Manual R600V.DAE0 (EN)
R600V.DAE0_manual_1.5 (EN).docm
Page 19 of 29
Default address:
0x80
3.2.3
Address resolution sequence
After reset, the device performs the following start-up sequence:
1. After in
itialization, send “request for address claimed” message (PGN 0xEE00)
a. At initialization, clear the address sort table
b. Send a request for address claimed. This causes other devices on the bus
to claim their addresses
2. Wait 1250 ms. During this time, incoming address claims are evaluated and mark
addresses claimed by devices with higher priority ISO names (NAME) than our own
as “claimed” in the address sort table.
3. Send
“address claimed” message
a. Claim the own address, which is derived from the sort table. Address =
First free address in the sort table which is equal or higher than the pre-
ferred address (0x80) (1)
4. Wait 250 ms and handle address collisions.
When, during this time, another device with higher priority claims our last claimed
address, we will mark it as “claimed” and claim the next free address in the table
(1)
5. Start transmitting the cyclic ground & canopy message.
The CAN SAE J1939 standard generally defines the address claim procedure. Each device
on the bus can request an new address claiming from a single device or all nodes. The re-
questing device has to send a request (PGN 0xEA00) with the desired destination address
DA (address of node, global address 0xFF) the data of the message must include the PGN
0xEE00.
Tab 8
Address management messages
Message
PGN
PF
PS
SA
Length
DATA
Request for address claimed
0xEA00
234
DA
SA (2)
3 bytes
PGN 0xEE00
Address claimed
0xEE00
238
255
SA
8 bytes
NAME
Cannot claim source address
0xEE00
238
255
254
8 bytes
NAME
Commanded address
0xFED8
254
216
SA
9 bytes (3)
NAME, new SA
(1) This means that, provided no new sensors are mounted, each sensor will end up with the
same device address each time. However, if a new sensor is added to the system, ad-
dresses might shift up or down according to the new sort order, which is always from lowest
to highest serial number.
(2) In case no address has been claimed, yet the address may be set to 254
(3) longer than 8 bytes; transport protocol used instead
