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NDA-30115 Revision 1.0 Page 15
Property Management System - Communication Interface Architecture
Transmission
Sequence
Table 2-7 Data Transmission Sequence (1 of 2)
Status ENQ STX
ETX,
CRC
ACK0/
ACK1
NAK
Neutral (A) a: ACK0 ->
(B)
b: NAK ->
(A)
c: ENQ ->
(D)
Waiting for
STX (B)
(ACK last
received) ->
(B)
-> (C)
Waiting for
ETX, CRC
(C)
f: NAK ->
(B)
g: EOT ->
(A)
h: ACK0/1
i: NAK
c: RVI
j: EOT
-> (A)
Waiting for
ACK after
start
sequence
(D)
f: ENQ ->
(D)
g: EOT ->
(A)
d: ENQ ->
(D)
e: EOT ->
(A)
d: ENQ ->
(D)
e: EOT ->
(A)
Message ->
(E)
j: EOT ->
(A)
f: ENQ ->
(D)
g: EOT ->
(A)
Waiting for
ACK after
message (E)
d: ENQ ->
(D)
e: EOT ->
(A)
d: ENQ ->
(D)
e: EOT ->
(A)
d: ENQ ->
(D)
e: EOT ->
(A)
k: Message
-> (E)
l: EOT ->
(A)
m: Mes-
sage -> (E)
j: EOT ->
(A)