Documentation Number 3PCIOSD1x0402 pg. 1/2
B&B Electronics Revised January 2002
This product designed and manufactured in USA of domestic and imported parts by
Optically Isolated Serial PCI Card
CE
Models: 3PCIOSD1A 3PCIOSD1B
Description
The 3PCIOSD1A and 3PCIOSD1B cards provide 1 optically isolated serial port using a PCI slot. Plug and Play
design lets the Operating System and driver select the IRQ and addresses used by the card. The port can be easily
configured for RS-232, RS-422, or RS-485 (2-wire half duplex or 4-wire full duplex) operation. The RS-485 configuration
provides Automatic Send Data Control, which transparently enables and disables the RS-485 transmitter as needed. The
RS-485 receiver can be set for half duplex control or constantly enabled for echo or full duplex operation. The cards can
be set for quadruple clock speed, permitting baud rates up to 460.8K baud in any mode. The 3PCIOSD1A card uses a
16550A UART that has a high-speed 16-byte input and output buffer to handle fast baud rates. Model 3PCIOSD1B uses
the 16850 UART with a 128-byte input/output buffer. A DB25 male connector with standard pinouts provides easy
connectivity for RS-232 devices. In the RS-422 or RS-485 mode, TD(A), TD(B), RD(A), RD(B) and Signal Common
connections follows RS-530 pinouts.
Features
PCI Bus Version 2.1
Provides 2000 VDC minimum isolation on all supported signals
Easily configured for RS-232, RS-422, or RS-485 operation
Supports baud rates to 460.8K in all modes
RS-232 mode supports TD, RD, RTS, CTS, DTR, DSR, & DCD
RS-422 and RS-485 modes support TD and RD
Automatic Send Data or RTS Control in the RS-485 mode
Can be connected for 2 or 4-wire RS-485 communications
Drivers for Windows 95, 98, ME, 2000 and NT 4.0
Available with high speed FIFO 16850 UART as Model 3PCIOSD1B
3PCIOSD1x
RS-232
Mode
When the port is in RS-232 mode, it functions as a standard PC serial port. 3PCIOSD1x serial cards support the
following RS-232 signals: transmit data (TD), receive data (RD), request to send (RTS), clear to send (CTS), DTE ready
(DTR), DCE ready (DSR), and data carrier detect (DCD). The RS-232 Standard is commonly used for modems, serial
printers, and computer controlled devices such as security equipment, bar code scanners and point-of-sale devices.
RS-422 Mode
The RS-422 Standard uses balanced differential drivers and receivers. A balanced differential system offers greater
distances than an unbalanced system, such as RS-232. In RS-422 mode, 3PCIOSD1x cards support two channels, TD
and RD. The transmitter and receiver are constantly enabled, since only one device is connected at each end, although
one device can transmit to multiple listeners. For more information on RS-422 and RS-485, contact B&B Electronics for a
free RS-422/RS-485 Application Note, available by mail or on our websites,
www.bb-elec.com
or
www.bb-europe.com
.
RS-485 Mode
The RS-485 Standard allows for multiple drivers to share the same communication link. This requires that the
transmitter be enabled only while sending data. 3PCIOSD1x cards offer two ways of enabling/disabling the transmitter:
RTS control and Automatic Send Data control. When using RTS control your software must raise RTS to enable the
transmitter and lower RTS to disable the transmitter. With Automatic Send Data control, simply transmit data out the port.
The card will automatically sense the data and enable the transmitter. When the data transmission is complete, the
transmitter is automatically disabled after 10 data bits (1 character). The receiver can be always enabled (data echo on)
for 4-wire full duplex or it can be disabled when the transmitter is enabled (data echo off) for 2-wire half duplex operation.
Documentation Number 3PCIOSD1x0402 pg. 2/2
B&B Electronics Revised January 2002
This product designed and manufactured in USA of domestic and imported parts by
Connectors
The 3PCIOSD1x cards use a DB25 male connector configured as a standard DTE device in the RS-232 mode. In RS-
422 or RS-485 modes, connections use the RS-530 specification. Pinouts are shown below for RS-232 or RS-422/RS-
485 modes.
In 2-wire RS-485 mode, your cabling must interconnect TD(A) & RD(A) for Data A, and interconnect TD(B) & RD(B)
for Data B.
Specification Summary
Bus Type:
PCI Bus Version 2.1
Baud Rates:
Up to 460.8K baud in all modes
RS-232 mode: Supports TD, RD, RTS, CTS, DTR, DSR, and DCD signals (configured as DTE)
RS-422 mode: Supports TD & RD signals (2 channels). Separate enable/disable on transmitter and receiver.
RS-485 mode: Supports TD & RD signals in full duplex 4-wire mode or half duplex 2-wire mode. With automatic RS-485
driver control the driver is enabled at beginning of data transmission. Driver is disabled within one
character after completion of data transmission. With RTS control, software determines timing. The
receiver can be transmitter controlled or constantly enabled.
Termination:
A jumper selectable 120 ohm termination resistor is provided on the board for the RS-422/RS-485
receiver.
Isolation:
2000 VDC minimum on all supported signals
OS:
Runs under Windows 95, 98, ME, 2000 and NT 4.0
Connector: DB25 male (DB25M)
Dimensions:
6.9 x 4.2 in (17.5 x 10.7 cm)
Accessories: (1) Driver Disk (3.5) & (1) Utilities Disk (3.5)
Max. Power:
All ports loaded
Consumption: +5 V @ 325.0 mA or 1.625 W
Pin
Number
RS-232
Signal Name
Description Direction
(DTE)
RS-422/485
Signal Name
Description Direction
1 Shield
Shield
------ Shield Shield ------
2 TD Transmit
Data
Output
TD (A)
-
Transmit Data A
Output
3 RD Receive
Data
Input
RD (A)
-
Receive Data A
Input
4
RTS
Request to Send
Output
---
---
---
5
CTS
Clear to Send
Input
---
---
---
6
DSR
Data Set Ready
Input
---
---
---
7
GND
Signal Ground
Common
GND
Signal Ground
Common
8
DCD
Data Carrier Detect
Input
---
---
---
14
---
---
---
TD (B) +
Transmit Data B
Output
16
---
---
---
RD (B) +
Receive Data B
Input
20
DTR
Data Terminal Ready
Output
---
---
---
DECLARATION OF CONFORMITY
Manufacturer's Name:
B&B Electronics Manufacturing Company
Manufacturer's Address:
P.O. Box 1040
707 Dayton Road
Ottawa, IL 61350 USA
Model Numbers:
3PCIOSD1A/B
Description:
Optically Isolated Serial PCI Card
Type:
Light industrial equipment
Application of Council Directive:
89/336/EEC
Standards: EN
50082-1:1998
EN 50082-1:1992
IEC 801 (-2, -3, -4)
EN 61000 (-4-2, -4-3, -4-4, -4-6)
ENV
50204
William H. Franklin III, Director of Engineering
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