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CH2124

HIGH SPEED INTERNET MODEM FAMILY

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

High Speed Internet Modem Family

• User Name

• Password

• ISP Telephone Number

• Mail Server HEX Address

• Local Email Address

• Destination Email Address

• User Specified Email

Message/Input Port Status

• User ID

User Supplied Parameters

CH21XX

iModem

Product

Family

Internet

(PPP, SMTP, TCP/IP,

POP3)

• Send email

• Retrieve email

Functions Performed

Figure 1. Conceptualized Block Diagram illustrating the Cermetek CH21XX iModem product family

performing the embedded internet application function.

The CH21XX iModem product uses the supplied user

parameters to establish an internet connection and

then either sends and/or retrieves email (depending on

the iModem model and the users requirements). The

CH21XX iModem products can store limited email,

approximately 125 ASCII characters in length, for later

transmission. At the completion of the internet activity,

the iModem terminates the internet connection.

Each CH2156/60 (CH2124) iModem contains a fully

functional 56kbps (2400bps) modem along with the

hardware and software needed to provide the internet

capability. Because of this architecture, the iModem

has the unique ability to operate as either an internet

email transceiver or as a high reliability analog

modem. Additionally, the presence of the modem

function allows the user remote access to reprogram

or reconfigure the iModem should the need arise.

The iModem Family of products are pin compatible

with the CH179X and CH2056 modem products.

Referring to Figure 2, the CH21XX iModem Family

consists of an industrial grade high speed modem

module and a µP controller with associated internal

logic. The µP controller and the logic provide all the

functions required for internet communication via

standard PSTN telephones lines. The iModem utilizes

TCP/IP, PPP, PAP, CHAP, SMTP and POP3 internet

protocols.

The iModem requires an external RJ-11C jack for the

PSTN line connection. An optional CCITT V.24 serial

interface is required when host processor control of

the iModem is required in the specific application. All

received emails are presented on the RS232 interface

for further host processing and/or retention by the host

system.

The iModem Family is FCC Part 68 approved and

Canadian DOT approvable. The modules are

designed for PCB through-hole mounting and are

1.35” x 1.97” x 0.55” in size.

iMODEM NETWORK ISP

A valid ISP account ID and password are required to

access the internet. As a convenience to our

customers, and to facilitate operational use of the

iModem, Cermetek supplies each iModem with a pre-

programmed account on the Cermetek iModem

Network ISP. This account is provided on a 90 day

free trail offer basis. Cermetek established the

iModem Network ISP to provide embedded internet

appliance users with features and services tuned to

the unique demands of the internet appliance

environment. In addition to standard email service, the

iModem Network ISP can provide: email to FAX,

email to Voice, email to dynamic web page update,

email to ftp and email re-routing. Refer to Cermetek

Application Note # 149, Cermetek Internet Service

(ISP) Description of Features and Services, for more

details.

iMODEM CONTROL METHODOLOGIES

The iModem receives @T® commands from the host

processor or receives an event status flag on the Send

Email Control Pin (Pin #6) and proceeds to dial up the

local POP, log on to the internet, authenticate and

verify the user ID and password, and either send or

retrieve email depending on the command/status flag

received. See Table 1 for a summary of available

@T® commands.

The iModem Family offers a variety of internet

communication features ranging from simple on

2003 Cermetek Microelectronics, Inc.

Page 2

Document No. 607-0017 Revision G1 (06/03)

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