443B101/443B102 8
Manual 19854 Rev. D
ECN 50523
The Format of a NAK Message
Check sum error in message received from external
host.
Data overflow error – the size of the data field was
larger than the message buffer. The buffer is 95
bytes long.
A framing error occurred – ETX was received before
it was expected.
Check sum error occurred while communicating
with internal module.
Time-out – message not sent, rack/slot address
may be incorrect.
NAK Reason Bytes
Command format is shown below:
Three ASCII printable characters. This field identifies the type of module the command
is meant for. For the 443B series, this will be either C01 (for 443B101) or C02 (for
443B102).
Four printable ASCII characters. This field identifies the command for the module.
Contains any data associated with the command.
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