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Using Commands and Logs Chapter 4
EuroPak-15a Receiver User Manual Rev 5 39
Table 9: Byte Arrangements
4.4.2 Commonly-Used Fields
Some of the more commonly-used fields are discussed in this section.
4.4.2.1 Serial Port Identifiers
The values used to indicate serial ports are given below.
Table 10: Serial Port Identifier Values
4.4.2.2 Message Type Indicator
The Message Type Indicator is a byte given in numerous binary format messages and all binary headers. It
follows the format in Table 11 below.
Table 11: Message Type Byte Format
70
char
address n
15 7 0
shor
t
n + 1 address n
31 23 15 7 0
long tw o's complimen
t
n + 3 n + 2 n + 1 address n
63 62 52 51 0
double S Biased Exponent| 52-bits mantissa
n + 7 n + 6 n + 5 n + 4 n + 3 n + 2 n + 1 address n
31 30 23 22 0
float S Biased Exponent| 23-bits mantissa
n + 3 n + 2 n + 1 address n
ASCII Binary
COM1 32
COM3 96
Bit Description
0-4 Reserved
5-6
Message format, where
00 = Binary
01 = ASCII
10 = Abbreviated ASCII, NMEA
11 = Reserved
7
Response indicator, where
0 = original message
1 = response message.
(See Section 4.2 on Page 34 for more
information on logging data.)