Vaisala HMT140 Guide de l'utilisateur télécharger pdf (Page 42)

HMT140 Function Modes

34 VAISALA

When new activity occurs, the HMT140 will wake again,

connect then go back to sleep after five seconds.

Transmitter Mode

When the HMT140 is powered on and the HMT140

Configuration Cable is not plugged into it, data is transmitted

according to the transmit settings.

in Transmitter mode, the HMT140 spends most of its time in

a very low power state (sleep). When a transmit period is due,

it powers up the radio, attempts to link to the specified

wireless network, transmits its data and then goes back to

sleep. The HMT140 transmits based on the configured

transmit period or when it is entering an alarm state.

Transmission of Data

The HMT140 will go through the following steps in order to

connect to a network and deliver data:

1 Associates with the network.

2 HMT140 authenticated by the network (depends on the

type of security).

3 Requests IP from DHCP Server (if set to dynamic IP)

4 HMT140 receives request from Name Server IP address

of hostname (if a hostname is used for the Destination

address and DNS Server specified).

5 Sends data.

6 viewLinc returns acknowledgement.

Transmit Attempts

The HMT140 will initiate a Transmit Attempt repeatedly

(typically every 30 seconds) until either an acknowledgement

is received from the host, or the number of tries has been

exhausted. It follows this transmission mechanism both

when the transmit period arrives and for alarm attempts.

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Vaisala HMT140 Guide de l'utilisateur Page 42