PR 5220 Instrument Manual Commissioning
Sartorius EN-43
4.3.2.2 DHCP
Normally, DHCP servers are provided only in IT-supported company networks and not on locally (directly)
connected notebooks/PCs or notebooks.
Nevertheless, ’DHCP’ must be activated on the notebooks/PC. The ’DHCP’ devices find each other because they
fall into a so-called auto-IP address in the range 169.254.0.1…169.254.255.254 with the associated auto-
subnet mask 255.255.0.0 after a cyclical automatic ’DHCP’ server search run due to time overflow
(2…3 minutes).
When connecting the IT/DHCP network cable temporarily from the PC to a device, the
DHCP server is lost and the PC returns to the auto-IP address within approx. 2 minutes.
Reason: The DHCP server/client relationship is checked cyclically in 2…3-minute intervals.
Example
If the search time is exceeded (due to the result ’no server found’), the PR 5220 is provided with an IP address
(e.g. 169.254.0.123) automatically. The same applies to the notebook/PC (e.g. 169.254.0.54). These IP addresses
are different on both sides:
- equal regarding the first 3 octets of the IP address (e.g. network ID 169.254.)
- different in the last 2 octets of the IP address (e.g. host ID 0.123.)
4.3.2.3 Host Name (device name)
With DHCP applications, this must be a unique name.
If own names are defined (host name is editable)
- the same host name must not exist twice within the network ID.
Correct is e.g. host name device 1: PR 5220 scale1, device 2: PR 5220 scale2
Always correct is the ’default’ with PR 5220-8BB499, whereby the last 3 bytes of the MAC-ID are unique.
- there is a limitation to 2…24 characters.
Permitted are
- letters A…Z, a…z
- digits 0…9, which must not be the first or last character
- character "-", which must not be the first or last character
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