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Serial Interfaces
for RS-485 and RS-232
PCI, PXI/CompactPCI, PCMCIA, and ISA Interfaces
PCI-232, PXI-8420, PXI-8422,
PCMCIA-232, AT-232
RS-232 interfaces
Cable lengths to 15.6 m (50 ft)
Compatible with standard PC serial port
Full Windows 2000/9x Plug and Play
compatibility for switchless
configuration
2, 4, 8, and 16 ports
Handle RTS/CTS hardware
handshake lines
460 kb/s maximum transfer rate
Transmit and receive FIFOs up to
64 bytes
Interrupt-sharing between ports
2000 V isolation
Note: Features vary depending
on board model. See detailed
specifications.
Driver Software
NI-Serial for
Windows 2000/NT/Me/9x
PCI-485, PXI-8421, PXI-8423,
PCMCIA-485, AT-485
RS-485 or RS-422 interfaces
Communicates with up to 31 devices
Automatic transceiver-control mode
for 2-wire RS-485 devices
Cable lengths to 1.2 km (4000 ft)
Application Software
LabVIEW
Measurement Studio
Lookout
C/C++
Visual Basic
Any package written to the Microsoft
serial driver interface
Overview
The National Instruments serial interface boards for PCI,
PXI/CompactPCI, PCMCIA, and ISA are asynchronous serial interfaces
for communicating with serial devices. Depending on the platform,
interfaces are available with up to 16 ports and full Windows 2000/9x
Plug and Play compatibility, which gives you the benefit of automatic
configuration for easier installation and maintenance. You can install
and use these boards as standard serial ports from your existing
applications. Development environments such as Visual Basic, Visual
C++, and Excel, as well as our LabVIEW, Measurement Studio, and
Lookout application software products, can access the add-in serial
ports using standard serial I/O functions. All interface devices include
an enhanced serial driver for improved performance, reliable interrupt
sharing between ports, and access to the advanced transceiver
control mode of the RS-485 interface devices.
Cabling
Our 2 and 4-port serial devices are not
shipped with serial interface cables. Two-
port versions use DB-9 male connectors
with standard pin assignments for RS-485
and RS-232 connectors (see Figure 1).
Four-port devices use 10-position modular
phone jacks, so all four connectors can
EXPRESS
CODES
For information or to
buy products online,
visit ni.com/catalog
and enter:
pxi8420
at232
at485
pci232
pci485
pcmcia232
pcmcia485
Pin 5
Pin 9
Pin 6
Pin 1
Figure 1. DB-9 Connector Pin Locations
Isolation
A common problem in many industrial applications is ground loops –
current flowing through the ground line when ground voltage levels
differ between connected devices. On RS-485, this problem results in
a common-mode voltage produced by the difference in ground levels
or by noise induced on both lines. Isolation of serial ports eliminates
this problem and protects the computer system in harsh industrial
environments. The National Instruments PCI, PXI/CompactPCI,
PCMCIA , and AT serial devices are available with optical isolation up
to 2000 V for such applications.
exist on a single back panel (see Figure 2). When purchasing a 4-port
serial device, you must order cables that convert the phone jacks to
either DB-9 or DB-25 male connectors with standard pin assignments.
In general, you should order four converter cables per 4-port serial
device. Note that a converter cable is not designed to go the full
distance from a 4-port serial interface directly to your instruments. Our
most popular converter cables convert the 10-pin phone jack on a
Pin 1
Pin 10
Figure 2. 10-Position Modular Jack Pin Locations
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
821
 
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Serial Interfaces
for RS-485 and RS-232
Pin 50
Pin 34
Pin 1
Pin 1
Pin 35
Pin 51
Pin 68
Pin 100
Figure 3. SCSI 68-Pin Connector Locations
Figure 4. SCSI 100-Pin Connector Locations
4-port device to the same DB-9 male connector found on a typical PC
serial port. The connection from this converter to your serial device uses
the standard serial cables used with the PC serial port.
As an exception to the previous description, National Instruments ships
isolated ISA and PCI 4-channel serial boards with cables to ensure isolation.
The 4-channel PXI serial modules do not require special isolated cables to
ensure isolation; therefore, cables are not shipped with these modules.
The 8-port serial interfaces include an adapter cable that connects to the
SCSI 68-pin connector on the device and terminates in eight standard
DB-9 male connectors (see Figure 3).
The 16-port RS-232 serial interface includes a breakout box that
connects to the SCSI 100-pin connector on the device and terminates
in 16 standard DB-9 male connectors (see Figure 4).
PCMCIA serial cards ship with interface cables that provide one,
two, or four DB-9 male connectors. These DB-9 male connectors
provide standard pin assignments for RS-485 and RS-232 connections.
Note that these cables are not designed to go the full distance from a
PCMCIA serial card to your instrument. The cables provide the same
DB-9 male connectors found on a typical PC serial port.
Ordering Information
Model
Serial
Bus
Number
FIFO
Max Transfer
Isolation
Cables
Part Number
Port
of Ports
Size B
Rate kb/s
Included
PCI
PCI-485/2
RS-485/422
PCI
2
64
460
–
–
777641-02
PCI-485/4
RS-485/422
PCI
4
64
460
–
–
777641-04
PCI-485/8
RS-485/422
PCI
8
64
460
–
777641-08
PCI-485I/2
RS-485/422
PCI
2
64
460
–
777853-02
PCI-485I/4
RS-485/422
PCI
4
64
460
777853-04
PCI-232/2
RS-232
PCI
2
64
115.2
–
–
777642-02
PCI-232/4
RS-232
PCI
4
64
115.2
–
–
777642-04
PCI-232/8
RS-232
PCI
8
64
115.2
–
777642-08
PCI-232/16
RS-232
PCI
16
64
115.2
–
777642-16
PCI-232I/2
RS-232
PCI
2
64
115.2
–
777854-02
PCI-232I/4
RS-232
PCI
4
64
115.2
777854-04
PXI
PXI-8420/2
RS-232
PXI
2
64
115.2
–
–
777733-02
PXI-8420/4
RS-232
PXI
4
64
115.2
–
–
777733-04
PXI-8420/8
RS-232
PXI
8
64
115.2
–
777733-08
PXI-8420/16
RS-232
PXI
16
64
115.2
–
777733-16
PXI-8421/2
RS-485/422
PXI
2
64
460
–
–
777735-02
PXI-8421/4
RS-485/422
PXI
4
64
460
–
–
777735-04
PXI-8421/8
RS-485/422
PXI
8
64
460
–
777735-08
PXI-8422/2
RS-232
PXI
2
64
115.2
–
777736-02
PXI-8422/4
RS-232
PXI
4
64
115.2
–
777736-04
PXI-8423/2
RS-485/422
PXI
2
64
460
–
777737-02
PXI-8423/4
RS-485/422
PXI
4
64
460
–
777737-04
PCMCIA
PCMCIA-485
RS-485/422
PCMCIA
1
16
115.2
–
777378-01
PCMCIA-485/2
RS-485/422
PCMCIA
2
16
115.2
–
777378-02
PCMCIA-232
RS-232
PCMCIA
1
16
115.2
–
777379-01
PCMCIA-232/2
RS-232
PCMCIA
2
16
115.2
–
777379-02
PCMCIA-232/4
RS-232
PCMCIA
4
64
115.2
–
777379-04
ISA
AT-485/2
RS-485/422
ISA
2
16
115.2
–
–
777311-02
AT-485/4
RS-485/422
ISA
4
16
115.2
–
–
777311-04
AT-485I/2
RS-485/422
ISA
2
16
115.2
–
777501-02
AT-485I/4
RS-485/422
ISA
4
16
115.2
777501-04
AT-232/2
RS-232
ISA
2
16
115.2
–
–
777312-02
AT-232/4
RS-232
ISA
4
16
115.2
–
–
777312-04
AT-232I/2
RS-232
ISA
2
16
115.2
–
777500-02
AT-232I/4
RS-232
ISA
4
16
115.2
777500-04
822
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
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Serial Interfaces
for RS-485 and RS-232
Specifications
Power Requirement (from ISA, PCI, PC Card, or PXI channel)
Signal Compatibility
+5 VDC
+12 VDC
2000 V
Typical
Maximum
Typical
Maximum
Noise Emissions
Optical
only RXD, TXD,
Model
Current
Current
Current
Current
I/O Connectors
(FCC Class Verified)
Isolation
All Signals
GND, RTS, and CTS
PCI
PCI-485/2
350 mA
750 mA
–
–
DB-9 male
A
–
–
PCI-485/4
700 mA
1.3 A
–
–
10-position jack
A
–
–
PCI-485/8
150 mA
250 mA
80 mA
750 mA
SCSI 68-pin interface
A
–
–
PCI-485I/2
800 mA
1.3 A
–
–
DB-9 male
A
–
PCI-485I/4
1.0 A
1.5 A
–
–
10-position jack
A
–
PCI-232/2
50 mA
100 mA
20 mA
200 mA
DB-9 male
A
–
–
PCI-232/4
70 mA
150 mA
40 mA
400 mA
10-position jack
A
–
–
PCI-232/8
100 mA
180 mA
80 mA
800 mA
SCSI 68-pin female
A
–
–
PCI-232/16
500 mA
1.0 A
–
–
SCSI 100-pin female
A
–
Ports 1-8
Ports 9-16
PCI-232I/2
400 mA
650 mA
–
–
DB-9 male
A
–
PCI-232I/4
500 mA
750 mA
–
–
10-position jack
A
–
PXI
PXI-8420/2
100 mA
150 mA
20 mA
200 mA
DB-9 male
A
–
–
PXI-8420/4
125 mA
200 mA
40 mA
400 mA
10-position jack
A
–
–
PXI-8420/8
150 mA
250 mA
80 mA
800 mA
SCSI 68-pin male
A
–
–
PXI-8420/16
500 mA
1.0 mA
–
–
SCSI 100-pin female
A
–
Ports 1-8
Ports 9-16
PXI-8421/2
350 mA
750 mA
–
–
DB-9 male
A
–
–
PXI-8421/4
700 mA
1.3 A
–
–
10-position jack
A
–
–
PXI-8421/8
1.1 A
2.0 A
–
–
SCSI 68-pin female
A
–
–
PXI-8422/2
400 mA
650 mA
–
–
DB-9 male
A
–
PXI-8422/4
500 mA
750 mA
–
–
10-position jack
A
–
PXI-8423/2
800 mA
1.3 A
–
–
DB-9 male
A
–
PXI-8423/4
1.0 A
1.5 A
–
–
10-position jack
A
–
PCMCIA
PCMCIA-485
90 mA
100 mA
–
–
DB-9 male
A
–
–
PCMCIA-485/2
95 mA
110 mA
–
–
DB-9 male
A
–
–
PCMCIA-232
40 mA
60 mA
–
–
DB-9 male
A
–
–
PCMCIA-232/2
60 mA
75 mA
–
–
DB-9 male
A
–
–
1
PCMCIA-232/4
60 mA
140 mA
–
–
DB-9 male
A
–
–
ISA
AT-485/2
390 mA
510 mA
–
–
DB-9 male
B
–
–
AT-485/4
600 mA
780 mA
–
–
10-position jack
B
–
–
AT-485I/2
220 mA
260 mA
–
–
DB-9 male
A
–
AT-485I/4
300 mA
360 mA
–
–
10-position jack
A
–
AT-232/2
260 mA
340 mA
–
–
DB-9 male
B
–
–
AT-232/4
340 mA
450 mA
–
–
10-position jack
B
–
–
AT-232I/2
160 mA
200 mA
–
–
DB-9 male
A
–
AT-232I/4
280 mA
320 mA
–
–
10-position jack
A
–
1
Ports 3-4 include all signals but RI
Dimensions
AT interfaces ...............................................
Storage Environment
Ambient temperature.................................. -40 to 125 °C
Ambient temperature (Ethernet).................. -55 to 85 °C
Relative humidity ........................................ 5 to 90%, noncondensing
Electrostatic Discharge Protection by MIL-883C, Section 3015C
Nonisolated devices................................
10.7 by 16.5 cm (4.2 by 6.5 in.)
PCI interfaces..............................................
10.7 by 17.5 cm (4.2 by 6.9 in.)
PCMCIA interfaces.......................................
Type II PC Card
PXI .............................................................
16.0 by 10.0 cm (6.3 by 3.9 in.)
(not including connectors)
1500 V
Operating Environment
Ambient temperature..................................
Isolated devices ......................................
15,000 V
0 to 70 °C
Ambient temperature (Ethernet)..................
-40 to 70 °C
Relative humidity ........................................
10 to 90%, noncondensing
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com
823
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