NavCom LAND-PAK Rev.N User Manual
Page 30
Technical Reference Manual Rev. N
Blk = All;
Blu = IOP w/Internal Radio
;
Red = IOP & LBM
;
Grn = Engine only
28
0x15 - Negative Acknowledge (NAK) - 6 + (n x 2) bytes
This message indicates that the initial inquiry was not acknowledged because of error(s). NAK
words Wn1 and Wn2 are repeated for multiple errors. The maximum number of errors reported
by NAK is six. If the total number of errors is greater than six, then the first five will be reported
and a “Too many errors” Error ID (0xFF) will be reported as the sixth error. ACK word W2 and
NAK word Wx are used to identify which port is currently responding to a data request.
Record
Usage
Command - No
Response - Yes
Input: Not used;
Output: reports rejected input commands by ID
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
15
(hex)
U08
1
Length 6 + (n x 2) bytes
U16
2
W1
Command ID Echo
U08
1
Repetitive Blocks (up to 6x maximum)
Wn1
Error
ID
U08[]
1[]
Wn2
Error
Description
U08[]
1[]
End Repetitive Blocks
W2
Responding Physical Port
(See Message 0x1a)
0 = Port A
1 = Port B
U08
1
CKSM Checksum
U08
1
ETX
03
(hex)
U08
1
Wn1 & Wn2 Record the NAK ID and report to NavCom Product Support at
http://www.navcomtech.com/Contact/ContactSupport.cfm