Black Box CL080A-F User manual

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: [email protected]
JULY 1997
CL080A-F CL081A-M
CL080A-M CL082A-F
CL081A-F CL082A-M
HS RS-232↔60 ma Current Loop
Converter
HS RS232-60ma
Current Loop
Converter

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
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 B 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 Industry Canada.
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 Industrie Canada.
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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HS RS-232↔60 MA CURRENT LOOP CONVERTER
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 aparato 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.
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.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
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 equipo 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↔60 MA CURRENT LOOP CONVERTER
Contents
Chapter Page
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Setting the DCE/DTE Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Twisted-Pair Wiring Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.1 Twisted-Pair Connection Using Terminal Blocks . . . . . . . . . . 9
4.1.2 Twisted-Pair Connection Using Modular Jacks. . . . . . . . . . . 15
4.2 Completing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Appendix: RS-232C Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
1. Specifications
Transmission Line—19 to 26 AWG twisted pair
Range—4 miles on 24 AWG twisted pair
Interfaces—Asynchronous, EIA RS-232, ITU/CCITT V.24 full duplex,
60-mA current loop (4-wire full duplex only)
Data Rates—0 to 115.2 kbps
Isolation—2500 V RMS via opto-isolators
Surge Suppression—Over-voltage protection for opto-isolators via Silicon
Avalance Diodes
Connectors—CL080A-F: (1) DB25 female, (1) terminal block; CL080A-M:
(1) DB25 male, (1) terminal block; CL081A-F: (1) DB25 female, (1) RJ-45;
CL081A-M: (1) DB25 male, (1) RJ-45; CL082A-F: (1) DB25 female,
(1) RJ-11; CL082A-M: (1) DB25 male, (1) RJ-11
Power Supply—No external power required; uses power from RS-232
interface
Temperature Range—32 to 122°F (0 to 50°C)
Altitude—Up to 15,000 feet
Humidity—5 to 95% noncondensing
Size—1.2"H x 0.75"W x 2.5"D (3.1 x 1.9 x 6.4 cm)
Weight—1.5 oz.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
2. Introduction
The HS RS-232↔60 ma Current Loop Converter lets an asynchronous
RS-232 device communicate with a 60-mA current-loop device. The
Converter requires no AC power or batteries to operate and supports data
rates to 115.2 kbps.
Operating full duplex, the Converter supports communication distances up
to 4 miles over two unconditioned 24 AWG twisted pair, depending on the
data speed. To guard against data loss due to ground loops, the Converter is
equipped with 2500 V RMS optical isolators.
The Converter connects directly to the RS-232 interface using a male or
female DB25 connector. Two-pair cable running to the 60-mA current-loop
device attaches to the Converter by an RJ-11 jack, RJ-45 jack, or terminal
blocks with built-in strain relief. An external DCE/DTE switch on the
Converter eliminates the need for a crossover cable on the RS-232 interface.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
3. Configuration
The Converter is designed to be easy to use. There are no internal jumpers
or DIP switches to set, so there is no need to open the case to configure the
unit (you may need to open the case for wire connection—refer to Chapter
4). The only configuration necessary for operation is proper setting of the
external DCE/DTE switch.
The diagram below shows the location of the DCE/DTE switch on the PC
board, as well as the location of the terminal block and surge suppressors (“S”
model only).
Figure 3-1. PC Board.
DCE DTE
DCE/DTE
Switch
Opto-Isolator
Terminal Block
Opto-Isolator

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
3.1 Setting the DCE/DTE Switch
For your convenience, the Converter has an externally accessible DCE/DTE
switch. If the RS-232 device connected to the Converter is a modem or
multiplexor (or is wired like one), set the switch to “DTE.” This setting causes
the Converter to behave like Data Terminal Equipment and transmit data on
pin 2.
If the RS-232 device connected to the Converter is a PC, terminal or host
computer (or is wired like one), set the switch to “DCE.” This setting causes
the Converter to behave like Data Communications Equipment and transmit
data on pin 3.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
4. Installation
The Converter is simple to install. After configuring the DTE/DCE switch,
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.
4.1 Twisted-Pair Wiring Overview
Only one Converter is needed for each RS-232 to 60-mA current-loop circuit.
The Converter 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 larger gauges. When you have completed wiring for
your data circuit, the pin connections should be as shown below:
XMT+ -------------------------------------------------------------------RCV+
XMT- --------------------------------------------------------------------RCV-
G -----------------------To Shield (Optional)-------------G
RCV+ --------------------------------------------------------------------XMT+
RCV - ---------------------------------------------------------------------XMT -
4.1.1 T WISTED -P AIR C ONNECTION U SING T ERMINAL B LOCKS
The terminal-block/strain-relief version of the Converter 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.
1. Open the unit by gently inserting a screwdriver between the DB25
connector and the lip of the plastic case (see Figure 4-2). You don’t have
to worry about breaking the plastic, but be careful not to bend the D-sub
connector.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
Figure 4-2. Opening the Unit.
Figure 4-3. Opening the Unit.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
2. Strip the outer insulation from the twisted pairs about one inch from
the end.
3. Strip back the insulation on each of the 2 twisted-pair wires about
1⁄4 inch.
Figure 4-4. Stripping the Insulation.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
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, and 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, and 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.
7. When you finish connecting the wires to the terminal block, the assembly
should resemble the diagram below:
Figure 4-5. Terminal Block Assembly.
DCE DTE
RCV
- +
GXMT
- +

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
8. Place the 2 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 2 inches from the terminal posts and press together firmly.
Figure 4-6. Strain Relief Assembly.
9. Insert the strain-relief assembly with the wire going through it into the
slot in the bottom half of the modem case and set it into the recess in the
case.
DCE DTE
RCV
- +
GXMT
- +

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
Figure 4-7. Inserting the Strain Relief Assembly into the Slot.
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.
RCM
- +
GXMT
- +

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
11. Insert one captive screw through a saddle washer and 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. This completes the cable installation process.
4.1.2 T WISTED P
AIR C ONNECTION U SING M ODULAR J
ACKS
The modular versions of the Converter have an RJ-11 or RJ-45 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.
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 4-8. Modular Jacks.
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↔60 MA CURRENT LOOP CONVERTER
4.2 Completing the Installation
Once you have configured the unit for DTE or DCE 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 screws.
The Converter requires no power supply or batteries for operation. It will
work automatically at any data rate from 50 to 115.2 kbps, as long as there is
any data or control voltage being applied.

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
Appendix: RS-232C Pin Configurations
Figure A-1. Standard DCE Setting.
Data Term. Ready (DTR) - 20
1- (FG) Frame Ground
2- (TD) Transmit Data
3- RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect
To Converter
From Converter
To Converter
From Converter
From Converter
From Converter
To Converter
DIRECTION STANDARD “DCE” SETTING DIRECTION

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HS RS-232↔60 MA CURRENT LOOP CONVERTER
Figure A-2. Standard DTE Setting.
Data Term. Ready (DTR) - 20
1- (FG) Frame Ground
2- (TD) Transmit Data
3- RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect
From Converter
To Converter
From Converter
To Converter
To Converter
To Converter
From Converter
DIRECTION STANDARD “DTE” SETTING DIRECTION

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1997. Black Box Corporation. All rights reserved.