Yokogawa BT200 User Manual
Field Guide
Write Protection
Brain Communication
The Brain EJX offers Hardware and
Software (Password) Write Protection for
all input parameters and Software Protection
for the zero-adjustment screw. These great
features allow the customer to protect the
settings in the transmitter and offer the
following features:
• Hardware Write Protection in the
form of a switch on the CPU
assembly board.
• Software Write Protection in the
form of a Password feature.
The Password feature can be
turned on & off.
Each transmitter can have a
unique password.
The Password can be any 8-digit
alphanumeric string
If you forget your password, an
override password is preprogrammed into the transmitter.
• The Zero-adjustment screw can also
be Software protected.
Section 1.0 Hardware Write Protection
The Brain EJX transmitter has a Write
Protection (WR) switch located on the CPU
Assembly Board next to the Burn Out (BO)
switch. * (See Figure 1) When the WR
switch is in the “D” (Disabled) position; the
transmitter will not allow parameter changes
through the use of a handheld terminal or
some other communication method. When
the WR switch is in the “E” (Enable)
position, communication will be allowed.
* Refer to the exploded view of the transmitter in the
Instruction Manual (IM) for the location of the
Assembly Board within the EJX transmitter.
CPU
Figure 1
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Field Guide
Write Protection
Brain Communication
Section 2.0 Software Write Protection
The Brain EJX transmitter offers Software
Write Protection in the form of a Password.
Section 2.1 Activating the Password
Function and setting the password.
The password function is activated when a
new password is entered into the D57: NEW
PASSWORD parameter. (See Figure 2)
Using your BT200 Communicator:
1. Scroll to the D: Aux Set 1 Menu.
2. Scroll down to D57: NEW
PASSWORD.
3. Press Enter.
4. Enter your 8-digit password.
5. Press ENTER twice
6. Confirm the new password is correct
and press F4 (Ok).
When this process is complete the status of
parameter D55: WRT PROTECT becomes
‘Yes’. This indicates that this transmitter is
password protected.
Note: If the status of parameter D55: WRT
PROTECT is ‘NO’, then the Password
Function is not activated.
Figure 2
Section 2.2 Entering a Password to Enable
Parameter Change.
(See Figure 3)
Using your BT200 Communicator:
1. Scroll to the D: Aux Set 1 Menu.
2. Scroll down to D56: WRT ENABLE
3. Enter the Password.
4. Press ENTER twice
5. Press F4 (Ok)
Once F4 (Ok) is pressed, Parameter changes
are available for
10 minutes.
After the 10 minutes has elapsed, the
password must be re-entered to continue to
make parameter changes.
Figure 3
Section 2.3 De-activating the Password
Function.
Enter your password to allow parameter
changes (Section 2.2). During the 10 minutes
parameter changes are allowed, follow the
procedure in Section 2.1. When prompted to
enter the new password, enter eight spaces.
Complete the procedure.
When this process is complete the status of
parameter D55: WRT PROTECT becomes
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