Black Box LD485A-HS Manual de usuario

CUSTOMER

SUPPORT

INFORMATION

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FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

SEPTEMBER 1999

ME837A-R2 ME837AE

ME837C-R2 ME838A-R2

ME838AE ME838C-R2

BC00702 FA520A-R2

LD485A-HS

LD485A-HS Card

LD485A-HS Opto-Isolated

LD485A-HS Isolated Card

LD485A-HS OPTO-ISOLATED

TX RX CD RTS PWR

NORMAL

DLB

RX TX RTS CD

DCE

DTE

LD485A-HS

TX RX CD RTS PWR

NORMAL

DLB

RX TX RTS CD

DCE

DTE

FCC AND IC STATEMENTS

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio frequency energy

and if not installed and used properly, that is, in strict accordance with the

manufacturer’s instructions, may cause interference to radio communication.

It has been tested and found to comply with the limits for a Class A

computing device in accordance with the specifications in Subpart J of Part 15

of FCC rules, which are designed to provide reasonable protection against

such interference when the equipment is operated in a commercial

environment. Operation of this equipment in a residential area is likely to

cause interference, in which case the user at his own expense will be required

to take whatever measures may be necessary to correct the interference.

Changes or modifications not expressly approved by the party responsible

for compliance could void the user’s authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from

digital apparatus set out in the Radio Interference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites

applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le

brouillage radioélectrique publié par Industrie Canada.

LD485A-HS and LD485A-HS Opto-Isolated

Contents

Chapter Page

1. Specifications...................................................................................................1

2. Introduction ....................................................................................................3

3. Installation.......................................................................................................4

3.1 Jumper and Switch Configuration.........................................................4

3.1.1 DTE/DCE Configuration..........................................................4

3.1.2 Frame Ground/Signal Ground ................................................4

3.1.3 Half/Full-Duplex Operation.....................................................5

3.1.4 CTS Delay...................................................................................7

3.1.5 RS-485 Driver Enable.................................................................7

3.1.6 Half-Duplex Turnaround Delay ...............................................8

3.1.7 RS-485 Interface Terminated or Unterminated ......................8

3.1.8 Normal/Loopback Operation ..................................................9

3.1.9 RS-485 Interface Line Biased (Fail-Safe)..................................9

3.2 DCE Configuration/DTE Configuration............................................10

3.3 Typical Applications .............................................................................18

Appendix A: Pinning ........................................................................................25

CHAPTER 1: Specifications

Optical Isolation: ME838A-R2, ME838AE, ME838C-R2 only

Interface — (1) asynchronous RS-232 port (DTE/DCE selectable);

(1) asynchronous RS-485 port with improved surge protection and

switch-selectable line termination or line bias

Connectors — (1) DB25, female—RS-232 port;

(1) four-wire terminal block (TB1)—RS-485 port

Pins Supported — RS-232 port: TD, RD, RTS, CTS, CD, DTR, DSR, SG,

and FG; RS-485 port: TXA, TXB, RXA, RXB

Data Rate — 0 to 115 Kbps, transparent to data

Indicators — (5) LEDs: TX, RX, RTS, CD, and PWR

Temperature

Operating — 32 to 122° F (0 to 50° C)

Storage — -4 to 158° F (-20 to 70° C)

Humidity — 0 to 95% relative humidity, noncondensing

MTBF — Approximately 180,000 hours (ground benign environment)

Power — PS154 (for use with ME837A-R2, ME838A-R2): Input—120V, 60 Hz,

20W; Output—AC 17VCT, 0.7A; PS154E (for use with ME837AE, ME838AE):

Input—230V, 50 Hz, 20W; Output—AC 17VCT, 750 mA

Size — Standalone Unit: 1.8"H x 5.5"W x 8.5"D (4.6 x 14 x 21.6 cm)

Rackmount Card: 7.4"L x 4.7"W (18.8 x 11.9 cm); 0.6 inches thick (1.6 cm)

Weight — Standalone Unit: 1 lb. (0.5 kg);

Power supply only: PS154—0.4 lb. (0.2 kg), PS154E—1.1 lb. (0.5 kg)

1. Specifications

LD485A-HS and LD485A-HS Opto-Isolated

Operation — Point to Point or Multipoint

Half or Full Duplex

Transparent to data

Selectable RTS-to-CTS delay with option to

inhibit CTS if CD is present (DCE)

DTE or DCE configurable RS-232 port

Normal or loopback operation

Timeout Delay — 0.15, 0.7, 2, 7, or 70 msec (for the RS-485 driver enabled by

data feature)

Typical Speed Versus Distance — (4-wire point-to-point 26-AWG twisted pair)

SPEED DISTANCE

1200 bps 4 miles (6.4 km)

2400 bps 3 miles (4.8 km)

4800 bps 2.3 miles (3.7 km)

9600 bps 1.7 miles (2.7 km)

19,200 bps 1.2 miles (1.9 km)

38,400 bps 0.9 mile (1.4 km)

64,000 bps 0.75 mile (1.2 km)

115 Kbps 0.4 mile (0.6 km)

NOTE: Speed and distances will depend on

actual operating conditions.

CHAPTER 2: Introduction

The LD485A-HS is an RS-232-to-RS-485 interface converter that operates in

the same manner as a modem. It allows an RS-232 device to transmit data over

much longer distances than is normally possible (up to 4 miles—6.4 km—at

1200 bps). The advantage of the LD485A-HS over other line drivers and

modems is that it can also operate in multipoint applications. Depending on

the operating environment, as many as 64 devices can be linked together

using twisted-pair cable.

The opto-isolating models (ME838A-R2, ME838AE, ME838C-R2) protect one

segment of your extended network from problems that arise on the other.

Inside the RS-232↔485/422 Opto-Isolator/Converter, optical isolation

circuitry converts electrical signals to light and back again, to keep signal

noise and ground loops from crossing between segments of your RS-485

installation. That means the electrical noise from your factory floor won’t

affect your office communications, and the difference in ground potential

between buildings won’t damage your sensitive equipment.

Additional features include a manual loopback test to check the system wiring

for both the RS-232 and RS-485 interfaces, and transient protection on the

RS-485 interface to help prevent damage due to voltage transients on the

data line.

Although designed specifically to connect to other LD485A-HS line drivers,

the RS-485 port may be connected to any device with an RS-422 or RS-485

interface. For example, this would be useful in an industrial application where

RS-485 and RS-422 devices would be connected to the same LD485A-HS.

The LD485A-HS is available in standalone and rackmount versions. The

rackmount cards (part numbers ME837C-R2 and ME838C-R2) are designed

to be installed in the multi-function rack (part number RM005).

A 6-ft. DB25 male/DB25 female extension cable and a serial AT adapter

(DB9 female/DB25 male) are included with the ME837A-R2, ME837C-R2,

ME838A-R2, and ME838C-R2.

2. Introduction

LD485A-HS and LD485A-HS Opto-Isolated

This section describes the jumper and switch functions for configuring the

LD485A-HS. See Figure 1 (page 6) for the component locations.

To install your LD485A-HS:

1. Set each of the ten jumpers/switches for your application.

2. Connect the LD485A-HS devices together as shown in Figures 5

through 8 (pages 19–22).

3. Apply power. (PS154 or PS154E, depending on which LD485A-HS you

have. See Chapter 1 for more information.)

3.1 Jumper and Switch Configuration

NOTE

As you read this section, refer to Tables 1 and 2. Table 1 (page 11) lists

DCE jumper settings, and Table 2 (page 16) lists DTE jumper settings.

3.1.1 DTE/DCE C

ONFIGURATION

A DIP shunt is used to select DTE or DCE configuration. For the

LD485A-HS to appear as a DTE device, put the DIP shunt jumper in socket

XW1B. For the LD485A-HS to appear as a DCE device, put the DIP shunt

jumper in socket XW1A.

3. Installation

CHAPTER 3: Installation

3.1.2 F

RAME

ROUND

IGNAL

ROUND

Jumper W7 ties signal ground to frame ground. The position is left open at

the factory. If signal ground is to be connected to frame ground, solder a

100-ohm, 1/2-watt resistor in location W7. A wire jumper may also be used.

Care must be taken to ensure that ground circulating currents are limited

to acceptable levels.

3.1.3 H

ALF

ULL

-D

UPLEX

PERATION

Jumper W8 selects half-duplex or full-duplex operation. Set W8 to the HALF

position for half-duplex operation. Set W8 to the FULL position for full-

duplex operation.

NOTE

When the jumper W9 is in the ON position and jumper W15 is in the A-B

position, the RS-485 driver is always turned on to enable transmission of

data. Therefore, half-duplex transmission cannot be performed. See

Section 3.1.5 for an explanation of the RS-485 driver.

LD485A-HS and LD485A-HS Opto-Isolated

Figure 1. Layout of the Printed Circuit Board.

DS5

DS2

CD/RTS

DS1

RTS/CD

DSR4

DS3

PWR

DELAY

D - 5ms

E - 35ms

W17

W17 DRIVER ENABLE HOLD

A - 70ms

B - 7ms

C - 2ms D - 0.7ms

E - 0.15ms

W19

W15 A-B = RTS/CD ENABLED

B-C = DATA ENABLED

W9 30 mesc

10 mesc

0 mesc

A-B RTS/CTS

B-C RTS/CTS/CD

W5A

W15

ABC

ABCDE

BCDE

AW16

W8 A-B = 2 WIRE

B-C = 4 WIRE W16 TURNAROUND

A = 0ms

B = 0.1ms

C = 1ms

R49/W7

BIASTERM

XW1A

DCE

TB1

XW1B

DTE

W18

ABC

TATBRARB

CHAPTER 3: Installation

3.1.4 CTS D

ELAY

When the transmitter of a device is first turned on, an unstable carrier signal

is transmitted for several milliseconds. If data was sent during this period, it

would be received as distorted information. Setting a CTS delay on the

LD485A-HS allows the communications link to settle down before data can be

sent.

LD485A-HS as DCE

When the LD485A-HS is configured as a DCE device (DIP shunt in position

XW1A), jumper W9 controls the amount of delay from the time RTS (jumper

W5 in the A-B position) is received true until CTS is asserted true. If W5 is in

the B-C position, CTS will be inhibited if an RS-485 carrier is present when

RTS is raised. To select a CTS delay period, set jumper W9 to the 0-, 10-, or

30-msec position. Regardless of the delay setting selected, when RTS goes

false, CTS will immediately go false. If jumper W9 is in the “ON” position,

CTS will follow RTS.

LD485A-HS as DTE

When the LD485A-HS is configured as a DTE device (DIP shunt in position

XW1B), CTS is not supported.

3.1.5 RS-485 D

RIVER

NABLE

The LD485A-HS’s RS-485 driver can be set to be enabled one of three ways: by

RS-232 control signals, by data, or constantly on.

Driver Enabled by RS-232 Control Leads

If your equipment raises CD or RTS, you can set the RS-485 driver to be

enabled by one of these leads. If your equipment does not have the capability

to raise CD or RTS, you will need to set the RS-485 driver to be enabled by

data or constantly enabled.

In order for an RS-232 control lead to enable the RS-485 driver, W15 must be

in position A-B and W9 must be set for 0, 10, or 30 ms.

• When the RS-232 port is selected as DTE (DIP shunt in the XW1B

position), the RS-485 driver will be enabled when CD (pin 8 of the

RS-232 connector) goes true.

• When the RS-232 port is selected as DCE (DIP shunt in the XW1A

position), RTS enables the driver.

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