Edgetech Model 3100P Sub-bottom Sonar System Instrukcja Obsługi Pobierz pdf (Strona 26)

990-0000058-1000 Rev F Page 26

Table 4-2 NMEA Approved Sentence Structure

ASCII HEX DESCRIPTION

“$” 24 Start of Sentence

aa Dummy characters to start the Address Field (e.g. GP), not

used by EdgeTech products.

bbb Sentence Formatter. Mnemonic code identifying the data

type and the string format of the successive fields.

“,” 2C Field Delimiter. Starts each field except Address and

Checksum fields. If it is followed by a null field, it is all

that remains to indicate no data in the field.

c---c Data Sentence Block. Data field(s) preceded and separated

by delimiters.

“*” 2A Optional Checksum Delimiter.

hh Optional Checksum Field

<CR><LF> 0D 0A Terminates Sentence

4.3.1. Inputs

The following are the approved NMEA sentences recommended for use with the

DISCOVER based systems.

GLL – Geographic Position – Latitude/Longitude

Latitude and Longitude of the present vessel position, time of position fix and status.$--

GLL,xxxx.xxx,a,yyyyyy.yyy,b,hhmmss.ss,A*hh<CR><LF>

Table 4-3 GLL- Geographic Position-Latitude/Longitude

ARGUMENT

DESCRIPTION

xxxx.xxx Degrees|Minutes.decimal - 2 fixed digits of degrees, 2 fixed digits of

minutes and a variable number of digits for decimal fractions of minutes.

Leading zeros always included for degrees and minutes to maintain fixed

length.

a N for North Latitude or S for South Latitude

yyyyy.yyy Degrees|Minutes.decimal - 3 fixed digits of degrees, 2 fixed digits of

minutes and a variable number of digits for decimal fractions of minutes.

Leading zeros always included for degrees and minutes to maintain fixed

length.

b E for East Longitude or W for West Longitude

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