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CH1782A

Family of Ultra Small Modem Modules V.22bis-2400bps

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

AT COMMAND APPLICATIONS

Dialing A Phone Number. The Dial command takes

the form Dn, where n is a string of characters. In the

simplest form, n will be only the digits of the phone

number to be dialed.

CH1782A Family of Ultra Small Modem Modules V.22bis-2400bps

Result: ATDT1234567R<CR> Previous command

OK

line executed

Return to Command State. Use ; to return to

command mode offer dialing.

Example: Dial number.

Enter: ATD1234567<CR>

Result: OK

In response to this command, the CH1782A dials the

telephone number “123-4567” and then waits for a

carrier from the distant modem. If no carrier is

detected within a given time (the default time is 30

seconds), the CH1782A automatically releases the

line and sends a NO CARRIER result code. If a

carrier is detected, the CH1782A gives a CONNECT

result code and goes on-line, permitting

communication with the distant modem.

The Dial Command may also be issued without a

telephone number. ATD causes the modem to pick

up the telephone line without dialing a number.

Example: Touch-tone dial 9, pause, dial number,

return to Command.

Enter: ATDT9,1234567;<CR>

Result: OK

Automatic Answering. The SO register controls the

number of rings that must occur before the modem

answers a call. The register may range in value from

0 to 255.

S0 =

S0 =

S0 =

S0 =

S0 =

0 DO NOT ANSWER TELEPHONE

1 ANSWER ON RING 1

2 ANSWER ON RING 2

3 ANSWER ON RING 3

255 ANSWER ON RING 255

When S0 is set to 0,the modem will not auto-answer.

Pause During Dialing. When placing a call from an

office with a telephone connected to a PBX, it may be

necessary to dial an access code (usually the digit 9)

to get an outside line. Inserting a comma in the

telephone number instructs the modem to pause for a

specific length of time. The factory set default pause

time is 2 seconds.

Example: Dial 9, pause, dial number.

Enter: ATDT9,1234567<CR>

Result: OK

Multiple commas may be used to generate integer

multiples of the specified delay time.

Originate a Call in Answer Mode. The D command

forces the modem into originate mode. To call an

originate-only modem, dial the number and set the

modem to answer mode via the R command (reverse

originate). This is done by including an R at the end

of the telephone number.

Example: Change modem from original-only to

answer mode.

Enter: ATDT1234567R<CR>

Result: OK

Multiple commas may be used to generate integer

multiples of the specified delay time.

Redial Last Number. The repeat command is a

convenient way to execute the previously entered

command line.

Example: Use A/, the repeat command, to redial the

last telephone number dialed.

Enter: A/

The Serial Interface Lines. The CH1782A supports

a full EIA-232D/V.24 serial interface. Signal levels are

TTL rather than EIA-232D level compatible, which

allows direct connection of the CH1782A to the host

UART without the need for level translation circuitry.

See Table 2 for a complete pin description.

The CH1782A is controlled by sending it serial

commands over TXD and it’s status determined by

monitoring the serial status messages returned on

RXD. DTR is optionally used to reset, terminate calls

or return CH1782A to command mode.

All other serial interface lines may be utilized for the

convenience of a particular application but are not

required by the CH1782A. Unused outputs (from

modem) should be left unconnected. Unused inputs

should be set to the proper logic level. See Table 2.

Voice/DTMF Tone Injection Port. The CH1782A

provides two pins to allow the user to share the

telephone line interface associated with the modem

for voice and DTMF applications. Figure 4 contains a

schematic indicating one possible configuration for

voice/ tone utilization.

WARNING

The CH1782A has been FCC Part 68 approved

as a data modem only. Utilization of the

Voice/DTMF Tone Port requires further

registration. FCC will require that the system,

including the CH1782A and the handset or

DTMF transceiver, adhere to Part 68 rules.

2002 Cermetek Microelectronics, Inc.

Page 9

Document No. 607-0009 Revision C (01/03)

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