10
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
Summary of Contents for MC52PU
Page 1: ......