VIA Technologies EPIA SN-Series Specifications download pdf (Page 94)

FASTER Engineering Model

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100

Accelerations are measured in G‟s (actual measurement range is ±4 G), angular rates

in deg/s (actual measurement range is ±200 deg/s), magnetic field components in Gauss

and temperature in °C. The digital data representing each measurement is sent as a 16-bit

number (data list in Table 14) and starts with a 2 byte header followed by the selected

functioning mode. At the end of each string a BIT message is present providing

comprehensive information into system health; 2 bytes checksum information is available

too. The BIT message definition is reported in Table 15 because during preliminary the

correct functioning of the unit has been verified using the proprietary software NAV-

VIEW, showing an error in the EEPROM integrity (bit 10) [Ref. (34)]. It seems that

EEPROM calibration data is corrupted, but the effects of this malfunction are not easily

measurable. Further investigation will be carried out in the future to solve the problem.

In the Simulink model a FIFO binary read block is used to transfer the acquired data

to the decoder where it is split and converted to numerical double values. Some of the

variables need to be converted before use.

Angle Mode Packet

Bytes

Description

Range

Units

0,1

Header

„A‟

3,4

Roll angle

[-180,180]

deg

5,6

Pitch angle

[-180,180]

deg

7,8

Heading angle (mag north)

[-180,180]

Deg

9,10

Roll angular rate

[-630,630]

Deg/s

11,12

Pitch angular rate

[-630,630]

Deg/s

13,14

Yaw angular rate

[-630,630]

Deg/s

15,16

X-axis acceleration

[-10,10]

17,18

Y-axis acceleration

[-10,10]

19,20

Z-axis acceleration

[-10,10]

21,22

X-axis magnetic field

[-1,1]

Gauss

23,24

Y-axis magnetic field

[-1,1]

Gauss

25,26

Z-axis magnetic field

[-1,1]

Gauss

27,28

Temperature

[-100,100]

°C

31,32

BIT

33,34

Checksum

Table 14: NAV420 Angle Mode Packet list

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 143 144

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VIA Technologies EPIA SN-Series Specifications Page 94

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