Application

What is the Device Interface Definition of FOG North Seeker

Azimuth survey FOG north seeker

1.Application products

ER-FNS-03 Low Cost 3 Axis FOG North Seeker

2.1 Data Interface

The SX1 connector leads to a J30J-21ZK connector, which is connected to a standard four-wire RS422. Users only need to connect the above serial port to the acquisition computer for measurement. Note that the baud rate is 614.4 kbps, which requires a matching acquisition device for data acquisition.

2. 2 Wiring definition

Table 5 Wiring definition:J30J-21ZK

No.J30 PinNorth Finder Connection PointDefinitionRemarks
11DY-6V_9V+12VPowered by
22DY-GND6GND
66DHB-BT+T+LED Digital Tube
77DHB-GNDGND
88DHB-DT+T+422
99DHB-DT-T-
1010DHB-DR-R-
1111DHB--DR+R+

2.3  Data Receiving Protocol From North seeker to Computer

ER-FNS-03 series north finder adopts RS422 serial port output. The baud rate is 19200bps. Each frame has a total of 60 bytes. Each byte contains 1 start bit (0), 8 data bits, 1 stop bit (1), each word. The lower part is transmitted first in the section, and the low byte is transmitted first for each frame of data, and there is no verification at this moment. The specific data format is shown in the following table:

Table 6 data frame format

Bytes (60 bytes in Total)Data contentSupplementary explanation
1~4Frame header0X EB8055AA
5~8X Gyro DataLow first and then high,Dimensionless digital quantity
9~12Y Gyro DataLow first and then high,Dimensionless digital quantity
13~16Z Gyro DataLow first and then high,Dimensionless digital quantity
17~20X Accelerometer dataLow first and then high,Dimensionless digital quantity
21~24Y Accelerometer dataLow first and then high,Dimensionless digital quantity
25~28Z Accelerometer dataLow first and then high,Dimensionless digital quantity
29~32latitudeLow first and then high,0.000001°
33~36longitudeLow first and then high,0.000001°
37~40heightLow first and then high,1m
41~44counterLow first and then high,2.5ms
45~46Pitch angle/tilt angleLow first and then high,0.01°
47~48Roll angleLow first and then high,0.01°
49~50Heading/azimuthLow first and then high,0.01°
51~56Pending byte
57~60End of frame0X FF000034

2.4  Data Transmit Protocol From Computer to North seeker

2.4.1 Total number of bytes delivered at a time: 21 bytes, baud rate 19200bps, no parity check. Each byte contains the start bit (0), data bit (8), and stop bit (1).

Start the work

Byte NumberDefinitionRemark
10xEB
20x80
30x00
40xCC
5-80x00
9-120x00
13-160x00
17-210x00

2.4.2  Send warp and weft height

Byte NumberDefinitionRemark
10xEB
20x80
30x00
40xAA
5-8latitude
9-12longitude
13-16highly
170xAA
180xBB
190xCC
200xDD
215 to 20 XOR check

Determine the definition of the data sent according to byte 4:

  1. If control_FLAG ==0xCC: Restarts
  2. If control_FLAG ==0xAA: Indicates the altitude of the latitude and longitude to be sent

Send order: 5-8 bytes: latitude (* 1E6, unit °)

9-12 bytes: Longitude (* 1E6, in °)

13-16 bytes: Height (*1, in m)

For example, C code that sends Latitude and longitude instructions (the rest of the byte configuration is arbitrary), Latitude is "Latitude *1e6", longitude is similar, height ratio is 1.

bytSend[0] = 0xeb;

bytSend[1] = 0x80;

bytSend[2] = 0x00;

bytSend[3] = 0xaa;

bytSend[4] = (Latitude>>24) & 0xff;

bytSend[5] = (Latitude>>16) & 0xff;

bytSend[6] = (Latitude>>8) & 0xff;

bytSend[7] = (Latitude) & 0xff;

bytSend[8] = (Longitude>>24) & 0xff;

bytSend[9] = (Longitude>>16) & 0xff;

bytSend[10] = (Longitude>>8) & 0xff;

bytSend[11] = (Longitude) & 0xff;

bytSend[12] = (Height>>24) & 0xff;

bytSend[13] = (Height>>16) & 0xff;

bytSend[14] = (Height>>8) & 0xff;

bytSend[15] = (Height) & 0xff;

bytSend[16] = 0xaa;

bytSend[17] = 0xbb;

bytSend[18] = 0xcc;

bytSend[19] = 0xdd;

bytSend[20] = b[4]^b[5]^...b[19];


More Technical Questions

1.What is the Device Interface Definition of MEMS North Seeker

2.How to Use Acquisition Software of MEMS North Seeker

3.How to Use Acquisition Software of FOG North Seeker

4.What Performance is the FOG sensor in FOG North Finder

5.What Performance is the Accelerometer Sensor in FOG North Finder

6.What is the System Structure of FOG North Finder


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