NavCom LAND-PAK Rev.N - Manual (Page 91)

Technical Reference Manual Rev. N
Blk = All; Blu = IOP w/Internal Radio ; Red = IOP & LBM ; Grn = Engine only
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0x7b - IOP Ping
This block is used to determine connectivity to the IOP. There are certain commands (such as
MMC format and MMC status) that can take 10 seconds or longer for a response. The user can
send this message for an immediate response during these waits. The user should set the
ACK/NAK bit in W1 to get a reply. The reply will be a Message 0x7b with W2 = 0xff. If a mode
other than 0x00 or 0xff is specified, and the ACK/NAK bit is set, then the IOP will return a Msg
0x7b with error code 0x30 (NAK_X7B_BadParameter).
Request:
Record
Usage Command - Yes
Response - No Input: check IOP operation;
Output: see next table
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 7b (hex) U08 1
Length 0x0006 U16 2
W1
Command Action
B2=1: ACK/NAK desired
U08 1
W2 Mode = 0x00 (ping request) U08 1
CKSM Checksum U08 1
ETX 03 (hex) U08 1
Response:
Record
Usage Command - No
Response - Yes Input: see previous table;
Output: reports the current operation status
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 7b (hex) U08 1
Length 0x0008 U16 2
W1 Reserved U08 1
W2 Mode = 0xff (ping response) U08 1
W3 Error code (0=no error) U08 1
CKSM Checksum U08 1
ETX 03 (hex) U08 1