9
The device provides transparent communication between a third-party external devices polling software and
an external device connected to the modem via RS232 interface. The modem tracks the internet connection
status and in case of connection loss, the modem restores it (see section
).
The ATM modem supports the use of two SIM cards providing backup mobile access (see section
).
The client mode supports backup Internet connection
– the main server switches to a backup server in case
of disconnection. Switching between servers is also possible with a signal from the modem GPIO pins (see
section
).
The client modem can operate with a standard server (see section
) or a special-
purpose iRZ Collector server. The iRZ Collector server provides transparent data communication between a
third-party polling software, operating as a client, and the modems which also operate as clients and do not
have static IP addresses (see section
"Working with the iRZ Collector Server"
).
The modem supports data transmission via CSD (voice channel). If there is phone number group enabled in
the modem settings, data transmission over CSD is available in the client and server mode. In addition, ATM
supports a separate mode for data transmission only over CSD.
The modem has additional pins (GPIO) to monitor and control external devices (see section
). ATM can send SMS messages at change of pin signal strength enabling remote control of external
devices connected to the modem. The pins state can be changed sending SMS command to the modem ena-
bling remote control of external devices.
The modem features the offline mode supporting all functions except network connection (see section
). Offline mode provides economy of traffic and power consumption. It is used if there is no need
for continuous connection.
ATM tracks the 3G module hangup and provides its additional restart by a signal from the configurable
watchdog timer (see section
"Watchdog Timers"
). GSM module rebooting can be initiated with a phone call
from a group of numbers, specified in ATM Control application (
Settings → Advanced→ WDT → Phone No.
for rebooting the module
), as well as with the SMS command "XXXX reboot", where XXXX is the access
code for service mode (5492 by default). The modem provides operation within a wide range of input voltages
and temperatures.
During its operation the modem displays messages in the log via USB interface in a real time. To view and
analyze the log on a computer, use any terminal program (see section "Main Log Messages").
2.2. Using the Document
Modem functions are described in sections
"Service Mode", "Offline Mode", "Updating Embedded Software
(Firmware)", "Setting Up the Modem", "Working with SIM Cards", "Connecting to the Server via SMS Com-
mands", "Data Transmission via CSD", "Watchdog Timers", "Real-Time Clock (RTC)", "GPIO Pins Operation",
"Operating with Incoming SMS Messages"
can be applied both to
"Client"
and
"Server"
modes. In cases
