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Matrix ETERNITY NE System Manual
The ETERNITY NE will make 3 tries (default) to send the message for Data Transfer Retry Count - on
Negative Response. If the ACK is still not received from the CAS, the ETERNITY will proceed to the next
message.
No Response from the CAS
After sending the message the ETERNITY NE will wait for the response to Data Timeout time. If no response
is received from CAS for the sent message, the ETERNITY NE will log this message in the System Fault Log
and look for new message to be sent to CAS.
Link Control Characters
3. Hobic
Protocol for transfer of messages from ETERNITY to CAS.
Case 1:
Positive Response from the CAS
ETERNITY to CAS
CAS to ETERNITY
<LF>-message-<CR> (wait for Response to Data Timeout
(sec), default 5 sec)
(no response)
After 3 seconds, (Data Transfer Retry Timer on No
Response), retransmit
<LF>-message-<CR> (wait for Response to Data Timeout
(sec), default 5 sec)
After 3 seconds (Data Transfer Retry Timer
on No Response), retransmit
<LF>-message-<CR> (wait for Response to Data Timeout
(sec), default 5 sec)
After 3 seconds (Data Transfer Retry Timer on No
Response), retransmit
<LF>-message-<CR> (wait for Response to Data Timeout
(sec), default 5 sec)
Control Char.
Meaning
Character ASCII Value
ACK
Positive Acknowledgement from CAS
HEX 06
NAK
Negative Acknowledgement from CAS
HEX 15
LF
This marks the beginning of the message.
Start of the Message (Line Feed)
HEX 0A
CR
End of the Message
HEX 0D (Carriage Return)
ETERNITY to CAS CAS to ETERNITY
SOM-(tex)-EOM >
< ACK
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