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8.6.3.5.1.5 below;
b) if the station has no message to send, it shall send
EOT, and master status shall revert to .the control
station.
8.6.3.5.1.4 If the control station detects an invalid or no
response resulting from a poll, it shall terminate by sending
EOT prior to resuming polling or selection.
8.6.3.5.1.5 Selection shall be accomplished by the designated
mastcr station sending a selection supervisory sequence
consisting of a prefix identifying a single station and ending
in ENQ.
8.6.3.5.1.6 A station detecting its assigned selection
supervisory sequence shall assume slave status and send one
of two replies:
a) if the station is ready to receive, it shall send a prefix
followed by ACK. Upon detecting this reply, the
master station shall either select another station or proceed
with message transfer;
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
b) if the station is not ready to receive, it shall send a 8.6.3.5.3.4 If the master station receives a negative reply
prefix followed by NAK and thereby relinquish slave (NAK) or, after N 2 0 repeat attempts, no reply, it shall repeat
status. If the master station receives NAK, or no reply, that transmission to the appropriate slave stations at a later
it shill either select another or the same tributary opportunity.
station or terminate;
8.6.3.5.3.5 After all messages have been sent and
c) it shall be permissible for N retries (N 2 0) to be made delivery verified, the master station shall proceed with link
to select a station for which NAK, an invalid reply, or termination.
no response has been received.
8.6.3.5.1.7 If one or more stations have been selected 8.6.3.5.4 LINKT E R M I ~ A TPIR~O~C EDURE
and have properly responded with ACK, the master station
shall proceed with message transfer. 8.6.3.5.4.1 The terminate function, negating the master
or slave status of all stations and returning master status to the
control station, shall be accomplished by the master station
8.6.3.5.2 MESSAGE TRANSFER PROCEDURE transmitting EOT.
serie8s. 6o.f3 .m5.e2s.s1a geTs,h ew imtha sotre rw sittahtoiount hsheaaldl insegns dt oa tmhee sssealgecet eodr 8.6.3.6 Description of system category B. System cateslave
station(s). gory B is one in which two stations are on a point-to-point,
full-duplex link and each station has the capability to maintain
8.6.3.5.2.2 The transmission of a message shall:
a) begin with:
- SOH if the message has a heading,
- STX if the messagc has no heading;
b). be continuous, ending with ETX, immediately
followed by a block check character (BCC).
8.6.3.5.2.3 After transmitting one or more messages, the
master station shall verify successful delivery at each selected
slave station.
concurrent master and slave status, i.e. master status on its
transmit side and slave status on its receive side and both
stations can transmit simultaneously.
8.6.3.6.1.1 To establish the link for message transfers
(from the calling to the called station), the calling station shall
request the identity of the called station by sending an identification
supervisory scquence consisting of a DLE character
followed by a colon character, an optional prefix, and ENQ.
8.6.3.6.1.2 The called station, upon detecting ENQ, shall
send one of two replies:
8.6.3.5.3 DELIVERVYE RIFICATION PROCEDURE
8.6.3.5.3.1 The master station shall send a delivery
verification supervisory sequence consisting of a prefix identifying
a single slave station and ending in ENQ.
8.6.3.5.3.2 A slave station detecting its assigned delivery
verification supervisory sequence shall send one of two
replies:
a) if the slave station properly received all of thc transmission,
it shall send an optional prefix followed by
ACE,
b) if the slave station did not receive all of the transmission
properly, it shall send an optional prefix
followed by NAK.
8.6.3.5.3.3 If the master station xeceives no reply or an
invalid reply, it shall request a reply from the same or another
slave station until all selected stations have been properly
accounted for.
a) if ready to receive, it shall send a sequence consisting
of a DLE followed by a colon, a prefix which includes
its identity and ended by ACKO (see 8.6.3.6.2.5
below). This establishes the link for messa-g e transfers
from the calling to the called station;
b) if not ready to receive, it shall send the above
sequence with the ACKO replaced by NAK.
8.6.3.6.1.3 Establishment of the link for message
transfers in the opposite direction can be initiated at any time
following circuit connection in a similar manner to that
　
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