DTC Communications Inc. LB1 User Manual
DTC Communications, Inc.
Page 3 of 7
BREAKWIRE
STANDBY
RESET
STATUS
REMOVAL
BATTERY
LB-1
HOLD RESET BUTTON
FOR 5 SECONDS FOR
DEFAULT OPERATION
A
M
P
R
G
R
O
Architecture
The control architecture of the LB-1 consists of three major blocks: the main microprocessor, the audio
generator, and the transmitter.
The main microprocessor is an ultra-low current device, running at 32 KHz. It performs all the timing and
monitoring functions, and communicates with the user via a serial port. The processor uses less than 100
uA of current, which insures a long battery life.
The audio generator is another microprocessor that functions as an audio tone generator. It runs at high
speed, which requires more battery power. Thus, it is only powered up when tone generation is required.
The transmitter is a stable, crystal-controlled transmitter with a power output of 30 mW, typical, (50 mW
maximum) over the rated battery life.
Dimensions
The LB-1 is nominally 3.37 in. x 2.125 in. x 0.120 in.
Labeling
The label on the bottom of the PC Board labels all significant functions and contacts. The label is designed
to be visually low-key.
Batteries
The only battery that should be inserted into the LB-1 is the CR-2016. The battery will only function when
the negative contact (the button) is toward the label. Inserting the batteries upside down will not harm the
unit, but it will not function properly.
CAUTION: When inserting batteries, be certain that the battery is going between the gold plated contacts
in the slot, and NOT between a contact and the plastic sidewall of the battery compartments. This could
damage the contacts beyond function.