IBT Technologies Inc.
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IBT Technologies Inc.; 5405 Thimens; Quebec, Canada H4R 2H4; 1-866-590-4288; info@ibt.ca
I/O 8243 PC-104(ISA) RS-422/485
Product detail



PC/104 serial interface module that combines small size, industrial grade construction and reliability specifications, plus perform the functions most commonly need in embedded application. Because PC/104 modules use as smart stacking bus design, they avoid the costs and bulk associated with backplanes or card cage.

Multi-port PC/104 serial module equips with 2 or 4 ports high speed RS-422/485 standard serial ports. You can configure the I/O base address and interrupt vector of each serial port. Each serial port has built-in 64 byte hardware FIFO, and provides data transfer speed up to 921Kb/Sec with industry standard 16C750 asynchronous communication chip. Its work with PC/104 CPU boards that accept the PC/104 expansion interface, and comes with DB9 or DB25 connection cables are available as options to meet users' varied connection requirements.


  • 2 or 4 independent RS-422/485 serial ports
  • SUN1699 chipset hardware flow control
  • Each serial port has built-in 64 byte hardware FIFO
  • Automatic RS-485 RTS signal control technology
  • RTS/CTS Handshaking Communication mode for RS-422/485
  • Built-in termination resistors to avoid cross-talking
  • IRQ and I/O address selectable for each serial port by jumper
  • Ideal for PC/104 embedded systems


Type PC/104 Embedded Serial card
Mode of Operation Differential
Bus Transceiver RS-422 Full-Duplex
RS-485 Half-Duplex
Driver per Line RS-422: 1 Driver
RS-485: 32 Drivers
Receiver per Line RS-422: 10 Receivers
RS-485: 32 Receivers
Host Controller SUN1699 UART (16C750 compatible)
Bus Interface PC/104 16-bit ISA
PCB Connector 10-pin IDC male
Number of Port 2 x RS-422/485
IRQ 3 / 4 / 5 / 7 / 9 / 10 / 11 / 12 / 15
I/O Address 3F8, 3E8, 2F8, 2E8, 260, 268, 250, 258, 240,248, 230, 238
FIFO 64 byte hardware FIFO
RS-485 RTS Control Auto RTS Signal Control (ARSC™)
RS-422/485 Select RS-422/485 Auto Identify & Switch (AIS)
Baud Rate 75bps ~ 921.6 Kbps
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Odd, Even, Space, Mark
Flow Control None, Xon/Xoff, RTS/CTS
Data Signal RS-422: Tx+, Rx+, Tx-. Rx-, RTS+, CTS+, RTS-, CTS-
RS-485: Data+, Data-, RTS+, CTS+, RTS-, CTS-
OS Support
Microsoft Windows CE4.2/CE5.0/3.x/95/98SE/Me/NT/2000/XP/2003
Linux 2.0.x, 2.2.x, 2.4.x
Operating Environment
Operating Temperature 0 ~ 57 °C
Humidity 5 ~ 95% RH
Storage Temperature -20 ~ 85 °C
Regulatory Approvals
Hardware CE, FCC (Class B)

Package list

  • PC/104 RS-422/485 Embedded Board
  • Cable 2 x 10-pin IDC to DB9M or DB25M
  • Software %anp; driver CD
  • User manual
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