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Modular Current Loop Adapter
CUSTOMER
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 724-746-0746
SUPPORT
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
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JANUARY 1998
CL512A-F
CL512A-M
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Related Manuals for Black Box CL512A-F
Summary of Contents for Black Box CL512A-F
- Page 1 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 724-746-0746 SUPPORT Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
- Page 2 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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Page 3: Table Of Contents
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... -
Page 4: Specifications
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);... -
Page 5: Description
MODULAR CURRENT LOOP ADAPTER 2. Description The Modular Current Loop Adapter connects current-loop equipment such as industrial controllers and Data General computers to RS-232 equipment such as modems, multiplexors, computers and terminals. The unit is a “passive” device: this means it does not provide current for the current loop. The “passive” adapter must connect to an “active”... -
Page 6: Configuration And Installation
MODULAR CURRENT LOOP ADAPTER 3. Configuration and Installation 3.1 RS-232 Interface 3.1.1 DCE DTE C ONFIGURATION The adapter connects easily to an RS-232 device such as a DTE (terminal, computer) or DCE (modem, line driver, multiplexor). The attached RS-232 device supplies power to the adapter via a positive (+12) voltage on the adapter’s pin 20 (if the unit is configured as DCE) or pin 6 (if the unit is configured as DTE). -
Page 7: Current-Loop Interface
MODULAR CURRENT LOOP ADAPTER 3.2 Current-Loop Interface Review the following pinning guidelines before you connect the twisted-pair cable from your current-loop device to the adapter’s RJ-11 port or four-position screw terminal. Figure 3-1 shows the pin positions for both connectors. 1 2 3 4 1 2 3 4 Figure 3-1. -
Page 8: Full-Duplex Operation
MODULAR CURRENT LOOP ADAPTER 3.2.1 F UPLEX PERATION Table 3-1. Pinouts for Full-Duplex Current-Loop Connections RJ-11 Modular Pinnings: 1 = RX+, connect to the TX+ of your device. 2 = TX-, connect to the RX- of your device. 3 = TX+, connect to the RX+of your device. 4 = RX-, connect to the TX- of your device. - Page 9 MODULAR CURRENT LOOP ADAPTER FULL-DUPLEX (4-WIRE) CL512 DCE DTE MODEM (DCE) ASYNC COMPUTER (ACTIVE CURRENT LOOP DEVICE) Figure 3-2. Full-Duplex DTE Operation. FULL-DUPLEX (4-WIRE) CL512 DCE DTE COMPUTER ASYNC COMPUTER (DTE) (ACTIVE CURRENT LOOP DEVICE) Figure 3-3. Full-Duplex DCE Operation.
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Page 10: Half-Duplex Operation
MODULAR CURRENT LOOP ADAPTER 3.2.2 H UPLEX PERATION Table 3-2. Pinouts for Half-Duplex Current-Loop Connections RJ-11 Modular Pinnings* 3 = + Loop Jumper 1 to 2 4 = - Loop Terminal Block Pinnings 1 = + Loop Jumper 2 to 3 4 = - Loop *Half-duplex operation is not recommended for RJ-11 connections due to the difficulty involved in crossing Jumpers 2 and 3. -
Page 11: Connecting The Current-Loop Device
MODULAR CURRENT LOOP ADAPTER HALF-DUPLEX (2-WIRE) CL512 DCE DTE MODEM (DCE) ASYNC COMPUTER (ACTIVE CURRENT LOOP DEVICE) Figure 3-4. Half-Duplex DTE Operation. HALF-DUPLEX (2-WIRE) CL512 DCE DTE COMPUTER ASYNC COMPUTER (DTE) (ACTIVE CURRENT LOOP DEVICE) Figure 3-5. Half-Duplex DCE Operation. 3.2.3 C ONNECTING THE URRENT... - Page 12 © Copyright 1998. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...