User's Manual

3
SMS active
In short connection mode, when the device is in hibernation, it can be
activated by receiving SMS
InDTU332N does not support this feature.
Auto active
Start timing when entering sleep mode, reach the scheduled time, then
re-dial up
Auto offline
Start timing from the successful dialing, and when the scheduled time is
reached, restart the communication module and enter the sleep mode.
Log
Enables the log function to output logs through the serial port, helping
engineering personnel observe the device running status.
Multi-serial port
communication
speed
Baud rate: 1200-115200 bps
RS 232/485
Supports RS 232/485 communication. Depends on the device model.
Software watchdog
Prevents accidental crash.
Hierarchical user
authentication
Supports two user levels: administrator and common user.
Default administrator user name/password: adm/123456;
Common user name/password: guest/123456.
Real-time clock
Upon power-off, a built-in super capacitance powers the RTC to avoid the
loss of system time. The power must persist for more than two hours;
otherwise, the clock is restored to the system time. Only some models
support this function.
Factory settings
restoration
Clears settings and writes default settings. This function is implemented
by configuration program.
Table 1-2 Network functions
Function
Description
PPP
Point-to-point dialing protocol.
CHAP
Authentication mode.
PAP
Authentication mode.
Automatic
authentication.
Uses PAP and CHAP in turn.
When a client requests to go online, DTU performs PAP authentication
first. If the authentication fails, DTU performs CHAP authentication. If the
authentication fails again, DTU performs PAP authentication. The
preceding procedures are repeated.
PPP echo
Maintains the connection between DTU and carrier network, preventing
forcible dormancy and detecting the stability of dialing connection.
ICMP detection
Maintains the connection between DTU and peer host.
Application layer
echo
Detects the connection with application server by monitoring the
heartbeat at application layer. Eg. TCP keep-alive or user-define packet.