AnalogX CAN bus API

Overview

The CAN bus API provides the configuration and control interface for AnalogX

CAN base ID

CAN base ID is 0xE4600 (935424)

Adjusting Base ID

The base address is determined by the state of the ADR1 and ADR2 jumpers. By default, the jumpers are closed (bridged); the jumper can be opened by cutting the trace between the pads. To re-close the jumper, add a small amount of solder to bridge the gap between the pads you want to close.

Opening the jumper ADR1 will add 256 to the base ID
Opening the jumper ADR2 will add 512 to the base ID.

The combination of jumper settings will allow up to 4 AnalogX units to coexist on the same CAN bus.

ADR2 Jumper	ADR1 Jumper	Address
Closed	Closed	0xE4600 (935424)
Closed	Open	0xE4700 (935680)
Open	Closed	0xE4800 (935936)
Open	Open	0xE4900 (936192)

CAN Baud rate

500K and 1MB rates are supported.

500K is enabled by default; cut the jumper labeled BAUD on the bottom of AnalogX to enable 1MB rate.

CAN Messages

Announcement

The announcement message is broadcast by the AnalogX upon power up.

Address

CAN ID: Base + 0

Offset	What	Value
0	Channel Count	Total number of channels on device
1	Reserved
2	Reserved
3	Reserved
4	Reserved
5	Major Version	Firmware Major Version Number
6	Minor Version	Firmware Minor Version Number
7	Patch Version	Firmware Patch version number

Configuration Group 1

Configures options for AnalogX.

Send this message to AnalogX to configure runtime settings.

Note: Settings are volatile and are not persisted across power cycles.

Address

CAN ID: Base + 3

Offset	What	Value
0	Sample Rate	Rate to report sensor values ( 1 - 255Hz). Default sample rate is 50Hz.
1	Reserved
2	Reserved
3	Reserved
4	Reserved
5	Reserved
6	Reserved
7	Reserved

Statistics

Broadcast by AnalogX every 1 second.

Address

CAN ID: Base + 2

Offset	What	Value
0	Current Sample Rate	1 - 255Hz
1	Reserved
2	Reserved
3	Reserved
4	Reserved
5	Major Version	Firmware Major Version Number
6	Minor Version	Firmware Minor Version Number
7	Patch Version	Firmware Patch version number

Sample Broadcast

Sample Broadcast for Analog inputs. The samples are broadcast based on the configured sample rate (default is 50Hz)

Scaling and Data format

Scaling: 0-5000mV
Data format: Little Endian

Address

CAN ID: Base + 20

Offset	What	Value
0	Channel 1, low byte
1	Channel 1, high byte
2	Channel 2, low byte
3	Channel 2, high byte
4	Channel 3, low byte
5	Channel 3, high byte
6	Channel 4, low byte
7	Channel 4, high byte