Page 6 ams Datasheet
Document Feedback [v1-00] 2015-Apr-01
HLS-440P − Electrical Inter face
CAN Bus Interface
This section describes the CAN bus interface that is available in
some variants of HLS-440P.
Physical Interface
The physical interface is two-wire balanced. It is a high speed
CAN interface (ISO 11898-2) with bus bit rate at 500 kbit/s.
Type A: 120 Ohm CAN bus termination
Type B: no termination
CAN Matrix HLS-440P
HLS-440P will send the first CAN message 0.1 s after start-up.
The repetition rate of the CAN message is 100ms ±2ms. The first
H
2
concentration will be delivered after 5 s. The CAN messages
prior to that will have the "Not_ready" bit set, indicating that
the concentration value of the message is not valid.
I n c as e of a wa r m r es t ar t ( < 5s ) er ro r ca te go r y 1 w il l be s et fo r 1 0 s.
The Msg Counter increments with each CAN message.
Each CAN message is sent twice. The first time it is sent with ID
1592 (0x0638) for type A and 1600 (0x0640) for type B. The
second time it is sent with ID 1595 (0x063B) for type A and ID
1603 (0x0643) for type B. The second time all bytes excluding
byte 7 are inverted. Byte 7 has the fix value 170 (hex AA) in the
second message.
