KUUMIC OY
NETWORK CONTROL
MIMIC BOARD
10
3.2 WRITE LEDs
Write operations are done by using "unprotected block write"- or "protected
block write"-commands.
The RKU5 handles both "unprotected" and "protected" operations in a similar
way. Only word addresses are used.
The data bit 0 represents the LED state, value 0 means the LED is off (not
illuminated) and value 1 means the LED is on (illuminated).
The data bit 1, value 1 sets the LED to blink appr. twice a second.
The RKU5 ingnores data bits 2 through 15 in write messages.
Multiple LED states can be written by one command. The only limit is set
by the ANSI X3.28 protocol, which limits the length of the data field.
Example of write message:
address= 6201 (decimal)
data = 0001
The address above selects the LCM, which is connected to the bus cable
number 3 (bus cable connected to 3th Display Bus Driver board) and has
the card-number-select- jumper in position 8 (card number is 8). The LED
connected to pin 11 on the selected LCM will be illuminated after the
message has been sent. The data value 2 sets the same LED to blink
approximately twice a second.