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Command format is shown below:
Module Type
Module
Command
Data Field
Manual 19854 Rev. D
ECN 50523
Start
NAK
Byte
(0x15)
(0x02)
The Format of a NAK Message
Reason
Description
Byte
'C'
Check sum error in message received from external
host.
'D'
Data overflow error – the size of the data field was
larger than the message buffer. The buffer is 95
bytes long.
'F'
A framing error occurred – ETX was received before
it was expected.
'I'
Check sum error occurred while communicating
with internal module.
'T'
Time-out – message not sent, rack/slot address
may be incorrect.
NAK Reason Bytes
Module
Type
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.
Reason
End
Byte
Byte
(0x030
Module
Data Field
Command
443B101/443B102
Checksum
8
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