Laser Technology LTI 20/20 TruSpeed User Manual

Page 36 - Laser Technology, Inc. LTI 20/20 TruSpeed Metric User’s Manual 3rd Edition
Copyright (c)[2013] Laser Technology, Inc. All rights reserved. Unauthorized duplication, in whole or in part, is strictly prohibited
Section #5 - Serial Data Interface
The TruSpeed serial interface uses RS-232
+/-12V signal levels and data format.
Figure #34 shows the pin-out assignments
for the TruSpeed's serial port.
Data Format
TruSpeed serial data format is similar to that of
the Laser Technology Marksman 20/20 and
UltraLyte speed detection instruments. All data
values are available at the serial port after each
measurement.
Format Parameters
Download Instructions
The instructions below are provided for general information only. Specific steps
may vary, depending upon your data collection program.
1. Connect the TruSpeed to the PC, Pocket PC, etc.
2. Start the data collection program on the PC and adjust settings to
match format parameters (115200 baud, 8 data bits no parity,
1 stop bit).
3. Power ON the TruSpeed and verify that the speed mode is active.
4. Take the desired measurement.
Remote Trigger
It is possible to remotely trigger the TruSpeed and take measurements using an
external computer, data collector, or switch closure. Remote triggering is
accomplished by providing an open collector closure to ground or an active low
TTL or RS232 level signal to the 'trigger' pin on the serial connector. This option
requires a special order download cable that connects the remote trigger signal
from the TruSpeed to the 'RTS' output signal of a computer's serial port.
When using a serial cable with a remote trigger connection, care must be taken in
controlling the state of the RTS signal from the host computer. Often times the
default state of the RTS signal will be low, causing an inadvertent trigger of the
TruSpeed. Since the remote trigger signal is treated the same as a button press
on the TruSpeed, holding the signal low is identical to holding down a button,
which prevents a response to any additional keys that are pressed.
• 115200 BPS • 1 stop bit
• 1 start bit • no parity
• 8 data bits
Ground
Trigger
Serial Out
Serial In
1
2
3
4
Figure #34

Laser Technology LTI 20/20 TruSpeed Specifications

General

Brand	Laser Technology
Model	LTI 20/20 TruSpeed
Category	Measuring Instruments
Language	English