xvii
IQAN-Lx addressing/terminating
6 Installation
Instruction book, IQAN- Lx
IQAN-Lx addressing/terminating
Addressing
Each Lx module will have a specific address, enabling the
master module
to
communicate with the modules through the CAN-bus. When operating, the system
distinguishes between different modules by first verifying the module type and
secondly, through the modules having unique addresses.
The maximum number of similar modules in a system is four or eight depending on the
master module, denoted in the first case as addresses 0, 1, 2, 3 respectively. In order to
assign any Lx module a unique CAN-address, an
ID-Tag
will have to be connected to
the positions ADDR-H and ADDR-L.
Connecting of Id-Tag in Lx connector.
Terminating
To eliminate interference in the communication, through the CAN-bus, the CAN-bus
must be terminated. Because the master module always is located at the beginning of
the bus, the master is provided with an internal termination.
You will only need to terminate the end of the bus.
If an IQAN-Lx is located at the end of the CAN-bus then use an ID-tag having a
combined address and terminating function. This is denoted with a "T" for terminating,
after the appropriate address such as; 0T, 1T, 2T...
Selecting appropriate Id-Tag
•
Check the address number of the module.
•
If the module is located at the end of the CAN-bus then select the appropriate
ID-
Tag
denoted with a "T".
N
OTICE
The CAN-bus must not be terminated using an external regular terminating resistor,
due to the fact that terminating is made from within the Lx module in conjunction with
the installed
ID-Tag
.
EXAMPLE
If having an IQAN-Lx module with address 0, the system will denote this
one as Lx-A0, The letter "A" refers to CAN-bus A.
0
10
11
12
1
2
3
ADDR-L, pos. 7
ID-Tag
ADDR-H, pos. 8
