Elo TouchSystems E222 User Manual

Communication adapter

RS485/422 over the Ethernet

ELO E222

User manual

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Table Of Content:

1.0 Introduction............................................................................3

1.1 Application ........................................................................ 3

2.0 How does it works?................................................................4

3.0 Installation.............................................................................. 4

3.1 Ethernet connection...........................................................4

3.2 RS485/RS422 connection..................................................5

3.3 Power supply..................................................................... 6

3.4 Driver installation..............................................................6

3.5 Virtual COM port installation............................................7

3.6 Uninstalling the adapter drivers ........................................9

3.7 Virtual Port settings...........................................................9

3.8 Adapter configuration over the web interface...................9

3.9 Serial Port profiles...........................................................12

3.10 Setting to a RS485 mode............................................... 14

4.0 Testing..................................................................................16

5.0 Troubleshooting ................................................................... 17

6.0 Ordering info........................................................................ 17

7.0 Technical info.......................................................................18

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1.0 Introduction

Ethernet as a communication medium becomes widely used not only in
commercial domain, but becomes more popular in industry automation
too. A RS485/422 interfaces are intended to connect multiple devices for
distances up to 1600m; RS485 allows half-duplex communication, while
RS422 full-duplex. An adapter E222 allows to integrate the RS485 or
RS422 devices into the Ethernet network thereby bridge long distances.

Bellow described adapter allows to connect RS485/RS422 devices
together over the Ethernet network; it also allows to connect more devices
to a single network gateway (i.e. computer).

1.1 Application

This communication device altogether with supplied software allows
setting up following profiles:

1) Real Port profile. Adapter allows to connect a device with

RS485/422 interface straight to computer via Ethernet protocol
with virtual port application installed on,

2) Serial Bridge profile. Adapter connects two devices with

RS485/422 interfaces like they were connected by cable; it is
technique so called “serial tunneling”

3) TCP socket profile. Configured as TCP client or TCP server,

establishes connection among these devices

4) UDP socket profile. Configured as UDP client or UDP server,

establishes connection among these devices.

5) Custom profile. Experienced user can access all settings both

network and serial interfaces.

2.0 How does it works?

The adapter converts RS485/422 signaling to the Ethernet interface. In
half-duplex mode selected, it can drive the transmitting direction
automatically. RS485/422 interface is presented with DB9M (D-SUB,
Canon, male), whereas Ethernet is lead out via standard Ethernet RJ-45
socket.

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Adapter can operate with half/full duplex with maximal bitrate 230kbps.
The Ethernet layer can communicate with 10 and 100Mbps.

It should be considered, that data stream can be packetized and possible
delayed because of the nature of the Ethernet and its anticollision
mechanism.

3.0 Installation

This chapter describes the adapter E222 installation process. The
process is divided to two sub-processes - software and hardware
installation.

3.1 Ethernet connection

Adapter meets IEEE 802.3 specification and is to be plugged in to the
network with straight UTP cable. When connecting two devices together,
the cross-over cable should be used instead.

For the first time, the adapter is configured to acquire IP address from
DHCP server, so in the network must be such a service to dedicate IP
address (e.g. AP – access point, router...). It can be later changed to the
fixed IP address.

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3.2 RS485/RS422 connection

A DB9M (D-SUB 9 pin Male) connector is wired as shown on Pic. 1.
The brief description of the signal names is given in Tab. 1.

Signal Abbrev. DB9M Direction Mode

Transmitted Data + Tx+ 2 OUT
Transmitted Data - Tx- 7 OUT
Received Data + RxTx+ 3 IN
Received Data - RxTx- 8 IN

RS422

Data + RxTx+ 3 OUT/IN
Data - RxTx- 8 OUT/IN

RS485

Ground GND 5 - Both

Tab. 1: DB9M Pin description

Tx+

Rx+ /

RxTx+

GND

/

GND

RS485/RS422 connector - front view
Pic. 1

Tx-

Rx- / RxTx

-

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The operation mode can be selected by DIP-switches located near the
Power connector. Their meaning is shown on the converter's labels, and
on the Pic. 2.

Switch No. 1 switches between RS485 and RS422 mode.
No. 2 enables passive termination of the Rx bus when in
RS422 mode or of the all RS485 bus
No. 3 nad 4 - active terminator when in RS485 mode
No. 5 enables passive termination of the Tx bus @ RS422
mode

Rx and Tx activity is indicated by LED indicators.

3.3 Power supply

The adapter can be powered with DC voltage source (range 9 to 24V)
with DC connector (outer/inner diameter is 5.5/2.1 mm), inner pin should
have positive polarity. The adapter can be powered via DB9M connector
too – positive is pin No.9, negative (ground) is pin No.5. Powered status is
indicated with green LED. The adapter is secured against the polarity
change.

3.4 Driver installation

The adapter's configuration software can operate on computers under
Operation systems both MS Windows and Linux/Unix, but only Windows
software is enclosed. Supported are version from

Win98 to Win7.

Unix/Linux software can be downloaded from following address:

Pic.

1: DIP-switch description