Russound CAS44 Manual page 31

8 Displaying a String
Since the keypad contains a text display, we've provided a message that will allow you to send
text messages to All Keypads simultaneously or a Specific Keypad individually.
"Alignment" – When sending a message to display text on a Keypad the first Data byte sets
your Alignment (0x00 = Centered, 0x01 = Left justified).
"Flash Time" – Messages can be displayed constant or they can be flashed on the display for a
brief time. When sending a message to display text on a Keypad the second and third Data bytes
set the Flash Time. Flash Time defines how long the string is displayed. This is measured in
10ms increments with a value of 0x00 being constant.
"Null character" – A value of 0x00 used as a Data byte will be a text character of Null. A Null
text character is always used after the last text character in the display string. With a 12
character text message you would use a Null character as the 13
character is also used for each unused text character at the end of the text display message if the
maximum number of Data bytes are not all used.
8.1 On All Keypads
The following example shows how to display a text message on All Keypads (or other devices
with a text display) in the system.
Byte # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Value F0 7F 00 00 00 00 70 00 02 01 01 00 00 00 01 00 10 00 ## ## ## ## ## ##
Byte # 25 26 27 28 29 30 31 32 33 34 35 36
Value ## ## ## ## ## ## ## ## ## ## xx F7
cc = Controller Number -1 (0x7F = All Devices = All Keypads)
zz = Zone Number -1
kk = Keypad Number -1
xx = Checksum
Byte #19 = Alignment (0x00 = Centered, 0x01 = Left justified)
Byte #20 = Low Byte of Flash Time
Byte #21 = High Byte of Flash Time
Byte #22 – #34 = ASCII text characters (Section 11 ASCII Character Set)
8.2 On A Specific Keypad
The following example shows how to display a text message on a Specific Keypad in the system.
This is accomplished by setting the Target Device ID for the particular keypad in question.
Byte # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Value F0 cc zz kk 00 00 70 00 02 01 01 00 00 00 01 00 10 00 ## ## ## ## ## ##
Byte # 25 26 27 28 29 30 31 32 33 34 35 36
Value ## ## ## ## ## ## ## ## ## ## xx F7
cc = Controller Number -1
zz = Zone Number -1
kk = Keypad Number -1
xx = Checksum
th
text character. A Null
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