile. |
Command | Function |
&F0 | Modem resets to factory generic profile. |
&F1 | Modem resets to factory hardware flow control profile. |
&F2 | Modem resets to factory software flow control profile. |
FLOW CONTROL CHARACTER - XOFF | |
Type: | Register |
Format: | AT [cmds] S23=n [cmds] |
Default: | 19 |
Range: | 0 - 127 |
Unit: | 1 ASCII character |
Description: | Sets the character used to represent XOFF. |
FLOW CONTROL CHARACTER - XON | |
Type: | Register |
Format: | AT [cmds] S22=n [cmds] |
Default: | 17 |
Range: | 0 - 127 |
Unit: | 1 ASCII character |
Description: | Sets the character used to represent XON. |
FLOW CONTROL TYPE | |
Type: | Configuration |
Format: | AT [cmds] &Hn [cmds] |
Description: | Sets type of flow control used by modem. |
Command | Function |
&H0 | Flow control disabled. |
í &H1 | CTS/RTS flow control enabled. |
&H2 | XON/XOFF flow control enabled. |
&H3 | CTS/RTS and XON/XOFF flow control enabled. |
HELP - AMPERSAND | |
Type: | Immediate |
Format: | AT [cmds] &$ |
Description: | Displays the AT& command set. |
HELP - BASIC | |
Type: | Immediate |
Format: | AT [cmds] $ |
Description: | Displays the basic (no prefix) AT command set. |
HELP - DIAL | |
Type: | Immediate |
Format: | AT [cmds] D$ |
Description: | Displays dialing options. |
INACTIVITY TIMER | |
Type: | Register |
Format: | AT [cmds] S19=n [cmds |
Default: | 0 |
Range: | 0 - 255 |
Unit: | 1 minute |
Description: | Sets the length of time that the modem does not receive information before it disconnects. |
LOCK SERIAL PORT | |
Type: | Configuration |
Format: | AT [cmds] &Bn [cmds] |
Description: | Sets operation of serial port speed. |
Command | Function |
&B0 | Serial speed follows connect speed. |
í &B1 | Serial speed locked. |
&B2 | Serial speed locked in ARQ mode only. |
PROFILE ON POWER-UP | |
Type: | Configuration |
Format: | AT [cmds] Yn [cmds] |
Description: | Selects the profile to restore into the active profile on power-up. |
Command | Function |
í Y0 | Restore profile 0 on power-up. |
Y1 | Restore profile 1 on power-up. |
RESET MODEM | |
Type: | Immediate |
Format: | AT [cmds] Zn [cmds] |
Description: | Resets the modem to the specified profile. |
Command | Function |
Z0 | Modem resets to profile set with the Y command. |
Z1 | Modem resets to user profile 0. |
Z2 | Modem resets to user profile 1. |
Z3 | Modem resets to factory generic profile. |
Z4 | Modem resets to factory hardware flow control profile. |
Z5 | Modem resets to factory software flow control profile. |
STORE TELEPHONE NUMBER | |
Type: | Configuration |
Format: | AT [cmds] &Zn= <#>AT [cmds] &Zn=L |
Description: | Writes the indicated telephone number into the non-volatile memory at location n. If the second form is used, the last dial string executed will be stored. |
TONE DIALING TEST | |
Type: | Register |
Format: | AT [cmds] S16=n [cmds] |
Description: | Begins a tone dialing test. |
Command | Function |
í S16=0 | Tone dialing test disabled. |
S16=2 | Tone dialing test enabled. |
V.32 AND V.32bis MODULATIONS | ||
Type: | Register | |
Format: | AT [cmds] S34=n [cmds] | |
Default: | 6 | |
Range: | 0 - 15 | |
Description: | Controls V.32 and V.32bis modulations. | |
Bit | Value | Function |
0 | í 01 | V.32bis enabled. V.32bis disabled. |
2, 1 | 11 | Not used. |
3 | í 01 | V.32 modulation disabled. V.32 modulation enabled. |
V.32 HANDSHAKE TIME | |
Type: | Register |
Format: | AT [cmds] S28=n [cmds] |
Default: | 8 |
Range: | 0 - 255 |
Unit: | .1 second |
Description: | Sets the length of the V.32 handshaking phase. |
V.34 AND V.FC OPTIONS | ||
Format: | AT [cmds] S56=n [cmds] | |
Default: | 0 | |
Range: | 0 - 223 | |
Description: | Controls non-linear coding, transmit level deviation, pre-emphasis, pre-coding, shaping, V.34, and V.FC. | |
Bit | Value | Function |
0 | í 01 | Non-linear coding enabled. Non-linear coding disabled. |
1 | í 01 | Transmit level deviation enabled. Transmit level deviation disabled. |
2 | í 01 | Pre-emphasis enabled. Pre-emphasis disabled. |
3 | í 01 | Pre-coding enabled. Pre-coding disabled. |
4 | í 01 | Shaping enabled. Shaping disabled. |
5 | 0 | Not used. |
6 | í 01 | V.34 enabled. V.34 disabled. |
7 | í 01 | V.FC enabled. V.FC disabled. |
V.34 MAPPING | ||
Type: | Register | |
Format: | AT [cmds] S55=n [cmds] | |
Default: | 0 | |
Range: | 0 - 15 | |
Description: | Controls V.34 mapping. | |
Bit | Value | Function |
0 | í 01 | 8S-2D map enabled. 8S-2D map disabled. |
1 | í 01 | 16S-4D map enabled. 16S-4D map disabled. |
2 | í 01 | 32S-2D map enabled. 32S-2D map disabled. |
3 | í 01 | 64S-4D map enabled. 64S-4D map disabled. |
V.34 OPTIONS | ||
Type: | Register | |
Format: | AT [cmds] S54=n [cmds] | |
Default: | 0 | |
Range: | 0 - 255 | |
Description: | Controls V.34 baud rate, call indicate, and V.8. | |
Bit | Value | Function |
0 | í 01 | 2400 baud rate enabled. 2400 baud rate disabled. |
1 | í 01 | 2743 baud rate enabled. 2743 baud rate disabled. |
2 | í 01 | 2800 baud rate enabled. 2800 baud rate disabled. |
3 | í 01 | 3000 baud rate enabled. 3000 baud rate disabled. |
4 | í 01 | 3200 baud rate enabled. 3200 baud rate disabled. |
5 | í 01 | 3429 baud rate enabled. 3429 baud rate disabled. |
6 | í 01 | Call indicate during V.34 operation enabled. Call indicate during V.34 operation disabled. |
7 | í 01 | V.8 during V.34 operation enabled. V.8 during V.34 operation disabled. |
XON/XOFF PASS-THROUGH | |
Type: | Configuration |
Format: | AT [cmds] &In [cmds] |
Description: | Selects whether XON/XOFF signals received from the DTE are sent to the remote modem. |
Command | Function |
í &I0 | Software flow control disabled. |
&I1 | XON/XOFF passed through local modem. |
&I2 | XON/XOFF signals trapped by local modem. |