8. OPERATION
39
LZ T 123 7 605 P1C
8. Operation
8.1 Switching On the Control Terminal
The Control Terminal is turned ON automatically once DC power is
applied. If the Control Terminal is turned OFF, using one of the methods
described in 8.2, the Control Terminal can be turned ON again through
one of two methods:
• pull signal TO_IN to ground for t >0.2s, then release.
• activate the main RS232 control line DTR, low to high for >0.2s
The Control Terminal is fully operational after 4 seconds. Logging onto a
network may take longer than this and is outside the control of the Control
Terminal.
Note!
The Control Terminal will not switch on if TO_IN is shorted to ground
when the dc supply is applied.
8.2 Switching Off the Control Terminal
There are two ways to switch off the Control Terminal as described below.
• Use the appropriate AT command (AT+CFUN);
• pull signal TO_IN to ground for t >0.2s, then release.
8.3 Resetting the Control Terminal
A full system reset, independent of the status of the software, may be
applied to the Control Terminal as follows:
• assert HR_IN high for > 3.5s.
8.4 Operating States/LED
The Control Terminal has a green LED, as depicted below, which is used
to indicate various operating states. These states are described in following
table.
LED