NEC NDA-30115-001 manual Neutral a ACK0 NAK ENQ Waiting for ACK last, Stx B, Etx, Crc

Property Management System - Communication Interface Architecture

Transmission

Sequence

Table 2-7 Data Transmission Sequence (1 of 2)

Status	ENQ	STX	ETX,	ACK0/	NAK
			CRC	ACK1
Neutral (A)	a: ACK0 ->
	(B)
	b: NAK ->
	(A)
	c: ENQ ->
	(D)
Waiting for	(ACK last	-> (C)
STX (B)	received) ->
	(B)
Waiting for	f: NAK ->		h: ACK0/1
ETX, CRC	(B)		i: NAK
(C)	g: EOT ->		c: RVI
	(A)		j: EOT
			-> (A)
Waiting for	f: ENQ ->	d: ENQ ->	d: ENQ ->	Message ->	f: ENQ ->
ACK after	(D)	(D)	(D)	(E)	(D)
start	g: EOT ->	e: EOT ->	e: EOT ->	j: EOT ->	g: EOT ->
sequence	(A)	(A)	(A)	(A)	(A)
(D)
Waiting for	d: ENQ ->	d: ENQ ->	d: ENQ ->	k: Message	m: Mes-
ACK after	(D)	(D)	(D)	-> (E)	sage -> (E)
message (E)	e: EOT ->	e: EOT ->	e: EOT ->	l: EOT ->	j: EOT ->
	(A)	(A)	(A)	(A)	(A)

NDA-30115 Revision 1.0 Page 15