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2.5.3. USB type B connector
Connector USB (type B) is used for connection to controlling the device, USB interface. USB also used for
powering the modem, see chapter 3.
Fig. 2.5.3. USB connector type B
Table 2.5.3: Using USB type B connector pins
Pin Signal Purpose
1 V BUS +5 V (can be used to power the modem, see details in Chapter 3)
2
D−
Data transmission
3 D+ Data transmission
4 GND Ground
2.6. Modem status LED
LED is used to indicate the connection status. This function may be disabled by the following AT-command:
AT^SSYNC (AT^SSYNC=1 — on; AT^SSYNC=0 — off). By default, AT^SSYNC=1 (on).
Table 2.6.1: Connection status LED
LED mode Conditional indication
display Operation mode
Turned off
○
Modem is turned off or indication is shut down,
power saving mode, ALARM mode
600ms on / 600ms off
●●●●●● ○○○○○○
Modem is not logged to the network
75ms on / 3s off
● ○○○○○○○○○
...
○
Modem is logged to the network
75ms on / 75ms off /
75ms on / 3s off
● ○ ● ○○○○○○○
...
○
GPRS connection is activated
500ms on / 50ms off
●●●●● ○
Data transfer in progress (GPRS)
250ms on / 10s off
●●●●●●●●● …○
Sleep mode
Permanently turned on
●
Voice call, CSD