Sleep Notification; Front Panel Display Buffer - Lexicon DC-2 Protocol Manual

Lexicon, Inc.
DC-2/MC-1 Serial Communications Protocol
7.1.1.2 Host Response Expected
Following the transmission of the Wakeup notification DC-2/MC-1 will wait for an ACK.
7.1.1.2.1 Actions to Response Codes
ACK
NAK Error Code

7.1.2 Sleep Notification

By transmitting the Sleep Notification, DC-2/MC-1 indicates the unit is shutting down into a standby mode.
Because the hard power switch could be activated independently of the DC-2/MC-1 system software, hard
power down will not be notified. Acknowledgment of the Sleep Notification is not required. This
notification is primarily for the HOST to know the operating status of the DC-2/MC-1.
7.1.2.1 Notification Packet Description
Application Header:
Command DC_SLEEP
Data Count 0
Application Data:
N/A

7.1.3 Front Panel Display Buffer

DC-2/MC-1 will transmit the front panel display buffer following the update to the DC-2/MC-1 front panel
display. The DC-2/MC-1 front panel display is 2 X 20 ASCII character display. The HOST can control the
operation of this notification message by FPD internal control registers. Individual notifications can be
enabled or disabled and the minimum transmit interval can be adjusted. Transmission of the display buffer
is asynchronous to other host/DC-2/MC-1 communication and will only transmit following the completion
of any communication exchanges in progress or pending. The FPD control register command packets are
described in section 7.3.14 Get FPD Control Registers.
7.1.3.1 Notification Packet Description
Application Header:
Com m and
Data Count
Application Data:
Data[0] - Data[21]
Data[22] - Data[42]
7.1.3.2 Data Description
Line1
Data Type:
Max Length:
Line2
Data Type:
Max Length:
DC-2/MC-1 continues to operate.
DC-2/MC-1 will retransmit the Wakeup Notification until it receives an ACK
or it reaches the RETRANSMIT_COUNT. If the RETRANSMIT_COUNT
is exceeded then DC-2/MC-1 continues to operate.
0x02
0x00
DC_FPD 0x03
42 0x2A
Line1 ch ch ch... 0x00
Line2 ch ch ch ... 0x00
Null(0x00) terminated ASCII character string.
DISP_LINE_LENGTH defined in Appendix E Protocol Constants.
Null(0x00) terminated ASCII character string.
DISP_LINE_LENGTH defined in Appendix E Protocol Constants.
Printed on: 10/19/00
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