P81 Passcode FUN 16
LED Display LCD Display
Description The MX
2
supports a 4-digit passcode. When the passcode is set, parameters may not be changed.
The MX
2
provides a means of locking parameter values so that they may not be changed. Once locked, the
parameters values may be viewed on the display, but any attempt to change their values by pressing the [UP]
or [DOWN] keys is ignored.
Viewing the Passcode parameter indicates whether or not the parameters are locked. If they are locked, the
Passcode parameter displays “On”. If they are not locked, the Passcode parameter displays “Off”.
To lock the parameters, press the [ENTER] key while viewing the Passcode parameter. This allows entry of a
4-digit number. Press the [UP] or [DOWN] keys and [ENTER] for each of the four digits. After entering the
fourth digit, the number is stored as the passcode and the parameters are locked.
Once parameters are locked, the same 4-digit number must be re-entered into the Passcode parameter in order
to unlock them. Any other 4-digit number entered will be ignored.
When a passcode is set and an attempt is made to change a parameter through the display/keypad, the [UP]
and [DOWN] keys simply have no effect. When a passcode is set and an attempt is made to change a
parameter through Modbus, the MX
2
returns an error response with an exception code of 03 (Illegal Data
Value) to indicate that the register can not be changed.
LED Display The following steps must be performed to set a passcode using the LED Display:
1. At the default meter display, press the [PARAM] key to enter the parameter mode.
2. Press the [UP] or [DOWN] keys to get to the Passcode parameter (P81 / FUN 16).
3. Press the [ENTER] key. “Off” is displayed to indicate that no passcode is currently set.
4. Press the [UP] or [DOWN] keys and [ENTER] for each digit to be defined, select a value
from 0000 to 9999 starting at the most significant digit.
5. Press the [ENTER] key to set the passcode.
The following steps must be performed to clear a passcode.
1. At the default meter display, press the [PARAM] key to enter the parameter mode.
2. Press the [UP] or [DOWN] keys to get to the Passcode parameter (P81 / FUN 16).
3. Press the [ENTER] key. “On” is displayed to indicate that a passcode is presently set.
4. Press the [UP] or [DOWN] keys and [ENTER] after each digit to select the previously set
passcode value.
5. Press the [ENTER] key. The passcode is then cleared.
129
6 - PARAMETER DESCRIPTION
FUN: Passcode
16 Off
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