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Chapter 3 Explanation of Category Items
Instrument Explorer shows the categories to which parameters and generated variables belong. This provides a
convenient method for describing the functionality and purpose of each. The categories can be seen from
Instrument Explorers Parameter List pane and are as follows.
Communications
This category deals with the setting of the CAN ID, the bit rate and the ID size. Care must be taken when changing
any of these parameters otherwise communications can be lost.
Defaults are:
ID = 1
Identifier length = 11Bits (standard)
Bit Rate = 500Kbps
ID, NODEIDL, NODEIDH
Each device has a singe base ID to enable configuration and is factory set to 1, this base ID can be changed. All data
sent to the device will be sent to this ID. All data returned from the device will be on the base ID + 1.
Because the device ID is set via CAN, the device should be the only device connected to the CAN bus while
configuring from factory settings.
Where the DSC parameters are used to define CAN identifiers the following format is used. The packet identifier is
set using a HI and LO parameter. Each of these parameters represents 2 bytes (1 X 16 bit word) that are used to
create the identifier.
MSByte
Byte
HI
Although 16 bits are available to be set using these two parameters the value entered will depend on whether the
DSC is set for 11 bit or 29 bit identifiers.
11 bit allows a range of 0 to 3FF
HI is never used on 11 bit so LO would be set to a value from 0 to 3FF
29 bit allows a range of 0 to 1FFFFFFF
HI can range from 0 to 1FFF and LO can range from 0 to FFFF
Example
If the identifier 1ABCDEFF is to be specified:
MSByte
1A
Hexadecimal
value
Decimal value
The above values are sent in the floating point IEEE standard
Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual
Byte
LSByte
LO
Byte
BC
NODEIDH = 0x1ABC
NODEIDH = 6844
Byte
LSByte
DE
FF
NODEIDL = 0xDEFF
NODEIDL = 57087
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