The i-7531 CAN Repeater
Quick Start User Guide
1. Introduction
This user guide describes how to implement the i-7531 module into
users’ applications in a quick and easy way. Therefore, it only provides the
basic concepts. If users want to know more detail information about the i-
7531, please refer to the user manual of i-7531 in the product CD or visit
our website as follow:
The purpose of this document is focused on helping users to quickly
familiarize themselves with the i-7531 module. For example, users can
apply the i-7531 module as follow figure:
Backbone use
Backbone of CAN bus
i-7531
i-7531
i-7531
CAN branch CAN branch
CAN branch
Electronic isolation
Extended use
i-7531
i-7531
Original
CAN bus
Extended
CAN bus
Extended
CAN bus
Electronic isolation
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3. Terminator Resistor Setting
According to the ISO 11898 specifications, the CAN bus network must
be terminated by one terminal resistor on each end of CAN bus for proper
operation.
The JP2 of i-7531 is used for adjusting terminal resistor (120Ω) on
CAN Port 1, and the JP3 of i-7531 is used for adjusting terminal resistor
on CAN Port 2.
Before setting terminal resistor (120Ω) of i-7531, user needs to open
the cover of i-7531 first. Those locations of JP2 and JP3 are shown as
following figure:
The following connection statuses present the condition if the terminal
resistor is enabled (default) or disabled.
Disable
Enable
(Deactivate)
(Activate)
4. Configuration Installation
Step1: Modify JP2 and JP3 of i-7531 according to user’s application.
Step2: Connect two different CAN buses using i-7531 as follow figure:
i-7531 CAN Repeater Quick Start User Guide (ver. 1.3, 2008/03/25) -----3
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CAN Port 2
CAN_GND
CAN_H
Earth Ground
CAN DEVICE
CAN_L
5
1
9
6
3
Power
Power GND
CAN Port 1
CAN_L
CAN_H
+10VDC ~ +30VDC
CAN_GND
Earth Ground
Note2: Roughly speaking, wiring of CAN_GND and FG can improve the
capability of anti-interference of CAN bus system in harsh
environment, but this is not necessary.
Note3: When users want to calculate the total bus line length, i-7531
need also be considered.
According recommended specific line delay 5ns/m, one i-7531
(~200ns delay) should be considered as one 40m bus line.
For more information, please refer to the user manual of i-7531.
i-7531 CAN Repeater Quick Start User Guide (ver. 1.3, 2008/03/25) -----4
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