NEC NDA-30115-001 manual Timers Retransmission Counts Counters, Timer Values

Property Management System - Communication InterfaceArchitecture

Timers and		Retransmission Counts
Counters
		Table 2-9 Retransmission Counts
		Meaning	Count
	The number of retransmissions of the start sequence when there is no		7
	answer after transmitting the start sequence.
	The number of retransmissions of the start sequence when NAK is		7
	received after transmitting the start sequence.
	The number of transmitting ENQs when WACK is received after the		15
	transmission of an information block
	The number of transmitting ENQs when there is no answer after the		7
	transmission of an information block. (3 second intervals)

Timer Values

Table 2-10 Timer Values

Party	Starting Condition	Timer value
		(seconds)
NEAX	Waiting for a start sequence answer.	1
	Waiting for STX after transmitting the start sequence ACK.	20
	Waiting for data reception complete (waiting for ETX, CRC).	20
	Waiting for an answer after the transmission of a message.	1
PMS	Waiting for a start sequence answer.	3
	Waiting for STX after transmitting the start sequence ACK.	25
	Waiting for data reception complete (waiting for ETX, CRC).	25
	Waiting for an answer after the transmission of a message.	3

NDA-30115 Revision 1.0 Page 17