Novus USB-i485 User manual

NOVUS AUTOMATION 1/13
USB-i485 Converter
RS485/RS422
INSTRUCTION MANUAL V1.0x G
CE Mark
This is a Class A product. In a domestic environment, this product may cause radio interference in which case the user may be required to take
adequate measures.
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1 SAFETY ALERTS...............................................................................................................................................................................................3
2 PRESENTATION................................................................................................................................................................................................4
3 DIMENSION .......................................................................................................................................................................................................5
4 USB DRIVER INSTALLATION...........................................................................................................................................................................6
4.1 WINDOWS..........................................................................................................................................................................................................6
4.2 LINUX .................................................................................................................................................................................................................6
4.3 MAC....................................................................................................................................................................................................................6
5 SERIAL PORT (COM PORT) ASSIGNMENT - WINDOWS...............................................................................................................................7
5.1 DETERMINATION..............................................................................................................................................................................................7
5.2 SELECTION .......................................................................................................................................................................................................7
5.3 IMPORTANT RECOMMENDATION ..................................................................................................................................................................8
6 CONNECTIONS.................................................................................................................................................................................................9
6.1 HALF-DUPLEX RS485 HALF-DUPLEX (2 WIRES)...........................................................................................................................................9
6.2 FULL-DUPLEX RS485 FULL-DUPLEX (4 WIRES) .........................................................................................................................................10
6.3 RS422...............................................................................................................................................................................................................10
7 CONFLICTS WITH OTHER USB DEVICES UNDER WINDOWS...................................................................................................................11
8 TECHNICAL SPECIFICATIONS ......................................................................................................................................................................12
9 WARRANTY .....................................................................................................................................................................................................13
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NOVUS AUTOMATION 3/13
1 SAFETY ALERTS
The symbols below are used in the device and throughout this manual to draw the user’s attention to important information related to device safety
and use.
CAUTION
Read the manual fully before installing and
operating the device.
CAUTION OR HAZARD
Risk of electric shock.
ATTENTION
Material sensitive to static charge. Check
precautions before handling.
All safety recommendations appearing in this manual must be followed to ensure personal safety and prevent damage to the instrument or system.
If the instrument is used in a manner other than that specified in this manual, the device’s safety protections may not be effective.
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NOVUS AUTOMATION 4/13
2 PRESENTATION
The USB-i485 Converter is a cost-effective way to convert RS485 or RS422 industrial buses to a USB interface. When connected to a PC USB
port the USB-i485 Converter is automatically detected and is installed as a native COM port, which is compatible with any existing serial
communication application.
Multiple modules can be installed when using USB hubs thus allowing a hassle-free configuration of a multi serial system without any IRQ or DMA
configuration.
1500 Vdc galvanic isolation between the USB port and RS485/RS422 protects the PC from spikes or possible misconnections in the
communication bus.
The USB-i485 Converter can be configured for four-wire (Full Duplex) RS422 and RS485 or two-wire (Half Duplex) networks. When operating in
two-wire RS485 the data transfer control is automatically done by the converter. Two independent and isolated RS485 networks can be supported
by one USB-i485 Converter thus duplicating the possible number of remote devices.
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NOVUS AUTOMATION 5/13
3 DIMENSION
The USB-i485 Converter has the following dimensions:
Fig. 01 – USB-i485 Converter
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NOVUS AUTOMATION 6/13
4 USB DRIVER INSTALLATION
The following installation steps may be slightly different depending on your PC configuration and Windows version. Follow the Wizard instructions
and use the following steps and figures to select the correct installation options.
4.1 WINDOWS
a) Run the driver file available on our website.
b) Connect the module to a PC USB port. Windows® will detect the new hardware and will try to install it automatically.
c) After a few seconds, an installation error message will be displayed on the bottom right corner of the screen. This error has to do with the fact
that Windows cannot recognize any device that has not been previously subscribed by Microsoft.
d) Open the Device Manager screen and search for the “F232R USB UART” device in the “Other Devices” category. Double-click it and click on
the “Update Driver...” button.
e) Choose the “Browse my computer for driver software” option.
f) Select the “Drivers\Windows”. Let the “Include subfolders” selected.
g) If a window asking whether you want to install this driver pops up, choose to install.
h) Wait a few more seconds. A window displaying the installation success will be shown.
4.2 LINUX
Since version 2.4.20, the necessary driver for the converter to work properly is already included in kernel.
Once you connect the converter to a PC USB port, the following modules should be loaded (they must be in the kernel list of modules):
ftdi_sio (specific driver of the converter);
usbserial (generic driver for USB-Serial conversion);
usbcore (basic driver for USB devices).
4.3 MAC
See the documentation on the device page on our website. The Virtual Driver COM file provides information about how to perform the installation.
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NOVUS AUTOMATION 9/13
6 CONNECTIONS
The appropriate connection to the USB-i485 Converter depends on the type of serial network: RS422, 2-wire RS485 or 4-wire RS485. The
following figure shows a description of all USB-i485 Converter connection terminals.
Fig. 05 – Device Connections
A shielded twisted-pairs cable is recommended for wiring the communication bus from the converter to all network devices. The shield should be
grounded and/or connected to the common terminals of all devices. The minimum recommended wire gauge is 24 AWG (0,2 mm2).
Use of a wire connecting all devices common terminals is highly recommended. Damage of the networked devices may
result if this recommendation is not followed.
RS485 or RS422 devices from different vendors or of different models may identify the communication terminals using distinct notation. The
following table shows some of this notations and its equivalence to the USB-i485 Converter.
USB-i485 CONNECTION IDENTIFICATION Rx+ ou Tx+ Rx- ou Tx-
POPULAR RS485 AND RS422 CONNECTION IDENTIFICATION
D
D
D1 D0
B A
D+ D-
Table 01 – Identification
6.1 HALF-DUPLEX RS485 HALF-DUPLEX (2 WIRES)
To set this mode of operation, the MOD terminal (pin 4) must be left unconnected.
This is the usual RS485 connection. A single twisted pair is used for data transmission and reception. Multiple RS485 devices are connected in a
single bus, as shown in the next figure. Devices from different vendors may use different names for the data signal terminals.
In the following figure, different identification schemes are presented for each device, with the proper connection to the USB-i485 Converter.
RS485 devices can be connected to either bus 1 or 2.
Fig. 06 – Half-Duplex RS485 (2 wires)
The common terminal (GND – pin 5) must be connected to the corresponding terminals of all network devices, to ensure the same potential in all
devices. If a common wire is not connected to all devices, all must be properly grounded according to the manufacturer recommendation. For the
USB-i485 Convert, the proper grounding terminal is pin 5 (GND).
The need to install termination resistors depends on the total length of the communication bus and the communication speed (Baud Rate). The
USB-i485 Convert has built-in termination resistors, which can be installed by wiring terminals RT1 (8) or RT2 (3) as shown in dashed lines in the
last figure.
For additional information in grounding, common wire and termination resistors, read the document RS485 & RS422 Basic, available on our
website www.novusautomation.com for download.
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NOVUS AUTOMATION 10/13
6.2 FULL-DUPLEX RS485 FULL-DUPLEX (4 WIRES)
To set this mode of operation, the MOD terminal (pin 4) must be connected to terminal GND (pin 5).
In this mode two pairs of wires are used. Data from the USB-i485 Convert to the networked devices are transmitted through one pair, and the other
pair carries data from the devices to the USB-i485 Convert. Multiple devices are connected as shown in the next figure.
Fig. 07 – Full-Duplex RS485 (4 wires)
The common terminal (GND – pin 4) must be connected to the corresponding terminals of all network devices, to ensure the same potential in all
devices. If a common wire is not connected to all devices, all must be properly grounded according to the manufacturer recommendation. For the
USB-i485 Converter, the proper grounding terminal is pin 5 (GND).
The need to install termination resistors depends on the total length of the communication bus and the communication speed (baud rate). The
USB-i485 Converter has a built-in termination resistor, which can be installed by wiring terminal RT2 (3) as shown in dashed lines in the last
figure.
For additional information in grounding, common wire and termination resistors, read the document RS485 & RS422 Basic, available on our
6.3 RS422
Full-Duplex RS485 specification supersedes RS422. The same connection instructions shown for Full-Duplex RS485 apply for RS422 connection.
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NOVUS AUTOMATION 11/13
7 CONFLICTS WITH OTHER USB DEVICES UNDER WINDOWS
Installation of the USB driver for the USB-i485 converter may result in conflicts with existing USB devices in the computer (mouse or other
Serial/USB devices, for example). In this case, follow the procedure below to restore functionality of the affected device:
o to the Windows Control Panel and open the USB-i485 Converter properties in:
Control Panel / System / Hardware / Device Manager / Ports (COM & LPT)
Select the desired “USB Serial Port” device, click with the right mouse button and select “Properties”. Select “Port Settings” and click on the
“Advanced...” button. Uncheck the “Serial Enumerator” option:
Fig. 08 – Serial Enumerator
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NOVUS AUTOMATION 12/13
8 TECHNICAL SPECIFICATIONS
Computer Interface USB V1.1 Plug and Play
Operational system
virtual serial port driver
Windows: Windows 10, 8, 7, Vista, XP, Server 2008, Server 2003, 98, ME, 2000, CE;
MAC;
Linux 2.4.20 or above.
Field Interfaces
RS485 Half Duplex (dual buses);
RS485 Full Duplex;
RS422.
Data Rate From 300 bps to 250 kbps.
Maximum RS485/RS422
cable length 1200 m
Maximum number of
devices in the RS485
network
Maximum number of devices in the RS485 network (unit load devices – 12 k ):
Half Duplex: 2 x 32 devices;
Full Duplex: 32 devices.
Power From the USB post. Consumption: <100 mA.
Isolation 1500 Vcc (1 minute) from USB interface and the RS485/RS422 interface.
RS485/RS422 bus
protection ±60 Vcc, 15 kV ESD
USB Connection Mini-B connector.
A 1.5 m cable with plugs mini-B and A is provided with the device.
RS485/422 Connector Screw terminal type accepting 1.5 mm² (16 AWG) wires.
Operating Environment 0 to 50 °C, 10 to 90 % relative humidity, non-condensing.
Communication protocol Jumper selected RS485 / RS422.
Flow Control Automatic flow control for RS485 Half Duplex.
Internal Terminating
Resistors 120 Ohms internal resistors termination enabled by jumpers.
LEDs Transmission and reception of data.
ABS Housing 70 x 60 x 18 mm.
Certifications CE
Table 02 – Technical Specifications
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NOVUS AUTOMATION 13/13
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