Quatech DSCLP-100 User Manual

DSCLP/SSCLP-100

Two Channel Low Profile RS-232

Asynchronous Communications Adapter

for PCI bus

User's Manual

QUATECH, INC. TEL: [phone]
662 Wolf Ledges Parkway FAX: [phone]
Akron, Ohio 44311 http: //www.quatech.com

? 2002, Quatech, Inc.

NOTICE

The information contained in this document cannot be reproduced in any form
without the written consent of Quatech, Inc. Likewise, any software programs that
might accompany this document can be used only in accordance with any license
agreement(s) between the purchaser and Quatech, Inc. Quatech, Inc. reserves the right
to change this documentation or the product to which it refers at any time and without
notice.

The authors have taken due care in the preparation of this document and every
attempt has been made to ensure its accuracy and completeness. In no event will
Quatech, Inc. be liable for damages of any kind, incidental or consequential, in regard to
or arising out of the performance or form of the materials presented in this document or
any software programs that might accompany this document.

Quatech, Inc. encourages feedback about this document. Please send any
written comments to the Technical Support department at the address listed on the
cover page of this document.

DOS, Windows 95/98/2000/ME , Windows NT are trademarks or registered trademarks of Microsoft
Corporation. OS/2 is a registered trademark of IBM Corporation. All other trademarks or registered

trademarks are property of their respective owners.

iv DSCLP/SSCLP-100 User's Manual

WARRANTY INFORMATION

Quatech, Inc. warrants the DSCLP-100 or SSCLP-100 to be free of defects for
five (5) years from the date of purchase. Quatech, Inc. will repair or replace any board that fails to
perform under normal operating conditions and in accordance with the procedures outlined in this
document during the warranty period. Any damage that results from improper installation, operation, or
general misuse voids all warranty rights.

Please complete the following information and retain for your records. Have this information
available when requesting warranty service.

DATE OF PURCHASE:

MODEL NUMBER: DSCLP-100 or SSCLP-100

PRODUCT DESCRIPTION: Two or One Channel Low Profile RS-232

Asynchronous PCI Bus
Communications Adapter

SERIAL NUMBER:

DSCLP/SSCLP-100 User's Manual i

Declaration of Conformity

Manufacturer's Name: Quatech Inc.

Manufacturer's Address: 662 Wolf Ledges Parkway

Akron, Ohio 44311 (USA)

Application of Council Directive: 89/336/EEC

Standards to which
Conformity is Declared: * EN50081-1 (EN55022,

EN60555-2, EN60555-3)
* EN50082-1 (IEC 801-2,
IEC 801-3, & IEC 801-4)

Type of Equipment: Information Technology

Equipment

Equipment Class: Commercial, Residential, & Light
Industrial

Product Name: PCI Quad Serial Communications

Card

Model Number : DSCLP-100

ii DSCLP/SSCLP-100 User's Manual

Table of Contents

1 General Information
2 Hardware Configuration

2.1 Factory Default Configuration

2.2 Enable Scratchpad Register (SPAD, J2)

.................................................

...........................................

........................................

.............................

2.3 Force High-Speed UART Clock (X2 or X4, J4-J5)

3 Hardware Installation
4 Address Map and Special Registers

4.1 Base Address and Interrupt Level (IRQ)

4.2 Enabling the Special Registers

4.3 Interrupt Status Register

4.4 Options Register

........................................................

4.4.1 Enhanced Serial Adapter Identification

4.4.2 Clock Rate Multiplier

5 Windows Configurations

5.1 Windows Millennium

5.2 Windows 2000

5.3 Windows 98

5.4 Windows 95

5.5 Using the "New Hardware Found" Wizard

5.6 Viewing Resources with Device Manager

.........................................................

............................................................

............................................................

...............................................

............................

.............................

........................................

...............................................

...........................

..............................................

..........................................

..................................................

.........................

...........................

..................

1
2

2
2
3

4
6

6
7
7
8
8

10
11

11
12
13
14
14
16

6 Other Operating Systems

6.1 Windows NT

6.2 OS/2

.....................................................................

6.3 DOS and other operating systems

6.3.1 QTPCI.EXE

7 External Connections
8 PCI Resource Map
9 Specifications
10 Troubleshooting

DSCLP/SSCLP-100 User's Manual iii

...........................................................

........................................................

...............................................

..................................................

..........................................................

.....................................................

.........................................

....................................

19
19
19
19
20

23
25
26
28

1 General Information

The Quatech, Inc. DSCLP-100 (two-port) and SSCLP-100 (one-port)
provides upto two RS-232 asynchronous serial communication interfaces for Low
Profile IBM-compatible personal computer systems using the PCI expansion bus. The
DSCLP-100 uses Quatech's new Enhanced Serial Adapter design. Legacy serial port
data rates are limited to a maximum of 115,200 bits per second. This discussion relates
to DSCLP-100. A SSCLP-100 is just one port in the discussion.

As a PCI device, the DSCLP-100 requires no hardware configuration. The
card is automatically configured by the computer's BIOS or operating system. The two
serial ports share a single interrupt line and are addressed in a contiguous block of 16
bytes. A special interrupt status register is provided to help software to manage the
shared interrupt.

The DSCLP-100's serial ports are implemented using 16550 Universal
Asynchronous Receiver/Transmitters (UARTs). These UARTs contain hardware
buffers (FIFOs) which reduce processing overhead and allow higher data rates to be
achieved.

The DSCLP-100 is supported under several popular operating systems and
environments. Contact the sales department for details on current software offerings.
Most device drivers are available for download from the Quatech world wide web site
at http://www.quatech.com.

DSCLP/SSCLP-100 User's Manual 1

2 Hardware Configuration

The DSCLP-100 is automatically configured at boot time by the computer's
BIOS or operating system. There are no required switches or jumpers to set for
installation.

This chapter lists a number of optional jumper settings that control various
hardware features. Jumpers J2, J4-J5 are grouped together at the end of the board
opposite the HD-44 connector. Any changes from the factory default should be made
before installing the DSCLP-100 in the computer.

2.1 Factory Default Configuration

Figure 2 shows the jumper configuration as shipped from the factory, with two
spare jumpers applied in neutral positions. Remove one or both and apply as shown in
following sections to set optional features.

J2

J4

J5

SPAD

X4
X2

Figure 2 --- Factory default jumper configuration

2.2 Enable Scratchpad Register (SPAD, J2)

In the default configuration, an Interrupt Status Register and an Options Register
(see page 0) replace the scratchpad (base address + 7) of each UART. If the SPAD
jumper is applied as in Figure 3, the UART scratchpad registers are enabled, and the
Interrupt Status Register and the Options Register are not available.

J2

J4

SPAD

X4

J5

X2

Figure 3 --- Enable scratchpad registers

2.3 Force High-Speed UART Clock (X2 or X4, J4-J5)

2 DSCLP/SSCLP-100 User's Manual

These jumpers force an increase of the UART input clock frequency by a factor

Baud rates up to 230.4 kbps

software control

of two or four. This feature can allow legacy software to use baud rates above
115,200 bits per second. It is also useful if the serial port device driver does not
directly support setting the higher baud rates through the Options Register (see page 0).

If one of these jumpers is applied, it overrides any value written to the Options
Register to set the clock multiplier by software. The effective baud rate will be either
two or four times the value for which the UART itself is programmed.

The factory default is none of these jumpers applied, which allows for software
control of the clock multiplier via the Options Register. The Options Register powerup
default is for a standard times-1 clock of 1.8432 MHz for compatibility with standard
serial ports.

Figure 4 --- Clock multiplier jumper options

J2

J4

J5

Factory default

J2

J4

J5

Force times-four clock

Baud rates up to 460.8 kbps

SPAD

X4

X2

SPAD

X4

X2

J2

J4

J5

Force times-two clock

SPAD

X4

X2

DSCLP/SSCLP-100 User's Manual 3

3 Hardware Installation

1. Turn off the power of the computer system in which the DSCLP-100 is to be
installed.

2. Remove the system cover according to the instructions provided by the
computer manufacturer.

3. Make any desired optional jumper setting changes.

4. Install the DSCLP-100 in any empty PCI expansion slot. The board should be
secured by installing the Option Retaining Bracket (ORB) screw.

5. Replace the system cover according to the instructions provided by the
computer manufacturer.

6. Attach and secure the cable connectors to the desired equipment.

7. Turn on the power of the computer system.

The output of the DSCLP-100 is a 25-pin D-connector. A cable is provided

to convert the D-25 into two standard male D-9 connectors with all control signals
provided to each port (RTS, DTR, CTS, DSR, DCD, and RI).

Clock multiplier/
scratchpad select

J2

J4

J5

SPAD

X4

X2

Figure 5 --- Jumper/connector locations

4 DSCLP/SSCLP-100 User's Manual

(This page intentionally blank.)

DSCLP/SSCLP-100 User's Manual 5

4 Address Map and Special Registers

This chapter explains how the two UARTs and special registers are addressed,

as well as the layout of those registers. This material will be of interest to programmers
writing driver software for the DSCLP-100.

4.1 Base Address and Interrupt Level (IRQ)

The base address and IRQ used by the DSCLP-100 are determined by the

BIOS or operating system. Each serial port uses 8 consecutive I/O locations. The two
ports reside in a single block of I/O space in eight byte increments, for a total of 16
contiguous bytes, as shown in Figure 5.

I/O Address RangePort

Base Address + 0 to Base Address + 7Serial 1
Base Address + 8 to Base Address + 15Serial 2

Figure 6 --- Port Address Map

All two serial ports share the same IRQ. The DSCLP-100 signals a hardware

interrupt when any port requires service. The interrupt signal is maintained until no port
requires service. Interrupts are level-sensitive on the PCI bus.

The base address and IRQ are automatically detected by the device drivers

Quatech supplies for various operating systems. For cases where no device driver is
available, such as for operation under DOS, Quatech supplies the "QTPCI" DOS
software utility for manually determining the resources used. See page 0 for details.

6 DSCLP/SSCLP-100 User's Manual

4.2 Enabling the Special Registers

The DSCLP-100 contains two unique registers, an Interrupt Status Register
and an Options Register. These registers are enabled when the SPAD jumper (J6) is
removed (factory default). They replace the UART Scratchpad Register on accesses to
register address 7.

The Interrupt Status Register and Options Register are accessed through the
scratchpad location of any UART. The DLAB bit of the UART (Line Control Register,
bit 7) is used to select between the two registers. The most recent write of a DLAB bit
in any UART selects between the two registers as shown in Figure 6.

SPAD JumperDLAB Bit

Figure 7 --- DLAB bit selects between special registers

Register selected for

address 7 accesses

Interrupt Status Registerremoved0

Options Registerremoved1

Scratchpad RegistersappliedX

4.3 Interrupt Status Register

The read-only Interrupt Status Register can be used to quickly identify which
serial ports require servicing after an interrupt. Reading the Interrupt Status Register will
return the interrupt status of the entire DSCLP-100, as shown in Figure 7. The
individual bits are cleared as the interrupting ports are serviced. The interrupt service
routine should ensure that the interrupt status register reads zero before exiting.

DescriptionBit

0 (not used)7 (MSB)
0 (not used)6
0 (not used)5

0 (not used)4
Port 4 --- 1 if interrupt pending3
Port 3 --- 1 if interrupt pending2
Port 2 --- 1 if interrupt pending1
Port 1 --- 1 if interrupt pending0

Figure 8 --- Interrupt Status Register

DSCLP/SSCLP-100 User's Manual 7

4.4 Options Register

The Options Register allows software to identify the DSCLP-100 as a Quatech
Enhanced Serial Adapter. It also allows software to set the UART clock rate multiplier.
Figure 8 shows the structure of the Options Register.

The powerup default of the Options Register is all bits zero.

DescriptionNameBit

ID bit 1ID17 (MSB)

ID bit 0ID06
(reserved, 0)-5
(reserved, 0)-4
(reserved, 0)-3
(reserved, 0)-2

Clock rate multiplier bit 1RR11
Clock rate multiplier bit 0RR00

Figure 9--- Options Register bit definitions

4.4.1 Enhanced Serial Adapter Identification

The ID bits are used to identify the DSCLP-100 as a Quatech Enhanced Serial
Adapter. Logic operations are performed such that the values read back from these
bits will not necessarily be the values that were written to them. Bit ID1 will return the
logical-AND of the values written to ID[1:0], while bit ID0 will return their
exclusive-OR.

Software can thus identify a Quatech Enhanced Serial Adapter by writing the
ID bits with the patterns shown in the "write" column of Figure 9, then reading the bits
and comparing the result with the patterns in the "read" column. Matching read patterns
verify the presence of the Options Register.

ReadWrite

ID0ID1ID0ID1

0000
1010
1001
0111

Figure 10 --- ID bit write/read table

8 DSCLP/SSCLP-100 User's Manual

4.4.2 Clock Rate Multiplier

A standard RS-232 serial port operates at a clock speed of 1.8432 MHz. In
order to achieve higher data rates, Quatech Enhanced Serial Adapters can operate at
two times, four times or even eight times this standard clock speed. This is controlled
by the clock rate multiplier bits in the Options Register.

Software can determine the UART clock frequency by reading the clock rate
multiplier bits RR1 and RR0 in the Options Register as shown in Figure 10. RR1 and
RR0 can be set by writing to the Options Register if the X2 and X4 jumpers (J4-J5) are
all removed. This card has the 16550 UART. If one of these jumpers is applied, the
RR1 and RR0 bits are forced to the appropriate value. Reading the Options Register
will always return the clock rate multiplier at which the board is operating.

RR0RR1

At powerup and reset, the Options Register is initialized to 0. The DSCLP-100
will thus powerup in the x1 mode with software control of the clock rate multiplier
enabled as long as the X2, X4, and X8 jumpers are not installed.

Software can control high baud rates through a combination of changing the
clock rate multiplier and the UART baud rate divisor. For example, a baud rate of

230.4 kbps could be achieved by setting the clock rate multiplier to X2 mode (or by
applying the X2 jumper) and setting a software application for 115.2 kbps.

Clock Rate

Multiplier

00

X1

(default)

Figure 11 --- Rate Register bit definition

UART Clock

Frequency

Maximum Data

Rate

115.2 kbaud1.8432 MHz

230.4 kbaud3.6864 MHzX210

460.8 kbaud *7.3728 MHzX401

921.6 kbaud *14.7456 MHzX811

* 16750 UART only

DSCLP/SSCLP-100 User's Manual 9

5 Windows Configurations

5.1 Windows Mille nnium

1. After inserting the DSCLP-100 for the first time the "Add New Hardware
Wizard" will begin. Select "Search for the best driver for your device.". Check the
"Removable media" and "Specify location" box. Click the "Next" button.

3. Window will locate the proper INF file and copy the file from the CD. Click
the "Next" button.

4. The final dialog screen will verify the file copy from the CD. Click the
"Finish" button.

10 DSCLP/SSCLP-100 User's Manual

5.2 Windows 2000

1. After inserting a DSCLP-100 for the first time, the "Add New Hardware
Wizard will appear at start up. Click the "OK" button.

2. The following dialog box insert the Quatech COM CD (shipped with the
device).

Click the "OK" button.

4. The following dialog box will display the appropriate INF file on the CD in
drive. Click the "OK" button.

5. Window will copy the INF file from the CD and display a final dialog
indication that the process is complete. Click the "Finish" button.

DSCLP/SSCLP-100 User's Manual 11

5.3 Windows 98

1. After inserting a DSCLP-100 for the first time, the "Add New Hardware
Wizard will appear at start up. Cl ick the "Next" button.

2. Select "Search for the best driver for you device". Click the "Next" button.

3. On the next dialog, select the "CD-ROM DRIVE" check box. Insert the
Quatech

COM CD (shipped with the device) into the CD-ROM drive.
Click the "Next" button.

12 DSCLP/SSCLP-100 User's Manual

4. The following dialog box will display the appropriate INF file on the diskette in
drive. Click the "Next" button.

5. Window will copy the INF file from the diskette and display a final dialog
indication that the process is complete. Click the "Finish" button.
Windows 95 maintains a registry of all known hardware installed in your

computer. Inside this hardware registry Windows 95 keeps track of all of your system
resources, such as I/O locations, IRQ levels, and DMA channels. The "Add New
Hardware Wizard" utility in Windows 95 was designed to add new hardware and
update this registry.

An "INF" configuration file is included with the DSCLP-100 to allow easy

configuration in the Windows 95 environment.

5.4 Windows 95

5.5 Using the "New Hardware Found" Wizard

The following instructions provide step-by-step instructions on installing the

DSCLP-100 in Windows 95 using the "New Hardware Found" wizard.

1. After booting the computer with a newly-installed DSCLP-100, the "New
Hardware Found" dialog box will appear. If you have never installed a Quatech
PCI communications adapter before, the dialog box may simply indicate that it
has found a "PCI Card."

DSCLP/SSCLP-100 User's Manual 13

2. Select the radio button for "Driver from disk provided by hardware
manufacturer." Click the "OK" button to continue.

3. An "Install From Disk" dialog box should pop up. Insert the diskette with the
Quatech INF files on it, select the correct drive letter, and click the "OK"
button. Windows 95 automatically browses the root directory for an INF file
that defines configurations for Multi-function Adapters. If no INF files are
found, click the "Browse" button and search the Win95 sub directory on the
installation diskette. You are not required to select the file name. After finding
the directory containing the INF files, Windows 95 will choose the correct file.

4. The "New Hardware Found" dialog box will appear again, this time for an
"Unknown Device."

5. Again select the radio button for "Driver from disk provided by hardware
manufacturer." Click the "OK" button to continue.

6. Another "Install From Disk" dialog box will pop up. The path should already be
pointing to the Quatech diskette. Click the "OK" button to continue.

7. You should now see the "Copying Files" dialog box as Windows 95 copies the
driver files from the diskette.

8. The installation utility will ask for your Windows 95 installation disks. Serial
communication ports require two drivers supplied by Microsoft to function:
SERIAL.VXD and SERIALUI.DLL. Insert the disk or CD and click "OK".

NOTE:

You may be able to skip this step if you are certain that your system has the

latest version of these files installed. If you do not have your Windows 95 install

disks immediately available, click "OK" anyway. A dialog box appears with an

option to Skip the files. Click the Skip button and the files will not be installed.

This is all right if the latest version of these drivers are currently in the

\WINDOWS\SYSTEM directory.

9. The "New Hardware Found" dialog will repeat for each of the serial ports on
the DSCLP-100 as each port is registered with Windows 95.

10. Installation is complete.

5.6 Viewing Resources with Device Manager

14 DSCLP/SSCLP-100 User's Manual

The following instructions provide step-by-step instructions on viewing
resources used by the DSCLP-100 in Windows 95 using the "Device Manager" utility.
Select Start|Help from within Windows 95 for additional information on this utility.

1. Double click the "System" icon inside the Control Panel folder. This opens up
the System Properties box.

2. Click the "Device Manager" tab located along the top of the System Properties
box. This lists all hardware devices registered inside the Windows 95 registry.
Additional information is available on any of these devices by click on the
device name and then selecting the "Properties" button.

3. Double click the device group "Multi-function Adapters". The DSCLP-100
model name should appear in the list of Multi-function adapters.

4. Double click the DSCLP-100 model name and a properties box should open
for the hardware adapter.

5. Click the "Resources" tab located along the top of the properties box to view
the resources Windows 95 has allocated for the DSCLP-100 match the
hardware configuration. Because PCI is a true plug-and-play bus, do not
attempt to modify the configuration values listed. Click "Cancel" to exit
without making changes.

DSCLP/SSCLP-100 User's Manual 15

Figure 13--- Windows 95 Device Manager

6. The DSCLP-100 serial ports are also listed under the group Ports (COM and
LPT). Windows 95 does not assign COM1-COM4 to ports addressed at
nonstandard locations. The DSCLP-100 ports will be enumerated starting with
COM5 (or higher) even if lower logical numbers are available.

7. Select any of the Quatech Serial Ports listed under the group Port (COM and
LPT) and click the "Properties" button. This action opens a properties dialog
for the specific COM port on the DSCLP-100.

8. Click the "Port Settings" tab and then click the "Advanced" button. The
DSCLP-100 driver will display a custom Advanced Port Settings control,
which allows the ports UART compatibility mode and FIFO threshold levels to
be configured. The threshold values of full-scale for the transmit buffer and
3/4-scale for the receive buffer shown below are optimal for most applications.
Note that the FIFO option for each of the DSCLP-100's two ports is
configured independently.

16 DSCLP/SSCLP-100 User's Manual

Figure 14 --- Windows 95 Device Manager

9. Use the Logical COM Port names to access the serial ports on your
DSCLP-100 through your software applications. Note: The Logical COM
Port name is assigned to your ports by Windows 95. This name is required by
a Windows 95 application when accessing a particular p

DSCLP/SSCLP-100 User's Manual 17

6 Other Operating Systems

Device drivers for Windows NT and OS/2 are also available for the
DSCLP-100. The board can be used under DOS and other operating systems as well
in many circumstances. The software described below can be downloaded from the
Quatech web site if it did not come with the board.

6.1 Windows NT

The Windows NT device driver is installed by running the SETUP program.
Up to 256 serial ports are supported. There is a command line-based configuration
utility which is used for adding PCI bus and ISA bus serial ports. Please refer to the
documentation included with the device driver for full installation and configuration
details.

6.2 OS/2

The OS/2 device driver supports up to 32 serial ports in a system. Installation
is a manual, but simple, process. Please refer to the documentation included with the
device driver for full installation and configuration details.

6.3 DOS and other operating systems

The DSCLP-100 is not a direct drop-in replacement for a legacy serial port
because its base address and IRQ cannot be fixed at values such as 3F8 hex, IRQ 4
(COM1) or 2F8 hex, IRQ 3 (COM2), etc. Rather, the system BIOS assigns the
address and the IRQ in a plug-and-play fashion at boot time. Software which is to use
the DSCLP-100 must be able to accommodate any valid assignments of these
resources.

For Windows 95/98/2000/ME , Windows NT and OS/2, the Quatech device
drivers determine what the resource assignments are and proceed accordingly. In other
cases, however, the user must intervene. The discussion below will center on DOS, but
the concepts can be applied to other operating systems as well.

Many DOS applications support user configuration of the base address and
IRQ of a serial port. Such applications can generally make use of the DSCLP-100.
Older applications, as well as some custom software, may use hard-coded standard
legacy serial port addresses. These applications will require modifications if they are to
use the DSCLP-100.

Custom applications for which the customer has source code can be modified
to make just a few PCI BIOS function calls to obtain all the necessary configuration
information. The PCI BIOS specification can be obtained from the PCI Special
Interest Group. Contact Quatech technical support for more information.

6.3.1 QTPCI.EXE

18 DSCLP/SSCLP-100 User's Manual

Quatech's "QTPCI" utility supplies the information required when modifying the
serial port settings of the application. This program should be run from real DOS, not in
a Windows DOS box.

Figure 13 shows the Basic Mode display for the DSCLP-100 after the "Q" key
has been pressed. In this example, the DSCLP-100 uses I/O base address FF80 hex
and IRQ 11. The hardware revision of the DSCLP-100 is also displayed. Pressing the
"N" key will show similar information for all non-Quatech PCI devices in the system,
including those devices integrated on the motherboard.

The QTPCI program is capable only of displaying the PCI configuration. It

cannot be used to make changes.

Figure 14 --- QTPCI.EXE Basic Mode display

Figure 14 shows the Expert Mode display for the DSCLP-100 after the "Q"
key has been pressed. The information from the Basic Mode display is presented along

DSCLP/SSCLP-100 User's Manual 19

with more details such as the Vendor and Device IDs, PCI Class Code, size of memory
and I/O regions, etc. Pressing the "N" key will show similar information for all
non-Quatech PCI devices in the system, including those devices integrated on the
motherboard. In this example, the "Base addr 0" resource is reserved.

For users interested in even more details, PCI BIOS information can be
displayed by pressing the "B" key. Pressing the "I" key displays the PCI interrupt
routing table.

Figure 15 --- QTPCI.EXE Expert Mode display

20 DSCLP/SSCLP-100 User's Manual

7 External Connections

RS-232-C devices are classified by their function as either Data Terminal
Equipment (DTE) or Data Communication Equipment (DCE). Generally, data terminal
equipment is defined as the communication source and data communication equipment
is defined as the device that provides a communication channel between two DTE-type
devices.

Terminal

DTE

Terminal

DTE

RS-232-C

RS-232-C

Modem

DCE

Telephone

line

Modem

DCE

Figure 16 --- Use of DTEs and DCEs in a communications link

DTE- and DCE-type devices have complementary pinouts to allow terminals
and modems to be connected directly using a one-to-one cable as shown in Figure 16.
In many applications, DCEs are unnecessary, and in these cases a cable called a "null
modem cable" or "modem eliminator cable" is used to directly connect two DTE-type
devices. A typical null modem cable is also shown in Figure 16.

(3)

(3)

RxD

RxD

(2)

(2)

TxD

TxD
RTS

(4)

RTS

(4)
(5)

(5)

CTS

CTS

(20)

(20)

DTR

DTR

(6)

(6)

DSR

DSR

(8)

(8)

DCD

DCD

(22)

RI

(22)

(7)

(7)

GND

GND

Typical DTE-to-DCE cable

TxD
RxD
CTS
RTS
DSR
DTR
DCD

DCD
RI

RI
GND

GND

(3)
(2)
(4)
(5)
(20)
(6)
(8)

(8)
(22)

(22)
(7)

(7)

RxD

(3)
(2)

TxD

(4)

RTS
CTS

(5)

DTR

(20)

(6)

DSR

(8)

DCD

RI

(22)

(7)

GND

Typical DTE-to-DTE null modem cable

RxD
TxD
RTS
CTS
DTR
DSR

DCD
RI
GND

(3)
(2)
(4)
(5)

(20)

(6)
(8)
(22)
(7)

Figure 17 --- Cabling requirements for RS-232-C devices

(cables using 25-pin connectors shown)

DSCLP/SSCLP-100 User's Manual 21

The DSCLP-100 is a DTE device which connects to peripheral equipment
through a single male D-25 connector, or using the adapter cable, two male D-9
connectors. The standard serial port connections are listed in Figure 17.

RS-232

Signal

Figure 18 --- DSCLP-100 connector pinouts

Port 2Port 1

D-9D-25D-9D-25

3932TxD
21023RxD
71174RTS
81285CTS
419420DTR
61366DSR
12518DCD
923922RI
5157GND

22 DSCLP/SSCLP-100 User's Manual

8 PCI Resource Map

Listed below are the PCI resources used by the DSCLP-100. Such

information may be of use to customers writing their own device drivers or other custom
software. A detailed description of the DSCLP-100's UARTs is available on the
Quatech web site.

(all numbers in hex)

PCI Vendor ID: 0x135C Quatech, Inc.

PCI Device ID:0x0180DSCLP-100
PCI Device ID:0x0190SSCLP-100

PCI Class Code

Base class: 0x07 Simple communications controller
Subclass: 0x02 Multiport serial controller
Interface: 0x00

IRQ sourced by: INTA#

Base address 0: 0x80 bytes Mem Reserved region

Base address 1: 0x80 bytes I/O Reserved region

Base address 2: 0x10 bytes I/O Serial ports(DSCLP-100)

Port 1 at offset 0x00
Port 2 at offset 0x08(DSCLP-100)

DSCLP/SSCLP-100 User's Manual 23

9 Specifications

Bus interface: PCI, 32-bit bus, 5-volt only

Dimensions: approx. 5.0" x 3.7"

Serial ports

Controller: 16550 with 16-byte FIFOs

Interface: One male D-25 connector

Transceivers: ICL3245CA

High-level output: +5V min
Low-level output: -5V max,
Switching speed

IBM-compatible computers

Two male D-9 connectors

using adapter cable

Power requirements

+3.3 volts: approx. 250 mA
+/-12 volts: approx. 35 mA

Temperature: operating 0° to 70°

storage -50° to 80°

Humidity: 10% to 90%

24 DSCLP/SSCLP-100 User's Manual

Maximum Load (pF)

Data Rate

(kbaud)

Note 1: The signal transition time ratio is defined as the percentage of the unit
interval or bit time (the inverse of the data rate) that is occupied by the signal
transition ing from -3V to +3V. The EIA/TIA-232-E standard defines a
maximum signal transition time ratio of 4%; most RS-232 receivers will
recognize signal transitions with much larger ratios. With a 4% signal transition
time ratio, EIA/TIA-232-E is limited to a theoretical data rate of 200 kbaud. If
maximum signal transition time ratio is extended to 10%, 15%, 20%, or even
25%, the maximum data rate achievable using EIA/TIA-232-E can be
increased past 200 kbaud.

Note 2: A typical value for capacitance per foot of standard cable is 50 pF/ft.

4%

trans

time

10%

trans

time

15%
trans

time

20%
trans

time

25%
trans

time
470430300100N/A921.6

1100900670430100460.8

200016301100900330230.4

4800430033001570800115.2

DSCLP/SSCLP-100 User's Manual 25

10 Troubleshooting

Listed here are some common problems and frequent causes of those
problems. If the information here does not provide a solution, contact Quatech
technical support.

Any unauthorized repairs or modifications will void the DSCLP-100's warranty.

Computer will not boot up.

1. Is the DSCLP-100 properly inserted? Remove the card and try again.
Perhaps try a different expansion slot.

2. Ensure that an ISA-bus card is not using the same IRQ that the PCI BIOS tries
to assign to the DSCLP-100. Most computers have BIOS setup options to
reserve IRQs for either ISA or PCI use. Try reserving the IRQ for the ISA
card. The BIOS will automatically choose a different IRQ for the DSCLP-100.
An address conflict is unlikely because most PCI-based computers will assign
I/O addresses in such a way that they cannot conflict with ISA-bus devices.

3. The DSCLP-100 may be defective. Contact technical support for instructions.

Cannot communicate with other equipment.

1. Are the cable connections correct? Are the cables securely attached?

2. Is the software configured with the correct base address and IRQ information
for the DSCLP-100? (This is mainly a DOS issue.)

3. Is the device driver installed?

4. If you are trying to communicate with another DTE, a null-modem cable will be
required.

5. If possible, use a loopback connector to test the port. This connector needs to
connect the following sets of signals on a D-9 connector:

TxD and RxD (pins 2 and 3)
RTS and CTS (pins 7 and 8)
DCD, DTR, DSR, and RI (pins 1, 4, 6 and 9)

26 DSCLP/SSCLP-100 User's Manual

SSCLP/DSCLP-100
User's Manual
Revision 1.00
January 2002
P/N: 940-0179-100