CH2156 Ver la hoja de datos (PDF) - Cermetek Microelectronics
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CH2156 Datasheet PDF : 19 Pages
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If a carrier is detected, the iModem® 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 iModem® to pick up the telephone line
without dialing a number.
Table 4. Pin Comparison of CH179X, HS Modem and CH21XX
iModem® Family
iModem
PIN
CH21XX
CH179X and HS Modem
FAMILY
FAMILY
1
RING
RING
2
TIP
TP
3
TI
T1
4
NC
SENT
5
SPK
SPK
6
NC
SEND
7
NC
IN 1
8
OPEN*
IN 2
9
NC
NC
10
TXD
TXD
11
RXD
RXD
12
NC
NC
13
DTR
DTR
14
DSR
DSR
15
RI
RI
16
CTS
CTS
17
DCD
DCD
18
NC
NC
19
Vcc
20
GND
Vcc
GND
21
RST
RST
22
RTS
RTS
Example:
Enter:
Dial 9, pause, dial number.
ATDT9, T1234567
Multiple commas may be used for a greater delay time.
Touch Tone and Pause Dialing
The iModem® can use DTMF (touch-tones) “T”, or dial pulses “P”
when dialing a telephone number. If the dial command does not
specify which type to use, the modem defaults to the type last
specified. The power-on default value is T.
Example:
Enter:
Pulse dial 9, pause, touch-tone dial
number
ATDP9, T1234567
Redial Last Number.
Use A/, the repeat command, to redial the last telephone number
dialed when a busy signal is received.
Example:
Enter:
Touch-tone dial 9, pause, dial number,
return for command.
ATDP9, T1234567;
Return to Command State.
The iModem® can be forced to reenter the command state after
dialing (without hanging up) by ending the dial command with a
semi-colon. This is useful when using the modem as an auto
dialer.
Automatic Answering.
S0=0*
S0=1-254
S0=255
DO NOT ANSWER TELEPHONE
ANSWER ON RING 1 TO RING 254
ANSWER ON RING 255
*When S0 is set to 0, the modem will not auto answer.
PROGRAMING THE iModem®
Cemetek’s iModem® requires an ISP (Internet Service Provider)
address, ISP account password, local PSTN dial up phone
number and valid email address to send and receive emails.
The required information can be modified by including it on the
appropriate iNet AT® Command line at the time the commands
are issued from the host processor.
Commands can be issued to the iModem® using any number of
commercially available terminal emulation programs - such as
PROCOM or HYPER TERMINAL. As an added service to our
customers, each iModem® is shipped from the factory with a
default ISP account and password for interim use. The default
PSTN dial up phone # is local to Sunnyvale, CA.
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 commands the iModem® to pause for a specific length
of time. The factory default pause time is 2 seconds.
© 2000 Cermetek Microelectronics, Inc.
Page 9
Document No. 607-0017 Rev. B (06/00)
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