QDC10 - Multiplex Data on Battery Power Lines
2.2.4
Power Management
A Sleep mode, controlled by the Host, saves power by disabling most of the circuits. The device enters
into Sleep mode by a Host Sleep command. While in Sleep mode the device is periodically switched to
receive mode to sense for activity on the bus. If an activity is detected the device and its Host wake up.
Else, If an activity is not detected, the device returns to the Sleep mode. A transition on the serial DataIn
pin caused by the Host wakes the device as well.
Transmit
Run
Receive
Run
Sleep
I
t
Figure 2.2 - Operation modes
3 OPERATION
The QDC10 implements the physical layer and the MAC layer of the OSI data communication model.
The Host is responsible for the implementation of the link and application layers. The following
paragraph describes the operation of the QDC10 device.
Byte0 Byte1 Byte2
Byte16
Message starts with a
command byte
Up to 16 Data bytes
Figure 3.1 - Message construction
3.1 Message Construction
The Host constructs a message with a header byte that describes the message content (Command or
Data), followed by 2 to 16 data bytes of data (when applicable).
C
Data to
Device
Signal on DC Line
Header
1
16
Carrier detect and resolve
Figure 3.2 - Message delay
© 2002-2010 YAMAR Electronics Ltd.
3
DS-QDC10 R1.5
www.yamar.com
Shimon Hatarsi Tel Aviv, Israel. Tel (972) 3 5445294 Fax (972) 3 5445279
YAMAR [ YAMAR ELECTRONICS LTD. ]
