B&B Electronics ADAM-4521 User Manual

S E R I A L C O M M U N I C A T I O N I N T E R F A C E F O R I N D U S T R I A L A U T O M A T I O N

ADAM-4521

Addressable RS-485 to RS-23 2 Converter with 1000 VDC

Isolation

Introduction

ADAM-4521 is an intelligent RS-485 to RS-232 converter specifically designed to connect RS-232 devices to an RS-485 network with other RS-485 devices. RS-232 is the most common transmission standard. Although widely available on most computer systems, measurement equipment, PLCs, and industrial devices, its transmission speed, communication distance, and especially networking capability are limited due to unbalanced transmission. The ADAM-4521 addressable converter solves this problem and lets you easily build up an RS-485 network with your RS-232 devices by assigning each one an address for easier communication.

Built-in Intelligence

ADAM-4521 is equipped with a built-in microprocessor, which uses two UAR Ts and automatically processes data before transmitting it to the RS-232 device. This makes ADAM-4521 able to allow different baud rates between RS-232 devices and the RS-485 network. The microprocessor also verifies whether the data is transmitted with the appropriate address, which enables each device on the RS-485 network to communicate with your PC over long distances.

RS-485 Network with Automatic Data Flow Control

The RS-485 standard supports half-duplex communication, meaning a single pair of wires is used to both transmit and receive data. Handshaking signals such as RTS (Request To Send) are normally used to control the direction of the data flow, but a special I/O circuit in the ADAM-4521 automatically senses the direction of the data flow and switches the transmission direction. No handshaking signals are necessary.

Features

• Built-in microprocessor

• Transmission speeds of up to 115.2 kbps

• 1000 V

• Surge protection on RS-485 line

• RS-232 and RS-485 can be set to different baud rates

• Automatic RS-485 data flow control

• Watchdog timer function included

• Power and data flow indicator for troubleshooting

• Reserved space for termination resistor

• Software configurable to either addressable or non addressable mode

• Easily mounted on DIN rail, panel or piggyback

• All communication setups stored in EEPROM

isolation

Specifications

• Transmission speed (bps): 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K, 57.6K, 115.2K (software configurable)

Power requirement: Unregulated +10 to +30 V

• with protection from power reversals

Case: ABS with captive mounting hardware

• Accessories (included): Nylon DIN-rail mounting

• adapter, SECC panel mounting bracket

RS-232 interface connector: Female DB-9

•

RS-422/RS-485 interface connector: plug-in screw terminal (accepts AWG 1-#12 or 2-#14~#22 (0.5 to 2.5mm

Operating temperature: -10 to 70°C

• Dimension: 2.36" x 4.41" (60mm x 120mm)

•

Power consumption: 1 W

) wires)

ADAM and the ADAM logo are trademarks of Advantech.

Part No. 2003452100 3nd Edition Printed in Taiwan Aug. 2007

(G)

Installation

Power Supply

Initial

Inspection

We carefully inspect the ADAM-4521 both m echanic cally and electrically before w e ship it. It shou ld be free of marks and scratches and in perfec t ord er on receipt.

As you unpack the module, check it for si gns of shipping damage (damaged box, scratc hes, de nts, etc.). If it is damaged or fai ls to meet o ur spe cifica tions, notify our service departmen t o r you r local sale representative immediately. Al so, ca ll the carr ier immediately and retain the ship ping c arton a nd packing material for inspectio n by t he carrie r. We will then make arrangements to repair o r repl ace th e unit .

Before you begin installation, please make su re you have the following items:

□

1 ADAM-4521 module

□

1 Bracket

□

1 Utility disk

Basic

Configuration

Before installing the ADAM-4521 in an existing network, it should be configured. Though all modules are initially configured at the factory, it is recommended that you check the baud rate settings.

Factory Default Settings:

Protocol: RS-485 Buad Rate: 9600 bps Delimiter: {

Addressable

Mode: Add cr: Yes Address: 01

For the ease of use in industrial environments the

DAM modules are designed to accept industry standard +24 V guaranteed when using any power supply between +10 and +30 V peak to peak while the voltage in all cases must be maintained between +10 and +30 V supply specifications are referenced at module connector.

The power cables should be selected according to the number of modules connected and the length of the power lines. When using a network with long cables, we advise the use of thicker wire to limit the line voltage drop. In addition to serious voltage drops, long voltage lines can also cause interference with communication wires.

We advise that the following standard colors (as indicated on the modules) be used for power lines:

+Vs

(R) Red

GND (B) Black

Communication Wiring

We recommend that shielded-twisted- pair cable s that comply with the EIA RS-485 standard be use d with the ADAM network to reduce interfere nce. On ly one set of twisted-pair cables is required to transmit both Data and RTS signals. We advise that the f ollow ing standard colors (as indicated on the modules ) be used for the communication lines:

DATA + DATA -

unregulated power. Operation is

. Power ripples must be limited to 5V

. All power

(Y)

Yello w Green

ADAM-4521 User's

Manual

Software Configuration

The ADAM-4521 comes with a utility disk containing software with the following capabilities:

• Baud rate configuration

• Address configuration

• Addressable or non-addressable mode selection

• RS-485 or RS-422 mode

NOTE: Before configuring the ADAM-

The main screen consists of a menu bar at the top and a status field which displays information about the connected modules. When you first start the program, it will automatically scan for any connected modules and display their data. The status field lists module characteristics and configuration parameters.

4521, make host RS-485

Figure 1 Main Screen

NOTE: An asterix sign “*” after the

sure

through an RS-422 or

line.

module's address indicates that the module is in the INIT* state.

COMport

To configure your communication port, press COMport icon. A menu will appear allowing you to change which port you are using, the baud rate, and the timeout.

To scan the network for connected devices, click the right button on the COM port to search the existed com port. A window will appear and prompt you for a value from 0 to 255. It will then scan all the addresses from 0 to that number.

selection

it is connected to your

Setup

When you enter the setup screen, look at the below frame of screen. You can see the RS-232 setting and the RS-485 setting. Please check the setting of the interface. You can choose a proper item to fit your owned setting. After you finish the setting, please remember to press the Apply button on the right side.

Figure 2 Setup Options

To change the basic settings, select the item the

1. press <Enter>. Choose the parameter you wish to change, and press <Enter>. A small popup windo will appear with the configuration options for that parameter. Choose the proper value, and press <Enter>.

To change the RS-232/RS-485(RS-422) baud rate

2. settings, select RS-232 Frame or RS-422/485 Frame and press <Enter>. Choose the parameter you wish to change and press <Enter>. A window will appear with the configuration options for that parameter. Choose the proper value and press <Enter>. In addition, you can assign the module with proper ID via the Identification option.

The Mode (addressable or non-addressable) and

3. Baud Rate options need special attention because they can only be changed when ADAM-4521 is in the INIT* state. To alter the Mode and Baud Rate, do the following:

• Power all components on except ADAM-4521.

• Power ADAM-4521 on while shorting the INIT*

and GND terminals.

• Configure the Mode and/or Baud Rate.

• Power ADAM-4521 off.

• Remove the grounding of the INIT* terminal,

and power ADA M-4521 on.

• Check the settings.

INIT* state default settings:

Baud Rate: Protocol: Address:

9600 RS-485 00h

bps

ADAM-4521 User's

Manual

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