Baumer EXG50c Manuale d'uso - Pagina 30

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Figure 41 ►

DHCP Request

(broadcast)

DHCP Lease Time:

The validity of DHCP IP

addresses is limited by the

lease time. When this time

is elapsed, the IP configu-

ration needs to be redone.

This causes a connection

abort.

Figure 42 ►

DHCP

Acknowledge-

ment (unicast)

LLA:

Please ensure operation

of the PC within the same

subnet as the camera.

▪ DHCP Request

Once the client has received this DHCPOFFER, the transaction needs to be con-

firmed. For this purpose the client sends a so called DHCPREQUEST broadcast to the

network. This message contains the IP address of the offering DHCP server and

informs all other possible DHCPservers that the client has obtained all the necessary

information, and there is therefore no need to issue IP information to the client.

▪ DHCP Acknowledgement

Once the DHCP server obtains the DHCPREQUEST, a unicast containing all neces-

sary information is sent to the client. This message is called DHCPACK.

According to this information, the client will configure its IP parameters and the pro-

cess is complete.

5.4.3 LLA

LLA (Link-Local Address) refers to a local IP range from 169.254.0.1 to 169.254.254.254

and is used for the automated assignment of an IP address to a device when no other

method for IP assignment is available.

The IP address is determined by the host, using a pseudo-random number generator,

which operates in the IP range mentioned above.

Once an address is chosen, this is sent together with an ARP (Address Resolution Pro-

tocol) query to the network to to check if it already exists. Depending on the response,

the IP address will be assigned to the device (if not existing) or the process is repeated.

This method may take some time - the GigE Vision

connection in the LLA should not take longer than 40 seconds, in the worst case it can

take up to several minutes.

5.4.4 Force IP

Inadvertent faulty operation may result in connection errors between the PC and the camera.

In this case "Force IP" may be the last resort. The Force IP mechanism sends an IP ad-

dress and a subnet mask to the MAC address of the camera. These settings are sent

without verification and are adapted immediately by the client. They remain valid until the

camera is de-energized.

*) In the GigE Vision

standard, this feature is defined as "Static IP".

standard stipulates that establishing