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Page 16 NDA-30115 Revision 1.0
Architecture Property Management System - Communication Interface
Notes:
• a: Preparation for reception complete.
• b: Reception impossible.
• c: Requests for preparation for reception (the PMS should not request this).
• d: Transmitted up to 21 times.
• e: Aborted at 22nd time.
• f: Transmitted up to 7 times.
• g: Aborted on the 8th time.
• h: Message is received normally and preparation for next reception is complete.
• i: Error found in message.
• j: Interruption.
• k: Information to be transmitted is present.
• l: Information to be transmitted is absent.
• m: Retransmission of message.
Table 2-8 Data Transmission Sequence (2 of 2)
Status EOT TTD WACK (Timeouts)
(Transmis-
sion Request)
Neutral (A) ENQ -> (D)
Waiting for
STX (B)
-> (A) d: NAK ->
(B)
e: EOT ->
(A)
EOT -> (A)
(25 sec)
Waiting for
ETX, CRC
(C)
-> (A) EOT -> (A)
(25 sec)
Waiting for
ACK after
start
sequence
(D)
-> (A) d: ENQ ->
(D)
e: EOT ->
(A)
d: ENQ ->
(D)
e: EOT ->
(A)
f: ENQ ->
(D)
g: EOT ->
(A)
Waiting for
ACK after
message (E)
-> (A) d: ENQ ->
(D)
e: EOT ->
(A)
d: ENQ ->
(D)
e: EOT ->
(A)
f: ENQ ->
(D)
g: EOT ->
(A)
(3 sec)