Deriving IP Parameters from the MAC Address

Introduction

If no IP parameters are received from the application when the rotary switch is set to Stored or Clear IP positions, the module is configured at power-up with its default IP address. The default IP address for the module is derived from its hardware in accordance with a default IP address format.

Default IP Address Format

The default IP address format is 84.x.y.z:

84: a fixed value
x.y.z: The last three fields in the default IP address correspond to the decimal equivalents of the last three bytes in the MAC address.

Example

For example a device with 00-00-53-12-01-C4 MAC address has the following default IP address: 84.18.1.196 (12 hex = 18 dec, 01 hex = 1 dec, C4 hex = 196 dec).

MAC address

media access control address. A 48-bit number, unique on a network, that is programmed into each network card or device when it is manufactured.