Specifications

BATS AND PORTABLE BATS OPERATION
3-82
Some of the formats can have their range parameters changed from either Meters, Feet, or yards.
NMEA Formats
General Statement on NMEA Formats: The NMEA data sentences are output in accordance with the
NMEA standard. The electrical protocol can either be RS232 or RS422 depending on the output de-
vice of the transmitting unit. Not discussed here. Complete NMEA specification is available in
"NMEA 0183, version 3.0". Standard is published by National Marine Electronics association,
http://www.nmea.org/0183.
The output sentences are a proprietary message which is denoted by the “P” character following
the start of message “$” sign. The “ORE” is the manufacturers three character mnemonic code. The
letter following the ”ORE” is the specific output message identifier for particular format shown.
Data fields in the sentence follow a “,” delimiter and consist of ASCII characters (from 20 – 127
decimal or from HEX 14 to HEX 7E). Because of the presence of variable fields and null fields, spe-
cific data fields may only be located within a sentence by observing the field delimiters “,”. There-
fore, it is essential for the LISTENER to locate fields by counting delimiters rather than counting
total number of characters received from the start of the sentences.
The Checksum is the 8-bit exclusive OR (no start or stop bits) of all characters in the sentence, in-
cluding ”,” delimiters between but not including the “$” and the “*” delimiters. The hexadecimal
value of the most significant and least significant 4 bits of the result are converted to two ASCII
characters (0-9, A-F) for transmission. The most significant value is transmitted first. The receiv-
ing application should calculate the checksum of the message and compare it to the received
checksum.
3.7.2.1 “PORE” DATA OUTPUT PARAMETER DESCRIPTION
Format “PORE” or NMEA ORE is a NMEA 0183 string length of 70 characters not including
<CR><LF>. It follows the sentence structure for a NMEA 0183 version 2.1 proprietary sentence.
The system automatically switches to this format when the AUTO OFFSET function is initiated. This
allows greater resolution for reading of pitch and roll data. The system reverts back to the previous
format once AUTO OFFSET has been completed.
Sample…
Example of Format: NMEA ORE
$PORE,##,HHMMSS, , , B R G , X ( m ) , Y ( m ) , Z ( m ) , R O L L , P T C H , WC, QF* CS
$PORE,01 , 0 7 2 4 5 0 , , , 3 0 0 . 8 , - 0 0 0 0 1 . 0 , 0 0 0 0 0 0 . 6 , 0 0 5 0 5 . 4 , 0 0 0 . 0 0 , 0 0 0 . 0 0 , 0 0 , 1 0 * 1 8
...with compass heading enabled
$PORE,##,HHMMSS,HDG,ID, BRG, X (m), Y (m) , Z (m), ROLL, PTCH,WC, QF* C S
$PORE,01,072537,125.8,M,125.5,000000.2,- 0 0 0 0 0 . 2 , 0 0 5 0 5 . 4 , - 00.03,- 0 0 . 0 2 , 0 0 , 1 0 * 1 6