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All product specifications are subject to change without notice Last updated : January 2005
Pin As sign ments
PCL-740
PCL-741
Or der ing In for ma tion
PCL-740 RS-232/RS-422/RS-485/current-loop serial interface
card
PCL-741 Iso lat ed dual-port RS-232/current-loop interface card.
Specifi cations
Board
Ports 1
Protocol RS-232, RS-422/RS-485 or current-loop (PCL-740)
RS-232 or current-loop (20 mA) (PCL-741)
I/O Address From 200H to 3F8H
IRQ 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, even and odd
Power Isolation 500 V
DC
(PCL-741)
Signal Isolation 2500 V
DC
(PCL-741)
Power Consumption PCL-740: +5 V @ 180 mA max., ±12 V @ 20 mA max.
PCL-741: +5 V @ 300 mA (typical), +5 V @ 1.1 A max.
Connectors DB9 male and DB25 male (PCL-740 only) connectors
Operating Temperature 0 ~ 50°
C (32 ~ 122°
F)
Dimensions 185 x 100 mm (7.3" x 3.9")
Shipping Weight 0.6 kg (1.3 lb)
PCL-740
PCL-741
RS-232/RS-422/RS-485/Current-loop
COMM Cards
Isolated Dual-port RS-232/Current-loop
COMM Cards
RS-232, RS-422, RS-485 or current-loop interface
16C550 UART with 16-byte FIFO
Transmission speeds up to 115 kbps
Flexible I/O address and IRQ selection
IRQ: 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15
Complete RS-232 modem control signals
Supports 4-wire or 2-wire operation for RS-422/485
Automatic RS-485 data flow control
Space reserved for termination resistors
Supports COM1, COM2, COM3, or COM4
Supports Windows
®
98/2000/XP, Linux
®
Powerful and easy-to-use utility (ICOM Tools)
DCD
RX
TX
DTR
GND
TX-
TX+
RX+
RX-
DSR
RTS
CTS
RI
Introduction
The PCL-740 offers a versatile range of high speed interfacing options. You can switch its single port between the popular RS-232, long distance RS-422, multi-drop RS-485, or
noise-resistant current-loop. The card's 16C550 UART has an on-chip 16-byte FIFO buffer for faster and more reliable communication, especially under Windows.
The PCL-741 provides two isolated RS-232 or current-loop serial ports. You can configure each port individually to RS-232 or current-loop using on-board jumpers.
The card has two 16C550 UARTs with on-chip 16-byte FIFO buffers. The UARTs buffer data into 16-byte packets before sending it to the bus. This drastically reduces CPU load
and avoids data loss when the system is busy and cannot process the interrupt quickly. These FIFO buffers make the PCL-741 especially suitable for high speed serial I/O under
Windows.
Onboard optical isolators protect your PC and equipment against damage from ground loops, increasing system reliability in harsh environments.
TX
RX
RT
S
CT
S
DS
R
GND
DCD
CL TX+
CL TX-
CL RX
+
DT
R
RI
CL RX
-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
1
2
3
4
TX-/DATA-
TX+/DATA+
RX
+
RX-
GND
RTS-
RTS+
CTS+
CTS-
PCL-740 PCL-741
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
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