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: [email protected]
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 RS-
232 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.”
A9 A3 EN
ON
12345678
CHAPTER 3: Address Selection
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.
E3
E3
E4
MN
2
3
4
5
10
11
12
15
CHAPTER 4: Option Selection
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
U6
R3
SW1
C1
C3
U3
C8
P1
U4
U1
P2
SW2
U7
J1
1
6
5
9
J4
C9
C5
R2
C4
U5
PORT1
PORT2
E1 E2
2
3
4
5
10
11
12
15
2
3
4
5
10
11
12
15
C2
U2
C6
Y1
U9
U6
M N
E3
E4
1
1
U10
D1
R4
D2
R5
1
1
14
13
25
1
6
1
6
5
9
J3
5
9
J2
R1
C7
Appendix: Circuit-Board Design
13
APPENDIX: Circuit-Board Design
A22
A23
A24
A25
A26
A27
A28
A11
A9
A8
A7
A6
A5
A4
A3
AEN
A8
A6
A4
AEN
A3
A5
A7
A9
RESET
A0
A1
A2
2
4
6
8
GND
1
VDO/VSS
A1
A2
A3
A4
Y1
Y2
Y3
Y4
G
74LS244
11
13
15
17
GND
19
VDO/VSS
A1
A2
A3
A4
Y1
Y2
Y3
Y4
G
U5
74LS244
20
+5V
10
GND
WR/
RD/
9
7
5
3
BWR/
BRD/
GND
15
13
11
10
12
14
16
PORT 1
GND
3
5
7
9
12
14
16
18
U5
U1
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
VSS
P>Q
1
10
GND
74LS682
P=Q
VDO
2
4
6
8
11
13
15
17
P0
P1
P2
P3
P4
P5
P6
P7
GND
15
13
11
10
12
14
16
SW2
SW2
SW2
SW2
SW2
SW2
SW2
2
4
6
7
5
3
1
PORT 2
GND
3
5
7
9
12
14
16
18
U4
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
VSS
P>Q
1
10
GND
74LS682
P=Q
VDO
A8
A6
A4
AEN
A3
A5
A7
A9
SW1
9
8
20
19
+5V
18
16
14
12
BRESET
BA0
BA1
BA2
R1
12
Y1
+5V
20
R2
19
8SW2 9
2
1
+5V
VDO
OUT
+5V
1
7
14
8
GND
TXCO
U2
+5V
GND
U3
VDO
VSS
+5V
GND
40
20
XTAL1
XTAL2
MR
CS0
CS1
CS2
DISTR
DISTR
DOSTR
DOSTR
ADS
RCLK
SIN
CTS
DSR
DCD
RI
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
DTR
RTS
OUT1
OUT2
CSOUT
DDIS
BAUDOUT
INTRPT
SOUT
GND
+5V
BRESET
BRD/
BWR/
RD1
CTS1
DSR1
DCD1
RI1
BA0
BA1
BA2
8250A
U7
1
2
GND
3
74LS125A
+5V
12
R3
P1
P1
P1
P1
P1
P1
P1
P1
19
1
BRD/
3
4
5
6
7
8
9
2
D0
D1
D2
D3
D4
D5
D6
D7
G
DIR
A1
A2
A3
A4
A5
A6
A7
A8
74LS245
B2
B3
B4
B5
B6
B7
B8
B1
U7
5
6
4
74LS125A
GND
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DTR1
RTS1
TD1
8250A
U6
VDO
VSS
+5V
GND
17
16
15
14
13
12
11
10
18
20
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB0
E2
E1
2
E4
E3
U7
8
D2
3
11 2
2
4
6
8
10
12
14
16
2
P2
D6
IRQ15
IRQ10
IRQ11
IRQ12
IRQ2
IRQ3
IRQ4
IRQ5
10
9
74LS125A
3
1
1
D1
2
R5
R4
12
GND
12
GND
16
17
35
12
13
14
22
21
19
18
25
9
10
36
37
38
39
28
27
26
13
12
U7
74LS125A
B1
B31
P1
P1
16
15
14
13
12
11
10
9
VSS VEE-
MC145406
U8
3
6
8
11
OUTA
OUTB
OUTC
OUTD
V+
ENA
INA
ENB
INB
ENC
INC
END
IND
GND
MC1489
+12
-12V
+5V
+5V
+12V
-12V
C8
C9 C6 C1 C2 C3 C4
C5 C7
+
111111111
22
3
+5V
GND
GND
B9
B7
B3
B29
P1
P1
P1
P1
VDO VEE+
+12V
+5V
TD2
RTS2
DTR2
GND
-12V
RD2/
RD2/
TD2/
TD2/
CTS2/
CTS2/
RTS2/
RTS2/
DSR2/
DSR2/
DTR2/
DTR2/
+12V
U9
14
2
1
5
4
9
10
12
13
7
GND
2
4
6
8
11
13
15
17
P0
P1
P2
P3
P4
P5
P6
P7
SW1
SW1
SW1
SW1
SW1
SW1
SW1
2
4
6
7
5
3
1
B2
A31
A30
A29
P1
P1
P1
P1
B13
B14
P1
P1
A9
A8
A7
A6
A5
A4
A3
A2
P1
P1
P1
P1
P1
P1
P1
P1
B4
B25
B24
B23
P1
P1
P1
P1
D3
D4
D5
P2
P2
P2
2
3
3
2
8
5
7
4
6
6
4
20
J1
J4
J1
J4
J1
J4
J1
J4
J1
J4
J1
J4
DCD2/
DCD2/
RI2/
RI2/
DCD1/
DCD1/
RI1/
RI1/
1
8
9
22
1
1
9
9
J1
J4
J1
J4
J2
J3
J2
J3
RD1/
RD1/
TD1/
TD1/
CTS1/
CTS1/
RTS1/
RTS1/
DSR1/
DSR1/
DTR1/
DTR1/
2
2
3
3
8
8
7
7
6
6
4
4
J2
J3
J2
J3
J2
J3
J2
J3
J2
J3
J2
J3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VSS VEE-
MC145406
U10
VDO VEE+
+12V
+5V
TD1
RTS1
DTR1
GND
-12V
1
2
3
4
5
6
7
8
NC
VSS
2
3
2
3
2
3
2
3
2
3
2
3
2
3
1
2
3
4
5
6
7
8
33
32
34
31
24
23
15
30
11
VDO
VSS
40
20
XTAL1
XTAL2
MR
CS0
CS1
CS2
DISTR
DISTR
DOSTR
DOSTR
ADS
RCLK
SIN
CTS
DSR
DCD
RI
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
DTR
RTS
OUT1
OUT2
CSOUT
DDIS
BAUDOUT
INTRPT
SOUT
GND
+5V
BRESET
BRD/
BWR/
RD2
CTS2
DSR2
DCD2
RI2
BA0
BA1
BA2
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DTR2
RTS2
TD2
16
17
35
12
13
14
22
21
19
18
25
9
10
36
37
38
39
28
27
26
1
2
3
4
5
6
7
8
33
32
34
31
24
23
15
30
11
11
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
1
3
5
7
9
11
13
15
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746
© Copyright 2000. Black Box Corporation. All rights reserved.
/
