DTK PII-108 User manual

PII- 108
33-232 Dual [/0 Card
User Manual
Edition 1.01
©1988 Datatech Enterprises Co., Ltd.
The RS-232 Dual l/O Card, this manual and all illustrations in it are
copyrighted with all rights reserved. Under the copyright laws, the RS-
232 Dual l/O Card, this manual and the illustrations may not be copied
without the written consent of Datatech Enterprises Co., Ltd.

FEDERAL COMMUNICATIONS COMMISSION
RADIO FREQUENCY INTERFERENCE STATEMENT
Warning: This equipment has been certified to comply with the limits
for aClass Bcomputing device, pursuant to Subpart Jof Part 15 of FCC
Rules. Only peripherals (computer input/output devices, terminals,
printers, etc.) certified to comply with the Class Blimits may be attached
to this computer. Operation with non-certified peripherals is likely to
result in interference to radio and TV reception.
FCC ID :E5V5K4P|I108
MADE IN TAIWAN R.O.C.
33Checklist
Your RS-232 package contains the following:
.One RS-232 Dual l/O Short Card.
-One user manual.
-One serial port cable.
The following does not apply to any country where such provisions are
inconsistent with local law:
Datatech makes no warranties with respect to this documentation
either express or implied and provides it "as is”. This includes but is not
limited to any implied warranties of merchantability and fitness for a
particular purpose. The information in this document is subject to
change without notice. Datatech assumes no responsibility for any
errors that may appear in this document.
IBM, lBM PC, IBM PC/XT, IBM PC/AT and BASICA are registered
trademarks of International Business Machines Corporation. DOS is a
registered trademark of Microsoft Corp. The typeface used in the text
of this manual is 12 point Helvetica® and is used under licence from the
Allied Corporation, the owner of the typeface.

3Contents
Introduction ..................................................................1
Card layout and ports .............................................2
Serial ports ..................................................................3-11
Serial asynchronous communication ................3
Setting up serial ports ........................................... 4
Existing serial port .................................................5
Setting up COM3 and COM4 ............................6
IRQ settings available on card ............................7
RS-232 connector for serial port #2 ...................8
)Configuring application software........................11
Installation .................................................................... 12-14

'3
)
Introduction
You can rest assured of having made awise choice in
buying the RS-232 Dual l/O Short Card to extend the data
l/O functions of your IBM PC®, PC/XT®, PC/AT® or
compatible computers. With its two serial ports, the RS-
232 will expand the interfaces of your computer so that
you will be able to link up with:
-Modems
-Serial printers
.Otherserial devices
The easy-to-understand, well illustrated instructions in
this manual ensure that even if you are anewcomer to the
computer world, you will have the RS-232 installed and
running with aminimum of effort.

Card layout and ports
The illustration below will familiarize you with the layout
of the RS-232 Dual l/O Card and the location of the two
ports:
Serial port #2
Serial
port #1
W
-)
Serial ports
Serial port #1 is the 25-pin connector, J1, extending
through the mounting bracket on the RS-232 card. A
modern, aserial printer or another device using aRS-232
interface may be connected to serial port #1.
Serial port #2 is a10—pin connector, J2, located on the
RS-232 card. Aflat cable has been included with the RS-
232 card for connection of serial port #2 to serial devices.
Amodem, aserial printer or another device using aRS-
2320 interface may be connected to serial port #2.
Serial asynchronous communication
|BM® and compatible personal computers are limited to
two serial communication ports called COM1 and COM2.
Serial port #1 on the RS-232 card may be set up as
COM1 or COM2 and the same is true of serial port #2 as
long as the two serial ports do not have the same name.
NOTE: COM2 is afactory setting for serial port #1 and
COM1 is the factory setting for serial port #2.
To use acommunication line, you must make sure that
asynchronous communication parameters (baud rate,
parity, data bits and stop bits) of the sending and receiving
devices are properly set. This is done using PC-DOS®'s
MODE command or BASICA®'s OPEN command. Consult
the appropriate manual for details. The RS-232 card's
serial ports are fully compatible with the parameter ranges
specified by the OPEN or MODE commands.
3

Setting up serial parts
If your present system has no serial port, both of the
serial ports on the RS-232 card are ready. as shipped, and
you may connect the ports to serial deVIces Without any
reconfiguration. Otherwise, you will have to change the
settings of the DIP switch on the RS-232 card. .To make
these changes, first find the DIP switch by referring to the
illustration below:
Oz
[IEIDEIUEIDEIEIEI
‘OmeUIAOON-e
O
For the appropriate DIP switch settings, refer to the
tables on the next page.
If your system already has aserial port
If your system already has one serial port, addresses
will conflict upon using the RS—232 card as is. First, find
out if the existing port in your system is named COM1 or
COM2. Then set port #1 on the IRS-232 card so that it has
aunique name. Port #2 on the RS-232 card will be
disabled. Refer to the table below:
Port #1 ON
=COM1
Port #2 a9
disabled
_. O
Port #1 ON
Pon:¢2COM2 WUWBWH
12 3456 7 8 9
disabled
If your computer does not have aserial port, you may
use the card as is. Port #1 and #2 may be COM1 or COM2
as long as the ports have district addresses. The DIP
switch settings are shown below:

Port #1
=COM2
Port #2
=COM1
-Eg NIZI 09.] ht] U1III <”III VE- 00.] DE.
_. O
Port #1
=COM1
Port #2
=COM2
dug MEI ml] J>I'_'l ml:- c>IZI \II] 00E. OI]
_. O
Setting up COM3 and COM4
.As was noted previously, IBM® and compatible per-
sonal computers are limited to two serial communication
ports called COM1 and COM2. However, it you can write
software to enable COM3 and COM4 in your system, the
RS-232 card provides support for this new configuration.
The DIP switch settings are shown below:
Port#1 ON
=COM3 999999999
=COM4
10
)l
Any software written for this new configuration should
include IRQ settings for COM3 and COM4. Because such
IRQ settings may also depend on the particular applica-
tion software used, it is advised that you find the specific
IRQ settings needed before you write this software.
IRQ settings available on card
The DIP switch on the RS-232 card controls the IRQ
settings if you make the serial ports COM1 and COM2. For
the correct settings, simply set the DIP switch as shown on
pages 5and 6.
If you wish to know exactly which switches on the DIP
switch control the IRQ settings, refer to the illustration
below:

ENQQE‘E'QGE'QO
EQQQEQDQQO
39999999910
39999959910
H's-232 connector for serial port #2
To connect aserial device to serial port #2, it is neces-
sary to use the nine-wire ribbon cable with the ten-pin
rectangular connector on one end and the male 25-pin
connector on the other. The female connector will be
plugged into port #2 of the RS—232 card and the male
connector will be plugged into the RS-232 port of aserial
device. Refer to the illustration below:
Serial
connector
To serial
port #2
Note that the red wire on the cable will be attached to
pin 1of serial port #2 on the RS-232 card. Pin 1is marked
on the card. The pinouts for serial port #2 are shown
below:

13
10
10
mNot used 1
OTX 2.
OO 14 RX 3
O
OO4
OO5
O.
00 Serial 6Serial
00port #1 GND 7devrce
OODOB asocket
O0Not used 9-19
08 DTR 20
O0Not used 21
OO 25 RI 22
_0/ Not used 23—25
1O—‘ _
O
O4
8Serial 5Serial
6device
0port #2 7socket
0e
O9GND
01o RLSD
O
Configuring application software
Most communications software can be configured to
send data to either COM1 or COM2. The default is usually
COM1. But what if, for example, your modem is connected
to COM2 and you wish to send data through it to aremote
locafion?
It may be necessary to reconfigure your application
software so that the data is routed to COM2 rather than
COM1.
In many cases, the easiest way to accomplish this is to
redirect temporarily the activities of COM1 to COM2. This
may be done using DOS®'s MODE command. The MODE
command can redirect output destined for aprinter port to
aserial port.
NOTE: If you redirect data to adifferent output port, be
sure that the output port's parameters are properly set to
communicate with the device to which it is connected. See
your DOS® manual for instructions.
11

Installation
Refer to your computer's user manual to open it up.
With anut driver or asmall. screw driver (usually a
Phillips) remove the cover at the back of an unused slot.
Keep the screw to attach the card. Refer to the illustration
below:
Rear panel
Expansion slots
Motherboard
12
)0
v
)0
Before you install the card in your computer, make sure
the computer is unplugged, and then remove any static
electric charge from your body by placing one hand on the
power supply box inside your computer.
Pick up the RS-232 card by its non-conductive edges.
Avoid touching the connector contacts or any components
with your hands as this could damage the card. Insert the
card into an empty expansion slot as shown in the follow-
ing illustration:
Attach the mounting bracket of the card securely to the
rear panel of your computer with the screw you saved.
13