Black Box USB Director RS-232 User manual

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Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
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CUSTOMER
SUPPORT
INFORMATION
NOVEMBER 1994
IC221A-R3
RS-232 ↔V.35 Interface Converter
DSR CTS DATA PWR DSR CTS DATA
232 V.35

RS-232 ↔V.35 INTERFACE CONVERTER
2
FEDERAL COMMUNICATIONS COMMISSION
RADIO FREQUENCY INTERFERENCE STATEMENT
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 required 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 édicté
par le ministère des Communications du Canada."

RS-232 ↔V.35 INTERFACE CONVERTER
3
CONTENTS
1.0 SPECIFICATIONS ......................................................................................................................................4
2.0 INTRODUCTION ......................................................................................................................................5
3.0 INSTALLATION.........................................................................................................................................6
3.1 DIP Shunt Settings........................................................................................................................7
3.2 Terminal Ready Option Strap W7................................................................................................8
3.3 LEDs ..............................................................................................................................................8
4.0 GROUND STRAP AND PIN CONNECTIONS ........................................................................................9
4.1 Ground Strap ................................................................................................................................9
4.2 Pin Connections..........................................................................................................................10

RS-232 ↔V.35 INTERFACE CONVERTER
4
Speed — Up to 64 Kbps
UL — E87344
CSA — LR58206
MTBF — 125,905 hours
Interface — RS-232, V.35; both interfaces DTE/DCE selectable
Connectors — RS-232: DB25 male; V.35: (1) 34-pin female "M" block
Environmental — Maximum storage temperature: 70° C
Maximum operating temperature: 50° C
Power — 115 VAC, 60 Hz, 13 watts (230-VAC model available on request)
Size — Standalone: 2.3"H x 8"W x 11.9"D (5.8 x 20.3 x 30.2 cm)
Rackmount: Card: 1.2"H x 7.5"W x 10.5"D (3 x 19.1 x 26.7 cm)
Weight — 2 lb. (0.9 kg)
1.0 Specifications

CHAPTER 2: Introduction
5
The RS-232↔V.35 Interface Converter comes in
standalone units for 115-VAC and 230-VAC
operation. A card version is also available for
rackmounted units. The Card is used for both
115-VAC and 230-VAC operation.
The RS-232↔V.35 Interface Converter provides
bidirectional conversion of all the commonly used
V.35 and RS-232 signals. The unit is designed for
use with one port configured as Data Terminal
Equipment (DTE) and the other port as Data
Communications Equipment (DCE). You should
not operate the unit with both ports configured as
DCE or both ports configured as DTE.
The unit has two jumper-selectable configurations.
One connects RS-232 modem equipment to V.35
terminal equipment (DTE to DCE). The other
connects V.35 modem equipment to RS-232
terminal equipment (DCE to DTE). Both
configurations allow bidirectional data transfer.
Figure 2-1 shows a typical application of the
RS-232↔V.35 Interface Converter.
2.0 Introduction
RS-232
TERMINAL
COMPUTER
(DTE)
RS-232/V.35
DCE DTE V.35
MODEM
DSU
(DCE)
RS-232/V.35
DTE DCE V.35
TERMINAL
COMPUTER
(DTE)
RS-232
MODEM
(DCE)
Figure 2-1. Typical Application of the RS-232<—>V.35 Interface Converter.
RS-232 ↔ V.35
INTERFACE
CONVERTER
RS-232 ↔ V.35
INTERFACE
CONVERTER

RS-232 ↔V.35 INTERFACE CONVERTER
6
To install the unit, follow the steps below and refer
to Figure 3-1.
1.Attach the cable from the RS-232 device to the
25-pin male connector (J1) on the rear panel of
the RS-232↔V.35 Interface Converter.
2.Attach the cable from the V.35 device to the
34-pin female connector (J2) on the rear panel
of the RS-232↔V.35 Interface Converter.
3.Plug the 4-pin power cord into the receptacle on
the rear panel of the case. Do not plug the
power module into an AC outlet until after the
DIP shunts and Strap W7 are set as explained in
Sections 3.1 and 3-2.
3.0 Installation
Figure 3-1. Strap Selections for RS232 DCE ↔V.35 DTE.
PWR
DATA
CTS
DSR
U11 U10 U9
U1
U2
U3
U4
U5
U6
U8
U7
DCE
DTE
DCE
DTE
DCE
DTE
DTE
DCE
XW2B
XW3A
XW3B
XW1A
XW1B
XW2A
XW4B
XW4A
PI
J2
J1 RS-232
INTERFACE
V.35
INTERFACE
AC POWER
CONNECTOR
C3C2C1C4
VR1
DSR
CTS
DATA
RS232
INDICATORS
V.35
INDICATORS

CHAPTER 3: Installation
7
3.1 DIP Shunt Settings
The RS-232↔V.35 Interface Converter has two
jumper-selectable configurations determined by
DIP shunt settings located inside the unit on the
printed circuit board. Figure 3-1 shows how to
configure the RS-232 side of the converter for DCE
and the V.35 side as DTE. This configuration should
be used when connecting RS-232 DTE equipment
to V.35 DCE equipment, such as a computer to a
CSU/DSU.
U11 U10 U9
U1
U2
U3
U4
U5
U6
U8
U7
DCE
DTE
DCE
DTE
DCE
DTE
DTE
DCE
XW2B
XW3A
XW3B
XW1A
XW1B
XW2A
XW4B
XW4A
PI
J2
J1
C3C2C1C4
VR1
Figure 3-2. Strap Selections for V.35 DCE ↔ RS232 DTE .
Figure 3-2 shows the converter configured for RS-
232 DTE and the V.35 side as DCE. This
configuration should be used when connecting RS-
232 DCE equipment to V.35 DTE equipment.

RS-232 ↔V.35 INTERFACE CONVERTER
8
3.2 Terminal Ready Option Strap W7
NOTE
All printed circuit boards identified with
a date code of 8926 and later have the
revised connector with Pin H
supported. In earlier models, Strap W7
controls Pin 20 only.
Strap W7 controls the Terminal Ready (Pin H) and
DTR (Pin 20) function. When the RS-232 port is
configured as DCE, and the V.35 port is configured
as DTE, a jumper over B and C forces Terminal
Ready (Pin H) out of the V.35 port (default). The
jumper between A and B passes DTR (Pin 20) to
Terminal Ready (Pin H).
With the RS-232 port configured as DTE and the
V.35 port configured as DCE mode, a jumper from
B to C forces DTR (Pin 20) out of the RS-232 port
(default). A jumper between A and B passes
terminal ready (Pin H) to DTR (Pin 20).
NOTE
Due to the fact that the LEDs indicate
only incoming signals, the true status
of DTR out will not be reflected by the
LED when strap W7 is placed in the
B-C position. Refer to the diagrams in
Section 4.2.
3.3 LEDs
The RS-232↔V.35 Interface Converter is equipped
with seven LED indicators located on the front
panel. The PWR LED illuminates when power is
applied to the unit.
The three left-most LEDs indicate the state of the
INCOMING V.35 signals. If the V.35 interface is
configured as DTE, the LEDs have the following
meanings:
•DSR — Reflects the state of DSR (Pin E)
•CTS — Indicates the CTS (Pin D)
•Data — Indicates Rx data (Pins R and T)
If the V.35 interface is configured for DCE, the
LEDs have the following meanings:
•DSR — Not connected, off.
•CTS — Indicates the status of RTS (Pin C)
•Data — Indicates Tx data (Pins P and S)
The three right-most LED indicators show the state
of the INCOMING RS-232 signals. If the RS-232
interface is configured as DTE, the LEDs have the
following meanings:
•DSR — Indicates the state of DSR (Pin 6)
•CTS — Indicates the state of CTS (Pin 5)
•Data — Indicates Rx data (Pin 3)
If the RS-232 interface is configured as DCE, the
LEDs have the following meanings:
•DSR— Indicates the state of DTR (Pin 20)
•CTS — Indicates the state of RTS (Pin 4)
•Data — Indicates Tx data (Pin 2)
Table 3-1. Setting the DIP Shunts.
RS-232 INTERFACE V.35 INTERFACE
DCE/DTE Put Shunt In: DCE/DTE Put Shunt In:
DCE XW1A and XW2A DCE XW3A and XW4A
DTE XW1B and XW2B DTE XW3B and XW4B

CHAPTER 4: Ground Strap and Pin Connections
9
4.1 Ground Strap
Signal grounds (Pin 7 on the RS-232 interface and
Pin B on the V.35 interface) are connected to each
other but not connected to chassis ground (Pin A).
However, for applications requiring the grounds at
a common reference point, the grounds can be
connected by installing a jumper strap across W1
located at the rear of the printed circuit board
between J1 and P1.
4.0 Ground Strap and Pin Connections
B
D
F
J
L
BB
R
T
V
X
SIGNAL GROUND
CLEAR TO SEND
RECEIVE LINE SIGNAL DETECT
LOCAL LOOPBACK
TEST PATTERN
REMOTE LOOPBACK
RECEIVED DATA
RECEIVED DATA
RECEIVE TIMING
RECEIVE TIMING
CHASSIS GROUND
REQUEST TO SEND
DATA SET READY
DATA TERMINAL READY
TEST MODE
REMOTE LOOPBACK
TRANSMITTED DATA
TRANSMITTED DATA
TRANSMIT TIMING
TRANSMIT TIMING
A
C
E
H
K
AA
P
S
U
W
YTRANSMIT TIMING
Figure 4-1. V.35 Interface (male).
Figure 4-2. RS-232 Interface (male).
1 PROTECTIVE GROUND
2 TRANSMITTED DATA
3 RECEIVED DATA
4 REQUEST TO SEND
5 CLEAR TO SEND
6 DATA SET READY
7 SIGNAL GROUND/COMMON RETURN
8 RECEIVED LINE SIGNAL DETECTOR
9
10
11
12
13
14
DCE TRANSMITTER SIGNAL ELEMENT TIMING 15
16
RECEIVER SIGNAL ELEMENT TIMING 17
18
19
DATA TERMINAL READY 20
SIGNAL QUALITY DETECTOR 21
RING INDICATOR 22
23
DTE TRANSMITTER SIGNAL ELEMENT TIMING 24
25

RS-232 ↔V.35 INTERFACE CONVERTER
10
4.2 Pin Connections
The pin connections for RS-232 DCE to V.35 DTE
are shown below.

CHAPTER 4: Ground Strap and Pin Connections
11
The pin connections for RS-232 DTE to V.35 DCE
are shown below.
(V.35 DSR LED)
NOTE
PIN 20 (DTR) IS PULLED HIGH WITH
W7 IN THE POSITION SHOWN.

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1994. Black Box Corporation. All rights reserved.