AN2385 Freescale Semiconductor / Motorola, AN2385 Datasheet - Page 4

• Manufacturer Part Number: AN2385
• Description: GPRS Wireless Internet Connectivity Using DragonBall and Palm OS Based PDAs Application Note
• Manufacturer: Freescale Semiconductor / Motorola

GSM-GPRS Application
The generic form of key emulation AT commands is:
character string showing the decimal ASCII value of the key being emulated. <CR> represents the 1-byte
ASCII value of carriage return, which is 0x0D.
For example, the decimal ASCII value of the character “1” is 49. Therefore, to emulate pressing the “1”
key on the phone, the PDA must send:
Table 1 shows the AT commands for key emulation used in this application.
3.2.1.2 AT Commands for Modem Testing, Control, and Configuration
Although there is a large number of AT commands for modem control and configuration, this application
needs only a few.
A total of 5 AT commands are used from this category. The actions that these commands perform include
testing the presence of the modem, changing the communication baud rate, setting the data flow control
mechanism, ignoring incoming calls, and dialing a given number.
Table 2 shows the AT commands belonging to this category.
4
AT Commands
ATS0 = 0 <CR>
AT <CR>
ATE0
Table 2. AT Commands for Modem Testing, Control, and Configuration
Table 1. AT Commands for Mobile Phone Key Emulation
Button
Detects the presence of the modem. The modem responds with OK.
Disables incoming calls.
Turns modem echo off.
TALK
OFF
Freescale Semiconductor, Inc.
0
1
2
3
4
5
6
7
8
9
#
*
For More Information On This Product,
AT+CKPD = 49 <CR>
Go to: www.freescale.com
AT Command String for Key Emulation
Meaning and Modem Response
AT+CKPD = 48 <CR>
AT+CKPD = 49 <CR>
AT+CKPD = 50 <CR>
AT+CKPD = 51 <CR>
AT+CKPD = 52 <CR>
AT+CKPD = 53 <CR>
AT+CKPD = 54 <CR>
AT+CKPD = 55 <CR>
AT+CKPD = 56 <CR>
AT+CKPD = 57 <CR>
AT+CKPD = 42 <CR>
AT+CKPD = 35 <CR>
AT+CKPD = 69 <CR>
AT+CKPD = 83 <CR>
AT+CKPD = xx <CR>
to the mobile phone.
, where,
xx
represents the
MOTOROLA