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11
Serial Communication (SCOM) Interface
Communication Interface
IND100084-12
“BRT” - User Brightness Control
This command is sent to the unit to command the backlight brightness control setting.The brightness value shall be sent
as one byte in the DATA eld. A setting of 0x00 will indicate off. A setting of 0xFF (255 in value) will indicate maximum
brightness. Intermediate values will control brightness over the range from minimum to maximum luminance.
LEN = one data byte.
After any power cycle the BRT will be set to 100%.
If the data checksum is valid and the brightness was set, the unit will reply to this command with an ACK attention code.
The DATA eld in the reply shall indicate the resulting brightness control setting. If an invalid checksum was received
and the message was not Broadcast and RS-485, the unit will reply with an NAK attention code. The DATA eld in the
reply will indicate the current brightness control setting.
Example:
If BRT is 100%, the user can adjust the brightness from 0-100%. If the BRT is set to 60%, the visual brightness is set to
60%. The user can adjust the brightness from 0-100% within the 60% set by BRT. If the user sets the potensiometer to
half, the visual brightness will be 30% (half of 60%). If BRT is set back to 100%, the visual brightness will be 50% (half
of 100%).
Command to set 60% Brightness:
0x07 0xFF 0x42 0x52 0x54 0x01 0x10 0x99 0x66
Acknowledge was set to 60% Brightness:
0x06 0xFF 0x42 0x52 0x54 0x01 0x11 0x99 0x66
Negative Acknowledge 40% Brightness:
0x15 0xFF 0x42 0x52 0x54 0x01 0x02 0x66 0x99
“BZZ” - Buzzer Control
This command is sent to the unit to control buzzer on/off if there is a buzzer present. LEN = one data byte.
0x00
Turn the buzzer off
0xFF
Turn the buzzer on
If the data checksum is valid, the unit will reply to this command with an ACK attention code. The DATA eld will indicate
the buzzer state. If an invalid data checksum was received and the message was not broadcast and RS-485, the unit
will reply with a NAK attention code and the current control setting.
Example:
Command to set Buzzer Enable: 0xFF
0x07 0xFF 0x42 0x5A 0x5A 0x01 0x02 0xFF 0x00
Acknowledge Buzzer status was set to Enable: 0xFF
0x06 0xFF 0x42 0x5A 0x5A 0x01 0x03 0xFF 0x00