User Reference Manual – DuraPANEL 10.6”
PN: 08140-000 Rev A Page 11
8
Buzzer
Activate buzzer by sending sinus signal to audio channel.
Optimal frequency is 3500 Hz, sound level is controlled by sound volume adjust.
9
Dura Communication protocol
9.1
Message Format
The monitor supports a data rate of 19200 bits per second. Data shall be transmitted with no parity, one start bit, and
one stop bit.
The basic message format is shown below:
ATTN
ADDR
CMD
LEN
IHCHK
DATA
IDCHK
The minimum message length is 7 bytes.
9.2
Attention (ATTN)
This byte identifies the start of a message. The following three values are defined:
ATTN
Description
0x07
Command
0x06
Acknowledge
0x15
Negative Acknowledge
A remote master initiates a command using the 0x07 attention code. The monitor will reply with an acknowledge
(ACK) code if the command was received successfully, or a negative acknowledge (NACK) if the command contained
errors.
Note that the monitor will acknowledge messages, even if it fails to execute the actions contained within. NACKs are
only issued when the message format is corrupted, e.g. invalid checksums.
9.3
Address (ADDR)
This byte is used to identify and address individual monitors. In a multi-slave configuration, the master can target each
monitor individually, in which case the addressed monitor will reply with either an ACK or a NACK.
The remote master can address all monitors simultaneously using the broadcast address. In this case the monitors will
not reply.
ADDR
Description
0x00::0xFE Individual address space.
0xFF
Broadcast address.
