Black Box CL090A-F User manual

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INFORMATION
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Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
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FEBRUARY 1996
CL090A-F CL090AE-F
CL090A-M CL090AE-M
CL091A-F CL091AE-F
CL091A-M CL091AE-M
CL092A-F CL092AE-F
CL092A-M CL092AE-M
HS RS-232↔Current Loop
Converter Active
HS RS232↔Current
Loop Converter -
Active
TD
RD
PWR
+

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
FEDERAL COMMUNICATIONS COMMISSION
AND
CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy and
if not installed and used properly, that is, in strict accordance with the
manufacturer’s instructions, may cause interference to radio communication.
It has been tested and found to comply with the limits for a Class A
computing device in accordance with the specifications in Subpart J of Part 15
of FCC rules, which are designed to provide reasonable protection against
such interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is likely to
cause interference, in which case the user at his own expense will be required
to take whatever measures may be necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from
digital apparatus set out in the Radio Interference Regulation of the Canadian
Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par le ministère des Communications du Canada.
TRADEMARKS USED IN THIS MANUAL
AT&T is a registered trademark of American Telephone and Telegraph
Company.
Any other trademarks mentioned in this manual are acknowledged to be the
property of the trademark owners.

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes
de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo,
cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca,
etc..
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El parato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más
allá a lo descrito en las instrucciones de operación. Todo otro servicio
deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama,
sofá, alfombra o superficie similar puede bloquea la ventilación, no se
debe colocar en libreros o gabinetes que impidan el flujo de aire por los
orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de
calor como radiadores, registros de calor, estufas u otros aparatos
(incluyendo amplificadores) que producen calor.

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo
del tipo descrito en el instructivo de operación, o como se indique en el
aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la
polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen
del aparato.
14. El equio eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las
lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no
sea usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del
aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
Contents
1. Specifications.....................................................................................................5
2. Introduction ......................................................................................................6
2.1 Overview......................................................................................................6
2.2 Features.......................................................................................................6
3. Configuration....................................................................................................7
3.1 Setting the DCE/DTE Switch ....................................................................7
3.2 Setting the Active/Passive Switch ..............................................................8
4. Installation.......................................................................................................10
4.1 Twisted-Pair Wiring ..................................................................................10
4.1.1 Twisted-Pair Connection Using Terminal Blocks ........................10
4.1.2 Twisted-Pair Connection Using Modular Jacks ............................15
4.2 Completing the Installation.....................................................................16
Appendix A. RS-232C Pin Connections............................................................17
Appendix B. Block Diagram..............................................................................18

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
2.1 Overview
The HS RS-232↔Current Loop Converter Active lets an asynchronous RS-232
device communicate with a passive 20-mA current-loop device. Equipped with
an external power supply, the Converter supports data rates up to 115.2 Kbps.
The HS RS-232↔Current Loop Converter Active transmitter is active and
must be connected to a passive receiver, and the HS RS-232↔Current Loop
Converter Active receiver can accommodate either a passive or active
transmitter.
Operating at full duplex, the HS RS-232↔Current Loop Converter Active
supports communication distances up to 4 miles (6.4 km) over two
unconditioned 24-AWG twisted pairs. To guard against data loss due to
ground loops, the Converter is equipped with 1500V RMS optical isolators on
the line side.
The HS RS-232↔Current Loop Converter Active connects directly to the RS-
232 interface using a male or female DB25 connector. An external DCE/ DTE
switch eliminates the need for a crossover cable on the RS-232 interface.
2.2 Features
•Full-duplex, asynchronous transmission over 4 wires.
•Data rates up to 115.2 Kbps.
•Optically isolated.
•Twisted-pair connection via terminal blocks, RJ-11, or RJ-45 jacks.
•External DCE/DTE switch.
•Receiver operates actively or passively; transmitter is active only.
•LEDs monitor transmit data, receive data, and power.
•DB25 male or female connectors on RS-232 side.
•Range to 4 miles (6.4 km) on 24-AWG twisted pair.
2. Introduction

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
The HS RS-232↔Current Loop Converter Active is easy to use. The only
configuration necessary for operation is the proper setting of two switches:
the external DCE/DTE switch and the internal active/passive switch.
3.1 Setting the DCE/DTE Switch
The figure below shows the location of the DCE/DTE switch on the PC
board, as well as the location of the terminal block.
RCV G XMT
3. Configuration
Active/passive switch
Terminal Block
DCE/DTE Switch
AC Adapter
RCV
PWR
TX

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
For your convenience, the Converter has an externally accessible DCE/DTE
switch (see the diagram below). If the RS-232 device connected to the
Converter is a modem or multiplexor (or is wired like DCE), set the switch to
“DTE.” The setting causes the Converter to behave like Data Terminal
Equipment, transmitting data on RS-232 pin 2 and receiving data on pin 3.
If the RS-232 device connected to the Converter is a PC, terminal, or host
computer (or is wired like DTE), set the switch to “DCE.” This setting causes
the Converter to behave like Data Communications Equipment, transmitting
data on RS-232 pin 3 and receiving data on pin 2. Remember, the switch
setting is always from the point of view of the HS RS-232↔ Current Loop
Converter Active, not the connected equipment.
3.2 Setting the Active/Passive Switch
The active/passive switch is used to control the mode of the receiver; it has no
control over the transmitter since the transmitter is fixed in the active mode.
To configure your HS RS-232↔Current Loop Converter Active receiver, you
first need to determine whether your device will be active or passive. If you are
going to use the HS RS-232↔Current Loop Converter Active receiver to
provide current for the loop, set the switch to the “active” position. If the HS
RS-232↔Current Loop Converter Active is to be used in an active loop, set
the HS RS-232↔Current Loop Converter Active receiver’s active/passive
switch to passive.
DCE DTE

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
CAUTION
Never connect two active devices together. Your configuration
must be “active to passive” or “passive to active.”
Passive
Active
Active/Passive
Switch

10
HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
The HS RS-232↔Current Loop Converter Active is simple to install. After
configuring the DCE/DTE and active/passive switches, connect the two
twisted pairs using one of three methods: terminal blocks with strain relief, RJ-
11 jack, or RJ-45 jack. The method you use will depend on the specific model
you have. (See Chapter 1 if you aren’t sure which method you should use.)
4.1 Twisted-Pair Wiring
Only one HS RS-232↔Current Loop Converter Active is needed for each RS-
232 to 20-mA current-loop circuit. The HS RS-232↔Current Loop Converter
Active is connected to the current-loop device using two twisted pairs. The
pairs must be “dry” (unconditioned) metallic wire, 19 to 26 AWG. Best
distance is achieved with smaller gauges (that is, thicker wires). When you
have completed wiring for your data circuit, the pin connections should be as
shown below:
4.1.1 T WISTED -P AIR C ONNECTION U SING T ERMINAL B LOCKS
The terminal block/strain-relief version of the HS RS-232↔Current Loop
Converter Active (CL090A-F, CL090A-M, CL090AE-F, CL090AE-M) allows you
to hook up the line-side interface using bare wires. The following instructions
will tell you how to open the case, connect the bare wires, and fasten the
strain-relief collar in place.
XMT+
XMT-
G
RCV-
RCV+
- - - - - - - - -
G
RCV-
- - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - RCV+
To Shield (Optional)
- - - - - - - - - - - - - - - - - - - - XMT-
- - - - - - - - - - - - - - - - - - - - XMT+
One Pair
One Pair
G
4. Installation

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
1. Open the unit by gently inserting a screwdriver between the DB25
connector and the lip of the plastic case (see the diagram below). You don’t
have to worry about breaking the plastic, but be careful not to bend the D-sub
connector.
Once the unit has been opened, you will be able to see the terminal blocks
located at the rear of the PC board.

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
2. Strip the outer insulation from the twisted pairs about one inch from the
end.
3. Strip back the insulation on each of the two twisted-pair wires about one
quarter of an inch.
4. Connect one pair of wires in the telephone cable to XMT (Transmit) on the
terminal block, being careful to observe the polarity. (The wire connected to
XMT+ must be connected at the other end of the telephone line to RCV+ in
the other unit. The wire connected to XMT- must be connected at the other
end of the telephone line to RCV- in the other unit.)
5. Connect the other pair of wires in the telephone cable to RCV (Receive),
again being careful to observe the polarity. (The wire connected to RCV+
must be connected at the other end of the telephone line to XMT+ in the
other unit. The wire connected to RCV- must be connected at the other end
of the telephone line to XMT- in the other unit.)
6. If there is a shield around the telephone cable, it may be connected to “G”
on the terminal block. To avoid ground loops, we recommend connecting the
shield at the computer end only. A ground wire is not necessary for proper
operation of these units.

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
7. When you finish connecting the wires to the terminal block, the assembly
should resemble the diagram below.
8. Place the two halves of the strain-relief assembly on either side of the
telephone wire and press together very lightly. Slide the assembly so that it is
about two inches (5.1 cm) from the terminal posts and press together firmly.
If your cable diameter is too small or too large for our strain relief, contact
your supplier for technical support.
9. Insert the strain-relief assembly with the wire going through it into the slot
in the bottom half of the converter case and set it into the recess in the case.
If the telephone wire does not fit, contact your supplier for technical support.
RCV G XMT
RCV G XMT

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
10. Bend the top half of the case as necessary to place it over the strain-relief
assembly. Do not snap the case together yet.
11. Insert one captive screw through a saddle washer, then insert the captive
screw with the washer on it through the hole in the DB25 end of the case.
Snap that side of the case closed. Repeat the process for the other side. Cable
installation is complete.
4.1.2 T WISTED -P AIR C ONNECTION U SING M ODULAR J ACKS
The modular versions of the HS RS-232↔Current Loop Converter Active
have an RJ-11 (CL091A-F, CL091A-M, CL091AE-F, CL091AE-M) or RJ-45
(CL092A-F, CL092A-M, CL092AE-F, CL092AE-M) jack mounted in the case.
These jacks are prewired for a standard telco wiring environment. To be sure
you have the right wiring, use the table below as a guide.
RCV G XMT

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
RJ-11 Signal RJ-45 Signal
1.....................GND†1...........................N/C
2.....................RCV- 2 ........................GND
3.....................XMT+ 3 ........................RCV-
4.....................XMT- 4 ........................XMT+
5.....................RCV+ 5 ........................XMT-
6.....................GND 6 ...........................RCV+
7...........................GND
8...........................N/C
†Connection to ground is optional
Figure 1. AT&T®standard color codes.
4.2 Completing the Installation
Once you have configured the Converter for DCE or DTE and connected the
twisted-pair wires correctly, simply plug the Converter into the RS-232 data
port. Remember to insert and tighten the two captive connector screwlocks.
The PWR light remains on as long as the power supply is connected and
supplying power. When the data is transmitted or received, the TD and RD
lights will flicker or appear to remain on (depending on the baud rate).
The HS RS-232↔Current Loop Converter Active requires 9 volts of DC
power.A 110- (for the “A” models) or 220-volt (for the “AE” models) power
supply is included with your Converter.
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Black
6 - White

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
Pin Signal
1...................................FG
2...................................TD
3...................................RD
4
5
6
8
20
7...................................GND
9...................................+V
Appendix A. RS-232C Pin Connections

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE
2
3
4
5
6
7
8
20
3
1
6
4
2
5
Level
Conversion
Amplifier
Constant
Current
Amplifier
Data
Detection
LED
Optocoupler
T
e
r
m
i
n
a
l
B
l
o
c
k
TX+
TX-
GND
RX-
RX+
9VDC
Level
Conversion
Amplifier
Data
Detection
LED
Current
Limiter 9VDC
Constant
Current
Amplifier
Current
Source
Reference
DCE/DTE
Switch
Active/
Passive
Switch
NC NC
NC
Regulated
Power Supply
LED
Power
In
9VDC
Appendix B. Block Diagram

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HS RS-232↔CURRENT LOOP CONVERTER ACTIVE

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1996. Black Box Corporation. All rights reserved.