Message Naming; Number Formats; Ubx Checksum - u-blox ZED-F9P Interface Description

5.3.4 Message Naming

Referring to messages is done by adding the class name and a dash in front of the message name. For example,
the version information message is referred to as UBX-MON-VER. Referring to message fields or their values is
done by adding a dot and the name, e.g. UBX-MON-VER.swVersion.

5.3.5 Number Formats

All multi-byte values are ordered in Little Endian format, unless otherwise indicated.
All floating point values are transmitted in IEEE754 single or double precision.
Variable Type Definitions
Short Type
U1 Unsigned Char
RU1_3 Unsigned Char
I1 Signed Char
X1 Bitfield
U2 Unsigned Short
I2 Signed Short
X2 Bitfield
U4 Unsigned Long
I4 Signed Long
X4 Bitfield
R4 IEEE 754 Single Precision
R8 IEEE 754 Double Precision
CH ASCII / ISO 8859.1 Encoding

5.4 UBX Checksum

The checksum is calculated over the Message, starting and including the CLASS field, up until, but excluding,
the Checksum Field:
UBX-18010854 - R04
Size Comment
(Bytes)
1
1 binary floating
point with 3 bit
exponent, eeeb
bbbb, (Value &
0x1F) << (Value
>> 5)
1 2's complement
1
2
2 2's complement
2
4
4 2's complement
4
4
8
1
Advance Information
u-blox ZED-F9P Interface Description - Manual
Min/Max Resolution
0..255 1
0..(31*2^7) non- ~ 2^(Value >> 5)
continuous
-128 .. 127 1
n/a n/a
0 .. 65535 1
-32768 .. 32767 1
n/a n/a
0 .. 1
4'294'967'295
-2'147'483'648 .. 1
2'147'483'647
n/a n/a
-1*2^+127 .. ~ Value * 2^-24
2^+127
-1*2^+1023 .. ~ Value * 2^-53
2^+1023
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