CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
MARCH 2000
IC110C
IC174C
Dual Port RS-232 Serial Interface
DUAL PORT RS-232 SERIAL INTERFACE
FEDERAL COMMUNICATIONS COMMISSION
AND
CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy and
if not installed and used properly, that is, in strict accordance with the
manufacturer’s instructions, may cause interference to radio communication.
It has been tested and found to comply with the limits for a Class A
computing device in accordance with the specifications in Subpart J of Part 15
of FCC rules, which are designed to provide reasonable protection against
such interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is likely to
cause interference, in which case the user at his own expense will be required
to take whatever measures may be necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from
digital apparatus set out in the Radio Interference Regulation of the Canadian
Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par le ministère des Communications du Canada.
TRADEMARKS USED IN THIS MANUAL
AT and IBM are registered trademarks of International Business Machines
Corporation. PC/XT and XT are trademarks of International Business
Machines Corporation.
DUAL PORT RS-232 SERIAL INTERFACE
Contents
Chapter Page
1. Specifications...................................................................................................1
2. Introduction ....................................................................................................2
2.1 Overview..................................................................................................2
2.2 What’s Included......................................................................................2
2.3 Features...................................................................................................3
2.4 Technical Description............................................................................4
3. Address Selection............................................................................................6
4. Option Selection .............................................................................................8
5. Installation.....................................................................................................10
5.1 Installing the Adapter in Your Operating System...............................10
5.1.1 Windows 3.1x...............................................................................10
5.1.2 Windows 95/98 ...........................................................................10
5.1.3 Windows NT ................................................................................10
5.2 Installing the Hardware ........................................................................10
Appendix: Cicuit-Board Design ........................................................................11
1
CHAPTER 1: Specifications
Protocol — Asynchronous
Number of Ports — 2
Speed — IC110C: Up to 115.2 Kbps; IC174C: 460.8 kbps and higher
Operation — RS-232
Connectors — (2) DB9M
Maximum Distance — 50 ft. (15.2 m) @ 19.2 Kbps with 2500 pF max. cable
capacitance (lower capacitance will allow greater distances)
Communications Chip — IC110C: 16550 UART; IC174C: 16950 UART
MTBF — >150,000 hours
MTTR — <0.25 hours
Materials — Boards are solder mask over bare copper or tin nickel
Operating Temperature — 32° to 122°F (0° to 50°C)
Storage Temperature — -4° to 158°F (-20° to 70°C)
Humidity — 0 to 90% relative humidity, noncondensing
Power — +5 VDC @ 270 mA ±12 V @ 50 mA
Size — 5"W x 5"D (12.7 x 12.7 cm)
Weight — 0.2 lb. (0.1 kg)
1. Specifications
2
DUAL PORT RS-232 SERIAL INTERFACE
2.1 Overview
The Dual Port RS-232 Serial Interface provides your PC system with two RS232 asynchronous ports. Connect to any device that uses the RS-232 protocol,
such as modems, data-entry terminals, and plotters.
The Serial Interface also includes a serial utility diskette with Seacom, a DOS
interrupt and driver package. Seacom allows data to be buffered, eliminating
data loss in high-speed data transfers. It also allows more than 4 ports (256
max.) to be configured and utilized under DOS.
The README file on the serial utility diskette contains information about the
latest changes and revisions. To view this file, insert the diskette into drive A
or B and type A:TYPE READ.ME|MORE [ENTER] or B:TYPE
READ.ME|MORE [ENTER].
2.2 What’s Included
Your Serial Interface should come with the following items. If any of these
items are missing or damaged, contact your supplier.
(1) Dual Port RS-232 Serial Interface,
(2) serial utility software diskettes: (1) for 32-bit Windows®,
(1) for DOS and Windows®3.1x
This manual
2. Introduction
3
CHAPTER 2: Introduction
2.3 Features
Listed below are the special features your Serial Interface offers.
• Each port is independently addressable.
• Eight interrupt options, including AT interrupts, for simple integration
into existing systems.
• IRQs can be shared or individually set for each port.
• Supports Interrupt Sharing—only one interrupt line required for multiple
ports.
• Supports any character set defined by binary notation.
• 16550 UARTs (IC110C) or 16950 UARTs (IC174C) help ensure against
data loss.
• Faster baud rates—up to 115.2 Kbps (IC110C) or 460.8 kbps and higher
(IC174C).
• Dual DB9 male AT®style connectors.
• Individually selectable address and interrupt (2–5 and 10, 11, 12, or 15 on
the AT connector) for each port.
4
DUAL PORT RS-232 SERIAL INTERFACE
2.4 Technical Description
The Dual Port RS-232 Serial Interface provides the PC/XT™/AT/80X86
computer with two additional serial ports for terminals, modems, printers,
etc. The Dual Port RS-232 Serial Interface can be configured as COM1:
through COM4:, or any other I/O address.
The Dual Port RS-232 Serial Interface (IC110C) utilizes the same 16550
UART chip found in the IBM®asynchronous adapter. This chip features
programmable baud rate, data format, and interrupt control. Refer to the
IBM Technical Reference for details on programming the chip. The IC174C uses
the 16950 UART chip.
Each serial port can be set as COM1:, COM2:, or any other I/O address set up
to 3FF hex, providing total compatibility with most communications software
and languages. Some software packages require the use of the modem
handshake signals such as CTS or DCD. Consult your software manual to
determine handshake-signal requirements. If no requirements are
mentioned, or if you are not sure, a safe configuration is to connect (in your
cable hood) DTR to DSR and DCD, and tie RTS to CTS. This usually satisfies
the modem signal requirements for most communications software.
The table on page 5 shows the connector pinouts for ports J1 and J2 (DB9).
Note that this is the same RS-232 pinout as the DB9 serial AT connector.
5
CHAPTER 2: Introduction
Pin Number Signal Name Mode
3 Transmit Data (TD) Output RS-232
7 Request To Send (RTS) Output RS-232
4 Data Term Ready (DTR) Output RS-232
5 Ground (GND) ––––––––––––
2 Receive Data (RD) Input RS-232
1 Data Carrier Detect (DCD) Input RS-232
6 Data Set Ready (DSR) Input RS-232
8 Clear To Send (CTS) Input RS-232
9 Ring Indicator (RI) Input RS-232
6
DUAL PORT RS-232 SERIAL INTERFACE
NOTE
Be sure to set the address selections and jumper options before
installation.
Each serial port on the Dual Port RS-232 Serial Interface occupies 8
consecutive I/O locations. A DIP switch is used to set the base address for
these locations. Be careful when selecting the base address as some selections
conflict with existing PC ports. The following table shows several examples
that usually do not cause a conflict. SW1 sets the I/O address for Port 2 (the
upper connector), while SW2 sets the address for Port 1 (the lower
connector).
Address Binary Switch Position Setting
Hex A9 A0 1 2 3 4 5 6 7
280-287 1010000XXX OFF ON OFF ON ON ON ON
2A0-2A7 1010100XXX OFF ON OFF ON OFF ON ON
2E8-2EF 1011101XXX OFF ON OFF OFF OFF ON OFF
2F8-2FF 1011111XXX OFF ON OFF OFF OFF OFF OFF
3E8-3EF 1111101XXX OFF OFF OFF OFF OFF ON OFF
300-307 1100000XXX OFF OFF ON ON ON ON ON
328-32F 1100101XXX OFF OFF ON ON OFF ON OFF
3F8-3FF 1111111XXX OFF OFF OFF OFF OFF OFF OFF
Typically COM1:=3F8h; COM2:=2F8h; COM3:=3E8h; COM4:=2E8h
If you do not see an address in the table that is compatible with your software,
3. Address Selection
7
you can determine the switch setting for a particular address by using the
following illustration. The illustration shows the correlation between the DIP
switch setting and the address bits used to determine the base address. In the
figure below, the address 300 hex through 307 hex is selected (300 HEX =11
0000 0XXX in binary representation). Note that setting the switch ON (or
closed) corresponds to a “0” in the address, while leaving it OFF (or open)
corresponds to a “1.”
CHAPTER 3: Address Selection
A9 A3 EN
ON
12345678
8
DUAL PORT RS-232 SERIAL INTERFACE
NOTE
Be sure to set the address selections and jumper options before
installation.
The board contains several jumper straps for each port which must be set for
proper operation.
Port Enable/Disable
Each port on the Dual Port RS-232 can be enabled or disabled with switch
position 8 on the DIP switch. The port is enabled with the switch ON (or
closed) and disabled when OFF (or open). Switch 2 (SW2), position 8
enables/disables Port 1, while Switch 1 (SW1), position 8 enables/disables
port 2. If either port is disabled, be sure to also disable the interrupt request
for that port by removing the IRQ jumper (see Figure 4-1).
Setting the Interrupt Request
Headers E1 and E2 select the interrupt request for each serial port. If COM1:
is selected, this jumper must be on the IRQ4 setting. If COM2: is selected, this
jumper must be on IRQ3. Both ports can be set to the same IRQ setting. If no
interrupt is desired, remove the jumper.
NOTE
Most communications software applications default COM3: to IRQ4 and
COM4: to IRQ3. This requires the sharing of interrupts between COM1:
and COM3:, and between COM2: and COM4:. While this is the default, it
is not always the best setting. Check your software configuration
instructions to determine the most appropriate IRQ setting.
4. Option Selection
9
Figure 4-1. Header E1 and E2 (IRQ 4 selected).
Headers E3 and E4 select the (normal) single-interrupt-per-board mode or
the multi-interrupt mode, which allows you to share both interrupts on this
card. The multi-interrupt mode also allows you to share the IRQ signal(s) with
other cards that support multiple interrupts.
Figure 4-2. Headers E3 and E4 in Normal Mode.
CHAPTER 4: Option Selection
2
3
4
5
10
11
12
15
E3E3E4
MN
10
DUAL PORT RS-232 SERIAL INTERFACE
IMPORTANT
You MUST set up the operating system BEFORE you physically install
the Card.
5.1 Installing the Adapter in Your Operating System
If you are installing an ISA adapter in DOS, OS/2®, or QNX, please refer to the
appropriate directory on one of the Serial Utilities Disks for instructions.
5.1.1 W
INDOWS
3.1
X
Please refer to the /WINDOWS sub-directory on the Serial Utilities Diskette for
help files and current information on the installation of the Card in this operating
environment.
5.1.2 W
INDOWS
95/98
For the ISA card, run setup the Serial Utilities Diskette before installing the
card. Make note of the resources that Windows assigns the adapter and set the
adapter to match those resources. Power down the computer and install the
adapter.
5.1.3 W
INDOWS
NT
For the ISA card, run setup on disk two of the Serial Utilities Diskettes before
installing the card. After installing the software, refer to the help file that
automatically comes up for installation instructions.
5.2 Installing the Hardware
The Dual Port RS-232 can be installed in any of the PC expansion slots,
except J8 on the original IBM XT™ and Portable. Follow these steps to install
the card:
1. Remove the PC case.
2. Remove the blank metal slot cover.
3. Gently insert the board.
5. Installation
11
CHAPTER 5: Installation
4. Replace the screw.
5. Replace the cover.
If you wish to change any resources assigned to the adapter, refer to the help
file installed in the Black Box folder in the Start, Programs menu.
Installation is complete.
12
DUAL PORT RS-232 SERIAL INTERFACE
Appendix: Circuit-Board Design
14
P2
P1
1
C8
U1
U4
U6
C1
J1
C5
U7
PORT1
R1
C4
R2
5
9
E1 E2
PORT2
2
3
4
5
10
11
12
15
U5
M N
1
1
D1R4D2
R5
J4
13
25
E3
E4
C9
U6
2
3
4
5
10
11
12
15
C6
1
6
1
6
SW1
SW2
R3
1
1
6
U2
J2
C7
C2
U9
5
9
5
J3
9
C3
U3
Y1
U10
13
APPENDIX: Circuit-Board Design
J1J4J1J4J1J4J1J4J1J4J1
23328574664
TD2/
TD2/
RD2/
RD2/
RTS2/
RTS2/
CTS2/
CTS2/
DSR2/
DSR2/
DTR2/
DTR2/
J4
20
J1J4J1J4J2J3J2
18922119
RI2/
RI2/
DCD2/
DCD2/
DCD1/
J3
J2J3J2J3J2J3J2J3J2J3J2
9
22338877664
RD1/
RD1/
RI1/
RI1/
DCD1/
J3
4
TD1/
TD1/
RTS1/
RTS1/
CTS1/
CTS1/
DTR1/
DTR1/
DSR1/
DSR1/
+5V
14
8
OUT
VDO
Y1
TXCO
NC
VSS
1
7
GND
1
2
+5V
R2
+5V
19
20
VDO
U4
P0P1P2P3P4P5P6
246
A8A6A4
9
R1
12
8
+5V
19
20
VDO
U1
P0P1P2P3P4P5P6
246
A8A6A4
A9A8A7A6A5A4A3
A22
A23
A24
A25
A26
P1P1P1P1P1P1P1
+12V
1234567
U8
VDO VEE+
16151413121110
+5V
TD2
RTS2
BRESET
+5V
1617351213142221191825910363738392827
MR
CS0
XTAL1
XTAL2
U2
VDO
VSS
D0D1D2D3D4D5D6D7DTR
1234567
40
20
+5V
GND
DB0
DB1
8SW2 9
1
P>Q
P=Q
Q0Q1Q2Q3Q4Q5Q6
P7
357
9
8
121416
11
131517
GND
A3A5A7
A9
AEN
2467531
SW2
SW2
SW2
15
1311101214
SW1
1
P=Q
P>Q
Q0Q1Q2Q3Q4Q5Q6
P7
357
9
8
11
121416
131517
GND
A3A5A7
A9
AEN
2467531
AEN
SW1
SW1
SW1
15
1311101214
A11
A27
A28
P1
-12V
8
MC145406
RD2
CTS2
GND
SIN
ADS
RCLK
RTS
8
33323431242315
RTS2
DTR2
DB7
SW2
PORT 2
16
U5
SW1
PORT 1
16
DSR2
CTS
OUT1
GND
74LS244
GND
DCD2
DSR
OUT2
20
RI2
DCD
CSOUT
+5V
VDO/VSS
1
BA0
BA1
RI
A0A1A2
DDIS
BAUDOUT
30
+5V
BRESET
181614
Y1Y2Y3
A1A2A3
G
246
GND
RESET
U9
BA2
26
INTRPT
SOUT
11
TD2
12
BA0
BA1
A0A1A2
B2
A31
P1P1P1
VSS VEE-
9
GND
DTR2
BRD/
BWR/
CS1
CS2
DISTR
DISTR
DOSTR
DOSTR
DB2
DB3
DB4
DB5
DB6
GND
10
VSS
74LS682
Q7
18
SW2
SW2
SW2
GND
10
VSS
74LS682
Q7
18
SW1
SW1
SW1
+12V
1421549101213
V+
INA
INB
ENA
ENB
ENC
OUTA
OUTB
OUTC
368
8250A
GND
2
1
3
U7
R3
BA2
GND
12
10
Y4
U5
VDO/VSS
A4
8
19
A30
A29
P1
INC
G
GND
WR/
IND
END
OUTD
11
74LS125A
BWR/
BRD/
975
Y1Y2Y3
A1A2A3
111315
RD/
B13
P1
GND
7
GND
MC1489
3
Y4
A4
17
B14
P1
+12V
1234567
U10
VDO VEE+
16151413121110
+5V
BRD/
BRESET
+5V
1617351213142221191825910363738392827
MR
CS0
CS1
CS2
XTAL1
XTAL2
DISTR
DISTR
U3
5
4
6
U7
74LS244
D0D1D2D3D4D5D6
DOSTR
VDO
VSS
D0D1D2D3D4D5D6D7DTR
1234567
40
20
+5V
GND
DB0
DB1
DB2
DB3
DB4
DB5
GND
74LS125A
DB1
DB2
DB3
DB0
GND
+5V
1716151413
18
10
20
B1
B2B3B4B5B6B7B8
VSS
VDO
U6
G
DIRA1A2A3A4A5A6A7A8
3456789
2
1
19
BRD/
A9A8A7A6A5A4A3
P1P1P1P1P1P1P1
TD1
BWR/
GND
ADS
RCLK
DOSTR
8
33323431242315
DTR1
DB6
DB7
DB4
DB5
DB6
12
-12V
8
VSS VEE-
MC145406
9
GND
RTS1
DTR1
RI1
BA0
BA1
BA2
RD1
CTS1
DSR1
DCD1
26
+12V
RI
A0A1A2
SIN
CTS
DSR
DCD
8250A
RTS
OUT1
OUT2
CSOUT
DDIS
BAUDOUT
INTRPT
SOUT
11
30
TD1
RTS1
+12
B9B7B3
P1P1P1
9
10
U7
74LS125A
8
D2
12
R5
3
11 2
DB7
E4
2
11
13579
11
13
15
E2
74LS245
246
8
101214
16
D7
IRQ2
IRQ3
IRQ4
IRQ5
A2
B4
B25
B24
P1P1P1
B23
P1
P1
+5V
-12V
-12V
+5V
E3
IRQ11
IRQ10
D3D4D5
P2P2P2
GND
+5V
13
U7
E1
IRQ12
B29
P1
3
111111111
13579
246
C5 C7
C9 C6 C1 C2 C3 C4
+
12
11
1
2
C8
2
D1
1
12
8
101214
2
3
2
3
2
3
2
3
2
3
2
3
2
3
3
22
GND
GND
B1
B31
P1
P1
74LS125A
R4
11
13
15
16
IRQ15
D6
P2
GND
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746
© Copyright 2000. Black Box Corporation. All rights reserved.
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