Converter RS-485 / USB
OPERATING MANUAL
Rev: 2018-01-03
CONV485USB / CONV485USB-I
2
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Table of contents
1. General information ................................................................................................ 3
2. Information LEDs .................................................................................................... 3
3. Wiring installation to PC ......................................................................................... 3
4. Wiring to RS-485 transmission line ....................................................................... 4
5. Drivers installation via Internet (First start.) ......................................................... 5
6. Manual driver installation ....................................................................................... 5
7. Checking the installed drivers ............................................................................... 5
8. Driver unistallation .................................................................................................. 5
9. Technical specification ........................................................................................... 6
10. Delivery contents ................................................................................................ 7
11. Entity launching the product on the EU market ............................................... 7
Safety Information
To ensure the device is installed and used safely, follow all instructions stated in this
Manual.
Incorrect installation of the device may cause serious health hazard and can be life
threatening.
The device has been manufactured according to the requirements of relevant EU directives.
The device must not be installed in explosive environments.
Information from the Manufacturer
All functions of the device are subject to modifications for the benefit of technical progress.
CONV485USB / CONV485USB-I
3
1. General information
The CONV485USB and CONV485USB-I converters enable connection of devices
equipped with an RS-485 transmission port to a PC equipped with a USB universal serial
bus.
The CONV485USB is intended for laboratory use and allows transmission with a rate of
up to 230.4kbps. The converter is supplied from the PC's USB port.
The CONV485USB-I is intended for industrial and laboratory use and allows signal
transmission at a range of up to 1,200m and a maximum rate of 115.2.4kbps. The device
has galvanic separation between the USB side and the RS-485 port, and is supplied entirely
from the PC's USB port. The converter can also be mounted on the 35 mm DIN rail.
The drivers supplied with the converter allow the converter to be installed as a serial
COM port.
2. Information LEDs
CONV485USB has three LEDs inside the case:
green – indicates presence of supply voltage; stays on when device is connected to PC,
yellow (RxD) and blue (TxD) – during data transmission, these LEDs should blink.
CONV485USB-I has 4 LEDs:
PWR1 (green) – indicates presence of supply voltage from USB port side,
PWR2 (green) – indicates presence of supply voltage from RS-485 port side. Since the
supply voltage is activated by the PC's software, the LED may come on with some delay.
RxD (yellow) – indicates data transmission between devices and PC (RS-485 → USB),
TxD (blue) – indicates data transmission between PC and devices (USB → RS-485),
3. Wiring installation to PC
The converter should be connected to PCs via a USB A/B cable. The standard 1.8m
USB cable is included. The USB standard allows for a 5m cable. After connecting the
converter to a computer, the green indication LED should come on (PWR1 LED in
CONV485USB-I).
.
CONV485USB / CONV485USB-I
4
No.
Symbol
Specification
1
A(+)
Data input/output signal line
2
B(-)
Data input/output signal line
No.
Symbol
Specification
1
+5V DC OUT
Supply voltage output terminal
2
A(+)
Data input/output signal line
3
A(+)
Data input/output signal line
4
B(-)
Data input/output signal line
5
B(-)
Data input/output signal line
6
GND
Ground terminal for +5V power supply
and A(+) and B(-) signal lines
4. Wiring to RS-485 transmission line
The bus-bar cables should be connected to A(+) and B(-) terminals. In an industrial
environment the shielded cable is strongly recommended. The shield should be grounded
and connected to a reference potential. We recommend the use of digital data transmission
cables, especially in the case of larger distances and higher transmission rates. For
CONV485USB-I it is also recommended to use third wire GND connected between devices.
The RS-485 standard allows connection to a total of 32 devices. The bus-bar may not be
arranged into a star connection.
Terminal block in CONV485USB:
Terminal block in CONV485USB-I:
The CONV485USB-I converter has DIP-switches for connection of terminating resistors.
Termination should be connected only if the converter is installed on one end of the
transmission line.
CONV485USB / CONV485USB-I
5
5. Drivers’ installation via Internet (First start.)
Connect the converter to the PC computer with the USB A / B cable. The green LED
should light on (in CONV485USB-I PWR1 diode). Drivers are installed automatically.
6. Manual driver installation
Connect the converter to the computer with the USB A / B cable. The green LED
should light (in CONV485USB-I PWR1 diode).
The system will automatically detect a new device and open the installation wizard
window. The CDM (Combined Driver Model) drivers downloaded from the www.metronic.pl
website or the CD attached. NOTE: The drivers are compressed into a ZIP file. Before
installation, unpack them.
7. Checking the installed drivers
In Device Manager menu, expand the Universal Serial Bus Controllers list - the USB
Serial Converter should appear. To determine the COM port number under which the
converter is "seen", expand the list of Ports (COM and LPT) in the Device Manager, where
the USB Serial Port (COMx) will be visible, where x is the COM port number (e.g. COM3).
8. Driver uninstallation
To uninstall the CDM driver, click the right mouse button on USB Serial Port (COMx) and
USB Serial Converter in Device manager and choose Uninstall.
6
USB:
Standard:
In compliance with USB 1.1 and USB 2.0
RS-485:
Baud rate:
300 bps .. 230.4 kbps
Maximal number of transmitters / receivers:
32 (limited line length and without
terminating resistors)
Different output voltage (TxD):
Nominal: 3.3 V for RL=∞
Min.: 1.5 V for RL=54 Ω
Receiver input resistance (RxD):
12 k
Minimal input voltage (RxD):
0.2 V
Acceptable voltage on A,B terminals:
+/-12 V (max)
Short-circuit protection:
Yes
Others:
Power supply:
From USB port
Rated current:
35 mA (without load on RS-485 side)
USB / RS-485 galvanic separation:
No
Work temperature:
0 .. +50 C
Store temperature:
-20 .. +60 C
Dimensions (without terminals) length x
width x height:
56mm x 31mm x 25mm
Weight:
About: 25g
USB:
Standard:
In compliance with USB 2.0
RS-485:
Baud rate:
300 bps .. 115.2 kbps
Maximal number of transmitters / receivers:
32
Different output voltage (TxD):
Nominal: 5 V for RL=∞
Min.: 1.5 V for RL=54 Ω
Receiver input resistance (RxD):
12 k
Minimal input voltage (RxD):
0.2 V
Acceptable voltage on A,B terminals:
+/-12 V (max)
Short-circuit protection:
Yes
Line RS-485 terminating resistor:
220 Ω + 2 x 390 Ω, external
Others:
Power supply:
From USB port
Rated current:
Max 350 mA (nominal work)
USB / RS-485 galvanic separation:
500 V
Work temperature:
0 .. +50 C
Store temperature:
-20 .. +60 C
Dimensions (without terminals) length x
width x height:
93mm x 57mm x 21mm
Weight:
About 65g
9. Technical specification
CONV485USB:
CONV485USB / CONV485USB-I
CONV485USB-I:
CONV485USB / CONV485USB-I
7
Converter
1 pc
Six-position pin type screw terminal strip
1 pc
only CONV485USB-I
Two-position pin type screw terminal strip
1 pc
only CONV485USB
Mounting kit for 35 mm DIN rail
2 pcs
only CONV485USB-I
USB A/B cable 1.8 m
1 pc
CD with installation software and full manual
1 pc
Quick start guide
1 pc
10. Delivery contents
The device is compliant with the EMC requirements (electromagnetic compatibility of
industrial devices), according to Directive 2004/108/EEC.
11. Entity launching the product on the EU market
Manufacturer: METRONIC AKP s.c.
PL 31-261 Kraków, ul. Wybickiego 7
Phone No.: / Fax: +48 126330873
www.metronic.pl
Sales Department:
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