Black Box IC1020A User manual

CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX (o tside U.S. call 724-746-5500)
FREE technical s pport 24 ho rs a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Bla k Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.bla kbox. om • E-mail: info@bla kbox. om
JULY 2002
IC1020A
IC1021A
IC1022A
Dual-Port USB Hub—RS-232/422/485
Quad-Port USB Hub—RS-422/485
Quad-Port USB Hub—RS-232/422/485

1
FCC AND IC RFI STATEMENTS
FEDERAL COMMUNICATIONS COMMISSION
and INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
Class B Digital Device. This equipment has been tested and found to comply with
the limits for a Class B computing device pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful
interference in a residential installation. However, there is no guarantee that
interference will not occur in a particular installation. This equipment generates,
uses, and can radiate radio frequency energy, and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. If this equipment does cause harmful interference to radio or
telephone reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
• Consult an experienced radio/TV technician for help.
Caution
Changes or modifications not expressly approved by the party
responsible for compliance co ld void the ser’s a thority to operate
the eq ipment.
To meet FCC requirements, shielded cables and power cords are required to
connect this device to a personal computer or other Class B certified device.
This digital apparatus does not exceed the Class B 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 classe B prescrites dans le Règlement sur le brouillage
radioélectrique publié par Industrie Canada.

2
DUAL- AND QUAD-PORT USB HUBS
EMC Directive Statement
Products bearing the CE Label fulfill the requirements of the EMC directive
(89/336/EEC) and of the low-voltage directive (73/23/EEC) issued by the
European Commission.
To obey these directives, the following European standards must be met:
• EN55022 Class B—Limits and methods of measurement of radio interference
characteristics of information technology equipment.
• EN55024—Information technology equipment immunity characteristics limits
and methods of measurements.
• EN60950 (IEC950)—Safety of information technology equipment, including
electrical business equipment.
Always use the cabling provided with this product if possible. If no cable is
provided or if an alternate cable is required, use high-quality shielded cabling to
maintain compliance with EMC directives.

3
NOM STATEMENT
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.

4
DUAL- AND QUAD-PORT USB HUBS
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.

5
TRADEMARKS
TRADEMARKS USED IN THIS MANUAL
AT, IBM, and PS/2 are registered trademarks of International Business Machines
Corporation.
Windows is a registered trademark of Microsoft Corporation.
Any other trademarks mentioned in this manual are acknowledged to be the property of the
trademark owners.

6
DUAL- AND QUAD-PORT USB HUBS
Contents
Chapter Page
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 What’s Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Operating System Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 System Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Original Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Electrical Interface Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 Dual-Port USB Hub—RS-232/422/485 (IC1020A). . . . . . . . . . 12
4.2.2 Quad-Port USB Hub—RS-422/485 (IC1021A) . . . . . . . . . . . . . 15
4.2.3 Quad-Port USB Hub—RS-232/422/485 (IC1022A). . . . . . . . . 17
Appendix A. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
A.1 Troubleshooting Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
A.2 Calling Black Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
A.3 Shipping and Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Appendix B. Electrical Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B.1 RS-232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B.2 RS-422 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B.3 RS-485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Appendix C. Asynchronous Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7
1. Specifications
Standards: USB version 1.1
Speed: RS-232: Up to 460.8 kbps; RS-422/485: Up to 921.6 kbps
Indicators: IC1020A: (5) Status LEDs: (3) USB Enabled; (2) Port Activity;
IC1021A, IC1022A: (9) Status LEDs: (5) USB Enabled; (4) Port Activity
Connectors: IC1020A: (1) USB Type B; (2) DB9 male;
IC1021A, IC1022A: (1) USB Type B, (4) DB9 male
Temperature Tolerance: Operating: 32 to 122°F (0 to 50°C); Storage: -4 to +158F
(-20 to +70°C)
Relative Humidity: 10 to 90% noncondensing
Mean Time Between Failures (MTBF): Greater than 150,000 hours (calculated)
Power: 500 mA per port supplied from the USB root hub or a self-powered hub
Size: 1.5"H x 5.3"W x 7.1"H (3.8 x 13.5 x 18 cm)
Weight: 1 lb. (0.5 kg)
CHAPTER 1: Specifications

8
DUAL- AND QUAD-PORT USB HUBS
2. Introduction
2.1 Overview
The USB Hub equips the PC with 2 or 4 USB to RS-232/422/485 or RS-422/485
asynchronous serial ports. It gives you a versatile interface for common serial
needs. Three models are available:
• The Dual-Port USB Hub (IC1020A) has 2 USB ports to RS-232/422/485 serial
ports.
• The Quad-Port USB Hub (IC1021A) has 4 USB ports to RS-422/485
serial ports.
• The Quad-Port USB Hub (IC1022A) has 4 USB ports to RS-232/422/485
serial ports.
Unlike more traditional products, the USB Hub does not require opening the
computer case, nor does it require resources such as I/O ports or IRQs.
It does require a system that supports USB both in terms of hardware and
operating system.
2.2 What’s Included
The USB Hub is shipped with the following items.
• (1) Dual-Port USB Hub RS-232/422/485, Quad-Port USB Hub RS-422/485, or
Quad-Port USB Hub RS-232/422/485.
• (1) USB cable for connecting to the upstream host/hub.
• (1) CD-ROM disk containing drivers and installation software.
• This users’ manual.
If anything is missing or damaged, contact Black Box at 724-746-5500.
2.3 Technical Description
The Dual-Port USB Hub (IC1020A) uses two chips. The Quad-Port USB Hubs
(IC1021A and IC1022A) use four chips. These chips feature programmable baud
rate, data format, 128-byte dual-port TX buffer, and 384-byte dual-port RX buffer.
The RS-232/422/485 and the RS-422/485 transceivers support data rates up to
921.6 kbps for RS-422/485 and 460.8 kbps for RS-232.

9
CHAPTER 2: Introduction
2.4 Connector Pin Assignments
The IC1020A has one USB Type B connector and two DB9 male connectors.
The IC1021A and IC1022A have one USB Type B connector and four DB9 male
connectors. The pinouts for the DB9 connectors are described in Tables 2-1
and 2-2.
Table 2-1. RS-422/485 DB9 male connector pin assignments.
Signal Name Pin # Mode
RX+ Receive Data Positive 1 Input
RX- Receive Data Negative 2 Input
TX- Transmit Data Negative 3 Output
TX + Transmit Data Positive 4 Output
GND Ground —
RTS+ Request To Send Positive 6 Output
RTS- Request To Send Negative 7 Output
CTS- Clear To Send Negative 8 Input
CTS+ Clear To Send Positive 9 Input
Table 2-2. RS-232 DB9 male connector pin assignments.
Signal Name Pin # Mode
DCD Data Carrier Detect 1 Input
RX Receive Data 2 Input
TX Transmit Data 3 Output
DTR Data Terminal Ready 4 Output
GND Ground —
DSR Data Set Ready 6 Input
RTS Request To Send 7 Output
CTS Clear To Send 8 Input
RI Ring Indicator 9 Input

10
DUAL- AND QUAD-PORT USB HUBS
3. Installation
3.1 Operating System Installation
Choose Install Software at the beginning of the CD and follow the prompts to
install SeaCOM.
3.2 System Installation
The screen capture shown in Figure 3-1 is taken from a Windows®98 installation.
Your particular operating system may differ slightly from what is shown, based on
your version of Windows.
The USB Hub can be connected to any upstream type A port either at the PC host
or an upstream hub. The USB Hub is hot pluggable, meaning that you don’t have
to power down your computer before installation.
Connect the USB Hub to an upstream host or hub.
The New Hardware Found wizard will now locate the appropriate drivers. These
drivers were installed during the software setup procedure. Once the drivers are
found, a new window will pop up indicating the installation of each of the four
new ports.
If you view the Device Manager, you should have new COM ports in the Ports
(COM & LPT) device class; this is shown in Figure 3-1.

11
CHAPTER 3: Installation
Figure 3-1. System Properties screen, Device Manager tab.
You can access your new COM ports by using the assigned COM identifiers as
shown in Figure 3-1. In this case, it is COM3, 4, 5, and 6. However, this assignment
will vary from system to system. At this point, the hardware is recognized and ready
to use.

12
DUAL- AND QUAD-PORT USB HUBS
4. Configuration
4.1 Original Configuration
This device ships with the following configuration:
• 422 mode,
• 120 ohm termination,
• 1 K-ohm pull-up resistance on RX+, and
• 1 K-ohm pull-down resistance on RX-.
To change this configuration, you must open the box. Do this by removing the
four screws located on the bottom. When reassembling, please note that the top
and bottom are keyed to fit in only one direction.
4.2 Electrical Interface Selection
Each of the two DB9 ports on the IC1020A can be individually configured as an
RS-232, RS-422 (2-wire operation), or RS-485 (2- or 4-wire operation) interface.
Each of the four DB9 ports on the IC1021A is configured as RS-422 or RS-485.
Each of the four DB9 ports on the IC1022A can be configured as RS-232, RS-422,
or RS-485. This is selectable via the DIP switches and jumper shunts. The switch
and jumper positions are described in Sections 4.2.1 through 4.2.3.
4.2.1 D UAL -P ORT USB H UB —RS-232/422/485 (IC1020A)
You have a variety of configuration options for the two DB9 ports on the Dual-Port
USB Hub. You can set both ports as RS-232, both ports as RS-422, both ports as
RS-485, or any combination of these interfaces. You also need to select termination
(ON or OFF) for each port, and pull-up and pull-down resistors (ON or OFF) for
each port. When selecting a configuration for your Hub, refer to Tables 4-1
through 4-3 and Figures 4-1 and 4-2.
Jumpers E5, E6, E7, and E8
To configure Port 1 on the Dual-Port USB Hub for RS-232, select Jumper E8 on
the circuit board. To configure Port 2 for RS-232, select Jumper E5. (See Table
4-1.) You do not need to set any DIP switches to configure Port 1 or 2 for RS-232.

13
CHAPTER 4: Configuration
Table 4-1. Jumper settings.
Jumper Port RS-232 RS-422/485
E 2 X
E6 2 X
E7 1 X
E8 1 X
Switch SW4 Settings
To configure the ports on the Dual-Port USB Hub for RS-422/RS-485 instead of
RS-232, select Jumper E7 for Port 1 and Jumper E6 for Port 2. (See Table 4-1.)
When you are running RS-422 or RS-485, you also need to set switch SW4, positions
1 through 10 (see Figure 4-1 and Table 4-2). For example, to set RS-485 2-wire
operation on Port 1, set SW4-1 and 4-2 to ON. For RS-485 4-wire operation,
regardless of the interface, SW4-3 and SW4-8 are always set to ON. Pull-down
resistor (PD) for Port 1 (SW4-4) and pull-up resistor (PU) for Port 1 (SW4-5) can
also be set to ON or OFF for RS-422 or RS-485. Pull-down resistor (PD) for Port 2
(SW4-9) and pull-up resistor (PU) for Port 2 (SW4-10) can also be set to ON or
OFF for RS-422 or RS-485 operation.
Figure 4-1. Switch SW4.
NOTE
Switch positions SW4-1, 2, 3, 4, and 5 are for Port 1. Switch positions
SW4-6, 7, 8, 9, and 10 are for Port 2.

14
DUAL- AND QUAD-PORT USB HUBS
Table 4-2. DIP-switch SW4 settings.
Switch Switch Port Description RS-485 RS-422
Setting Number
L SW4-1 1 TX+ to RX+ ON OFF
L SW4-2 1 TX- to RX- ON OFF
T SW4-3 1 Termination ON ON
PD SW4-4 1 1K Pull-Down ON OFF
PU SW4- 1 1K Pull-Up ON OFF
L SW4-6 2 TX+ to RX+ ON OFF
L SW4-7 2 TX- to RX- ON OFF
T SW4-8 2 Termination ON ON
PD SW4-9 2 1K Pull-Down ON OFF
PU SW4-10 2 1K Pull-Up ON OFF
L = Loops TX+ to RX+ or RX- to TX- for two-wire operation.
T = Adds a 120-ohm termination resistor between RX+ and RX-.
PU = Pull-up. Adds a 1 K-ohm pull-up resistor to RX+.
PD = Pull-down. Adds a 1 K-ohm pull-down resistor to RX-.
Switch SW3 Settings
To select RS-485 mode (4-wire or 2-wire operation) or RS-422 mode (4-wire
operation), set the DIP switch labeled SW3 on the circuit board. (See Figure 4-2
and Table 4-3.)
Figure 4-2. RS-422/485 interface configuration.
NOTE
Switch positions SW3-1 and SW3-2 are for Port 1 and switch positions
SW3-3 and SW3-4 are for Port 2.

15
CHAPTER 4: Configuration
Table 4-3. DIP-switch SW3 settings.
Switch Switch Port Description RS-485 RS-422
Setting Number
48 SW3-1 1 48 Mode (4-wire) ON OFF
NE SW3-2 1 48 Mode, No Echo (2-wire) ON OFF
48 SW3-3 2 48 Mode (4-wire) ON OFF
NE SW3-4 2 48 Mode, No Echo (2-wire) ON OFF
NE = No Echo. In a two-wire setup, the receiver will not echo back the transmitted
data.
4.2.2 Q UAD -P ORT USB H UB —RS-422/485 (IC1021A)
Each of the four DB9 ports on the Quad-Port USB Hub can be set as either RS-422
or RS-485. You do not need to set a jumper to select these options. Instead, you just
need to set DIP-switches SW1, SW2, SW3, and SW4.
Switch SW2 and SW4 Settings
To select either RS-422 or RS-485, set the DIP switches labeled SW2 and SW4 on
the circuit board (see Figure 4-3). Table 4-4 lists the possible settings for DIP-
switches SW2 and SW4. You can also set termination, pull-up resistance, and pull-
down resistance via these switches.
Figure 4-3. Switches SW2 and SW4.
NOTE
Switch positions SW4-1, 2, 3, 4, and 5 are for Port 1. Switch positions
SW4-6, 7, 8, 9, and 10 are for Port 2. Switch positions SW2-1, 2, 3, 4, and
5 are for Port 3. Switch positions SW2-6, 7, 8, 9, and 10 are for Port 4.

16
DUAL- AND QUAD-PORT USB HUBS
Table 4-4. DIP-switches SW2 and SW4 settings.
Switch Switch Port Description RS-485 RS-422
Setting Number
L SW2-1 3 TX+ to RX+ ON OFF
L SW2-2 3 TX- to RX- ON OFF
T SW2-3 3 Termination ON ON
PD SW2-4 3 1K Pull-Down ON OFF
PU SW2- 3 1K Pull-Up ON OFF
L SW2-6 4 TX+ to RX+ ON OFF
L SW2-7 4 TX- to RX- ON OFF
T SW2-8 4 Termination ON ON
PD SW2-9 4 1K Pull-Down ON OFF
PU SW2-10 4 1K Pull-Up ON OFF
L SW4-1 1 TX+ to RX+ ON OFF
L SW4-2 1 TX- to RX- ON OFF
T SW4-3 1 Termination ON ON
PD SW4-4 1 1K Pull-Down ON OFF
PU SW4- 1 1K Pull-Up ON OFF
L SW4-6 2 TX+ to RX+ ON OFF
L SW4-7 2 TX- to RX- ON OFF
T SW4-8 2 Termination ON ON
PD SW4-9 2 1K Pull-Down ON OFF
PU SW4-10 2 1K Pull-Up ON OFF
L = Loops TX+ to RX+ for two-wire operation.
T = Adds a 120-ohm termination resistor between RX+ and RX-.
PU = Pull-up. Adds a 1 K-ohm pull-up resistor to RX+.
PD = Pull-down. Adds a 1 K-ohm pull-down resistor to RX-.
Switch SW1 and SW3 Settings
To select RS-485 mode (4-wire or 2-wire operation) or RS-422 mode (4-wire
operation), set the DIP switches labeled SW1 and SW3 on the circuit board.
(See Figure 4-4 and Table 4-5.)

17
CHAPTER 4: Configuration
Figure 4-4. RS-422/485 interface configuration.
NOTE
Switch positions SW3-1 and 2 are for Port 1, SW3-3 and 4 are for Port 2,
SW1-1 and 2 are for Port 3, and SW1-3 and 4 are for Port 4.
Table 4-5. DIP-switch SW1 and SW3 settings.
Switch Switch Port Description RS-485 RS-422
Setting Number
48 SW1-1 3 48 Mode (4-wire) ON OFF
NE SW1-2 3 48 Mode, No Echo (2-wire) ON OFF
48 SW1-3 4 48 Mode (4-wire) ON OFF
NE SW1-4 4 48 Mode, No Echo (2-wire) ON OFF
48 SW3-1 1 48 Mode (4-wire) ON OFF
NE SW3-2 1 48 Mode, No Echo (2-wire) ON OFF
48 SW3-3 2 48 Mode (4-wire) ON OFF
NE SW3-4 2 48 Mode, No Echo (2-wire) ON OFF
NE = No Echo. In a two-wire setup, the receiver will echo back all transmitted data.
4.2.3 Q UAD -P ORT USB H UB —RS-232/422/485 (IC1022A)
You have a variety of configuration options for the four DB9 ports on the Quad-
Port USB Hub. You can set all ports as RS-232, all ports as RS-422, all ports as RS-
485, or any combination of these interfaces. You also need to select termination
(ON or OFF) for each port, and pull-up and pull-down resistors (ON or OFF) for

18
DUAL- AND QUAD-PORT USB HUBS
each port. When selecting a configuration for your Hub, refer to Tables 4-6
through 4-8 and Figures 4-5 and 4-6.
Jumpers E1, E2, E3, E4, E5, E6, E7, and E8
To configure Port 1 on the Quad-Port USB Hub for RS-232, select Jumper E8 on
the circuit board. To configure Port 2 for RS-232, select Jumper E5. To configure
Port 3 for RS-232, select Jumper E4, and for Port 4, select Jumper E1. (See Table
4-6 for all the jumper settings.)
Table 4-6. Jumper settings.
Jumper Port RS-232 RS-422/485
E1 4 X
E2 4 X
E3 3 X
E4 3 X
E 2 X
E6 2 X
E7 1 X
E8 1 X
Switch SW2 and SW4 Settings
To select RS-485 mode (4-wire or 2-wire operation) or RS-422 mode (4-wire
operation), as well as termination, pull-up resistance, and pull-down resistance, set
the DIP switches labeled SW2 and SW4 on the circuit board. (See Figure 4-5 and
Table 4-7.)

19
CHAPTER 4: Configuration
Figure 4-5. Switches SW2 and SW4.
NOTE
Switch positions SW4-1, 2, 3, 4, and 5 are for Port 1. Switch positions
SW4-6, 7, 8, 9, and 10 are for Port 2. Switch positions SW2-1, 2, 3, 4, and
5 are for Port 3. Switch positions SW2-6, 7, 8, 9, and 10 are for Port 4.
Table 4-7. DIP-switches SW2 and SW4 settings.
Switch Switch Port Description RS-485 RS-422
Setting Number
L SW2-1 3 TX+ to RX+ ON OFF
L SW2-2 3 TX- to RX- ON OFF
T SW2-3 3 Termination ON ON
PD SW2-4 3 1K Pull-Down ON OFF
PU SW2- 3 1K Pull-Up ON OFF
L SW2-6 4 TX+ to RX+ ON OFF
L SW2-7 4 TX- to RX- ON OFF
T SW2-8 4 Termination ON ON
PD SW2-9 4 1K Pull-Down ON OFF
PU SW2-10 4 1K Pull-Up ON OFF
L SW4-1 1 TX+ to RX+ ON OFF
L SW4-2 1 TX- to RX- ON OFF
T SW4-3 1 Termination ON ON
PD SW4-4 1 1K Pull-Down ON OFF
PU SW4- 1 1K Pull-Up ON OFF
L SW4-6 2 TX+ to RX+ ON OFF
L SW4-7 2 TX- to RX- ON OFF
T SW4-8 2 Termination ON ON