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Connections
The LRF Module interfaces to any host microcontroller or computer system using only four connections
(GND, VCC, SOUT, SIN).
Pin
Name
Type
1
GND
G
2
VCC
P
3
SOUT
O
4
SIN
I
Type: I = Input, O = Output, P = Power, G = Ground
Use the following example circuit for connecting the Parallax Laser Range Finder Module:
Usage
The LRF Module is controlled by the host via a serial communications interface. To use, simply align the
LRF Module towards the target object and send the desired command.
The serial interface is configured for 8 data bits, no parity, 1 stop bit (8N1). Automatic baud rate
detection occurs on initial power-up of the LRF Module. The Module waits for a "U" character to be sent
by the host and will set its baud rate to match that of the host. Supported baud rates include 300, 600,
1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200.
When the LRF is ready to receive commands, it will send a ":" to the host. The LRF waits in an idle state
until it receives a valid command, at which time it performs the command and returns command-specific
data (if any). The LRF will return a "?" upon receiving an invalid command.
Copyright © Parallax Inc.
Function
System ground. Connect to power supply's ground (GND) terminal.
System power. 5 VDC input.
Serial output to host. 5 V TTL-level interface, non-inverted, 8 data bits, no
parity, 1 stop bit, baud rate matched to host.
Serial input from host. 3.3 V to 5 V TTL-level interface, non-inverted, 8 data
bits, no parity, 1 stop bit, baud rate matched to host.
Parallax Laser Range Finder (#28044)
v2.0 10/31/2015 Page 2 of 23
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