Black Box ME540A-ST Bedienungsanleitung

Connect your RS-232, RS-485, or 20-mA

Current Loop device to fiber optic cable.

Connect your RS-232, RS-485, or 20-mA

Current Loop device to fiber optic cable.

Fiber Optic Multipoint (FOM) Line Drivers

FREE 24-hour Tech Support: 724-746-5500

blackbox.com

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FEATURES

• Configure the line driver in network

or master/slave mode.

• Operate in half- or full duplex mode.

• Select from RS-232, RS-485, or 20-mA

Current Loop.

• Runs at 128 kbps at distances up to

6000 feet (1828.8 m).

• ST connectors.

Use the Fiber Optic Multipoint Line Driver in an industrial environment.

OVERVIEW

With the Fiber Optic Multipoint Line Driver, you can use an

RS-232, RS-485, or 20-mA Current Loop device in a multidrop

half-duplex environment with fiber optics as the transmission

media.

The line driver has a single RS-232 DB9 female connector.

TX and RX are parallel with a 20-mA Current Loop and an

RS-485 interface sharing a common terminal block with a

switch to select the shared interface. This enables you to

connect an RS-232, an RS-485, or a Current Loop device to a

fiber optic link. In addition, there are two fiber optic receivers

and transmitters with ST®connectors supporting standard

fiber cable through 200 microns.

The line driver runs at 128 kbps at distances up to

6000 feet (1828.8 m).

You can configure the device in one of two operating

modes: network mode or master/slave mode.

In network mode, data sent to the transmitter of the

RS-232 DB9, 20-mA Current Loop, or RS-485 terminal block

is passed out to both optical transmitters. Data received

from either optical receiver is passed through to the opposite

optical port’s transmitter, to the receiver of the RS-232 DB9,

20-mA Current Loop, or RS-485 port.

In master/slave mode, one unit is configured as a master,

and all others as slaves. When the master sends data to the

transmitter of the RS-232 DB9, 20-mA Current Loop, or RS-485

terminal block, it is passed through to the master B optical

port. From there, it is daisychained to the next slave’s A

optical RX. As each slave receives the data, it is passed

through to the DB9 RX and the receive terminal block.

In addition, the data is retransmitted out that slave’s B

optical TX to the next slave.

The line driver can also run in full-duplex mode when

both units are configured as masters.

TYPICAL APPLICATIONS

The line driver is ideal for industrial environments.

Configure two units as masters to run them in a point-to-

point configuration. Or, link three units in a multipoint

configuration (see the diagram above).

Fiber Optic Multipoint

Line Driver (ME540A-ST)

Fiber Optic Multipoint

Line Driver (ME540A-ST)

Fiber Optic Multipoint

Line Driver (ME540A-ST)

Conveyor belt

Premium Ceramic,

Multimode 62.5-Micron

Fiber Optic Patch Cable

(EFN110)

Premium Ceramic,

Multimode 62.5-Micron Fiber

Optic Patch Cable (EFN110)

PC (comm port) Time clock

The Fiber Optic Multipoint Line Driver is factory-configured

as follows. You can change these settings to suit your

application.

•XW2 can be set for RS-232, RS-485, or 20-mA Current Loop

operation. The factory default is RS-232.

•S1 positions 1 and 2 can be set to determine the mode the

unit will operate in. Choose from Network mode or

Master/Slave mode. Master is the default.

•S1 positions 3–6 can be set for fail-safe/biased line.

•S1 positions 7–8 can be set for RS-485 termination or no

termination.

•W2 sets the delay of CTS assertion with the raising of DTR

or RTS. The default setting is 0, no delay.

Technically Speaking

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TECH SPECS

Cable Requirements — Use multimode fiber cable up to 200-micron;

62.5-micron fiber is recommended

Distance (Maximum) — 5000 feet (1524 m)

Drops Supported — 64

Fiber Launch Power — -14 dB

Link Budget — 50–125 µ cable: 2.5 dB;

62.5–125 µ cable: 6 dB;

100–140 µ cable: 11.5 dB

MTBF — 168,000 hours

Operation — Network mode or Master/Slave mode, multipoint half-

duplex; Point-to-point line driver operation, full duplex

Protocol — Asynchronous

Receiver Sensitivity — -25 dB

Speed — Transparent through 20 kbps on 20-mA Current Loop port,

64 kbps on RS-232 port, 128 kbps on RS-485 port;

(2) jumpers: XW2, W2; (1) 8-position DIP switch: S1

User Controls — (1) Push button: Pressed in enables DLB (Digital

Loopback) mode, and fully extended enables NORMAL mode

Interface — RS-232 DCE/DTE, RS-485, 20-mA Current Loop—active or

passive transmit and receive, fiber optic transmit and receive

Connectors — (1) DB9 F, (2) pairs of ST, (1) 4-screw terminal block

Indicators — (10) LEDs: 232, 485, 20 mA, NETWORK, MASTER, SLAVE,

PORT B TXD, PORT B RXD, PORT A TXD, PORT A RXD

Temperature — Operating: 32 to 114°F (0 to 45°C);

Storage: -40 to +176°F (-40 to +80°C)

Power — 115 VAC or 230 VAC, 60/50 Hz (external)

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

Weight — 2 lb. (0.9 kg)

Item Code

Fiber Optic Multipoint (FOM) Line Drivers

115-VAC ME540A-ST

230-VAC ME540AE-ST

Recognize any of these situations?

• You wait more than 30 minutes to get through

to a vendor’s tech support.

• The so-called “tech” can’t help you or gives you

the wrong answer.

• You don’t have a purchase order number and the

tech refuses to help you.

• It’s 9 p. m. and you need help, but your vendor’s

tech support line is closed.

According to a survey by Data Communications

magazine, 90% of network managers surveyed say

that getting the technical support they need is extremely

important when choosing a vendor. But even though

network managers pay anywhere from 10 to 20% of their

overall purchase price for a basic service and support

contract, the technical support and service they receive

falls far short of their expectations—and certainly isn’t

worth what they paid.

At Black Box, we guarantee the best value and the

best support. You can even consult our Technical Support

Experts before you buy if you need help selecting just

the right component for your application.

Don’t waste time and money—call Black Box today.

Why Buy From Black Box?

Exceptional Value. Exceptional

Tech Support. Period.

ME540A-ST

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