Property Management System - Communication InterfaceArchitecture
Timers and | Retransmission Counts |
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Counters |
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| Meaning | Count |
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| The number of retransmissions of the start sequence when there is no | 7 | |
| answer after transmitting the start sequence. |
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| The number of retransmissions of the start sequence when NAK is | 7 | |
| received after transmitting the start sequence. |
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| The number of transmitting ENQs when WACK is received after the | 15 | |
| transmission of an information block |
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| The number of transmitting ENQs when there is no answer after the | 7 | |
| transmission of an information block. (3 second intervals) |
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Timer Values
Table
Party | Starting Condition | Timer value | |
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NEAX | Waiting for a start sequence answer. | 1 | |
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| Waiting for STX after transmitting the start sequence ACK. | 20 | |
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| Waiting for data reception complete (waiting for ETX, CRC). | 20 | |
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| Waiting for an answer after the transmission of a message. | 1 | |
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PMS | Waiting for a start sequence answer. | 3 | |
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| Waiting for STX after transmitting the start sequence ACK. | 25 | |
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| Waiting for data reception complete (waiting for ETX, CRC). | 25 | |
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| Waiting for an answer after the transmission of a message. | 3 | |
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| Page 17 |