Aim MIL-STD-1553 - Figure 12.1-6 Target S;W Status and Acknowledge Interpretation Message

MIL-STD-1553 Reference Manual
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Chapter 12 – Troubleshooting
Figure 12.1-6. Upon completion of the display of this error message, Target communication
will be aborted and switched automatically into emulation mode to prevent further Target
I/O errors. The library should then be closed and opened again with a call to the ApiCmdReset
function to force initial states on the Target hardware and Target S/W.
Figure 12.1-6 Target S/W Status and Acknowledge Interpretation Message
(16) Error message CMD: xxxxxxxx h ACK: yyyy h!
Where:
(16) Error message is
“(1) General I/O Error”
“(2) ACK returned”
“(3) ACK2 returned”
“(4) NAK returned”
“(5) Acknowledge Error”
“(6) Target Communication closed”
“ERROR NO: (a) “ for unknown error code
xxxxxxxx is an 8 digit hexadecimal number where the first two digits are
associated with the biu number and the last two digits are associated with
the driver command utilized for the function call (See Table 0.2-I)
yyyy is an 4 digit hexadecimal number where the first two digits are associated
with the biu number and the last two digits are 20h (ACK), 22h (ACK2),
24h (No Acknowledge (NAK), or 26h (NAK2).
At this point if the ApiIo function received a status error code from _ApiIo (Target S/W
detected error) then prior to completion of the ApiIo function, an error message “ERROR in
function “ message as shown in Figure 12.1-2 will occur with ApiIo as the function name.
Since the error code is reserved for Target S/W errors, it will be interpreted as (unknown) by the
ApiIo function.