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Using Commands and Logs Chapter 4
EuroPak-15a Receiver User Manual Rev 5 37
3. The CRC is a 32-bit cyclic redundancy check performed on all data including the header. See
Section 4.4.2.5 on Page 41 for the CRC algorithm.
4. The header is in the format shown in Table 7 on Page 37.
Table 7: Binary Message Header Structure
Byte Hex Decimal
First AA 170
Second 44 68
Third 12 18
Field
Field
Name
Field
Type
Description
Binary
Bytes
Binary
Offset
Ignored
on Input
1 sync Char Hexadecimal 0xAA 1 0 N
2 sync Char Hexadecimal 0x44 1 1 N
3 sync Char Hexadecimal 0x12 1 2 N
4
header
length
UChar Length of the header 1 3 N
5
message
ID
UShort
Message ID. The message IDs for logs are given in
Table 34 on Page 71.
2 4 N
6
message
type
Char
Message type indicator, as explained in Section
4.2.1 on Page 34.
1 6 N
7
port
address
Char
The port from which the log was generated.
See Table 10 on Page 39.
1 7 N
8
message
length
UShort
The length in bytes of the body of the message. This
does not include the header nor the CRC.
2 8 N
9 sequence UShort
For multiple related logs. A number that counts
down from N-1 to 0 where N is the number of
related logs and 0 means it is the last one of the set.
Most logs only come out one at a time in which case
this number is 0.
2 10 N
10 idle time Char
The percentage of time that the processor is idle in
the last second. Take the time (0-200) and divide by
two to give the percentage of time (0-100%).
1 12 Y
11 time status Enum
The quality of the GPS time, as described in Section
4.4.2.4 on Page 40
1
a
13
N
b
12 week UShort GPS week number 2 14
N
b
13
milli-
seconds
GPSec Milliseconds from the beginning of the GPS week 4 16
N
b
14
receiver
status
ULong
32 bits representing the status of various hardware
and firmware components of the receiver. This
number is described in Table 46 on Page 93.
4 20 Y
15
Reserved
UShort
Reserved for internal use
2 24 Y
16 UShort 2 26 Y
a. This ENUM is not 4 bytes long but, as indicated in the table, is only 1 byte.
b. These time fields are ignored if Field #11, Time Status, is invalid. In this case the current receiver time is used. The
recommended values for the three time fields are 0, 0, 0.