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NEC NDA-30115-001 Manual Do Utilizador

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NDA-30115   Revision 1.0
Page 17
Property Management System - Communication Interface
Architecture
Timers and 
Counters
Retransmission Counts
Timer Values
Table 2-9  Retransmission Counts
Meaning
Count
The number of retransmissions of the start sequence when there is no 
answer after transmitting the start sequence.
7
The number of retransmissions of the start sequence when NAK is 
received after transmitting the start sequence.
7
The number of transmitting ENQs when WACK is received after the 
transmission of an information block
15
The number of transmitting ENQs when there is no answer after the 
transmission of an information block. (3 second intervals)
7
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