Black Box CL512A-F, CL512A-M User Manual

JANUARY 1998

CL512A-F

CL512A-M

Modular Current Loop Adapter

TX+
TX­RX+
RX-

1

3

2

4

3

2

232 TO CL

CL TO 232

DTE

DTE

DCE

DTE

DCE

DCE

CL512

CUSTOMER

SUPPORT

INFORMATION

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [e-mail]

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MODULAR CURRENT LOOP ADAPTER

TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are acknowledged to be the property of
the trademark owners.

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MODULAR CURRENT LOOP ADAPTER

Contents

Chapter Page

1. Specifications ..........................................................................................................4

2. Description..............................................................................................................5

3. Configuration and Installation ..............................................................................6

3.1 RS-232 Interface............................................................................................6

3.1.1 DCE or DTE Configuration ............................................................6

3.1.2 Connecting the RS-232 Device ........................................................6

3.2 Current-Loop Interface................................................................................7

3.2.1 Full-Duplex Operation ....................................................................8

3.2.2 Half-Duplex Operation..................................................................10

3.2.3 Connecting the Current-Loop Device ..........................................11

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MODULAR CURRENT LOOP ADAPTER

Speed — Up to 19.2 Kbps

Maximum Distance — 1000 ft. (304.8 m)

Operation — Passive, 20-mA current loop, unipolar, mark=current,

space=no current

Interface — RS-232/V.24, DCE or DTE (switch-selectable), 20-mA

current loop

Connectors — RS-232: (1) DB25 male for CL512A-M, (1) DB25 female

for CL512A-F; Current Loop: (1) four-position screw
terminal strip and (1) RJ-11 (4-wire)

Enclosure — Metal

Power — +12 volts must be provided by EIA Interface (Pin 6

when unit is configured as a DTE, Pin 20 when
configured as a DCE); current provided by external
“active” device (20 mA, 24 VDC max.), optically isolated
for RS-232 signal protection

Size — 0.9" H x 2.1" W x 3" D (2.3 x 5.3 x 7.6 cm)

Weight — 2.1 oz. (59.5 g)

1. Specifications