BandRich Inc. M280 User Manual
6
1.4 Network
LED
indicate
device
The Network LED indicated device is ground-referenced current sink. The host drives the device to
provide a current path and an appropriate voltage for LED at PIN 42 of M280 module. Figure 2-2
shows the block diagram of the current drivers. Table 2-3 describes the LED output characteristics in
different states.
provide a current path and an appropriate voltage for LED at PIN 42 of M280 module. Figure 2-2
shows the block diagram of the current drivers. Table 2-3 describes the LED output characteristics in
different states.
Figure 1-4
LED Current Driver Example
Table 1-2 LED Output
LED State
Module Status Description
LED Characteristics
OFF
Module is not powered.
LED is OFF.
ON
Module is powered and camped on
network, but not transmitting or receiving.
network, but not transmitting or receiving.
LED is continuously ON.
Slow blink
Module is powered and searching for
network (not yet registered on network).
network (not yet registered on network).
LED is flashing at a steady slow
speed.
speed.
250ms
±5% ON period and
750ms
±5% OFF period
Intermittent
blink
blink
Module is transmitting or receiving
LED is flashing intermittently
during data transfer activity.
during data transfer activity.
50ms
±5% ON period and
250ms
±5% OFF period