iRZ ES75iT, Руководство пользователя

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The modem can be shut down using one of the following ways:
Program method using AT-commands only in case transition to sleep mode is allowed. If not then the
managing microcontroller will re-enable the GSM module. See Part 3.4;
Power shutdown.
When shutting down using AT-commands the modem goes into a sleep mode (minimal energy
consumption). Emergence from the sleep mode occurs along the line of the DTR COM-port (transition from a
passive to an active state) or when the GSM module is turned on by the alarm-clock.
3.3. Types of watchdog timers
Several types of watchdog timers are provided in the GSM modem:
Built-in watchdog timer in the managing microcontroller. The microcontroller itself is monitored for a
possibility of software crash (It is permanently on and cannot be turned off);
A regular check by the managing microcontroller for a possibility of the GSM module deadlock. The
time interval can be set from 1 minute to 255 with 1 minute step. The principle of its operation implies
that the managing microcontroller periodically sends the “at” command (speed 115200bit/s, 8-N-1) to
the second COM-port of the module (UART1) and awaits a response “at”, and then “OK”. If no response
is received the GSM module reboots. The module’s power in the meantime is shut down. This function
can be activated or switched off in the menu mode. This function is switched off by default.
An unconditional reboot of the modem after a period of time set by user. This function is switched off by
default. The period of time can be set between 1 and 255 hours in 1 hour increments. The principle of
its operation implies that the managing microcontroller after a set period of time reboots the GSM
module and the module’s power is shut down. The control of this function is done in the menu mode.
3.4. Menu mode
The menu mode’s function is to change the modem’s parameters and access the statistics. In this mode,
the power of the GSM module is switched off. After leaving the menu mode, automatic rebooting takes place.
The menu mode can be accessed from the work mode. Before accessing the menu mode connect the modem
to the computer using the DB9 connector (RS232 interface: speed – 115200 bps, 8-N-1). Run Hyper Terminal
or a similar program.
Remove the SIM-tray (by pressing the SIM-tray ejector button). The modem will go into the menu mode:
Menu mode:
Variant 05
<P1> View statistics
<P2> WD interval = OFF (or “XXX h”)
<P3> 'AT' control = OFF (or “XXX min”)
<P4> Sleep mode = OFF (or “ON”)
<PC> Power control
<PR> Clear statistics