User's Manual

New Product Requirement
Asiatelco Technologies Co. Proprietary/Confidential
4 Software Requirements
4.1 Basic Software Requirements
Items Requirement
Air Interface CDMA 2000 1x 800/1900MHz; GPS
1x Data Required
IP Stack
Ipv4/IPV6
Upgrade Method Remote update / PC tool
RUIM Optional
Compatible with None-RUIM Required
Remote Update Required
Power Modes Required
AT Command Required
Report
Required；3000records
Driver
GPIO，LED，GPS，UART
GPIOs
Interrupt for Door Open Detect, Ignition
Status
LEDs GPS Status, CDMA Status
Watch Dog Required (CBP8.2 integrated)
Reset Soft reset
Startup Banner Required
4.2 Remote Update
The MC891G supports OTA field upgrades of the MC891G resident application. An over the
air TFTP (Trivial File Transfer Protocol) connection is made over a UDP/IP connection. A
replacement file is then transferred from a server to the MC891G and that file replaces the
previous application image.
4.2.1 Auto Execute
The Auto Execute Utility copies the contents of file system.exf into system executable RAM
and executes it from there. This file is the factory default application. Another file named
custom.exf can be loaded into the file system.
Auto Execute will look first for a file named update.exf and load and execute that in place of
custom.exf if it exists. If update.exf executes successfully, the previous copy of custom.exf is
deleted from the file system and update.exf is renamed to custom.exf.
4.3 Power Modes
The MC891G device supports several power modes that are set by the power mode
command. In full power mode the cellular subsystem will maintain a persistent cellular
connection whenever service is available as well as an IP connection where available.
Any hardware or software reset will interrupt any power mode and return the device to full
power mode. In summary, the conditions permanently restoring full power mode include: