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5.12 Buzzer
5.13 LED
LZT 123 7589 R1A
5. SYSTEM CONNECTOR INTERFACE
The electrical characteristics are given below. The signal reference is
DGND.
Mode
Normal Operation
Service/enable
programming
Absolute maximum
voltage
Pin
Signal
31
BUZZER
Connecting the BUZZER signal to an inverting transistor-buffer followed
by a piezoelectric transducer enables the radio device to play pre-
programmed melodies or sounds.
Pin
Signal
33
LED
The LED states shown below, are hard coded.
LED indication
No indication
Green, steady
Green, blinking
SERVICE Voltage (V)
Min.
Typ.
1.9
2.75V
Dir
Description
O
Buzzer output from radio device
Dir
Description
O
LED Output from radio device
Operational status
No power or in the OFF state
Power on, not connected to a network
Power on, connected to a network
Drive Capacity
Max.
0.8
-
3.6
> 1 mA
13.5
42
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