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LTI TruPoint 200h User’s Manual • Section 10 - Serial Communication/String/Bluetooth
Page 64
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Section 10 - Serial Communication/String/Bluetooth
The TruPoint 200h has two Bluetooth options that have different serial protocols.
Bluetooth Classic
: Compatible with LTI and 3rd party software/app solutions utilizing the LTI's
Criterion 400 (CR400) communication protocol. Please contact LTI Service Tech Support for more
information on download formats and serial interface communication messages.
Bluetooth LE (BLE)
: New designed LTI BLE communication protocol. App interface developers
kit information is available, please contact LTI Service Tech Support for more information.
Bluetooth Classic Interface
The TruPoint 200h includes wireless Bluetooth communication. The measurement data downloaded
from the TruPoint is in ASCII Hex format, and duplicates LTI's Criterion 400 (CR400)
communication protocol and download messages.
Download Message Format
The CR400 data format follows the guidelines of the NMEA Standard for interfacing Marine
Electronic Navigational Devices, Revision 2.0. NMEA 0183 provides for both standard and
proprietary data formats. Since none of the standard formats are useful for the data transferred
from the TruPoint 200h, special proprietary formats are used. Rules described in the NMEA
standard governing general message structure, leading and trailing characters, numeric values,
delimiting character, checksums, maximum line length, data rate, and bit format are followed
exactly. As required by NMEA 0183, the CR400-format does not respond to unrecognized
header formats, malformed messages, or messages with invalid checksums.
**Draft B**