User Manual

Boomer II User Manual & Integrator’s Guide
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Installation
BM210012WT09 19 Wavenet Technology
LED Output Lines
In addition to the on-board LEDs there are three signal lines (Low
Battery, Message Waiting, In-range), which are controllable by the
modem for connection to an external LED. Each line has a 33Ù series
resistor and clamp diode to the internal supply line for protection. It is
recommended a series resistor be used with the external LED to limit
current accordingly. The electrical interface capability and function of
these signals are as follows:
Output Voltage Level 0 – 3.3V
Current Source/Sink ± 3mA (maximum)
The operation and active condition of these lines is summarized below.
LED Interface Definitions
J1
Pin #
Signal Description Signal Active State
13 LED0_MSGWTG
Message
waiting
Output Low when message waiting
14 LED1_INRANGE In range Output Low when modem in-range
15 LED2_LOWBAT Low battery Output
Low when battery is less than
3.5V,
High when battery is greater
than 3.6V
Low Battery
The Low Battery signal is held active low whenever the supply voltage
drops below an acceptable level (less than 3.5V) and deactivated when
the voltage level becomes acceptable again (greater than 3.6V). The
transitions will occur at the same time as the low battery event occurs
(or would occur if the event was activated). Note that in the case of a
very fast transition between voltages, it may take up to 20 seconds for
the modem to confirm a change in battery status.
Message Waiting
The Message waiting signal is held active low whenever there is at
least one message waiting in the inbound buffers to finish being sent to
the network, or at least one complete message in the outbound buffers
which hasn’t been sent to the local device.
In-Range
The In Range signal is held active low whenever the modem is in
range. It tracks the function of the Data Carrier Detect (DCD) signal.