Omega Products DSP-200 Installation Manual

Table of Contents

7-1

7 . Specifications

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6-1

6 . External Connections

6-6

5.6 PCMCIA Configuration Register

5-5

5.5 Half Duplex Operation

5-4

5.4 Termination Resistors

5-3

5.3.2 Auxiliary Channel: Handshaking Disabled.

5-2

5.3.1 Auxiliary Channel: RTS-CTS Handshaking.

5-2

5.3 Auxiliary Channel Configuration

5-1

5.2 Scratchpad Register

5-1

5.1 I/O Addressing Modes

5-1

5 . Hardware Information

5-6

4.2 Monitoring The Status Of PCMCIA Cards

5-6

4.1.6 Applying Options to All The DSP-200/300 Cards

4-5

4.1.5 Using Multiple Options

4-5

4.1.4 Options

4-4

4.1.3 Advanced Configuration Topics

4-3

4.1.2 Configuring With "User Assigned" Resources

4-2

4.1.1 Configuring With "System Assigned" Resources

4-2

4.1 Command Line Options

4-1

4 . OS/2 Installation

3-4

3.2.2 Changing Resource Settings with Device Manager

3-3

3.2.1 Viewing Resource Settings with Device Manager

3-2

3.2 DSP-200/300 Resource Settings in Windows 95

3-1

3.1 Installing a DSP-200/300 Under Windows 95.

3-1

3 . Windows 95 Installation

2-14

2.2.2 Common Problems

2-10

2.2.1 Command Line Options

2-9

2.2 DSP-200/300 Enabler for DOS

2-8

2.1.3 Common Problems

2-3

2.1.2 Command Line Options

2-2

2.1.1 Client Driver Installation

2-2

2.1 DSP-200/300 Client Driver for DOS

2-1

2 . DOS / Windows 3.x Installation

1-1

1 . Introduction

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DSP-200/300 User's Manual iii

List of Figures

6-1

Figure 16. D-9 Female Signal Assignment.

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6-1

Figure 15. DSP-200/300 Adapter Cable.

6-6

Figure 14. PCMCIA Configuration Options Register

5-5

Figure 13. RS-422/485 Driver Enable Options

5-4

Figure 12. RS-422/485 Termination

5-3

Figure 11. Auxiliary Channel Handshaking Disabled

5-2

Figure 10. Auxiliary Channel RTS-CTS Handshaking.

5-1

Figure 9. Interrupt Status Register.

5-1

Figure 8. Block Mode Addressing.

5-6

Figure 7. OS/2 Plug and Play GUI

3-7

Figure 6. Windows 95 Resource Allocation

3-6

Figure 5. DSP-200/300 Basic Configuration Table.

3-4

Figure 4. Windows 95 Device Manager

2-11

Figure 3. DOS Enabler Output Enable Options.

2-4

Figure 2. DOS Client Output Enable Options.

2-1

Figure 1. Client Driver versus Enabler for DOS/Windows 3.x.

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iii

1. Introduction

The DSP-200/300 provides two independent RS-422/RS-485
asynchronous serial communications interfaces for systems equipped
with PCMCIA Type II and/or Type III expansion sockets. The
DSP-200/300 is a PCMCIA Type II (5 mm) card and is PCMCIA PC Card
Standard Specification 2.1 compliant.

The DSP-200/300's serial ports are implemented using 16C550 Universal
Asynchronous Receiver/Transmitters (UARTs) which are the
recommended communications interface for multitasking environments
and with applications involving high data transfer rates.

The RS-422/485 serial ports may be configured to operate in either the
Full Duplex or Half Duplex mode; RTS or DTR may be used to enable the
output drivers, or the RS-422/485 serial ports may be configured so that
the output drivers are always enabled. Another option provided in the
RS-422/485 serial ports is an RTS-CTS modem control handshake. This
handshake may be enabled or disabled when the DSP-200/300 is
configured.

The DSP-200/300's two serial ports are addressable in two modes:

1. 'Block Mode': The two serial ports are configured in one
16-byte continuous block of I/O address space. The block must
begin on an even 16-byte division. Both serial ports share one
IRQ level.

2. 'COM Mode': The two serial ports are configured at the
standard COM port I/O address locations. The ports may be
configured as COM1 and COM3; also, the ports may be
configured as COM2 and COM4. Both serial ports share one
IRQ level.

A special interrupt status register is also available to simplify the software
required to service multiple serial ports in an interrupt driven
environments. See the Hardware Information section for details on these
topics.

DSP-200/300 User's Manual 1-1

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1-2

2. DOS / Windows 3.x Installation

Socket Services software

Services software (not from Omega)

Swapping)

host adapters

host adapter independent)

File type: DOS executable

File type: DOS device driver

File name: DSP200EN.EXE

File name: DSP200CL.SYS

Enabler (not recommended)

Client Driver (recommended)

Two configuration software programs are provided with the
DSP-200/300: a Client Driver, DSP200CL.SYS, and a card Enabler,
DSP200EN.EXE. Both of these programs are executed from DOS (before
entering Windows) and allow operation of the DSP-200/300 in both the
DOS and Windows 3.x environments. For optimal operation, however,
the Client Driver is the preferred method of installation and
configuration. The table below highlights the differences between these
programs.

Interfaces to PCMCIA Card and
Socket Services software (PCMCIA

Allows automatic configuration of
DSP-200/300 adapters upon insertion
(Hot Swapping)

Requires PCMCIA Card and Socket

Interfaces directly to Intel 82365SL
and other PCIC compatible PCMCIA

Does not support automatic
configuration of DSP-200/300
adapters upon insertion (Hot

Does not require PCMCIA Card and

Figure 1. Client Driver versus Enabler for DOS/Windows 3.x.

Card and Socket Services software is commercially available from several
vendors for most desktop and laptop PCs. If you are unsure whether
Card and Socket Services software is currently installed on your system,
install the DSP-200/300 Client Driver as discussed in following section.
When loaded, the Client Driver will display an error message if Card and
Socket Services software is not detected.

DSP-200/300 User’s Manual 2-1

2.1 DSP-200/300 Client Driver for DOS

version of Card and Socket Services may be required.

In order to use the DSP-200/300 Client Driver, the system must be
configured with Card and Socket Services software. Card and Socket
Services software is not provided with the DSP-200/300 but is not available
from Omega.

IMPORTANT:

Some versions of Card and Socket Services dated before
1993 do not support general purpose I/O cards. If after
careful installation of the Client Driver the DSP-200/300
does not configure or operate properly, an updated

2.1.1 Client Driver Installation

The following procedure is used to install the DSP-200/300 Client Driver:

1. Copy the file DSP200CL.SYS from the DSP-200/300 distribution
diskette onto the system's hard drive.

2. Using an ASCII text editor, open the system's CONFIG.SYS file
located in the root directory of the boot drive.

3. Locate the line(s) in the CONFIG.SYS file where the Card and
Socket Services software is installed.

4. AFTER
software, add the following line to the CONFIG.SYS file:

DEVICE = drive:\path\DSP200CL.SYS options

where options are the DSP-200/300 Client Driver command line
options discussed on the following pages.

5. Save the CONFIG.SYS file and exit the text editor.

6. Insert the DSP-200/300 into one of the system's PCMCIA slots.
NOTE: Since the DSP-200/300 Client Driver supports "Hot

Swapping", it is not necessary to have the DSP-200/300 installed
when booting the system. By inserting the card before booting,
however, the Client Driver will report the adapter configuration
during the boot process thereby verifying the changes made to the
CONFIG.SYS.

the line(s) installing the Card and Socket Services

2-2

7. Reboot the system and note the message displayed when the
DSP-200/300 Client Driver is loaded. If the Client Driver
reports an "invalid command line option", correct the entry in
the CONFIG.SYS file and reboot the system again. If the Client
Driver reports "Card and Socket Services not found", a version
of Card and Socket Services must be installed on the system or
the DSP-200/300 Enabler program must be used to configure
the adapter. If the Client Driver reports the desired adapter
configuration, the installation process is complete and the
DSP-200/300 may be removed and / or inserted from the
system as desired. On each insertion into the PCMCIA socket,
the DSP-200/300 will be automatically reconfigured according
to the command line options.

2.1.2 Command Line Options

The DSP-200/300 Client Driver accepts up to eight command line
arguments from the user to determine the configuration of the
DSP-200/300. If any arguments are provided, the Client Driver will
attempt to configure any DSP-200/300s with the options specified in the
order they are entered on the command line. Each argument must be
enclosed in parenthesis and must be separated from other arguments by a

on the command line. Within each argument, any or all of the

space

following parameters may be specified using a comma
separate each parameter:

(no spaces) to

Baddress specifies a “block mode” base I/O address of the DSP-200/300

in hexadecimal. This address must reside on an even 16-byte
(10H) boundary. This option must
Dmode option. If both the Dmode and Baddress options are
omitted, a “block mode” base address will be assigned by
Card and Socket Services.

Dmode specifies a “COM” mode” base I/O address configuration for

the DSP-200/300. The D1 option configures the DSP-200/300
at COM1/COM3 (3F8 / 3E8), and the D2 option configures the
DSP-200/300 at COM2/COM4 (2F8 / 2E8). This option must
be omitted if using the Baddress option. If both the Dmode and
Baddress options are omitted, a “block mode” base address will
be assigned by Card and Socket Services.

DSP-200/300 User’s Manual 2-3

be omitted if using the

Iirq specifies the interrupt level (IRQ) of the DSP-200/300 in

DTR Controlled

DTR Controlled

o4

RTS Controlled

RTS Controlled

o3

Always Enabled

DTR Controlled

o2

Always Enabled

RTS Controlled

o1

Always Enabled

Always Enabled

o0

Port B Output Driver

Port A Output Driver

Option

Hardware Information section for more information.

decimal. irq must be one of the following values: 3, 4, 5, 7, 9,
10, 11, 12, 14, 15, or 0 if no IRQ is desired. If this option is
omitted, an interrupt level will be assigned by Card and Socket
Services.

Ssocket specifies which PCMCIA socket the DSP-200/300 must be

inserted into for this configuration argument to be used. socket
must be in the range 0 - 15. If this option is omitted, the
configuration argument will apply to DSP-200/300s inserted
into any socket.

Odriver specifies RS-422/485 output driver enable option for the

DSP-200/300 ports. The DSP-200/300’s ports may be
configured for either full duplex or half duplex operation with
this option. If this option is omitted, the default setting is the
RS-422/485 ports are configured for full duplex operation with
the RS-422/485 output drivers always enabled. In half duplex
mode, the RS-422/485 transmitter may be enabled and
disabled via the RTS (request to send) or DTR (data terminal
ready) signals. Both RTS and DTR are controlled through the
Modem Control Register of the 16550. See the Hardware
Information section for more information.

H instructs the client driver to enable the RTS-CTS modem

2-4

Figure 2. DOS Client Output Enable Options.

control handshake for both Port A and Port B. When modem
control handshaking in enabled, the 16C550 UART’s RTS and
CTS signals are connected to the RS-422/485 auxiliary channel.
The auxiliary channel may then be used for handshaking
between a DSP-200/300 RS-422/485 port and a peripheral
device. When modem control handshaking is disabled, the
RTS and CTS signals from the 16C550 UART are looped back
to each other. Port A and Port B must both be configured in
the same manner. If this option is omitted, the default setting
is RTS-CTS modem control handshake disabled. See the

U instructs the Client Driver to disable the DSP-200/300's

interrupt status register and enable the Scratchpad registers of
the individual UARTs. This option is only required in very
rare cases where an application program requires access to the
UART's Scratchpad register. If this option is omitted, the
DSP-200/300's interrupt status register is enabled and the
UARTs' Scratchpad registers are disabled.

.1.2.1 Example 1

2

DEVICE = C:\DSP-200\DSP200CL.SYS

In example 1, no command line arguments are specified. The Client
Driver will configure a DSP-200/300 inserted into any socket in “block
mode” with a base address and IRQ assigned by Card and Socket
Services. The DSP-200/300's interrupt status register will be enabled, the
RS-422/485 output drivers for both ports will always be enabled, and
RTS-CTS modem control handshaking will be disabled.

.1.2.2 Example 2

2

DEVICE = C:\DSP-200\DSP200CL.SYS (d1)

In example 2, a single command line argument is provided. The Client
Driver will attempt to configure a DSP-200/300 inserted into any socket in
“COM mode” at COM1/COM3 and an IRQ assigned by Card and Socket
Services. If address COM1 (3F8) or COM3 (3E8) are unavailable, the
DSP-200/300 will not be configured. If the Client Driver can successfully
configure the DSP-200/300, its interrupt status register will be enabled,
the RS-422/485 output drivers for both ports will always be enabled, and
RTS-CTS modem control handshaking will be disabled.

DSP-200/300 User’s Manual 2-5

2.1.2.3 Example 3

DEVICE = C:\DSP-200 \DSP200CL.SYS (s0,b300,i5,o2)

In example 3, a single command line argument is provided. The Client
Driver will attempt to configure a DSP-200/300 inserted into socket 0
with a base address of 300H and IRQ 5. If address 300H or IRQ 5 is
unavailable, the DSP-200/300 will not be configured. In addition, if a
DSP-200/300 is inserted into any other socket, it will not be configured. If
the Client Driver can successfully configure the DSP-200/300, its interrupt
status register will be enabled, the port A RS-422/485 output drivers will
be enabled and disabled via the DTR signal, the port B RS-422/485 output
drivers will always be enabled, and RTS-CTS modem control
handshaking will be disabled.

.1.2.4 Example 4

2

DEVICE = C:\DSP-200 \DSP200CL.SYS (i5,h,u,b300)

In example 4, a single command line argument is provided. Because the
parameter order is not significant, the Client Driver will attempt to
configure a DSP-200/300 inserted into any socket with a base address of
300H and IRQ 5. If address 300H or IRQ 5 is unavailable, the
DSP-200/300 will not be configured. If the Client Driver can successfully
configure the DSP-200/300, its interrupt status register will be disabled
(Scratchpad registers enabled), the RS-422/485 output drivers for both
ports will always be enabled, and RTS-CTS modem control handshaking
will be enabled on each ports auxiliary channel.

.1.2.5 Example 5

2

DEVICE = C:\DSP-200 \DSP200CL.SYS (b300,i5) (i10) ( )

In example 5, three command line arguments are provided. The Client
Driver will first attempt to configure a DSP-200/300 inserted into any
socket with a base address of 300H and IRQ 5. If address 300H or IRQ 5
is unavailable, the Client Driver will proceed to the second command line
argument and attempt to configure the card with a base address assigned
by Card and Socket Services and IRQ 10. If IRQ 10 is also unavailable, the
Client Driver will proceed to the third command line argument and
attempt to configure the DSP-200/300 with a base address and

an IRQ

assigned by Card and Socket Services. If the Client Driver can

2-6

successfully configure the DSP-200/300, its interrupt status register will
be enabled, the RS-422/485 output drivers for both ports will always be
enabled, and RTS-CTS modem control handshaking will be disabled.

.1.2.6 Example 6

2

DEVICE = C:\DSP-200 \DSP200CL.SYS (b300,i5) ( ) (i10)

In example 6, the three command line arguments of example 5 have been
rearranged. The Client Driver will first attempt to configure a
DSP-200/300 inserted into any socket with a base address of 300H and
IRQ 5. If address 300H or IRQ 5 is unavailable, the Client Driver will
proceed to the second command line argument and attempt to configure
the card with a base address and IRQ assigned by Card and Socket
Services. Since the second command line argument includes all available
address and IRQ resources, the third command line argument will never
be reached by the Client Driver. It is the user's responsibility to place the
command line arguments in a logical order.

.1.2.7 Example 7

2

DEVICE = C:\DSP-200\DSP200CL.SYS (s0,b300,i5) (s1,b340,i10)

The type of configuration shown in example 7 may be desirable in
systems where more than one DSP-200/300 is to be installed. In this
example, the Client Driver will attempt to configure a DSP-200/300
inserted into socket 0 with a base address of 300H and IRQ 5. If the
DSP-200/300 is inserted into socket 1, the Client Driver will attempt to
configure it with base address 340H and IRQ 10. This allows the user to
force the DSP-200/300's address and IRQ settings to be socket specific
which may simplify cable connections and software development. As in
the previous examples, however, if the requested address or interrupt
resources are not available, the DSP-200/300 will not be configured.

DSP-200/300 User’s Manual 2-7

2.1.3 Common Problems

Generic Client Drivers:

Many Card and Socket Services packages include a generic client driver
(or SuperClient) which configures standard I/O devices. If one of these
generic client drivers is installed, it may configure the DSP-200/300
causing the DSP-200/300 client driver to fail installation. In these cases,
the user should do one of the following:

1. modify the operation of the generic client driver to disable the
configuration of modem/serial port cards. Consult the Card
and Socket Services documentation for availability and details
of this feature.

2. place the DSP-200/300 client driver before the generic client
driver in the CONFIG.SYS.

Available Resources:

One function of the Card and Socket Services software is to track which
system resources (memory addresses, I/O addresses, IRQs, etc.) are
available for assignment to inserted PCMCIA cards. Sometimes,
however, the Card Services software assumes or incorrectly determines
that a particular resource is used when it is actually available. Most Card
and Socket Services generate a resource table in a file (typically in the
form of an .INI file) which the user can modify to adjust the available
system resources. Consult the Card and Socket Services documentation
for availability and details of this feature.

Multiple Configuration Attempts:

Some Card and Socket Services have a setting which aborts the
configuration process after a single configuration failure (such as a
request for an unavailable resource). The user should change this setting
to allow for multiple configuration attempts. Consult the Card and Socket
Services documentation for availability and details of this feature.

Older Versions of Card and Socket Services:

Some versions of Card and Socket Services dated before 1993 do not
support general purpose I/O cards. If after careful installation of the
Client Driver the DSP-200/300 does not configure or operate properly, an
updated version of Card and Socket Services may be required. Card and
Socket Services software is not available from Omega.

2-8

2.2 DSP-200/300 Enabler for DOS

operation and with the device(s) it controls.

on how to exclude this memory region.

For systems that are not operating PCMCIA Card and Socket Services
software, the DSP-200/300 DOS Enabler may be used to enable and
configure the adapter. This Enabler, DSP200EN.EXE, will operate on any
DOS system using an Intel 82365SL or PCIC compatible PCMCIA host
adapter including the Cirrus Logic CL-PD6710 / 6720, the VLSI
VL82C146, and the Vadem VG-365 among others.

IMPORTANT:

In order to use the DSP-200/300 Enabler for DOS, the
system MUST NOT be configured with Card and Socket
Services software. If a Card and Socket Services software is
installed, the DSP-200/300 Enabler may interfere with its

The DSP-200/300 Enabler does not support automatic configuration of
adapters upon insertion, more commonly referred to as "Hot Swapping".
This means the adapter must be installed in one of the system's PCMCIA
sockets before executing DSP200EN.EXE. If more than one adapter is
installed in a system, the Enabler must be executed separately for each
adapter. Furthermore, DSP200EN.EXE should be executed to release the
resources used by the adapter before it is removed from the PCMCIA
socket. Since PCMCIA adapters do not retain their configuration after
removal, any adapter that is removed from the system must be
reconfigured with the Enabler after re-inserting it into a PCMCIA socket.

IMPORTANT:

The Enabler requires a region of high DOS memory when
configuring a DSP-200/300. This region is 1000H bytes (4KB)
long and by default begins at address D0000H (the default
address may be changed using the "W" option). If a memory
manager such as EMM386, QEMM, or 386Max is installed on
the system, this region of DOS memory must be excluded from
the memory manager's control. Consult the documentation
provided with the memory manager software for instructions

DSP-200/300 User’s Manual 2-9

2.2.1 Command Line Options

To configure a DSP-200/300 in the system, the Enabler requires one
command line argument from the user to determine the configuration of
the card. This argument must be enclosed in parenthesis and within the
argument, any or all of the following parameters may be specified using a

comma

Ssocket specifies which PCMCIA socket the DSP-200/300 must be

Baddress specifies a “block mode” base I/O address of the DSP-200/300

Dmode specifies a “COM” mode” base I/O address configuration for

(no spaces) to separate each parameter:

inserted into for this configuration argument to be used. socket
must be in the range 0 - 15. This option is always required.

in hexadecimal. This address must reside on an even 16-byte
(10H) boundary. Specify only one
options: Baddress, Dmode, or ‘R’. Use of one of theses options is

always

the DSP-200/300. The ‘D1’ option configures the DSP-200/300
at COM1/COM3 (3F8 / 3E8), and the ‘D2’ option configures
the DSP-200/300 at COM2/COM4 (2F8 / 2E8). Specify only

one

Use of one of theses options is always

required.

of the following three options: Baddress, Dmode, or ‘R’.

of the following three

required.

Iirq specifies the interrupt level (IRQ) of the DSP-200/300 in

decimal. irq must be one of the following values: 3, 4, 5, 7, 9,
10, 11, 12, 14, 15, or 0 if no IRQ is desired. This option is
required if the 'R' option is not used.

Waddress specifies the base address of the memory window required to

configure the DSP-200/300. Set address = D0 for a memory
window at segment D000, address = D8 for a memory window
at segment D800, etc. Valid settings for address are C8, CC, D0,
D4, D8, and DC. If this option is omitted, a memory window
at segment D000 will be used.

Odriver specifies RS-422/485 output driver enable option for the

DSP-200/300 ports. The DSP-200/300’s ports may be
configured for either full duplex or half duplex operation with
this option. If this option is omitted, the default setting is the
RS-422/485 ports are configured for full duplex operation with
the RS-422/485 output drivers always enabled. In half duplex
mode, the RS-422/485 transmitter may be enabled and

2-10

disabled via the RTS (request to send) or DTR (data terminal

DTR Controlled

DTR Controlled

o4

RTS Controlled

RTS Controlled

o3

Always Enabled

DTR Controlled

o2

Always Enabled

RTS Controlled

o1

Always Enabled

Always Enabled

o0

Port B Output Driver

Port A Output Driver

Option

ready) signals. Both RTS and DTR are controlled through the
Modem Control Register of the 16550. See the Hardware
Information section for more information.

Figure 3. DOS Enabler Output Enable Options.

H instructs the enabler to enable the RTS-CTS modem control

handshake for both Port A and Port B. When modem control
handshaking in enabled, the 16C550 UART’s RTS and CTS
signals are connected to the RS-422/485 auxiliary channel. The
auxiliary channel may then be used for handshaking between
a DSP-200/300 RS-422/485 port and a peripheral device.
When modem control handshaking is disabled, the RTS and
CTS signals from the 16C550 UART are looped back to each
other. Port A and Port B must both be configured in the same
manner. If this option is omitted, the default setting is
RTS-CTS modem control handshake disabled. See the
Hardware Information section for more information.

U instructs the Enabler to disable the DSP-200/300's interrupt

status register and enable the Scratchpad registers of the
individual UARTs. This option is only required in very rare
cases where an application program requires access to the
UART's Scratchpad register. If this option is omitted, the
DSP-200/300's interrupt status register is enabled and the
UARTs' Scratchpad registers are disabled.

Before removing a DSP-200/300 from its PCMCIA socket, the Enabler
should be executed to free the system resources allocated when the card
was installed. For this operation the Enabler provides on additional
command line option:

R instructs the enabler to release the resources previously

allocated to the DSP-200/300. When the 'R' option is used, any
settings specified by the 'B', 'I', 'U', and 'E' options are ignored.

DSP-200/300 User’s Manual 2-11

2.2.1.1 Example 1

DSP200EN.EXE

In example 1, no command line argument is specified. The Enabler will
report an error and display the proper usage of the command.

.2.1.2 Example 2

2

DSP200EN.EXE (s0,b300,i5)

In example 2, the Enabler will configure the DSP-200/300 in socket 0 with
a base address of 300H and IRQ 5 using a configuration memory window
at segment D000. The DSP-200/300's interrupt status register will be
enabled, the RS-422/485 output drivers for both ports will always be
enabled, and RTS-CTS modem control handshaking will be disabled.

.2.1.3 Example 3

2

DSP200EN.EXE (i10,h,u,b340,s1)

In example 3, the Enabler will configure the DSP-200/300 in socket 1 with
a base address of 340H and IRQ 10 using a configuration memory
window at segment D000. The DSP-200/300'S interrupt status register
will be disabled (Scratchpad registers enabled), the RS-422/485 output
drivers for both ports will always be enabled, and RTS-CTS modem
control handshaking will be enabled on each ports auxiliary channel.

.2.1.4 Example 4

2

DSP200EN.EXE (s0,b300,i3,wd8)

In example 4, the Enabler will configure the DSP-200/300 in socket 0 with
a base address of 300H and IRQ 3 using a configuration memory window
at segment D800. The DSP-200/300's interrupt status register will be
enabled, the RS-422/485 output drivers for both ports will always be
enabled, and RTS-CTS modem control handshaking will be disabled

2-12

2.2.1.5 Example 5

DSP200EN.EXE (o3,i5,b340,s1)

In example 2, the Enabler will configure the DSP-200/300 in socket 1 with
a base address of 340H and IRQ 5 using a configuration memory window
at segment D000. The DSP-200/300's interrupt status register will be
enabled, the RS-422/485 output drivers on both ports will be enabled and
disabled via the RTS signal , and RTS-CTS modem control handshaking
will be disabled.

.2.1.6 Example 6

2

DSP200EN.EXE (s0,b300,i5,r)

In example 6, the Enabler will release the configuration used by the
DSP-200/300 in socket 0 using a configuration memory window at
segment D000. The base address and IRQ parameters are ignored and
may be omitted.

.2.1.7 Example 7

2

DSP200EN.EXE (s1,r,wcc)

In example 7, the Enabler will release the configuration used by the
DSP-200/300 in socket 1 using a configuration memory window at
segment CC00.

DSP-200/300 User’s Manual 2-13

2.2.2 Common Problems

Memory Range Exclusion:

The Enabler requires a region of high DOS memory when configuring a
DSP-200/300. This region is 1000H bytes (4KB) long and by default
begins at address D0000H (the default address may be changed using the
"W" option). If a memory manager such as EMM386, QEMM, or 386Max
is installed on the system, this region of DOS memory must be excluded
from the memory manager's control. Consult the documentation
provided with the memory manager software for instructions on how to
exclude this memory region.

Furthermore, some systems use the high memory area for BIOS
shadowing to improve overall system performance. In order for the
Enabler to operate, any BIOS shadowing must be disabled in the address
range specified for the configuration window. BIOS shadowing can
usually be disabled through the system's CMOS setup utility.

Socket Numbers:

The Enabler requires the DSP-200/300'S socket number to be specified on
the command line and the DSP-200/300 must be inserted into the socket
before the Enabler is invoked. Some vendors number their sockets from 1
to N while other vendors number their sockets from 0 to N-1. For the
DSP-200/300 Enabler, the lowest socket number in the system is
designated socket 0.

Card and Socket Services Software:

In order to use the DSP-200/300 Enabler for DOS, the system MUST NOT
be configured with Card and Socket Services software. If a Card and
Socket Services software is installed, the DSP-200/300 Enabler may
interfere with its operation and with the device(s) it controls. For systems
configured with Card and Socket Services, the DSP-200/300 Client Driver
is the recommended method of configuration.

2-14

3. Windows 95 Installation

directory, those files will be used.

To allow easy configuration of the DSP-200/300, an Windows 95 "INF"
configuration file has been written for the hardware. This configuration
file supports the DSP-200/300 in both addressing modes: block mode and
“com” mode. Additionally, the RTS-CTS modem control handshake
option and the RS-422/485 output driver enable option for full and half
duplex operation is supported.

3.1 Installing a DSP-200/300 Under Windows 95.

1. Insert the DSP-200/300 into any available PC Card socket.

2. The first time a new PC Card type is installed the New
Hardware Found window opens. After this first installation
Windows 95 will automatically detect and configure the card.
If the New Hardware Found window does not open, then skip
to the next section, “DSP-200/300 Resource Settings".

3. The New Hardware Found window provides several options to
configure the DSP-200/300 card. Click the "Driver from Disk"
option button. Click "OK" to continue.

4. An "Install from Disk" dialog box should appear. Insert the
diskette with the "DSP2_300.INF" file, select the correct drive
letter and path, and click "OK". Windows 95 will browse the
path for the aforementioned files.

5. During the installation process, it may be required to supply the
computer with the Windows 95 CD or installation diskettes.
The DSP-200/300'S serial devices will require the file
"SERIALUI.DLL". Insert the CD or diskette and click "OK".

IMPORTANT NOTE:

If the user already has these files installed on the
computer, or if the installation disks are unavailable, it
may not be necessary to supply the computer with the
Windows 95 CD or installation diskettes. If prompted for
the disks, click “OK”. A dialog box with an option to skip
will appear. Click the “Skip” button and the files will not
be installed. If these files exist in the windows system

DSP-200/300 User's Manual 3-1

The DSP-200/300 PC Card should now be configured. The default
configuration for the DSP-200/300 is a base address and IRQ assigned by
Windows 95, the DSP-200/300's interrupt status register will be disabled,
the 16C550 UART’s scratchpad registers will be enabled, the RS-422/485
output drivers for both ports will always be enabled, and RTS-CTS
modem control handshaking will be disabled. In the future, Windows 95
will automatically recognize and configure the DSP-200/300 in this
default configuration.

3.2 DSP-200/300 Resource Settings in Windows 95

Windows 95 maintains a registry of all known hardware installed within
the computer. Inside this hardware registry Windows 95 keeps track of
all the computer's resources, such as base I/O addresses, IRQ levels, and
DMA channels. In the case of a PC Card (PCMCIA) type board,
Windows 95 configures the new hardware using free resources it finds
within the hardware registry, and updates the registry automatically.

To view and / or edit hardware devices in Windows 95 use the system
Device Manager. To access Device Manager double click the System icon
in the Windows 95 control panel, or click the My Computer icon on the
Win95 desktop with the right mouse button and select Properties from
the pull down menu. Consult Windows 95 on-line help for details on the
use of the Device Manager.

Windows 95 handles the DSP-200/300 as a "parent/child device".

v The DSP-200/300 is the "parent device" and is listed under the

hardware class Multi-function Adapters in the device manager.

v Each serial port is a "child device" of the "parent device"

DSP-200/300. There are 2 child COM ports for the DSP-200/300
which are listed under the hardware class Ports (Com & LPT).

3-2

3.2.1 Viewing Resource Settings with Device Manager

1. Start the Windows 95 Device Manager.

2. Double click on the hardware class Multi-function Adapters to
list hardware devices in the class.

3. The DSP-200/300 “parent device” belongs to this hardware
class. The device name for the DSP-200/300 is Omega
DSP-200/300: 2 RS-422/RS-485 Serial Ports (see Figure 4.
Windows 95 Device Manager).

4. Open the Properties dialog for the DSP-200/300 device, then
click the Resources tab to view the Input/Output Range and
Interrupt Request resource allocations. Examine and remember
the Input/Output Range, then close the properties window.

5. Double click the hardware class Ports (Com and LPT). Two of
the Logical COM Ports (COM2, COM4, etc.) listed in this class
are the “child devices” of the DSP-200/300 “parent device”.

6. View the Properties dialog for each COM port and examine the
Resources allocated to each port. Inside the Resource allocation
window two of the COM ports will identify the Omega
DSP-200/300: 2 RS-422/RS-485 Serial Ports as the parent
device. The Input/Output Range and Interrupt Request
resource allocations for these two COM ports will also match
the resource allocations of the DSP-200/300 “parent device”.

7. Use the COM Port device names (COM2, COM4, etc.) to access
any of the particular serial ports on the DSP-200/300. This
name is required by a Windows 95 application when accessing
a particular port.

DSP-200/300 User's Manual 3-3

Figure 4. Windows 95 Device Manager

3.2.2 Changing Resource Settings with Device Manager

1. Start the Windows 95 Device Manager.

2. Double click on the hardware class Multi-function Adapters to
list hardware devices in the class.

3. The DSP-200/300 “parent device” belongs to this hardware
class. The device name for the DSP-200/300 is Omega

DSP-200/300: 2 RS-422/RS-485 Serial Ports.

4. Open the Properties dialog for the DSP-200/300 device, then
click the Resources tab to view the Input/Output Range and
Interrupt Request resource allocations. (see Figure 6. Windows
95 Resource Allocation)

3-4

5. Several predefined Basic Configurations have been included
for the DSP-200/300 (see Figure 5. DSP-200/300 Basic
Configuration Table). The Basic Configurations provide many
combinations of the operating modes and options listed below.
See the Hardware Information section of this manual for
complete descriptions.

v I/O address range and mode: The DSP-200/300 is addressable

in two modes: “block” mode and “COM” mode. When the
DSP-200/300 is configured in “COM” mode, standard addresses
for either COM1/COM3 or COM2/COM4 will be used.
Addresses 3F8/3E8 are the standard addresses for
COM1/COM3, and addresses 2F8/2E8 are the standard
addresses for COM2/COM4. Some older applications are
limited to using COM ports 1-4, in which case “COM” mode
addressing is necessary. When the DSP-200/300 is configured
in “block” mode, non-standard base addresses are used.
Windows 95 enumerates any COM port at a non-standard
address starting with COM5.

v RTS - CTS modem control handshaking: When modem control

handshaking is enabled, the 16C550 UART’s RTS and CTS
signals are connected to the RS-422/485 auxiliary channel. The
auxiliary channel may then be used for handshaking between a
DSP-200/300 RS-422/485 port and a peripheral device. When
modem control handshaking is disabled, the RTS and CTS
signals from the 16C550 UART are looped back to each other.

v RS-422/485 output drivers enable option: The DSP-200/300’s

ports may be configured for either full duplex or half duplex
operation with this option. The default setting is the RS-422/485
ports are configured for full duplex operation with the
RS-422/485 output drivers always enabled. In half duplex
mode, the RS-422/485 transmitter may be enabled and disabled
via the RTS (request to send) or DTR (data terminal ready)
signals. Both RTS and DTR are controlled through the Modem
Control Register of the 16550.

When the Use Automatic Settings check box is enabled Windows
95 will attempt to configure the DSP-200/300 in the order listed in
the Basic Configurations table.

DSP-200/300 User's Manual 3-5

RTS Controlled

Enabled

350, 358

0029

RTS Controlled

Disabled

350, 358

0028

DTR Controlled

Enabled

350, 358

0027

DTR Controlled

Disabled

350, 358

0026

Always Enabled

Enabled

350, 358

0025

Always Enabled

Disabled

350, 358

0024

RTS Controlled

Enabled

340, 348

0023

RTS Controlled

Disabled

340, 348

0022

DTR Controlled

Enabled

340, 348

0021

DTR Controlled

Disabled

340, 348

0020

Always Enabled

Enabled

340, 348

001F

Always Enabled

Disabled

340, 348

001E

RTS Controlled

Enabled

290, 298

001D

RTS Controlled

Disabled

290, 298

001C

DTR Controlled

Enabled

290, 298

001B

DTR Controlled

Disabled

290, 298

001A

Always Enabled

Enabled

290, 298

0019

Always Enabled

Disabled

290, 298

0018

RTS Controlled

Enabled

120, 128

0017

RTS Controlled

Disabled

120, 128

0016

DTR Controlled

Enabled

120, 128

0015

DTR Controlled

Disabled

120, 128

0014

Always Enabled

Enabled

120, 128

0013

Always Enabled

Disabled

120, 128

0012

RTS Controlled

Enabled

110, 118

0011

RTS Controlled

Disabled

110, 118

0010

DTR Controlled

Enabled

110, 118

000F

DTR Controlled

Disabled

110, 118

000E

Always Enabled

Enabled

110, 118

000D

Always Enabled

Disabled

110, 118

000C

RTS Controlled

Enabled

2F8, 2E8

000B*

RTS Controlled

Disabled

2F8, 2E8

000A*

DTR Controlled

Enabled

2F8, 2E8

0009*

DTR Controlled

Disabled

2F8, 2E8

0008*

Always Enabled

Enabled

2F8, 2E8

0007*

Always Enabled

Disabled

2F8, 2E8

0006*

RTS Controlled

Enabled

3F8, 3E8

0005*

RTS Controlled

Disabled

3F8, 3E8

0004*

DTR Controlled

Enabled

3F8, 3E8

0003*

DTR Controlled

Disabled

3F8, 3E8

0002*

Always Enabled

Enabled

3F8, 3E8

0001*

Always Enabled

Disabled

3F8, 3E8

0000*

Output Drivers

Handshaking

Port Addresses

Basic

Configuration

DSP-200/300

RTS - CTS

RS-422/485

Figure 5. DSP-200/300 Basic Configuration Table.

* Indicates “COM” mode addressing. Addresses 3F8/3E8 are the standard
addresses for COM1/COM3. Addresses 2F8/2E8 are the standard addresses for
COM2/COM4. All other basic configurations use “block” mode addressing at

3-6

non-standard base addresses. Windows 95 enumerates any COM port at a
non-standard address starting with COM5.

DSP-200/300 User's Manual 3-7

6. Select a Basic Configurations that displays "No conflicts" in the
bottom display region titled Conflicting Device List from the
drop down list. Some applications may not be able to access
ports higher than COM4. To use the DSP-200/300 PCMCIA
serial ports with these applications you might be forced to
remove other serial communications devices from your system.

Figure 6. Windows 95 Resource Allocation

7. Windows 95 should have chosen an available Interrupt
Request setting automatically when the I/O address range was
configured by a Basic Configuration selection. This default
Interrupt Request setting should not need changed as long as
"No conflicts" is displayed in the bottom display region titled
Conflicting Device List. If you are satisfied with Windows 95
selection then skip the next step.

3-8

8. To modify the Interrupt Request setting click the resource
name and click the Change Setting button. An Edit Resource
window will open up. Inside this window click on the
up/down arrows to the right of the Interrupt Request value.
This scrolls you through all of the allowable resources for your
hardware. Pay attention to the conflict information at the
bottom of the window. Do not select a value that causes a
conflict with any other installed hardware.

9. If any changes have been made to the DSP-200/300’s
configuration the card will automatically be reconfigured to the
new resources specified. Any time a PCMCIA card of this type
is inserted Windows 95 will attempt to configure the card at
these resource settings. Click the Use Automatic Settings box
to reset this card type for automatic configuration.

DSP-200/300 User's Manual 3-9

4. OS/2 Installation

In order to use the DSP-200/300 Client Driver for OS/2, the system must
be configured as follows:

1. The system must be running OS/2 version 2.1 or later.

2. OS/2 PCMCIA Card and Socket Services support must be
installed. If PCMCIA support was not selected when OS/2 was
installed, it can be added using the Selective Install facility in
the System Setup folder. On OS/2 2.1 and 2.11, Socket Services
must be added separately. The necessary files can be found on
Compuserve in the OS2SUPPORT forum and may be available
elsewhere. These files are not available from
Omega Engineering, Inc.

3. Omega's OS/2 serial port device driver, "QCOM" version 2.01
or later, must be installed. The DSP-200/300 will not
with the standard OS/2 serial port device drivers.
Omega Engineering, Inc. can not guarantee the operation of the
DSP-200/300 with any other third party device drivers for
OS/2.

operate

4. There must be at least 16 bytes of available I/O space and 1
available IRQ.

After the system has been configured to the above specifications, the
DSP-200/300 Client Driver may be installed with the following
procedure:

1. Copy the DSP200.SYS client driver file from the distribution
disk to any convenient directory on the hard disk.

2. Open the CONFIG.SYS file using any ASCII text editor.

3. Add the following line to the CONFIG.SYS file:

DEVICE = drive:\path\DSP200.SYS options
where options are the DSP-200/300 OS/2 Client Driver
command line options discussed in the following sections.

4. Save the CONFIG.SYS file, exit the text editor, shutdown the
system, and reboot to activate the changes.

4-1

4.1 Command Line Options

The DSP-200/300 Client Driver for OS/2 supports two methods of
configuration: using "system assigned" resources and using "user
assigned" resources. Both options provide full PCMCIA compliance and
functionality (including "Hot-swapping") but each has some advantages
and disadvantages as discussed in the following sections.

4.1.1 Configuring With "System Assigned" Resources

Allowing the OS/2 Plug-and-Play system to assign the hardware
resources to the DSP-200/300 is the ideal choice when only OS/2
programs will access the serial ports. When configuring the hardware,
the user simply specifies a list of COM port numbers. When a
DSP-200/300 is inserted into a PCMCIA socket, the client driver will
configure the card as a series of COM ports, starting with the lowest
available port number in the list.

Configuring a DSP-200/300 with system assigned resources can be a
problem, however, if DOS and/or Windows applications will be
accessing the serial ports. This is because most DOS applications write
directly to the communications hardware and the Windows' Control
Panel also wants to know the hardware configuration of the serial ports.
In these cases, the user may want to configure the DSP-200/300 with "user
assigned" resources.

.1.1.1 Example 1

4

DEVICE=C:\DSP-200\DSP200.SYS COM3

In example 1, the Client Driver will attempt to configure the DSP-200/300
as COM3 and COM4. If COM3 or COM 4 already exists in the system, the
DSP-200/300 will not be configured. Furthermore, only one DSP-200/300
can be installed in this system.

.1.1.2 Example 2

4

DEVICE=C:\DSP-200\DSP200.SYS COM7 COM3

In example 2, the Client Driver will attempt to configure the DSP-200/300
as COM3 and COM4. If COM3 or COM4 already exists in the system, the
Client Driver will attempt to configure the DSP-200/300 as COM7 and
COM8. If COM7or COM8 already exist already exist in the system, the

DSP-200/300 User's Manual 4-2

DSP-200/300 will not be configured. Up to two DSP-200/300s can be

the system, the DSP-200/300 will not be configured.

as COM3 and COM4 using I/O addresses 100-10F hex and IRQ 5. If

installed in this system.

4.1.2 Configuring With "User Assigned" Resources

As mentioned in the previous section, allowing the OS/2 Plug-and-Play
system to assign the hardware resources to the DSP-200/300 is ideal for
OS/2 programs but can be a problem if DOS and/or Windows
applications will be accessing the serial ports. This is because most DOS
applications write directly to the communications hardware and the
Windows' Control Panel also wants to know the hardware configuration
of the serial ports. For this reason, the DSP-200/300 Client Driver allows
the user to request specific hardware settings using a series of command
line arguments of the form

(port,address,irq)

port specifies the beginning COM port number
address specifies the base I/O address of the DSP-200/300 in

hexadecimal and must reside on an even 16-byte (10H)
boundary.

irq specifies the interrupt level (IRQ) of the DSP-200/300 in

decimal. irq must be one of the following values: 3, 4, 5, 7, 9,
10, 11, 12, 14, or 15.

Each argument must be enclosed in parentheses and must be separated
from other arguments by a space
argument, the parameters must be separated using a comma
When a DSP-200/300 is inserted into a PCMCIA socket, the client driver
will configure the card as a series of COM ports, starting with the lowest
available port number in the list.

on the command line. Within each

(no spaces).

IMPORTANT:

If the user specified resources are in-use by other devices in

4.1.2.1 Example 1

DEVICE=C:\DSP-200\DSP200.SYS (3,100,5)

In example 1, the Client Driver will attempt to configure the DSP-200/300

4-3

COM3 or COM4 already exists, or if the I/O address or IRQ resources are
already in use, the DSP-200/300 will not be configured. Furthermore,
only one DSP-200/300 can be installed in this system.

.1.2.2 Example 2

4

DEVICE=C:\DSP-200\DSP200.SYS (7,120,15) (3,300,4)

In example 2, the Client Driver will attempt to configure the DSP-200/300
as COM3 COM4 using I/O address 300-30F hex and IRQ 4. If COM3 or
COM4 already exists, or if the I/O address or IRQ resources are already
in use, the Client Driver will attempt to configure the DSP-200/300 as
COM7 and COM8 using I/O address 120-12F hex and IRQ 15. If COM7
or COM8 already exists or if the I/O address or IRQ resources are already
in use, the DSP-200/300 will not be configured. Up to two DSP-200/300s
can be installed in this system.

4.1.3 Advanced Configuration Topics

For some applications, it may be desirable to specify the resources for one
DSP-200/300 while allowing the OS/2 Plug-and-Play system to assign the
hardware resources for any additional cards. This can be accomplished
by mixing the configuration methods on the DSP-200/300 Client Driver
command line

DEVICE=C:\DSP-200\DSP200.SYS (3,100,5) COM7

It is important to remember that when a DSP-200/300 is inserted into a
PCMCIA socket, the client driver will configure the card as a series of
COM ports, starting with the lowest available port number

in the list.

Another common application requirement is to have a DSP-200/300
inserted into socket 1 be configured as COM3 and COM4 while a
DSP-200/300 inserted into socket 2 be configured as COM7 and COM8.
This type of configuration is supported by appending a "=Sx" parameter

any command line argument.

after

DEVICE=C:\DSP-200\DSP200.SYS COM3=S1 COM7=S2

DEVICE=C:\DSP-200\DSP200.SYS (3,100,4)=S1 (7,300,3)=S2

DSP-200/300 User's Manual 4-4

4.1.4 Options

The client driver supports the DSP-200/300’s hardware configuration
options. It also allows a configuration to be tied to a particular socket.
These options are specified on the “DEVICE=” statement line in
CONFIG.SYS.

=HS enables RTS-CTS Hardware Handshake. The RTS signal will

be connected to AUXOUT and the CTS signal will be
connected to AUXIN. This allows RTS-CTS hardware flow
control to be used. If this option is omitted, the default setting
is RTS-CTS hardware handshaking is disabled. When modem
control handshaking is disabled, the RTS and CTS signals from
the 16C550 UART are looped back to each other.

Example: DEVICE=x:\path\DSP200.SYS (3,110,4)=HS

=DTR use DTR to enable outputs on Port A. Outputs are enabled

when the DTR signal is not active. This allows half-duplex
communication. By default, the outputs on port A are always
enabled.

Example: DEVICE=x:\path\DSP200.SYS (15,110,5)=DTR

=RTS use RTS to enable outputs on Port A. Outputs are enabled

when the RTS signal is active. This allows half-duplex
communication. By default, the outputs on port A are always
enabled.

Example: DEVICE=x:\path\DSP200.SYS COM17=DTR

=BON Port B outputs always enabled. By default, the outputs on port

B obey the same control as port A. This option forces the port
B outputs to always be active regardless of the state of Port A.

Example: DEVICE=x:\path\DSP200.SYS COM17=BON

4.1.5 Using Multiple Options

Multiple options on a configuration can be used simply by stacking the
options together.

4-5

Example: On COM3 and COM4, use RTS-CTS flow control and enable
the transmitter outputs with the DTR signal. For COM5 and COM6, leave
RTS and CTS in loopback, and leave the outputs enabled all the time.

DEVICE=x:\path\DSP200.SYS COM3=DTR=HS COM5

4.1.6 Applying Options to All The DSP-200/300 Cards

All options (except socket designation) can also be applied globally to all
DSP-200s. Replace the ‘=’ option with a ‘/’ and place the option by itself
on the command line. These options will override their ‘=’ counterparts.

Example

Always configure a DSP-200 in socket 1 as COM3 and COM4, and a
DSP-200 in socket 2 as COM8 and COM9. In addition, connect RTS and
CTS to AUXOUT and AUXIN respectively, on all ports, and use the DTR
signal to enable the transmit outputs of all ports.

:DEVICE=x:\path\DSP200.SYS COM3=S1 COM8=S2 /HS /DTR

4.2 Monitoring The Status Of PCMCIA Cards

OS/2 Warp provides a utility called "Plug and Play for PCMCIA" that can
be used to monitor the status of each PCMCIA socket. In OS/2 version

2.1, this utility is called "Configuration Manager". When a DSP-200/300
is inserted, the Card Type for the appropriate socket will display
"Multi-Function". If the card is successfully configured, the Card Status
will display "Ready". If the card cannot be configured, the Card Status
will be "Not Ready". You can view the resources claimed by a
configured card by double-clicking on that card's line in the window.

Figure 7. OS/2 Plug and Play GUI with properly configured DSP-200

DSP-200/300 User's Manual 4-6

5. Hardware Information

Base Address + 8

Channel B

Base Address + 0

Channel A

channel

Intr A

Intr B000000D0D1D2D3D4D5D6D7

5.1 I/O Addressing Modes

The DSP-200/300's two asynchronous serial ports are implemented using
2 standard 16C550 UARTs. Each of these UARTs requires 8 bytes of I/O
space. The DSP-200/300's serial ports are addressable in two modes:

1. 'Block Mode' : The two serial ports are configured in one
16-byte continuous block of I/O address space. The block must
begin on an even 16-byte (10H) boundary (e.g. 300H, 310H,
320H, etc.).

Address assignmentDSP-200/300 RS-232

Figure 8. Block Mode Addressing.

2. 'COM Mode' : The two serial ports are configured at the
standard COM port I/O address locations. The ports may be
configured as COM1 and COM3; or as COM2 and COM4.

5.2 Scratchpad Register

Each 16C550 UART contains 8 I/O registers. The last of these registers,
located at (Base address + 7), is referred to as the 'Scratchpad Register'
and provides no functionality to the UART. In place of this Scratchpad
Register, the DSP-200/300 implements an interrupt status register which
can be accessed at (Base address + 7) of any UART.

Figure 9. Interrupt Status Register.

When one or more UARTs have interrupts pending, the associated bit(s)
in the interrupt status register are set to logic 1. When all the pending
interrupts have been serviced for a specific UART, its interrupt status bit
will be cleared to logic 0 automatically. When all
from all

UARTs have been serviced, the entire interrupt status register
will return logic 0. The application program should not exit its interrupt
service routine until all pending interrupts from all channels have been

the pending interrupts

5-1

serviced (interrupt status register = 0) or no additional interrupts will be

Figure 10. Auxiliary Channel RTS-CTS Handshaking.

received.

If an application requires the UARTs' Scratchpad Registers, the interrupt
status register can be disabled. Disabling the interrupt status register is
supported by the DSP-200 configuration software, which is operating
system dependent. Refer to the relevant operating system installation
section for specific usage of this feature.

5.3 Auxiliary Channel Configuration

An auxiliary channel is provided which allows for handshaking between
a DSP-200/300 RS-422/485 port and a peripheral device. This auxiliary
channel may be configured in one of two ways:

v RTS-CTS handshake enabled.
v handshaking is disabled.

Port A and Port B must both be configured in the same manner.

5.3.1 Auxiliary Channel: RTS-CTS Handshaking.

The RTS-CTS handshake may be enabled so that RTS (request to send) is
the auxiliary output signal on AUX OUT+ (pin 1) and AUX OUT- (pin 6).
Similarly, CTS (clear to send) is the auxiliary input signal on AUX IN+
(pin 5) and AUX IN- (pin 9). This configuration is shown below.

16C550

UART

TXD

RS-422/485

Drivers/Receivers

Driver

DATA OUT

+

-

RXD

DATA IN

Receiver

+

-

-RTS

AUX OUT

Driver

+

-

-CTS

AUX IN

Receiver

+

-

DSP-200/300 User's Manual 5-2

5.3.2 Auxiliary Channel: Handshaking Disabled.

The DSP-200/300 RS-422/485 ports may be configured so that the
RTS-CTS handshake is disabled. This is the default configuration. In this
configuration, RTS and CTS from the 16C550 UART will be looped back
to each other. In addition, the auxiliary output and input signals will be
looped back to each other. This configuration is shown below:

16C550

UART

TXD

RS-422/485

Drivers/Receivers

Driver

DATA OUT

+

-

RXD

DATA IN

Receiver

+

-

-RTS

AUX OUT

Driver

+

-

-CTS

AUX IN

Receiver

+

-

Figure 11. Auxiliary Channel Handshaking Disabled

5-3

5.4 Termination Resistors

No termination resistors are provided on the DSP-200/300 RS-422/485
ports. Both output and input signals are connected only to the external
connector. Any termination which is required must be added externally.

RS-422/485 Receiver

+

Rt

-

RS-422/485 Receiver

+

Rt

-

RXD+

RXD-

AUXIN+

AUXIN-

Recommended Termination Resistor Values

RS-422
100 ohm 1/2W resistor

RS-485
60 ohms total resistance
(120 ohms at each end)

Figure 12. RS-422/485 Termination

DSP-200/300 User's Manual 5-4

5.5 Half Duplex Operation

the default mode.

configuration software and/or the operating system used. Each of these,

The DSP-200/300’s ports may be configured for either full duplex or half
duplex operation. By default, the RS-422/485 ports are configured for full
duplex operation with the RS-422/485 output drivers always enabled.

In half duplex mode, the RS-422/485 transmitter may be enabled and
disabled via the RTS (request to send) or DTR (data terminal ready)
signals. Both RTS and DTR are controlled through the Modem Control
Register of the 16550.

3 Options:

Data Out

Half Duplex

-RTS

RS-422/485
Driver

+

-

-DTR

MUX

16C550

Active Low
Output Enable

Aux Out

Full Duplex

RS-422/485
Driver

+

-

NOTE:

If RTS is selected as the signal to enable the output drivers, setting 'bit 1'
of the Modem Control Register (to logic '1') will enable the output drivers
and clearing 'bit 1' of the Modem Control Register (to logic '0') will force
the outputs into a high impedance state.

One of these three options must be selected via
software configuration. Full duplex operation is

Figure 13. RS-422/485 Driver Enable Options

Similarly, if DTR is chosen as the signal to enable the output drivers
setting 'bit 0' of the Modem Control Register (to logic '1') will enable the
output drivers and clearing 'bit 0' of the Modem Control Register (to logic
'0') will force the outputs into a high impedance state.
Selection of half duplex mode operation is dependent upon the

5-5

however, ultimately control the half duplex mode by accessing the

the computer, and/or the peripheral equipment.

0 = block mode

Interrupt Status Register Enabled

1 = Port B output enable same as Port A.

(port B)

11 = Outputs always enabled (I/O Mode)

(This applies to both Port A and Port B.)

0 = Pulse Mode IRQ (500 ns)

operation of the card.

DESCRIPTION

BIT

PCMCIA Configuration Register on the DSP-200/300.

CAUTION:

When operating in half duplex mode, the transmitter output
drivers must be

disabled before receiving and information.
Failure to do so will result in two output drivers being
connected together which may cause damage to the adapter,

5.6 PCMCIA Configuration Register

Some PCMCIA software utilities allow the PCMCIA Configuration
Option Register to be examined. The PCMCIA Configuration Option
Register of the DSP-200/300 is defined as follows:

4:3

2

SRESET7

LevlREQ6

ModemCntrl5

OutputEnA

(Port A)

OutputEnB

ScratchEn1

ConfigMode0

Setting this bit to a 1 resets all bits in the CIS except
for this bit. This bit must be reset to 0 to allow

1 = Level Mode IRQ

1 = RTS- CTS handshake
0 = RTS-CTS loopback

00 = Outputs always enabled (Memory Mode)
01 = DTR used as output enable
10 = RTS used as output enable

0 = Port B outputs always enabled.

1 = Scratchpad Registers Enabled and
Interrupt Status Register Disabled
0 = Scratchpad Registers Disabled and

1 = COM mode

Figure 14. PCMCIA Configuration Options Register

DSP-200/300 User's Manual 5-6

6. External Connections

AUXIN-

9

DATAIN-

8

DATAOUT-

7

AUXOUT-

6

AUXIN+

5

DATAIN+

4

GND

3

DATAOUT+

2

AUXOUT+

1

FUNCTION

PIN

An adapter cable is included with the DSP-200/300 to convert the 25-pin
output connector into 2 standard D-9 female connectors, data terminal
equipment (DTE), as shown in the figure below.

Port A

Port B

Figure 15. DSP-200/300 Adapter Cable.

Figure 16. D-9 Female Signal Assignment.

6-1

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DSP-200/300 User's Manual 6-2

7. Specifications

Bus Interface PCMCIA

PC Card Standard 2.1 compliant

Physical Dimensions Type II PCMCIA card (5mm)

Maximum Baud Rate 120K

Power Requirements +5 volts 35.85 mA (typical)

45.87 mA (maximum)

Connector Adapter to 2 standard female D-9

7-1