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3-5
Section
Using a Memory Unit
34
2. Switch the NT21 power ON.
The screen data is automatically written into the Memory Unit. The screen
data in the NT21 is preserved.
The messages Preparing, Transmitting, Verifying, and Finished are dis-
played on the screen in accordance with the progress of data writing.
At the same time, the progress of the data writing status is displayed by the
means of the number of bytes and blocks (1 bank = 16 block = 1024k byte).
RUN Indicator operates as follows according to the processing status.
Preparing
: flashes at intervals of 1 second
Transmitting
: flashes at intervals of 0.5 second
Verifying
: flashes at intervals of 0.5 second
Finished
: lights up
3. Switch the NT21 power OFF, remove the Memory Unit.
To operate NT21 continuously, switch the NT21 power back ON.
In this mode, the system program or screen data in the Memory Unit is forcibly
written to NT21 irrespective of the setting status of the NT21.
Since data transmission by this method is faster than when the NT Support Tool
or system installer is used, it can save a lot of time. When transmitting the same
system program or screen data to multiple NT21, this mode becomes conve-
nient.
Reference: When data is written to the NT21, the data that has been stored up until that point
is lost. When the system program is changed, the operation of NT21 also chan-
ges.
Method of Execution
Use the following procedure to write the screen data in the Memory Unit to the
NT21 by automatic transmission.
1, 2, 3...
1. Check that the NT21 power is OFF, then set the DIP switches on the Memory
Unit as follows after installing Memory Unit to NT21.
SW2-4 ON: System/Screen transmitted simultaneously
OFF: System/Screen not transmitted simultaneously
SW1-4 ON: System program
OFF: Screen data
SW2-3 ON: Bank 1
OFF: Bank 0
4
3
2
1
ON
SW1
SW2
4
3
2
1
ON
It is not strictly necessary to set SW2-2 to OFF (to disable writing to the
Memory Unit), but it is recommended to do so to avoid loss of data in the
event of operating errors.
Reference:
S
Setting SW2-4 to ON (System/Screen transmitted simultaneously) disables
the setting of SW1-4.
S
Setting SW2-4 to ON (System/Screen transmitted simultaneously) disables
the setting of SW2-3. In this case, the data transmission becomes possible
only if the data inside Memory Unit is in either of following combinations.
Bank 0: system program, Bank 1: other than system program
Bank 0: other than system program, Bank 1: system program
If the combination is not as listed above, a data transmitting error occurs.
S
When writing the system program into the NT21, the type of system program
inside Memory Unit and the PT model must correspond.
Writing Screen Data to
the PT Using Automatic
Transmission (Memory
Unit to PT)