Matrix ETERNITY NE - Hobis B; Link Control Characters

Matrix ETERNITY NE System Manual 771
The ETERNITY NE will try to send the message for a maximum of 3 tries. If the message is not transmitted
successfully, the system will drop the message and proceed for the transmission of the next message. Also,
the system will print a System Fault event and the message.
Link Control Characters
2. HOBIS B
Handshaking Parameters for HOBIS B are as below:
Positive Response form the CAS
Negative Response form the CAS
Control
Char.
Meaning
Character
ASCII
Value
ENQ Used to request the status of the CAS HEX 05
ACK Positive Acknowledgement by the CAS (Indicates successful reception of data by
the CAS)
HEX 06
NAK Negative Acknowledgement by the CAS (Unsuccessful reception of data by the
CAS)
HEX 15
STX This marks the beginning of the data transfer. It also starts the accumulation of the
BCC
HEX 02
ETX This is the last data character. Marks the end of the data. It is immediately followed
by the BCC.
HEX 03
BCC This is a 'block check character' used to verify the successful transfer of data
between the systems. BCC is calculated by processing through an accumulatory
by an Exclusive OR operation. The BCC process should start with the character
after the STX character.
Depends on
the data
ETERNITY to CAS CAS to ETERNITY
<LF> -message-<CR>
ACK
ETERNITY to CAS CAS to ETERNITY
<LF>-message-<CR>
NAK
<LF>-message-<CR>
NAK
<LF>-message-<CR>
NAK
<LF>-message-<CR>