Black Box 32457 Manuel utilisateur

Share RS-232/V.24 modems,

multiplexors, host or computer ports

between 2 or 8 terminals.

Share RS-232/V.24 modems,

multiplexors, host or computer ports

between 2 or 8 terminals.

Multiport Modem Sharing Devices

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FEATURES

• Share 1 port between 2 or 8 sub-channels.

• No crossover cables are required

between devices, thanks to an internal

DCE/DTE switch for configuring the

master port.

• Operates in sync or async mode.

• Works with dialup or leased-line

modems.

• Diagnostic indicators tell you status

at a glance.

• Cascade units for more than 8 sub-channel

connections.

OVERVIEW

With the Multiport Modem Sharing Devices, two or eight

sub-channels can share one modem or port.

You can configure the master port for use with a modem,

multiplexor, or computer port via an internal DCE/DTE switch,

eliminating the need for crossover cables between devices.

The Modem Sharing Device is sure to fit your application,

since it operates in either sync or async mode. In sync mode,

timing is derived from either the master port, sub-channel

one, or internally. For more information about timing, see the

Technically Speaking section.

And because the Data Terminal Ready (DTR) control signals

from the terminal are passed through, you can use the

Sharing Device with dialup or leased-line modems.

Front-panel LEDs indicate active sub-channel, power, and

data activity.

Here’s how it works: all sub-channels contend for the

master port by raising the Request to Send (RTS) signal. The

device sends the Clear to Send (CTS) signal back to the sub-

channel when it’s connected to the master port. All other

ports are locked out until the contending port lowers the RTS

signal.

You can configure the Sharing Device to broadcast to all

terminals or only to the contending terminal. In broadcast

mode, all ports can receive data from the master port at the

same time, which is ideal in polled applications.

To connect more than eight sub-channels to one modem

or port, simply cascade Multiport Modem Sharing Devices.

TYPICAL APPLICATIONS

• Share a dialup or leased-line modem between two

controllers.

• Share a multiplexor or computer port among up to eight

terminals or controllers.

TECH SPECS

Line Type — Point-to-point or multipoint

Operation — Half- or full-duplex

Speed — Async: Up to 64 kbps;

Sync: Internal up to 38.4 kbps, external up to 64 kbps

Interface — Subchannels: RS-232 (DCE);

Master Port: RS-232 (DTE/DCE)

Connectors — 33821: (3) DB25 female;

32457: (9) DB25 female

Indicators — Power, Transmit, Receive, and Ports 1–2 or Ports 1–8

Power — 115 VAC, 60 Hz

Size — 33821: 1.7"H x 10"W x 6.5"D (4.3 x 25.4 x 16.5 cm);

32457: 1.9"H x 12.8"W x 9.5"D (4.8 x 32.5 x 24.1 cm)

Weight — 33821: 3 lb. (1.4 kg);

32457: 3.8 lb. (1.7 kg)

The Multiport Modem Sharing Device operates

automatically.

• It automatically switches between RS-232/V.24 interface

ports by monitoring the Request to Send leads from the

terminals it’s connected to.

• The Device derives timing (clocking) for synchronous data

from one of three sources:

1. External from the device connected to the master port,

2. Internal up to 38.4 kbps, or

3. External sub-channel 1 via pin 24 from the connecting

terminal.

Technically Speaking

Item Code

Multiport Modem Sharing Devices

2-Port 33821

8-Port 32457

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