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CAN interface communications
C-Series Product Manual
117
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There is no type 5 frame.
Type 6: Report/answer commands. Frame bits = 110
This frame type is used to get information back from the pump. It is sim-
ilar in operation to the query commands (e.g. [?]) used in the OEM and
DT protocols. The report command is one or two bytes long since the
command is sent as ASCII characters in the data block.
When the pump responds to a query, the first byte of the data block is
the status byte. It is defined like the status byte in the RS485 and RS485
protocols. The next byte is a null character. The remaining six bytes are
for the response in ASCII. If the pump is only reporting current status,
the message is only two bytes long. If the reply consists of more than six
bytes, multi-frame messages are used.
Handling of pump boot requests
When the pump is first powered up or receives a system reset command
(frame type 2, command 0), the pump notifies the host of this condition
by sending a boot request message at intervals of 10-12 seconds until it
receives a boot request response. The group number is 1 for the boot
request message. The frame type is 2 when the pump sends messages
to the host, and the frame type must be 0 when the host replies to the
boot request.
Example 1. The pump is set to address 0.
1.
Pump sends boot request (Group=1, Frame=2):
2.
Host acknowledges:
Acknowledgment details:
Direction
Group
Device
Frame
RTR/IDE/r0
Length
1
001
0000
010
000
0000
Direction
Group Device
Frame
RTR/IDE/r0
Length Data bytes
1
1.
Node ID = Group ID (2) high nibble, + pump address (0) low nibble = 0010 0000
Slave ID = Same as Node ID
Node ID
2
2.
The pump will save the Node ID to use for message filter Group ID.
Slave ID
0
001
0000
000
000
0010
0010 0000
0010 0000
Direction = 0
Host to slave
Group = 1
Boot request response group
Device = 0
Always 0 in boot response
Frame = 0
Boot request response frame
RTR/IDE/r0 = 0
All three always 0
Length = 2
Two data bytes in return message
Note:
Boot MID is the same for all nodes.
Summary of Contents for C24000
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