USB – RS-485 Communication adapter
- virtual serial port
ELO E218
Operation manual
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1.0 Introduction.................................................................................3
1.1 Use of the adapter........................................................................3
2.0 Operation principles....................................................................3
3.0 Installation..................................................................................3
3.1 USB interface connection............................................................3
3.2 RS-485 Installing.........................................................................3
3.2.1 VW3A8E214 version.................................................................4
3.3 Installing driver...........................................................................4
3.3.1 Installing virtual port under Windows XP................................4
3.3.2 Uninstalling virtual port under Windows XP...........................5
3.3.3 Virtual port properties setting...................................................6
4.0 Specification................................................................................6
4.1 Parameters...................................................................................6
4.2 Other............................................................................................6
5.0 Testing.........................................................................................7
6.0 Troubleshooting...........................................................................7
7.0 Ordering information..................................................................7
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1.0 Introduction
The USB interface is preferred to the COM port with RS-232 interface in personal
computer technology. To connect the peripheral devices of the RS-232 interface, the
USB/RS-232 adapters along with the driver are applied to create so-called virtual
COM on the PC.
ELO E218 is a device which converts virtual COM to the asynchronous line of the
symmetric signal via the USB interface. The signals transmission to the half-duplex
RS-485 interface allows the range, communication partners´ number and the
transmission interference immunity to increase.
1.1 Use of the adapter
he converter increases transmission immunity against electrical disturbance hence it is
intended to be used in the environments where lightning over-voltage is not necessary
to be considered. The adapter allows the transmission rate up to 1 Mbps. This
maximum attainable rate decreases due to the line length and/or its impedance growth.
Recommended maximum line length is 1200 m at the rate of 9600 bps.
2.0 Operation principles
The adapter E218 converts the RS-485
interface to the USB interface, transmits
TxD and RxD signals. The transmission is
half-duplex that means switching on the RS485 transmitter only during its own
transmitting to allow other communication
partners (max.32) to transmit. The RS-485
transmitter is automatically controlled.
There are two LED indicators - READY and
DATA. READY indicates that drivers are installed correctly, DATA indicates that
data are transmitted (red) or received (green) over RS-485.
Adapter is supplied from USB port
3.0 Installation
E218 adapter installation is described in this part. There are two problems to be
solved: the hardware installation and the SW driver installation.
3.1 USB interface connection
The adapter operates as per specification USB 2.0 full-speed (12 Mbps). The USB
adapter connector is of A male type.
3.2 RS-485 Installing
Model ELO E218 can be supplied with various RS485 connectors.
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3.2.1 VW3A8E214 version
To built a two-point connection a local adapters’
contact Tx+ (Tx-) must be connected to Rx+ (Rx-)
contact of remote one and local Rx+ (Rx-) to
remote Tx+ (Tx-). RS-485 interface is equipped with
RJ45 connector (see the symbolic picture).
Contacts meaning :
1 Nc 5 TxRx- (D0)
2 Nc 6 Nc
3 Nc 7 Nc
4 TxRx+ (D1) 8 GND
There is a terminátor 150 Ohm between the contacts 4-5 (TxRx).
3.3 Installing driver
The E218 adapter may be applied on the PC computers under the MS Windows
98/Me/2000/XP, Vista or Linux. The drivers are supplied together with the other files
at the installation CD. They may be downloaded from the producer web-sides
www.elo.cz.
The proper installation of the drivers is indicated via the lit READY indicator on the
cover connected to the adapter.
Following part of the user manual describes the process of installing under MS
Windows XP only.
3.3.1 Installing virtual port under Windows XP
1. When the PC turned on and the adapter connected to the USB port via the cable is
detected the operating system reports a new hardware has been found: Nalezen
nový hardware: ELO E218 Adapter.
2. The system runs the Add New Hardware Wizard automatically. Failing this, the
Control panel may be used to start the Wizard. Select the third option in the
Wizard menu - „Ne, nyní ne“ („No, not now“) – and click the button „Další“
(„Next“):
3. Select the second option in the Wizard menu „Instalovat ze seznamu či daného
umístění“ (“Install from a list or specific location”) and click „Další“ („Next“):
4. In the next Wizard menu select „Při hledání zahrnout toto umístění“ and by the
help of button „Procházet“ („Browse“) select the directory e218_drivers on the
supplied CD. Then click „Další“ („Next“):
5. Don’t be worry if the Wizzard will write: „Warning“ and click „Pokračovat“
(„Continue“)::
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6. Now click “Finish” in the dialog box of the installing device completion.
7. Then it is necessary to continue with the virtual port installation. System will write
„New hardware found“ again and the installation is running the same way as
shown in steps from 2 to 4:
8. When the correct drivers of virtual COM port are found a new Warning is
displayed. Click „Pokračovat“ („Continue“):
9. The virtual COM port
installation has been
completed:
10. Nalezen nový hardware
(„New hardware found and
prepared for use“). READY
indicates that drivers are installed correctly.
3.3.2 Uninstalling virtual port under Windows XP
Adapter E218 must be connected to PC during the process of uninstalling.
1. Select the part Přidat nebo odebrat programy (Add or remove programs) from
Ovládací panely (Control panels). hen select the row E218 RS485-USB Adapter.
Press button Změnit nebo odebrat (Change or remove) and confirm by pressing
Ano. (Yes) Adapter and its drivers are uninstalled:
2. Pressing button „OK“ you’ll confirm uninstalling
3. After the uninstalling the LED „READY“ will switch off.
Adapter E218 can be disconnected.
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3.3.3 Virtual port properties setting
When connection is established the adapter virtual port appears as the next COM port
in the Správce zařízení. (Device
Manager) Go to Ovládací panely
(Control panel) and select System /
Hardware and run the Správce zařízení
(Device Manager). The next COM called
E218 RS485-USB Adapter has appeared
among the Ports. In Vlastnosti
(Properties), its setting, e.g. data rate,
character format and/or flow control can
be changed. Caution!!! The control
signals are not transmitted hence no
hardware flow control can be used.
Pod volbou The port number assignment
(e.g. COM3, COM4,) may be changed
under the Upřesnit (Specify option).
4.0 Specification
4.1 Parameters
USB interface USB 2.0 full-speed (12Mb/s)
USB connector typ A - male
RS485 connector, RJ45
Terminator internal 150 Ohm
Transmission mode asynchronous, half-duplex
Maximum data rate 921 600 kbps
4.2 Other
Supply from USB interface
Power take-off max. 100 mA
Length 2300 mm
Weight cca 100 g
Skladovací teplota - 10o to +55 oC
Working temperature + 0o to +50 oC
Humidity 0 – 85% (non-condensing)
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5.0 Testing
The proper installation of ELO E218 and the drivers is indicated via the lit READY
indicator on the cover connected to the adapter.
TxD – RxD indicator must blink when the data are transmitted. It is necessary to use
two pieces of E218, connect them (see chapter 3.2). PC with SW HyperTerminal can
serve as typical end device.
6.0 Troubleshooting
Symptom Action
Adapter does not work after
installation
Check if the cable is connected properly.
Check if READY is alight
Unplug and plug USB connector.
Repeat the driver installation
Connection in normal operation quit
working.
Check if READY is alight.
Check the cable connection.
RS485-USB adapter is absent in
Device Manager
Unplug and plug USB connector. If
necessary repeat the driver installation
7.0 Ordering information
Objednací kód je ELO E218 or VW3A8E214. The adapter is supplied with the
installation CD and this manual.
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