NavCom LAND-PAK Rev.N User Manual
Page 106
Technical Reference Manual Rev. N
Blk = All;
Blu = IOP w/Internal Radio
;
Red = IOP & LBM
;
Grn = Engine only
104
Ref
Message Field Description
Data
Type
Units
Range
Scale
Byte
Count
W3
Result
B0=1: No such file
B1=1: Can’t open file for reading
B2=1: A file is already open for reading
The rest of the bytes appear only if W3 = 0
U08
1
W4
Spare
U08
1
W5
Reserved
U16
2
W6
File Handle
U16
2
W7
File Size in Sectors (1 sector = 512 bytes)
U32
4
W8
File Size in Bytes
U32
4
W9
Creation Date
B15-B9: Years since
B8-B5:
B4-B0:
U16
years
month
day
0-65535
1-12
1-31
n+1980
2
W10
Creation Time
B15-B11:
B10-B5:
B4-B0:
U16
hrs
min
sec
0-23
0-59
0-29
n/2
2
W11
Modification Date
B15-B9: Years since
B8-B5:
B4-B0:
U16
years
month
day
0-65535
1-12
1-31
n+1980
2
W12
Modification Time
B15-B11:
B10-B5:
B4-B0:
U16
hrs
min
sec
0-23
0-59
0-29
n/2
2
W13
File
Attributes
U16
2
W14
Access Date
B15-B9: Years since
B8-B5:
B4-B0:
U16
years
month
day
0-65535
1-12
1-31
n+1980
2
W15
File Name – Null Terminated String
U08[]
1[]
CKSM Checksum
U08
1
ETX
03
(hex)
U08
1
0x09 – File Record Request
After command 0x7e.0x08 (Open File for Reading) has been successfully issued, use this
command as many times as necessary to retrieve the file contents, one sector (512 bytes) at
a time. The number of sectors occupied by the file is returned in W7 (File Size in Sectors) of
the response to the Open File for Reading request. The range of validity of the sector
number field in the File Record Request is 0 to (File Size in Sectors – 1), inclusive. The file
handle should match the one returned in the response to 0x7e.0x08.
The response contains a result code with possible failure conditions as specified above. If
this result code is zero, then the request was successful, and the contents of the requested
sector appear in W8. There may be up to 512 bytes in this field; the number of data bytes is
specified in W7. In general, only the final sector will contain fewer than 512 data bytes.
If no response to a File Record Request is received (i.e. due to intermittent communication),
the missing sector may be re-requested by sending a duplicate request message.