Black Box CL512A-F Manuale utente
JANUARY 1998
CL512A-F
CL512A-M
Modular Current Loop Adapter
TX+
TX-
RX+
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 724-746-0746
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
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.
3
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
4
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
5
MODULAR CURRENT LOOP ADAPTER
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” current-loop device. The “active” device provides the
20-mA current for the loop. (There can be only one active device in the current
loop.) The RS-232 interface of the attached equipment must provide a +12 voltage
on either pin 6 or pin 20 to power the adapter.
2. Description
6
MODULAR CURRENT LOOP ADAPTER
3.1 RS-232 Interface
3.1.1 DCE
OR
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). Pinnings for both configurations are shown below.
DTE DCE
Pin 2 = TD (output) Pin 2 = TD (input)
Pin 3 = RD (input) Pin 3 = RD (output)
Pin 6 = DSR (input) Pin 20 = DTR (input)
Pin 7 = Signal Ground Pin 7 = Signal Ground
To configure the adapter, simply move the external switch to the DTE or DCE
position. If you are going to plug the adapter into a DTE, move the adapter switch
to the DCE position. If you are going to plug the adapter into a DCE, move the
adapter switch to the DTE position.
3.1.2 C
ONNECTING THE
RS-232 D
EVICE
To connect the adapter to the RS-232 device, simply plug the unit’s DB25
connector into your RS-232 equipment’s DB25 connector. (The unit is available in
both male and female versions to accommodate your equipment.)
3. Configuration and Installation
7
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.
Figure 3-1. Pin Positions for RJ-11 and Terminal Screw Block.
Connections on the current-loop side of the adapter may be full- or half-duplex. In
full-duplex transmission, both the adapter and the current-loop device may send
and receive data simultaneously. In half-duplex transmission, only one device at a
time may send or receive data. Section 3.2.1 describes full-duplex connections and
Section 3.2.2 discusses half-duplex connections.
1234
1 2 3 4
RX-TX+TX-RX+ RX-RX+TX-TX+
8
MODULAR CURRENT LOOP ADAPTER
3.2.1 F
ULL
-D
UPLEX
O
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.
Terminal Block Pinnings:
1 = TX+, connect to the RX+ of your device.
2 = TX-, connect to the RX- of your device.
3 = RX+, connect to the TX+ of your device.
4 = RX-, connect to the TX- of your device.
Typical full-duplex applications for the adapter are shown in Figures 3-2 and 3-3. In
Figure 3-2, the unit is connected to a DTE device. In Figure 3-3, the unit is
connected to a DCE device.
NOTE
When connected to a DTE device, the adapter does not output pins 5
(CTS), 6 (DSR), or 8 (CD). If your computer (DTE) needs these pins
before it can send data, you must use a short cable with the proper pin
configuration between the computer and the unit. This entails looping
pin 4 (RTS) or any other signal at 12 volts to pins 5, 6, and 8 on the side
connected to the computer.
When connected to a DCE device, the adapter does not output pins 4
(RTS) or 20 (DTR), which your modem may need before it can send data.
If your modem needs these pins, you must use a short cable with the
proper pin configuration between the modem and the unit. This involves
looping pin 8 (CD) or any other signal on the interface that is at +12 V to
pins 4 and 20 on the side connected to the modem.
9
MODULAR CURRENT LOOP ADAPTER
Figure 3-2. Full-Duplex DTE Operation.
Figure 3-3. Full-Duplex DCE Operation.
FULL-DUPLEX (4-WIRE)
2
3
7
20
1
2
3
4
TX+
TX-
RX+
RX-
RX+
RX-
TX+
TX-
CL512
DCE DTE
COMPUTER
(DTE)
ASYNC COMPUTER
(ACTIVE CURRENT LOOP DEVICE)
FULL-DUPLEX (4-WIRE)
2
3
6
7
1
2
3
4
TX+
TX-
RX+
RX-
RX+
RX-
TX+
TX-
CL512
DCE DTE
MODEM
(DCE)
ASYNC COMPUTER
(ACTIVE CURRENT LOOP DEVICE)
10
MODULAR CURRENT LOOP ADAPTER
3.2.2 H
ALF
-D
UPLEX
O
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.
Typical half-duplex applications for the adapter are shown in Figures 3-4 and 3-5.
In Figure 3-4, the unit is connected to a DTE device. In Figure 3-5, the unit is
connected to a DCE device.
NOTE
When connected to a DTE device, the adapter does not output pins 5
(CTS), 6 (DSR), or 8 (CD). If your computer needs these pins before it
can send data, you must use a short cable with the proper pin
configuration between the computer and the unit. This entails looping
pin 4 (RTS) or any other signal at +12 volts to pins 5, 6, and 8 on the side
connected to the computer.
When connected to a DCE device, the adapter does not output pins 4
(RTS) or 20 (DTR). If your modem needs these pins before it can send
data, you must use a short cable with the proper pin configuration
between the modem and the unit. This involves looping pin 8 (CD) or
any other signal on the interface that is at +12V to pins 4 and 20 on the
side connected to the modem.
Questo manuale è adatto per i seguenti modelli
1
Indice
Altri manuali Black Box Adattatore
Black Box
Black Box 2-Port RS-232/422/485 Manuale utente
Black Box
Black Box LE1351C Manuale utente
Black Box
Black Box LE1351C Manuale utente
Black Box
Black Box TCA-232 Manuale utente
Black Box
Black Box AC346A USB to HD Pro Manuale utente
Black Box
Black Box IC114A-R2 Manuale utente
Black Box
Black Box IC250C Manuale utente
Black Box
Black Box IC262A Manuale utente
Black Box
Black Box IC441A Manuale utente
Black Box
Black Box LE071A Manuale utente
Black Box
Black Box LE073A-R2 Manuale utente
Black Box
Black Box IC102C-R2 Manuale utente
Black Box
Black Box IS280A-R2 Manuale utente
Black Box
Black Box IC138A-R2 Manuale utente
Black Box
Black Box IC126C Manuale utente
Black Box
Black Box LE1351C Manuale utente
Black Box
Black Box VOE101 Manuale utente
Black Box
Black Box LBU9001-US Manuale utente
Black Box
Black Box IS425A Manuale utente
Black Box
Black Box USB Director II Manuale utente
