Lantronix MSS 485 User Manual

0 (0)

NET485

RS422/485 Serial to Ethernet Adapter

Revision C March 24, 2006

Part Number GC-800-240

Copyright and Trademark

Copyright © 2005, Grid Connect, Inc. All rights reserved.

No part of this manual may be reproduced or transmitted in any form for any purpose other than the purchaser's personal use, without the express written permission of Grid Connect, Inc. Grid Connect, Inc. has made every effort to provide complete details about the product in this manual, but makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability or fitness for a particular purpose. In no event shall Grid Connect, Inc. be liable for any incidental, special, indirect, or consequential damages whatsoever included but not limited to lost profits arising out of errors or omissions in this manual or the information contained herein.

Grid Connect, Inc. products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or in any other application in which the failure of a Grid Connect, Inc. product could create a situation where personal injury, death, or severe property or environmental damage may occur. Grid Connect, Inc. reserves the right to discontinue or make changes to its products at any time without notice.

Grid Connect and the Grid Connect logo, and combinations thereof are registered trademarks of Grid Connect, Inc. DSTni is a trademark of Lantronix, Inc. All other product names, company names, logos or other designations mentioned herein are trademarks of their respective owners.

Wi232, NET232, NET485 and NETUSB are trademarks of Grid Connect, Inc. XPort is a trademark of Lantronix. Ethernet is a trademark of XEROX Corporation. UNIX is a registered trademark of The Open Group. Windows 95, Windows 98, Windows 2000, Windows NT, and Windows XP are trademarks of Microsoft Corp. Netscape is a trademark of Netscape Communications Corporation.

Grid Connect

1841 Centre Point Circle, Suite 143 Naperville, IL 60563, USA

Phone: 630.245.1445

Technical Support

Phone: 630.245.1445

Fax: 630.245.1717

On-line: www.gridconnect.com

NET485 User Guide

i

Disclaimer and Revisions

Operation of this equipment in a residential area is likely to cause interference in which case the user, at his or her own expense, will be required to take whatever measures may be required to correct the interference.

Attention: This product has been designed to comply with the limits for a Class B digital device pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with this guide, may cause harmful interference to radio communications.

Changes or modifications to this device not explicitly approved by Grid Connect will void the user's authority to operate this device.

The information in this guide may change without notice. The manufacturer assumes no responsibility for any errors that may appear in this guide.

Date

Rev.

Author

Comments

05/17/05

A

GR

Preliminary Release

06/23/05

B

GR

Add notes about Product Info Base, Java RE, .NET

03/24/06

C

GR

Firmware to 6.1.0.2 and Web Manager update

ii

NET485 User Guide

Warranty

Grid Connect warrants each product to be free from defects in material and workmanship for a period of ONE YEAR after the date of shipment. During this period, if a customer is unable to resolve a product problem with Grid Connect Technical Support, a Return Material Authorization (RMA) will be issued. Following receipt of a RMA number, the customer shall return the product to Grid Connect, freight prepaid. Upon verification of warranty, Grid Connect will -- at its option -- repair or replace the product and return it to the customer freight prepaid. If the product is not under warranty, the customer may have Grid Connect repair the unit on a fee basis or return it. No services are handled at the customer's site under this warranty. This warranty is voided if the customer uses the product in an unauthorized or improper way, or in an environment for which it was not designed.

Grid Connect warrants the media containing software and technical information to be free from defects and warrants that the software will operate substantially for a period of 60 DAYS after the date of shipment.

In no event will Grid Connect be responsible to the user in contract, in tort (including negligence), strict liability or otherwise for any special, indirect, incidental or consequential damage or loss of equipment, plant or power system, cost of capital, loss of profits or revenues, cost of replacement power, additional expenses in the use of existing software, hardware, equipment or facilities, or claims against the user by its employees or customers resulting from the use of the information, recommendations, descriptions and safety notations supplied by Grid Connect. Grid Connect liability is limited (at its election) to:

1)refund of buyer's purchase price for such affected products (without interest)

2)repair or replacement of such products, provided that the buyer follows the above procedures.

There are no understandings, agreements, representations or warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose, other than those specifically set out above or by any existing contract between the parties. The contents of this document shall not become part of or modify any prior or existing agreement, commitment or relationship.

NET485 User Guide

iii

Contents

Table of Contents

1. NET485 Overview ............................................................................................................

1-1

1.1

Overview.............................................................................................................

1-1

1.2

Overview of RS422 / RS485...............................................................................

1-1

 

1.2.1 The RS485 Enable Signal ...................................................................

1-2

 

1.2.2 NET485 Wiring...................................................................................

1-2

1.3

RS422 / RS485 Network connections.................................................................

1-4

 

1.3.1 RS422 Networks .................................................................................

1-4

 

1.3.2 RS485 Networks .................................................................................

1-5

2. Introduction......................................................................................................................

2-1

2.1

Protocol Support .................................................................................................

2-1

2.2

Serial RS422/485 Interface .................................................................................

2-2

2.3

Power Supply ......................................................................................................

2-2

2.4

Ethernet Interface ................................................................................................

2-3

2.5

Product CD..........................................................................................................

2-4

2.6

Additional Documentation ..................................................................................

2-5

2.7

Technical Specifications .....................................................................................

2-6

3. Device Installer.................................................................................................................

3-1

 

3.1.1 Microsoft NET Framework.................................................................

3-1

 

3.1.2 Install Device Installer ........................................................................

3-1

 

3.1.3 RUN Device Installer..........................................................................

3-2

 

3.1.4 Device Found ......................................................................................

3-2

 

3.1.5 Assign IP .............................................................................................

3-3

 

3.1.6 Assignment..........................................................................................

3-4

3.2

Using Device Installer.........................................................................................

3-5

 

3.2.1 Viewing the Current Configuration ....................................................

3-5

3.3

Configuration Using Web Manager ....................................................................

3-7

 

3.3.1 Accessing XPort Using Device Installer.............................................

3-7

3.4

Network Configuration .......................................................................................

3-8

 

3.4.1 Automatic IP Address Configuration..................................................

3-8

 

3.4.2 Static IP Address Configuration..........................................................

3-9

 

3.4.3 Ethernet Configuration........................................................................

3-9

3.5

Server Configuration.........................................................................................

3-10

3.6

Host List Configuration.....................................................................................

3-11

3.7

Channel 1 Configuration ...................................................................................

3-12

 

3.7.1 Connection Settings - TCP................................................................

3-14

 

3.7.2 Connection Settings - UDP ...............................................................

3-17

3.8

Email Settings ...................................................................................................

3-18

 

3.8.1 Trigger Configuration .......................................................................

3-19

3.9

Configurable Pin Settings .................................................................................

3-20

3.10 Apply Settings.................................................................................................

3-20

3.11 Apply Factory Defaults ...................................................................................

3-21

3.12 Configuration Using Telnet.............................................................................

3-21

iv

NET485 User Guide

Contents

3.12.1 Telnet Connection............................................................................

3-21

3.12.2 Telnet Messages ..............................................................................

3-22

3.13 Server Configuration (Option 0 Network Configuration) ...............................

3-24

3.13.1 IP Address .......................................................................................

3-24

3.13.2 Set Gateway IP Address ..................................................................

3-24

3.13.3 Netmask: Number of Bits for Host Part ..........................................

3-24

3.13.4 Change Telnet configuration password ...........................................

3-25

3.13.5 DHCP Naming.................................................................................

3-26

3.14 Channel 1 Configuration (Serial Port Parameters) ..........................................

3-26

3.14.1 Baudrate...........................................................................................

3-26

3.14.2 I/F (Interface) Mode ........................................................................

3-27

3.14.3 Flow.................................................................................................

3-27

3.14.4 Port Number ....................................................................................

3-28

3.14.5 Connect Mode .................................................................................

3-29

3.14.6 Send the Escape Sequence (+++) in Modem Mode.........................

3-34

3.14.7 Auto Increment Source Port ............................................................

3-34

3.14.8 Remote IP Address ..........................................................................

3-35

3.14.9 Remote Port .....................................................................................

3-35

3.14.10 DisConnMode................................................................................

3-35

3.14.11 Flush Mode (Buffer Flushing).......................................................

3-36

3.14.12 Pack Control ..................................................................................

3-37

3.14.13 DisConnTime (Inactivity Timeout) ...............................................

3-37

3.14.14 Send Characters .............................................................................

3-38

3.14.15 Telnet Terminal Type ....................................................................

3-38

3.14.16 Channel (Port) Password ...............................................................

3-38

3.15 E-mail Settings ................................................................................................

3-38

3.15.1 E-mail Setup ....................................................................................

3-39

3.15.2 Trigger Setup ...................................................................................

3-39

3.16 Expert Settings.................................................................................................

3-40

3.16.1 TCP Keepalive time in seconds.......................................................

3-40

3.16.2 ARP Cache timeout in seconds .......................................................

3-40

3.16.3 Enable High Performance................................................................

3-40

3.16.4 Disable Monitor Mode at Bootup....................................................

3-40

3.16.5 RS-485 TX Enable Active Level.....................................................

3-40

3.16.6 HTTP Port Number .........................................................................

3-41

3.16.7 SMTP Port Number .........................................................................

3-41

3.16.8 MTU Size ........................................................................................

3-41

3.16.9 Enable Alternate MAC ....................................................................

3-41

3.16.10 Ethernet Connection Type .............................................................

3-41

3.17 Security Settings ..............................................................................................

3-42

3.17.1 Disable SNMP .................................................................................

3-42

3.17.2 SNMP Community Name................................................................

3-42

3.17.3 Disable Telnet Setup........................................................................

3-42

3.17.4 Disable TFTP Firmware Upgrade ...................................................

3-42

3.17.5 Disable Port 77FE (Hex) .................................................................

3-43

3.17.6 Disable Web Server .........................................................................

3-43

3.17.7 Disable Web Setup ..........................................................................

3-43

3.17.8 Disable ECHO Ports........................................................................

3-43

3.17.9 Enable Encryption ...........................................................................

3-43

3.17.10 Enable Enhanced Password ...........................................................

3-44

3.17.11 Disable Port 77F0 (Hex)................................................................

3-44

NET485 User Guide

v

Contents

 

 

3.18 Defaults ...........................................................................................................

3-44

 

3.19 Exit Configuration Mode ................................................................................

3-44

4.

Monitoring the Network ..................................................................................................

4-1

 

4.1.1 Entering Monitor Mode via the Network Port ....................................

4-1

 

4.1.2 Monitor Mode Commands ..................................................................

4-1

5.

Updating Firmware..........................................................................................................

5-1

 

5.1 Obtaining Firmware ............................................................................................

5-1

 

5.1.1 Reloading Firmware............................................................................

5-1

 

5.1.2 Via Device Installer ............................................................................

5-1

6.

Troubleshooting................................................................................................................

6-1

 

6.1.1 Problems and Error Messages.............................................................

6-1

7.

Binary to Hex Conversion ...............................................................................................

7-1

 

7.1.1 Conversion Table ................................................................................

7-1

 

7.1.2 Scientific Calculator............................................................................

7-1

List of Figures

Figure 1 - RS485 Transceiver ................................................................................................

1-3

Figure 2 - RS422 Four Wire Interface ...................................................................................

1-4

Figure 3 - RS485 Network .....................................................................................................

1-5

Figure 4 - Main Features ........................................................................................................

2-1

Figure 5 - Phoenix Connector ................................................................................................

2-2

Figure 6

- Ethernet Jack .........................................................................................................

2-3

Figure 7

- CD Browser Main Window...................................................................................

3-1

Figure 8

- Device Installer Dialog Box ..................................................................................

3-2

Figure 9

– Device Installer.....................................................................................................

3-5

Figure 10 - Setup Mode Window.........................................................................................

3-23

Figure 11 - Hostlist Option ..................................................................................................

3-31

vi

NET485 User Guide

Contents

List of Tables

Table 1 - RS422/485 Signals ..................................................................................................

2-2

Table 2 - NET485 LED Functions..........................................................................................

2-3

Table 3 - Technical Specs.......................................................................................................

2-6

Table 4 - Standard IP Network Netmasks ............................................................................

3-24

Table 5 - Netmask Examples................................................................................................

3-25

Table 6

- Interface Mode Options.........................................................................................

3-27

Table 7

- Common Interface Mode Settings.........................................................................

3-27

Table 8

- Flow Control Options............................................................................................

3-27

Table 9

- Reserved Ports.......................................................................................................

3-28

Table 10 - Connect Mode Options........................................................................................

3-29

Table 11 - Manual Connection Address Example ................................................................

3-31

Table 12

- Modem Mode Commands...................................................................................

3-34

Table 13

- Disconnect Mode Options...................................................................................

3-35

Table 14

- Flush Mode Options ............................................................................................

3-36

Table 15

- Pack Control Options ..........................................................................................

3-37

NET485 User Guide

vii

Overview

1. NET485 Overview

1.1 Overview

The NET485 product allows you to connect to an RS422 / RS485 transceiver to enable remote serial communications over long distances (up to 4,000 ft.). Using RS485 two-wire mode, you can also connect the NET485’s serial interface to multiple devices in a multi-drop network. The NET485 is designed around the XPort-03 Serial to Ethernet device server.

1.2 Overview of RS422 / RS485

RS232 is an EIA standard transmission system and has been around since 1962. RS232 provides singleended data communications between a transmitter and a receiver. It allows for data transmission from one transmitter to one receiver at relatively slow data rates (115k bits / second) and short distances (up to 50 ft. at the maximum data rate).

While RS232 is well-known for connecting PC's to external devices, RS422 and RS485 are not as well known. When communicating at high data rates, or over long distances in real world environments, singleended methods are often inadequate. RS422 and RS485 were designed to provide data communications over longer distances, higher Baud rates and provide better immunity to external electro-magnetic noise.

RS422 and RS485 use differential data transmission (balanced differential signal). This offers superior performance by canceling the effects of ground shifts and induced noise signals that can appear as common mode voltages on a network. This also allows for data transmission at much higher data rates (up to 460K bits / second) and longer distances (up to 4000 ft).

What is the difference between RS422 and RS485? Like RS232, RS422 is intended for point-to-point communications. In a typical application, RS422 uses four wires (two separate Twisted Pairs of wires) to transfer data in both directions simultaneously (Full Duplex) or independently (Half Duplex). EIA/TIA-422 specifies the use of one, unidirectional driver (transmitter) with a maximum of 10 receivers. RS422 is often used in noisy industrial environments or to extend a RS232 line.

RS485 is used in applications where multiple devices want to share data communications on a single serial network. RS485 can support up to 32 drivers and 32 receivers on a single two wire (one twisted pair) bus. Most RS485 systems use a Master/Slave architecture, where each slave unit has its unique address and responds only to packets addressed to it. However, peer to peer networks are also possible.

Specification

RS-422

RS-485

Transmission Type

Differential

Differential

Maximum Data Rate

10 MB/s

10 MB/s

Maximum Cable Length

4000 ft.

4000 ft.

Minimum driver Output Voltage

+/- 2V

+/- 1.5V

Driver Load Impedance

100 Ohm

54 Ohm

Receiver Input Resistance

4 KOhm min

12 KOhm min

Receiver Input Sensitivity

+/- 200mV

+/- 200mV

Receiver Input Voltage Range

-7V to +7V

-7V to +12V

No of Drivers Per Line

1

32

No of Receivers Per Line

10

32

NET485 User Guide

1-1

Overview

1.2.1 The RS485 Enable Signal

In a balanced differential system the data signals are produced by a line driver. The line driver generates a voltage across a pair of signal wires that transmits the data signals. A balanced line driver can have an optional input signal called an “Enable” signal. The purpose of the enable signal is to connect the driver to its output terminals. If the enable signal is off, the driver is disconnected from the transmission line. When a driver is disconnected from the network it is referred to as being in the “tri-state” condition. Because there are multiple drivers (transmitters) on a RS485 network and only one transmitter can be enabled at a time, the use of this enable control signal is required on all RS485 networks.

The XPort provides this enable signal for RS485 two-wire applications. When configured for RS485 twowire applications, the XPort automatically asserts the enable when it is ready to transmit data from its serial port. Once the data has been transmitted, the XPort automatically de-asserts the enable signal to allow other nodes to transmit their data.

1.2.2 NET485 Wiring

NOTE: You cannot configure the NET485 through the serial port. The boot program has no control over the Configurable Pins, so the NET485 will never be able to send data during the boot period (initial 5 seconds).

The XPort can be configured to use any one of the three configurable PIO pins as the RS485_TXEN enable. The NET485 uses CP1 for the transmit enable. You must enable CP1 for RS485_TXEN during the configuration process. (See the Quick Start Guide for details)

Note: CP1 is the hardware designation for the XPort physical pin #6. In the web configuration menus, this pin is called CP0.

You can set the active state of the control pins to LOW or HIGH. The NET485 uses CP1 in the Active High condition. You must set CP1 to Active High during the configuration process. (See the Quick Start Guide for details)

Note: CP1 is the hardware designation for the XPort physical pin #6. In the web configuration menus, this pin is called CP0.

1-2

NET485 User Guide

Overview

The NET485 can handle both RS485 and RS422 communications. This is done by connecting the XPort to a pair of RS485 transceivers. The following schematic demonstrates how the circuit is wired for RS422 and RS485.

3.3V

3.3V

2

 

U2

 

8

Vcc

 

 

3

DE

Vcc

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

4

 

D

 

 

 

 

TX

 

 

DI

 

RS422

RS485

 

 

 

 

 

 

 

 

 

 

 

 

 

Half-Duplex

Mode

 

 

 

 

 

 

6

Mode

 

 

 

 

1

 

 

TXDA (Pin 7)

TXDA (Pin 7)

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

3.3V

RO

7

TXDB (Pin 6)

TXDB (Pin 6)

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

XPort 485

 

 

 

RE

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

6

R13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CP1

10K

 

 

3.3V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

U4

 

 

 

 

 

3

 

 

 

 

 

 

 

DE

Vcc

 

 

 

 

 

 

 

 

 

 

 

 

 

3.3V

4

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DI

 

 

 

 

 

5

 

1

 

 

6

RXDA (Pin 5)

RXDA (Pin 5)

 

 

 

R

 

 

RX

 

 

RO

7

RXDB (Pin 4)

RXDB (Pin 4)

 

 

 

 

 

 

 

 

2

 

 

 

 

 

3

2

 

 

 

 

 

GND

J2

1

 

RE

GND

 

 

 

 

 

 

 

 

1

 

 

 

 

5

 

SGND (Pin 3)

SGND (Pin 3)

Figure 1 - RS485 Transceiver

The transmit section of the XPort is labeled TX on pin 4. The receive section of the XPort is labeled RX on pin 5. Note that the CP1 pin on the XPort pin 6, which is configured to control the level of RS485_TXEN, is connected to both transceivers. The transmit section is enabled with a High signal on pin 3, U2 and the receive section is enabled with a Low signal on pin 2, U4.

There is a jumper option J2 that permits RS485/RS422 Half Duplex or RS422 Full Duplex. With the jumper in the factory set position between pins 2 and 3, the unit is set for RS485/RS422 Half Duplex.

For RS422 mode, use the four signals produced by the two transceivers plus a signal ground.

For RS485 mode, the TXDA signal is jumpered to the RXDA terminal, and the TXDB signal is jumpered to the RXDB terminal. The three signals are TXDA, RXDB, and signal ground.

NET485 User Guide

1-3

Overview

1.3 RS422 / RS485 Network connections

1.3.1 RS422 Networks

A typical RS422 application uses a four-wire interface (two twisted pairs) and a shield. RS422 networks are often used in a half-duplex mode, where a single master in a system sends a command to a slave device and the slave responds with data. Typically one device (node) is addressed by the host computer and a response is received from that device. Systems of this type (4-wire, half-duplex) are often constructed to avoid "data collision" (bus contention) problems on a network. Figure 2 shows a typical RS422 four wire interface.

CP1

DE

 

 

 

 

4000 ft.

 

 

DE

 

 

 

 

 

 

 

 

 

 

 

 

 

TX

 

 

D

 

 

 

 

 

 

DI

 

 

 

 

 

 

 

 

 

DI

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXDA (Pin 7)

TXDA

 

 

 

 

 

R

 

 

 

 

Rt

 

 

 

 

RO

 

 

 

TXDB (Pin 6)

TXDB

RO

 

 

 

 

 

 

 

D

R

CP1

TX

DE

DE

DI

RX

RO

CP1

D

R

 

 

 

 

 

 

 

 

RXDA

 

 

DI

 

 

 

 

 

RXDA (Pin 5)

 

 

 

 

 

 

 

 

 

 

 

Rt

 

 

 

 

 

 

 

 

 

RXDB (Pin 4)

 

RXDB

 

RO

 

 

 

 

 

SGND (Pin 3)

 

SGND

 

 

 

Rg

 

 

 

 

 

 

 

 

 

 

 

Rg

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

R

RX

CP1

Figure 2 - RS422 Four Wire Interface

Notice that 5 conductors are used (two twisted pairs and a ground wire). Also, when the cable lengths are long and/or the data rates are high, the network must be terminated. To terminate the network, a resistor Rt is added in parallel with the receiver’s A and B lines. Rg is an optional resistor between ground and the shield. Rt termination resistors are available as option jumpers on the NET485.

Note: Do NOT install termination resistors on short wire networks. See the Application Notes on the product CD for more information about networks and termination procedures.

1-4

NET485 User Guide

Lantronix MSS 485 User Manual

Overview

1.3.2 RS485 Networks

RS485 permits a balanced transmission line to be shared in a party line or multi-drop configuration. As many as 32 driver / receiver pairs can share a multi-drop network on a single two wire bus. The length of the network is limited to 4,000 ft. between the first node and the last node. RS485 can be used in two-wire or four-wire multi-drop network applications.

Figure 3 shows a typical RS485 two-wire multi-drop network. The tri-state capabilities of 485 allow a single pair of wires to share transmit and receive signals for half-duplex communications. In this configuration, it is important to prevent more than one device from transmitting at the same time. This is controlled by software and the communications protocol. Note that the transmission line is terminated on both ends of the line but not at drop points in the middle of the line. Termination is only required with high data rates and / or long wire runs.

Note: Do NOT install termination resistors on short wire networks. See the Application Notes on the product CD for more information about networks and termination procedures.

CP1

DE

 

 

 

TX

DI

D

 

SGND (Pin 3)

 

 

 

 

TXDA (Pin 7)

 

RO

R

 

TXDB (Pin 6)

 

 

 

DE

 

 

 

D

 

DI

 

 

 

RXDA (Pin 5)

RX

RO

R

 

 

 

 

RXDB (Pin 4)

CP1

 

 

Figure 3 - RS485 Network

DE

 

CP1

 

 

DI

D

TX

SGND

 

 

TXDA

 

 

RO

R

 

 

 

DE

 

 

 

D

 

DI

 

 

RO

R

RX

 

 

RXDB

 

 

 

 

CP1

DE

 

CP1

 

 

DI

D

TX

SGND

 

 

TXDA

 

 

RO

R

 

 

 

DE

 

 

 

D

 

DI

 

 

RO

R

RX

 

 

RXDB

 

 

 

 

CP1

NET485 User Guide

1-5

Introduction

2. Introduction

The NET485 product allows you to connect an RS422 / RS485 transceiver to the Ethernet. Using RS485 two-wire mode, you can connect the NET485’s serial interface to multiple devices in a multi-drop network.

To quickly setup the NET485, please refer to the Quick Start Guide. This section discusses the general details of the NET485.

Terminator Jumpers

Ethernet Connection

RS422/485 Terminals

Power LED

 

Power Terminals

 

Figure 4 - Main Features

2.1 Protocol Support

The NET485 uses the Internet Protocol (IP) for network communications and the Transmission Control Protocol (TCP) to assure that no data is lost or duplicated and that everything sent to the connection arrives correctly at the target.

Other supported protocols include:

ARP, UDP, TCP, ICMP, Telnet, TFTP, AutoIP, DHCP, HTTP, and SNMP for network communications and management.

TCP, UDP, and Telnet for connections to the serial port.

TFTP for firmware and web page updates.

IP for addressing, routing, and data block handling over the network.

User Datagram Protocol (UDP) for typical datagram applications in which devices interact with other devices without maintaining a point-to-point connection.

NET485 User Guide

2-1

Introduction

2.2 Serial RS422/485 Interface

The table below lists the RS422/485 signals for the NET485. The RS422/485 and power interface is a 7-pin removable Phoenix connector, with two of the pins used for power.

Table 1 - RS422/485 Signals

NET485 Signal

7-Pin Phoenix

TXDA

7

TXDB

6

RXDA

5

RXDB

4

SGND

3

GND

2

8-24VDC

1

RX TERM TX TERM TXDA TXDB RXDA RXDB SGND GND 8-24VDC

Figure 5 - Phoenix Connector

The NET485 uses protective clamping structures on its inputs and outputs that clamp the voltage to a safe level and dissipate the energy present in ESD (electrostatic) and EFT (electrical fast transients) discharges. This protection structure achieves ESD protection up to 8 kV according to IEC1000-4-2, and EFT protection up to 2 kV on all input/output (I/O) lines.

The NET485 has jumper terminals for adding termination resistors to the RX and TX lines. Add these jumpers ONLY if you have long transmission lines and termination resistors are needed.

Note: Do NOT use RX Term and TX Term jumpers on short transmission lines. Remove these jumpers to remove the 120 Ohm resistors from the transmit and receive lines.

Note: See the Application Notes on the product CD for more information about networks and termination procedures.

2.3 Power Supply

The NET485 can use any DC power source from 8VDC to 24VDC. The current draw is determined by network activity and serial port communications. In general, a 500ma supply will handle the load.

Most modular power supplies use the same style of designating which lead is positive and which one is negative. Generally, the lead with a white stripe, or white markings, is the positive lead. Verify the lead markings with a meter before connecting a power source to the NET485.

Connect the positive lead to the terminal marked 8-24VDC. Connect the negative lead to the terminal marked GND. See Figure 5 for lead identification. The power LED will come on when power is supplied. See Figure 4 and Figure 6 for the location of the Power LED.

The unit will go through a self-test and will attempt to connect to a server. The LEDs on the Ethernet connector will indicate the connection status. See Ethernet Interface.

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NET485 User Guide

Introduction

2.4 Ethernet Interface

The NET485 device contains the following LEDs:

10BaseT/100BaseTX (Bi-color, Left LED)

Full/Half Duplex (Bi-color, Right LED)

POWER

LEFT

 

 

 

LED

LED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6 - Ethernet Jack

Table 2 - NET485 LED Functions

Left LED

Right LED

Meaning

Solid Amber

 

10BASE-T

Solid Green

 

100BASE-Tx

 

Blinking Amber

Half Duplex Activity

 

Blinking Green

Full Duplex Activity

NET485 User Guide

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Introduction

2.5 Product CD

The CD sent with the NET485 contains Device Installer software and technical manuals to support the NET485. Device Installer allows for fast and easy configuration of the NET485.

1. Insert the CD into your CD-ROM drive. The CD will automatically start and display the main window. If the CD does not launch automatically:

a)Click the Start button on the Task Bar and select Run.

b)Enter your CD drive letter, colon, backslash, Launch.exe (e.g., D:\Launch.exe).

To view the Quick Start Guide, click on Quick Start Guide button.

To view the technical documents, click on NET485 Documentation. The technical manuals are in PDF format. If you do not have Acrobat Reader installed, you can install it from the CD.

To install Device Installer, Java RE, Microsoft .NET Framework, or other software products, click the NET485 Software button. For more information about Device Installer, see Device Installer on page 3-1.

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NET485 User Guide

Introduction

2.6 Additional Documentation

The following guides are available on the product CD. There are several other manuals on the CD, however, they do not apply to the NET485 product.

Title

Description

File Name

NET485 User

This manual in PDF format.

NET485_UM_800240_a.pdf

Guide

 

 

Device Installer

Information about installing and using

Dev_Inst_UG_800233_a.pdf

User Guide

Device Installer Utility.

 

Comm Port

Provides information on using the

Redirector_UG_800235_a.pdf

Redirector Guide

Windows based utility to create a

 

 

virtual com port.

 

Web Enable User

Explains the steps to get your device

Web_Enabling_UG_800236_a.pdf

Guide

Web enabled.

 

GPIO Interface

Introduction to the GPIO interface and

GPIO_800237_a.pdf

Guide

a demo program.

 

UDP Configuration

How to use UDP to configure the unit.

UDPconfig_800238_a.pdf

Guide

How to acquire and use setup records

 

 

to configure a unit.

 

Tech Notes

Additional information to aid in using

485_Notes_800239_a.pdf

 

the NET485.

 

NET485 User Guide

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Introduction

2.7 Technical Specifications

Table 3 - Technical Specs

The transceiver used in the NET485 is intended for balanced data transmission and complies with both EIA Standards RS-485 and RS-422. It contains a differential line driver and a differential line receiver, and is suitable for half-duplex transfer. The input impedance is 19KOhm allowing up to 50 transceivers to be connected on the bus.

Category

Description

CPU

DSTni-EX 186 CPU, 256 KB zero wait state SRAM

 

2048KB Flash, 16KB Boot ROM, 1024KB SRAM

Firmware

Upgradeable via TFTP

Reset Circuit

Reset In is low active. (Software reset only)

Serial Interface

RS422/485. Baudrate software selectable (300 to 921600)

Serial Line Formats

7 or 8 data bits, 1-2 Stop bits, Parity: odd, even, none

Network Interface

RJ45 Ethernet 10Base-T or 100Base-TX (Auto-sensing)

Compatibility

Ethernet: Version 2.0/IEEE 802.3

Protocols Supported

ARP, UDP, TCP, Telnet, ICMP, SNMP, DHCP, BOOTP, TFTP, Auto IP, SMTP, and

 

HTTP

Power Input

8VDC to 24VDC, approximately 200ma.

LEDs

10Base-T & 100Base-TX Activity, Full/half duplex.

Management

Internal web server, SNMP (read only) Serial login, Telnet login

Security

Password protection, Locking features, optional Rijndael 128-bit encryption

Internal Web Server

Serves static web pages and Java applets

Weight

1.7oz

Material

Case: Flame Retardant

Temperature

Operating range: -40°C to +85°C (-40°F to 185°F) High performance mode has an

 

upper temperature limit of 75°C.

Relative Humidity

Operating: 5% to 95% non-condensing

Warranty

1-year limited warranty

Included Software

Windows™ 98/NT/2000/XP based Device Installer configuration software, Windows™

 

based Comm Port Redirector.

EMI Compliance

Radiated & conducted emissions - complies with Class B limits of EN 55022:1998

 

Direct & Indirect ESD - complies with EN55024:1998

 

RF Electromagnetic Field Immunity - complies with EN55024:1998

 

Electrical Fast Transient/Burst Immunity - complies with EN55024:1998

 

Power Frequency Magnetic Field Immunity - complies with EN55024:1998

 

RF Common Mode Conducted Susceptibility - complies with EN55024:1998

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NET485 User Guide

Device Installer

3. Device Installer

3.1.1 Microsoft NET Framework

Microsoft .NET is the Microsoft strategy for connecting systems, information, and devices through Web services so people can collaborate and communicate more effectively. .NET technology is integrated throughout Microsoft products, providing the capability to quickly build, deploy, manage, and use connected, security-enhanced solutions through the use of Web services.

Web services are small, reusable applications that help computers from many different operating system platforms work together by exchanging messages. Web services are based on industry protocols that include XML (Extensible Markup Language), SOAP (Simple Object Access Protocol), and WSDL (Web Services Description Language). These protocols help computers work together across platforms and programming languages.

From a business perspective, Web services are used to reenable information technology so that it can change, move, and adapt like other aspects of a business. They not only connect systems, they can help connect people with the information they need, within the software applications they are used to using, and wherever they happen to be.

Device Installer uses .NET Framework to adapt the NET485 for Web services. Your system must have

.NET Framework installed for Device Installer to work properly. Installation options are included on the software CD.

3.1.2 Install Device Installer

1.Insert the product CD into your CD-ROM drive. The CD will automatically start and display the main window.

If the CD does not launch automatically:

a)Click the Start button on the Task Bar and select Run.

b)Enter your CD drive letter, colon, backslash, Launch.exe (e.g., D:\Launch.exe).

Figure 7 - CD Browser Main Window

NET485 User Guide

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