ZLG CANHub-AF2S2 Operational manual

Product User Manual
CANHub-AF2S2
Optical CAN Hub
UM01010101 V1.02 Date: 2019/03/15
©2021 Guangzhou ZLG Electronics Technology Co.,Ltd.
Category
Contents
Keywords
CANHub-AF2S2, Optical CAN Conversion, Hub
Description
The CANHub-AF2S2 intelligent CAN hub has two optical
fiber interfaces and two electrically isolated CAN bus
twisted pair interfaces. This realizes data
reception/storage/forwarding between four independent
CAN networks of different rates, filters unnecessary CAN
messages, reduces the load of the subnet, CAN network
topology, extends the network communication distance,
and increases the number of nodes and other functions

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Optical CAN Hub User Manual
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Revision History
Version
Date
Description
V1.00
December 18, 2014
Created
V1.01
March 10, 2015
Added a dimension drawing.
V1.02
March 15, 2019.
Updated the document header and footer and "Sales and
Service Network" content, and added the "Disclaimer" content

CANHub-AF2S2
Optical CAN Hub User Manual
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Contents
1. Functions .....................................................................................................1
1.1 Product Overview ..............................................................................................1
1.2 Parameters........................................................................................................2
1.3 Typical Applications...........................................................................................2
2. Hardware .....................................................................................................3
2.1 ProductAppearance..........................................................................................3
2.2 Components and Functions ..............................................................................3
3. Device Installation........................................................................................5
3.1 Installation..........................................................................................................5
3.1.1 Precautions.................................................................................................5
3.1.2 Appearance and Dimensions.....................................................................5
3.2 Wiring.................................................................................................................6
3.2.1 Power cable connection.............................................................................6
3.2.2 Connecting to the PC from RS-232 ...........................................................7
3.2.3 Connecting the Network.............................................................................8
3.2.4 LED Indicators..........................................................................................11
4. Function Configuration...............................................................................12
4.1 Software Startup Interface...............................................................................12
4.2 Basic Information.............................................................................................14
4.3 Baud Rate........................................................................................................16
4.4 Routing ............................................................................................................19
4.5 Filtering............................................................................................................20
4.6 Status...............................................................................................................21
5. Inspection and Maintenance......................................................................24
6. Disclaimer..................................................................................................27

CANHub-AF2S2
Optical CAN Hub User Manual
©2021 Guangzhou ZLG Electronics Technology Co.,Ltd.
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1. Functions
1.1 Product Overview
The CAN transmission medium can be twisted pair, optical fiber and coaxial cable. At
present, the CAN bus distributed system of twisted pair has been widely used, such as
automobile, elevator control, power system control. Various technologies have matured.
Compared with twisted pair and coaxial cable, the low transmission loss of optical fiber
greatly increases the transmission distance. In addition, the optical cable also has the
characteristics of not radiating energy, non-conducting, and non-inductive.Moreover, there
is no influence of crosstalk and mutual interference of optical signals in the optical cable, it
has excellent anti-EMI and EMC characteristics, and there is no safety problem caused by
inductive coupling in the cable.
The CANHub-AF2S2 realizes the transparent connection of multiple CANs, and
realizes multi-point connection of complex structures at the bus level; CANHub-AF2S2
enables the backbone network to have no branch length restrictions, and any two nodes in
the network can reach the protocol distance. The device has four communication ports.
Both twisted pair ports have independent CAN transceivers, which can double the number
of nodes. Therefore, this provides a free wiring method, and eliminates the drive limit of
the maximum number of nodes of the CAN transceiver on the system bus. The two optical
fiber ports enable CANHub-AF2S2 to be used in high-interference field environments,
especially in high-voltage applications, power applications and other environments. Each
port also provides an indicator for detecting bus activity and bus failure, which helps
observe the working status of the CAN bus network.
The CANHub-AF2S2 can be used in CAN networks with baud rates up to 1 Mbps. All
channels can work at different baud rates. CANHub-AF2S2 complies with CAN
specification 2.0A (11-bit CAN identifier) and 2.0B (29-bit CAN identifier). Transparent,
protocol-independent CAN message transmission is supported, making it suitable for a
variety of application scenarios.
After the CANHub-AF2S2 is connected to four CAN networks, if the user enables the
adaptive bus baud rate function, the two twisted pair channels in the device can detect the
bus baud rate of the CAN network (limited to nine standard CAN baud rates defined by
CiA: 1Mbps, 800Kbps, 500Kbps, 250Kbps, 125Kbps, 100Kbps, 50Kbps, 20Kbps,
10Kbps), and then automatically set the baud rate of these two channels to suit the two
different CAN networks. Because optical fiber communication is point-to-point, there is no
concept of adaptive baud rate.
The CANHub-AF2S2 can be configured with CAN message filters to ensure that only
the required data is transmitted to other CAN networks through the repeater; at the same
time, it also has a data routing function, which can selectively forward CAN messages
received by one channel to another channel. Therefore, the device can effectively reduce
the network load. CANHub-AF2S2 can be connected to the PC through the serial port to
configure its communication parameters; provide configuration software on Windows,
which is easy to use and supports configuration to take effect immediately. Once the

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device is configured, it can be put to work without any operation.
1.2 Parameters
◆CAN interface: using OPEN interface (CANH, CANL);
◆The CAN channel adopts electromagnetic isolation, DC/DC power isolation,
isolation voltage: 2,500 V DC;
◆CAN interface EMC level: contact discharge ±8 kV, group pulse ±2 kV;
◆The fiber type is single-mode fiber, SC interface;
◆Maximum frame flow: single channel can be as high as 6,000 frames per second
or more (1M baud rate, extended data frame);
◆Support CAN2.0A and CAN2.0B protocols, conform to ISO/DIS 11898-1/2/3
standard;
◆CAN baud rate: programmable and set arbitrarily, between 5 kbps and 1 Mbps;
◆Optical fiber baud rate: programmable and arbitrarily set, between 5 kbps and
800 kbps;
◆The CAN can be installed with a built-in 120 ohm terminal resistor, connected to
R+ and R- terminals;
◆Installation method: optional standard DIN rail installation or simple fixing method;
◆Can be used in environments with safety and explosion-proof requirements;
◆Operating voltage; 9 V to 26 V;
◆Operating temperature: -40°C to +85°C ;
◆Storage temperature: -40°C to +85°C ;
1.3 Typical Applications
●Industrial automation control system;
●Intelligent building control data and broadcasting system;
●Security product;
●Electricity, mining communications;
●Other field control and communication fields;

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2. Hardware
2.1 Product Appearance
Figure 2.1 shows the appearance of CANHub-AF2S2 device.
Figure 2.1 CANHub-AF2S2 optical CAN hub
2.2 Components and Functions
Figure 2.2 and Table 2.1 show CANHub-AF2S2 components.
Figure 2.2 CANHub-AF2S2 components

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Table 2. 1 Functions of CANHub-AF2S2 components
Label
Name
Description
A
CAN bus twisted pair port
Corresponding port: CAN2
B
CAN bus fiber optic port
Corresponding port: Fiber2
C
CAN bus fiber optic port
Corresponding port: Fiber1
D
CAN bus twisted pair port
Corresponding port: CAN1
E
Bus active indicator (Action,
green)
Corresponding to four ports (from left to right in
Figure 2.2):
CAN2, Fiber2 , Fiber1 , CAN1
F
Bus error indicator (Fault, red)
Corresponding to four ports (from left to right in
Figure 2.2):
CAN2, Fiber2 , Fiber1 , CAN1
G
System running indicator (SYS,
green)
Indicates that the system is operating properly.
It flashes once every 2 seconds
H
Power indicator (PWR, red)
System power-on indication
I
RS232 communication port
Configure CANHub-AF2S2 through this port
J
DC JACK jack
Power Interface
K
AWG 14-22 pluggable terminal
blocks
Power Interface
L
Fixed flanks
Fixed CANHub-AF2S2

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3. Device Installation
This chapter describes how to install a CANHub-AF2S2 device, including device
installation and system wiring. Be sure to install it by referring to the instructions. Improper
installation may cause equipment malfunction, resulting in damage to the equipment.
3.1 Installation
3.1.1 Precautions
To improve system reliability and maximize device functionality, be sure to consider
the following factors during installation and wiring. Environmental Conditions Do not
install the device in any of the following locations.
●Places where the ambient temperature is lower than -25°C or higher than +70°C;
●Places with rapid temperature changes and condensation;
●The ambient humidity is lower than 10% or higher than 90%;
●Places with corrosive or flammable gases;
●Locations with excessive dust, chloride or ironwood dust;
●Places where the device is subject to direct shock or vibration;
●Places exposed to direct sunlight;
●The device may come into contact with water, oil, and chemical agents.
Be sure to adequately enclose or protect the device in the following locations.
●Places with static electricity and noise;
●Places with strong electromagnetic fields;
●Locations where there may be radioactive leakage;
●Locations near power cables.
Installation in a Cabinet or Control Panel When the device is installed in a cabinet
or control panel, provide an appropriate suitable operating and maintenance environment.
In a closed environment, the ambient temperature must be within the range of -25°C to
+70°C. If necessary, maintain an appropriate temperature by:
●Provide enough space for air circulation;
●Do not install the device on top of equipment that generates high heat, such as
heaters, transformers or high-power resistors; If the ambient temperature
exceeds 70°C, install a cooling fan or air conditioner.
3.1.2 Appearance and Dimensions
The dimensions of CANHub -AF1 S1 are 118 mm x 72 mm x 25.9 mm, and the
housing has fixing holes. Figure 3.1 shows the device appearance.

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Figure 3. 1 CANHub-AF2S2 appearance
3.2 Wiring
3.2.1 Power cable connection
DC power supply: Provide 9-24 V DC/AC, and keep the voltage fluctuation within the
specified range;
Power supply: TheCANHub-AF2S2 has a rated power of 5 W. But when the current is
connected, the inrush current will reach about 5 times this current;
Terminals: CANHub-AF2S2 has two power input terminals: two Pin AWG 14-22
plug-in terminals and DC JACK socket. The power cord can be connected to either
terminal, but not both power terminals at the same time. AWG 14-22 plug-in terminals are
M3.5 terminal screws. Use crimp terminals for wiring, or connect bare stranded wires
directly to the terminals, and use a screwdriver to tighten the screws of the terminal block.
If the power is fully connected, the "PWR" indicator will remain red. Figure 3.2 shows the
wiring.

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Figure 3.2 CANHub-AF2S2 power interface
3.2.2 Connecting to the PC from RS-232
The CANHub-AF2S2 is configured via the RS-232 interface. Figure 3.3 and Table 3.1
show the pins for the RS-232 interface on this device.
Figure 3.3 RS-232 interface of CANHub-AF2S2
Table 3.1 Description of the RS-232 interface pins of CANHub-AF2S2
Pin
Signal
Description
1
N.C.
2
TXD
Send Data
3
RXD
Receive data
4
N.C.
5
GND
Signal ground
6
N.C.
7
N.C.
8
N.C.
9
N.C.
This port uses a DB-9 female connector. Before configuration, connect
CANHub-AF2S2 to the PC by using an RS232 extension cable (delivered with the
product). If a crossover cable is used, communication fails.

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3.2.3 Connecting the Network
CANHub-AF2S2 provides two twisted pair and two fiber CAN channels. Each channel
is peer-to-peer and can be used to connect a CAN network or a device equipped with a
CAN interface. The four channels are respectively routed by two 5-pin AWG 14-22 plug-in
terminals and two optical fiber interfaces, as shown in Figure 3.4
Figure 3.4 CANHub-AF2S2 communication interface
1. Two twisted pair interfaces
Table 3.2 shows the pin definitions of the terminals of the two twisted pair interfaces.
Table 3.2 Pin definition of two twisted pair terminals
Pin
Port
Name
Function
1
CAN1
CAN_L
CAN_L signal cable
2
Rext
Built-in terminating resistor short-circuit terminal
3
FG
Shielded wire ground (cannot be connected)
4
Rext
Built-in terminating resistor short-circuit terminal
5
CAN_H
CAN_H signal cable
1
CAN2
CAN_L
CAN_L signal cable
2
Rext
Built-in terminating resistor short-circuit terminal
3
FG
Shielded wire ground (cannot be connected)
4
Rext
Built-in terminating resistor short-circuit terminal
5
CAN_H
CAN_H signal cable
When the CANHub-AF2S2 device is connected to the CAN network through the
twisted pair interface, CAN_L is connected to CAN_L, and CAN_H is connected to
CAN_H. According to the ISO 11898 specification, to reduce the signal reflection on the
CAN bus and enhance the communication reliability, the two endpoints of the bus usually
require a termination matching resistor. The termination matching resistance is
determined by the characteristic impedance of the transmission cable. For example, if the
characteristic impedance of a twisted pair is 120 ohm, both endpoints on the bus should
also be connected to 120-ohm termination resistors. CANHub-AF2S2 has a built-in
terminating resistor. When the device is connected to the CAN network through two
twisted pair interfaces, you need only to short-circuit the two Rexts of the twisted pair port
with wires to realize the access terminal resistance, as shown in Figure 3.5

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Figure 3. 5 CANHub-AF2S2 connected to CAN network through the twisted pair interface
The CANHub-AF2S2 twisted pair interface is compatible with the DeviceNet port in
physical structure, but is different in electrical structure. Do not directly insert the
communication port of the DeviceNet device into the twisted pair port of the
CANHub-AF2S2, although the device port can withstand the voltage of 36 V DC, as
shown in Figure 3.6.
Figure 3.6 CANHub-AF2S2 twisted pair interface electrical structure not compatible with DeviceNet port
2. Two fiber optic interfaces
CANHub-AF2S2's two optical fiber interface structure is very simple. Each fiber optic
interface has only two ports that provide fiber optic connections: one is the fiber optic
output port (TX), and the other is the fiber optic input port (RX). See Figure 3.7.

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Figure 3. 7 CANHub-AF2S2 optical interface
Because the optical fibers are connected point-to-point (several cables cannot be
connected together like twisted pairs), each optical fiber interface of the CANHub-AF2S2
has two connectors, TX and RX, for connecting the optical fibers. The TX of the optical
fiber interface can only be connected to the RX of another optical fiber interface through
the optical fiber. Figure 3.8 shows the connection method.
Figure 3.8 CANHub-AF2S2 optical interface connection
One CANHub-AF2S2 can be connected to another CANHub-AF2S2 or other device
equipped with the optical fiber interface by using the optical fiber, but it must be ensured

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that the optical fiber interface of the device is compatible with the optical fiber interface of
CANHub-AF2S2.
3.2.4 LED Indicators
There are 10 LED indicators on the top panel of the CANHub-AF2S2. After the CAN
bus is connected, when the system has no data transmission, the network active status
indicator and the network error status Fault indicator should be off. When there is data
transfer, all the network active statusActive indicator flashes. When an error occurs on the
CAN bus, the network error status Fault indicator flashes. The following table describes
the functions.
Table 3.3 Indicator status and meaning
Indicator
Display
Meaning
PWR
Red
The power is on
Turn off
There is no power supply, or the power cable is faulty.
SYS
Green (flashing
frequency 0.5 Hz)
The system works properly
Turn off
The system is not working
Flashing quickly or
erratically
Insufficient power supply
Continued
LED
name
Display
Meaning
Active
Green
The bus of the corresponding port is active and
flashes when there is continuous data passing
through
Turn off
The bus for the corresponding port is inactive
Fault
Red (always on)
The optical fiber is not inserted, or the optical fiber
has been removed (limited to the CAN channel
corresponding to the optical fiber interface)
Red (flashing)
The bus of the corresponding port has an error
Turn off
There is no error on the bus of the corresponding
port, or the fiber has been inserted

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4. Function Configuration
This chapter describes how to access various configuration, monitoring, and
management functions of CANHub-AF2S2. Before connecting to the CAN, configure the
CANHub-AF2S2 to meet the actual application requirements. The device configuration
includes CAN baud rate, message routing, message filtering, and adaptive baud rate
timeout. Connect the CANHub-AF2S2 to a PC via an RS232 cable, and a dedicated
configuration program running on the PC completes the settings without any hardware
jumper or switch configuration. The configuration takes effect immediately after it is
complete.
Configure the device by using "CAN General Configuration Software - CANCfg" on
Windows. The software is included on the CD-ROM delivered with the product. The
configuration program can save the last successfully set parameters of the device. Before
configuring the device, connect the device to the PC by using the RS232 communication
cable delivered with the product. The following describes the main configuration
parameters in detail with reference to the configuration software.
4.1 Software Startup Interface
After running the configuration software CANCfg, the software startup interface is
shown in Figure 4.1. Click "CANHub-AF2S2". The CANHub-AF2S2 configuration interface
appears, as shown in Figure 4.2. After opening the CANHub-AF2S2 configuration
interface, you can see the five tabs: Basic Information, Baud Rate, Routing, Filtering,
Status, and Product Introduction.

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Figure 4.1 CANCfg startup interface

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Figure 4.2 Selecting CANHub-AF2S2
4.2 Basic Information
The first tab of CANHub-AF2S2 configuration is basic information, including serial
port connection and disconnection, basic information of the device, global settings of the
device, and import and export of configuration files.
1. Serial port connection
Select the port where the program communicates with CANHub-AF2S2. The
drop-down list in the combo box lists the serial communication ports available in the
system. Click the "Connect" button to open the selected serial port, as shown in Figure
4.3.

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Figure 4.3 Connecting the serial port
2. Device information
Click the "Get All" button. If all the information and settings of the device are obtained
successfully, the product information of the device will be displayed in the device
information list.
3. Get All
Read configuration from CANHub-AF2S2 (including configuration of other tabs).
4. Set All
Writes all configurations (including those of other tabs) to the CANHub-AF2S2 device.
After configuring the baud rate parameters, routing parameters, and filtering parameters
of the device, switch to the "Basic Information" page, and click the "Set All" button to
complete all the device configurations.
5. Import the configuration file
Import the configured device configuration file. See Figure 4.4.

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Figure 4.4 Importing the configuration file
6. Write the configuration file
After configuring the device, you can export all the configurations through the file by
using the "Write Configuration File" button.
4.3 Baud Rate
Figure 4.5 shows the baud rate setting interface, including the setting of the baud rate
parameters of four channels and the parameter setting of the adaptive baud rate (only
applicable to two electrically isolated twisted pair CAN channels: CAN1, CAN2).
On the basic information page, click the "Get All" button to obtain all the configuration
information of the device, including the 4-channel baud rate setting parameters and the
adaptive bus baud rate setting parameters.
After setting the baud rate parameters, write these parameters into the
CANHub-AF2S2 device. After the self-adaptive baud rate parameters are set, they will
take effect after the device is powered on again.

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Figure 4.5 Baud rate setting interface
1. Baud rate setting (four channels: CAN1, fiber 1, fiber 2, CAN2)
Select the baud rate of the corresponding channel. If you need to customize the baud
rate of a channel, click "Customize" and enter the baud rate calculated by yourself in the
edit box below.
CANCfg has preset several baud rates, some of which are compliant with CiA
recommended baud rates. But these preset baud rates do not necessarily meet the
requirements of practical applications. Therefore, the configuration software allows you to
customize the baud rate. Many elements of the baud rate can be customized. Use a 32-bit
value to describe the entire baud rate. The following figure shows its structure.
BRP Preset baud rate Range: 1 to 64
BRP = 29BRP.3+28BRP.2+27BRP.1+26BRP.0+25BRP.5+24BRP.4+
23BRP.3+22BRP.2+21BRP.1+20BRP.0+1
SAM Sampling mode Register BTR1
SAM = 0: Single sample mode
SAM = 1：Three-sampling mode
SJW Synchronize jump width Range: 1-4