TriContinent C24000, Product Manual

Page: 119 / 144

CAN interface communications
C-Series Product Manual
119
Note: Only one command of a given frame type can be in progress at any
time: e.g., after issuing a command to a pump with frame type = 1, the master
must wait for the answer with frame type = 1 before issuing the next com-
mand with frame type = 1. If a second command of the same type is sent with-
out waiting, a command overload status results. Several commands with
different frame types can be in progress at the same time (e.g., an action
command and a query command).
Example host/pump exchanges
The following are typical exchanges between the host and pump for
action commands, multi-frame commands, common commands, and
query commands.
Action command example
The host sends a [ZR] command to a pump, where the pump is set to
address 0.
1.
Host sends:
2.
Pump acknowledges:
3.
After executing the command, pump reports status:
Note: “
`
0“ decodes as first byte status = idle, followed by a null character
(hex zero).
Direction Group Device Frame
Type RTR/IDE/r0 DLC Data bytes
0 010 0000 001 000 0010 0x5A 0x52 (“ZR”)
Direction Group Device Frame
Type RTR/IDE/r0 DLC
1 010 0000 001 000 0000
Direction Group Device Frame
Type RTR/IDE/r0 DLC Data bytes
1 010 0000 001 000 0010 0x60 0x00h (“ ` 0”)