1522LR comes from the factory with the default IP address of 10.2.150.175.

If the IP has been set to something else and one does not know the IP address of a 1522LR, one of two things can be done: (1) either assign it a temporary IP address to it or (2) reset it to the factory default IP address.

To assign a temporary address 

 The device will retain the temporary address until power is reset to it.  How to set it depends on the host system you are working from.

Windows:

Open a Command Prompt (select START, then RUN, then type “cmd”).  Note: for Vista, the Command Prompt should be run as administrator (select Start, then type “cmd” and right click on “cmd” and select “Run as administrator”).

Type:

     arp -s {new IP address} {serial number of the 1522LR }

     Note: IP address format is xxx.xxx.xxx.xxx
     Serial number format is ss-ss-ss-ss-ss-ss (I.e., the MAC address)
     For example, to set a IED1522LR (with serial number 00-0C-C8-01-00-01) to 10.10.10.40 the following command would be used:

     arp -s 10.10.10.40 00-0c-c8-01-00-01

Next, type:

     ping -l 102 {new IP address}

     (The character after the dash is a lowercase “L”.)  For example, if the new IP address is 10.10.10.40, the following command would be used:

     ping -l 102 10.10.10.40

Linux/Unix:
Open a terminal, change to root user (su -, then enter root password).

Type:

     arp -s {new IP address} {serial number of the 1522LR }

     Note: IP address format is xxx.xxx.xxx.xxx
     Serial number format is ss:ss:ss:ss:ss:ss  (i.e., a MAC address)
     For example, to set the 1522LR (with serial number 00-0C-C8-01-00-01) to 10.10.10.40 the following command would be used:

     arp -s 10.10.10.40 00:0c:c8:01:00:01

Next, type:

     ping -s 102 {new IP address}

     For example, if the new IP address is 10.10.10.40, the following command would be used:

     ping -s 102 10.10.10.40

Mac OS X:
Open a terminal.  Note that the terminal is in the “Utilities” directory, which is in the “Applications” directory.

Type:

     sudo arp -s {new IP address} {serial number of the 1522LR }

     Note: Administrator password is required.
     IP address format is xxx.xxx.xxx.xxx
     Serial number format is ss:ss:ss:ss:ss:ss (i.e., the MAC address)
     For example, to set a WebRelay-Dual™ (with serial number 00-0C-C8-01-00-01) to 10.10.10.40 the following command would be used:

     sudo arp -s 10.10.10.40 00:0c:c8:01:00:01

Next, type:

     ping -s 102 {new IP address}

     For example, if the new IP address is 10.10.10.40, the following command would be used:

     ping -s 102 10.10.10.40

 Restoring Factory Default Settings

In the event that the IP address or passwords are forgotten, the 1522LR may be restored to its original factory default settings. To do this, first remove the power from the unit. Next, carefully insert a thin object (such as a toothpick) through the small hole in the bottom of the unit to press the small button that is located inside the unit. When the object is inserted, a tactile feel can be detected as the button is depressed. While holding the button down, apply power and wait for about 10 seconds. After about 10 seconds, release the button. Now all settings will be back to the original factory defaults. 
CAUTION: DO NOT USE METAL OBJECTS FOR THIS FUNCTION.