Hach-Lange DR 3900 User Manual - Manual (Page 40)

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Standard programs
5. Select Fix to configure the IP address.
6. Press IP address and enter the address.
In conjunction with the IP address of an instrument, the subnet
mask establishes which IP addresses are located within the local
network.
7. Press Subnet Mask and enter the address.
A Gateway enables data communication in networks that are
based on varying protocols.
8. Press Default Gateway and enter the address.
9. Press OK to confirm the entry.