CH1794A Cermetek Microelectronics, CH1794A Datasheet - Page 7

• Manufacturer Part Number: CH1794A
• Manufacturer: Cermetek Microelectronics

Specifications of CH1794A

• Lead Free Status / RoHS Status: Not Compliant

Cermetek Microelectronics, Inc.
Figure 4.
When entering commands to the modem, the
backspace character-control-H (ASCII 8 or HEX 08)
can be used to edit mistakes. AT and A/ may not be
edited however. Multiple commands may be placed
on a command line. A command line may be as long
as 40 characters, excluding the letters AT. By way of
example, the command below instructs the HS Modem
to configure itself to not echo characters when in
command mode (E0) and then puts itself in answer
mode (A).
Enter: ATE0A<CR>
Result: OK<CR><LF>
AT Command Set. The available command set is
divided
commands, ampersand, dial modifiers and percent
commands. Refer to the complete list in Table 6.
2007 Cermetek Microelectronics, Inc.
into
four
HS Modem Family Application Diagram.
types
of
commands:
basic
Page 7
INITIALIZING THE MODEM
Before commands may be sent to the HS Modem, the
modem must be initialized. This is a two step process:
Step 1. Modem Reset.
Step 2. Initial Modem Training. The modem must be
HS Modem Reset. Upon applying power to the HS
Modem, the HS Modem automatically generates an
internal reset pulse.
modem externally by applying a high-going reset pulse
to the RST pin for at least 10 msec after the +5V
power
commands to the HS Mode for 2 seconds after reset
has been initiated to allow the HS Modem time to
properly reconfigure.
CH179XA/2056A High Speed Family of Ultra Small Modems
applying a hardware-reset pulse to pin RST or
by switching the power off then back on.
trained to the host DTE speed and parity (odd,
even, mark, space or none). These activities
are briefly described below.
supply
has
Document No. 607-0020 Revision B (01/07)
stabilized.
The user can also reset the
This is accomplished by
Delay
sending