NavCom LAND-PAK Rev.N - Manual (Page 92)

Technical Reference Manual Rev. N
Blk = All; Blu = IOP w/Internal Radio ; Red = IOP & LBM ; Grn = Engine only 90
0x7c - User Text Message
The entire message (including protocol overhead, i.e., 0x02 0x99 0x66 … 0x03) will be copied
to the open file. If there is no open file, the message will be discarded, and if the ACK/NAK bit
of W1 was set, the IOP will respond with a message 0x7C error code equal to 0x32
(NAK_BadFileHandle). If the file system cannot be mounted, and if the ACK/NAK bit of W1 was
set, the IOP will respond with message 0x7C error code equal to 0x33
(NAK_MMCMountFailure).
The message contains a text string and can be used for incorporating arbitrary user
text/comments within a log file.
Command:
Record
Usage Command - Yes
Response - No
Input: contains a text string and can be used for incorporating arbitrary user
text/comments within a log file;
Output: see table below
Ref Message Field Description Data Type Units Range Scale
Byte
Count
STX 02 (hex) U08 1
PRA1 99 (hex) U08 1
PRA2 66 (hex) U08 1
ID 7c (hex) U08 1
Length 0xXXXX U16 2
W1
Action Control
B2: ACK/NAK
U08 1
W2 Mode = 0x00 (command) U08 1
W3 File Handle U16 2
W4
null-terminated text message, max
512 chars
U08[] 1[]
CKSM Checksum U08 1
ETX 03 (hex) U08 1
Response:
Record
Usage Command - No
Response - Yes
Input: see table above;
Output: reports contains a text string and can be used for incorporating
arbitrary user text/comments within a log file
Ref Message Field Description Data Type Units Range Scale
Byte
Count
STX 02 (hex) U08 1
PRA1 99 (hex) U08 1
PRA2 66 (hex) U08 1
ID 7c (hex) U08 1
Length 0x0008 U16 2
W1 Reserved U08 1
W2 Mode = 0xff (response) U08 1
W3 Error Code (0=no error) U16 2
CKSM Checksum U08 1
ETX 03 (hex) U08 1