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CAN interface communications
C-Series Product Manual
115
RTR, IDE, r0
The RTR, IDE, and r0 bits are not used in the TriContinent CAN imple-
mentation and should always be set to 0.
Data length code (DLC)
This is the length of the data block in the message. Data blocks can be
from zero to eight bytes in length.
CAN data block
The data block contains the information to be transmitted (pump com-
mands), up to eight bytes. For command strings that are more than
eight bytes in length, multi-frame messages are used. This permits long
program strings to be sent, just as when other communications inter-
faces are used.
Pump commands are sent in ASCII just as in RS-232 or RS-485.
CAN frame bits (3), and frame types
The frame type (specified by the three bits in the Frame portion of the
MID) allows a device to know what type of command is coming in and
CAN arbitration field
CAN control field
CAN
data
block
MID
RTR
IDE
r0
Data
Length
(DLC)
Direction
Group
Device
Frame
X
010
XXXX
XXX
0
0
0
XXXX
0-8
bytes
CAN arbitration field
CAN control field
CAN
data
block
MID
RTR
IDE
r0
Data
Length
(DLC)
Direction
Group
Device
Frame
X
010
XXXX
XXX
0
0
0
XXXX
0-8
bytes
CAN arbitration field
CAN control field
CAN
data
block
MID
RTR
IDE
r0
Data
Length
(DLC)
Direction
Group
Device
Frame
X
010
XXXX
XXX
0
0
0
XXXX
0-8
bytes
CAN arbitration field
CAN control field
CAN
data
block
MID
RTR
IDE
r0
Data
Length
(DLC)
Direction
Group
Device
Frame
X
010
XXXX
XXX
0
0
0
XXXX
0-8
bytes
Summary of Contents for C24000
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