You are here: Home > Products > ISA Multiport board > C104H

4-port RS-232 ISA serial boards


Features and Benefits

  • Economical, compact ISA boards with 4 RS-232 ports
  • 921.6 Kbps maximum baudrate for super fast data transmission
  • 128-byte FIFO and on-chip H/W, S/W flow control
  • Drivers provided for Windows, Linux, and Unix
  • Easy configuration without switches or jumpers


The 4-port C104H/HS ISA boards offer users an economical, high performance multiport serial communication solution for connecting terminals, modems, printers, data acquisition equipment, and other serial devices to a PC. The boards are a top choice of industrial automation engineers and system integrators, and support many different operating systems, including Windows, Linux, and even Unix. In addition, each of the boards 4 RS-232 ports supports a super fast 921.6 Kbps baudrate.

• Hardware
Comm. Controller 16C550C or compatible x 4
Bus 16-bit ISA
Connector(s) DB37 female

• Serial Interface
Serial Standards RS-232
Number of Ports 4
Number of Boards 4 per PC (max.)
ESD Protection 25 KV on the board (C104HS only)

• Performance
Baudrate 50 bps to 921.6 Kbps

• Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
I/O Address 0x0000-0xFFFF (default = 0x180)
IRQ 2 (9), 3, 4, 5, 7, 10 (default), 11, 12, 15

• Serial Signals

• Driver Support
Operating Systems Windows (2000, XP, 2003, NT, 95, 98, ME, 3.x), DOS, FreeBSD 4.x, Linux 2.2.x (Alpha), Linux Base, SCO UnixWare 2.1.x, SCO UnixWare 7, SCO Open Server 5

• Physical Characteristics
Dimensions 83 x 157 mm (3.27 x 6.18 in)

• Environmental Limits
Operating Temperature 0 to 55C (32 to 131F)
Operating Humidity 5 to 95% RH
Storage Temperature -20 to 85C (-4 to 185F)
Regulatory Approvals EN55022, EN50204, EN61000-4-2, EN61000-4-3, EN61000-4-4, FCC Part 15 Class A

• Power Requirements
Power Consumption 100 mA max. @ +5 V, 100 mA max. @ +12 V, 60 mA max. @ -12 V

• Warranty
Warranty Period 5 years
ISA Board
  Model No. Description


ISA bus, 4-port RS-232 Board


ISA bus, 4-port RS-232 Board with Surge Protection