MC55i Terminal Hardware Interface Description
3.9 Status LED
32
MC55i_Terminal_HD_v01.201a
Page 30 of 47
2010-04-16
Confidential / Released
3.9
Status LED
A green LED displays the operating status of the terminal:
Figure 9:
Status LED
The LED is driven by the SYNC line of the integrated MC55i module which can be configured
by using the AT^SSYNC command. For the purpose of the MC55i Terminal it is recommended
to retain the default setting of AT^SSYNC=1 (AT^SSYNC=0 is not applicable).
The following table lists the possible LED patterns and describes the operating status of the
MC55i Terminal indicated by each pattern if AT^SSYNC=1.
During the transition from one LED pattern to another the "on" and/or "off" periods of the LED
may vary in length. This is because an event that triggers the change may occur any time and,
thus, truncate the current LED pattern at any point.
Table 12:
Coding of the green status LED
LED mode
Operating status of MC55i Terminal
Permanently off
MC55i Terminal is in one of the following modes:
•
POWER DOWN mode
•
ALARM mode
•
NON-CYCLIC SLEEP mode
•
CYCLIC SLEEP mode with no temporary wake-up event
1
in
progress.
1.
When a temporary wake-up event (for example URC, call, packet switched transfer) occurs in CYCLIC
SLEEP mode the LED flashes. See Chapter AT+CFUN provided in
for details on the various SLEEP
modes and wake-up events.
600 ms on / 600 ms off
Limited Network Service: No SIM card inserted or no PIN entered, or net-
work search in progress, or ongoing user authentication, or network login
in progress.
75 ms on / 3 s off
IDLE mode: The mobile is logged to the network (monitoring control
channels and user interactions). No call in progress.
75 ms on / 75 ms off /
75 ms on / 3 s off
One or more GPRS contexts activated.
500 ms on / 25 ms off
Packet switched data transfer in progress.
Permanently on
Depending on type of call:
Voice call:
Connected to remote party.
CSD call:
Connected to remote party or exchange of parameters while
setting up or disconnecting a call.
