
104I-COM-8SM Family
PCI-104 8-Port, 4-port, and 2-port Multi-Protocol RS-232, RS-422, RS-485 Serial Communication Boards
Features
- 8, 4, and 2-port PCI-104 serial communication boards
- High performance octal PCI UART
- Field selectable RS-232, RS-422, and RS-485 protocols, jumper configured per port
- Speeds up to 1.8432Mbps in RS-422/485 modes (RS-232 up to 921.6 kbps)
- 16550 compatible register set with 64-byte FIFO for each TX and RX
- ±15kV ESD protection on all RS-232 signal pins
- Full modem control signals in RS-232 mode
- Auto-RTS feature makes half-duplex RS-485 communication effortless
- Fixed bias and jumper selectable termination provided on each RS-422/485 transmit and receive channel
- Software compatible with all operating systems as standard COM port
- RS-485 full-duplex (4-wire) fully supported
- RS-422/RS-485 only versions
FACTORY OPTIONS
- Extended temperature operation (-40°C to +85°C)
- Fast RS-232 version up to 921.6k
- RoHS Available. Please contact us for ordering information
The 104I-COM-8SM Series are feature-rich and allow for the connection of multiple serial devices—ideal for a variety of applications such as POS, gaming systems, retail, hospitality, automation, kiosks, defense industries, high-density networking, or any other application requiring the connection of RS-232/422/485 serial devices to a PCI-104 compatible system. ACCES offers the 104I-COM-8SM, 4SM, and 2SM in both standard and extended temperature versions ideal for outdoor applications, harsh industrial surroundings, or military use.
Accessories
Available accessories include a broad range of cable assemblies, screw terminal boards, adapters, and enclosure/system solutions for quick and easy embedded application setup.
SPECIAL ORDER
Please contact ACCES with your precise requirement. Examples of special orders would be conformal coating, latching and/or right-angle I/O connectors, RJ45 connectivity, longer breakout cables, custom baud rates, custom software, etc... we will work with you to provide exactly what is required.
Software
The 10I-COM-8SM family of boards are supported by all operating systems as standard serial ports. All boards include a free DOS, Linux and Windows XP/Vista/7 compatible software package with sample programs and source code in "C" and Pascal for DOS, and Visual Basic, Delphi, C#, and Visual C++ for Windows. Also provided is a graphical option configuration program in Windows. An easy-to-use Windows terminal program simplifies verification of proper operation. Linux support includes installation files and samples for register-level programming in "C".
Downloads
Available Reference Manuals
- View / Download the 104I-COM-8SM Manual (.PDF)
- View / Download the Software Reference Manual (.PDF)
Available Software Downloads
Available Datasheets
- View / Download the 104I-COM-8SM Data Sheet (.PDF)
Further information about available ACCES Software:
- Redistributing Windows Drivers
- A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.
Specifications

Specification
- PCI Bus: Rev. 2.3
- Memory Space: Requires 4k
- I/O connection: 40-pin headers 0.1” spacing x 2
- Serial ports: 8, 4, or 2-ports, RS-232, RS-422, or RS-485, selectable
16550 Compatible
- UART: Octal type 16C550 with eight 64-byte transmit & 64 byte receive FIFO, 16C550 compliant
- Data Size: 5, 6, 7 or 8 bits
- Stop bit length: 1, 1.5 or 2 bits
- Parity: Odd, even, none, mark, or space
- Flow Control: RTS/CTS and/or DSR/DTR, Xon/Xoff
- Break condition: On or off
- Maximum Baud Rate: 1.8432Mbps (RS-422 & RS-485 modes), 460.8Kbps (RS-232 mode standard model), 921.6kbps (RS-232 Fast (-F) factory option)
- Full Duplex Operation
- Software programmable FIFO trigger levels (16C550 trigger levels are fixed)
- 12 standard registers for UART monitoring and control plus special registers
- Loop-back mode
- Scratch pad register
RS-232 Transceiver I/O Characteristics
- Receiver Input Resistance: 3KΩ to 7KΩ
- Receiver Input Sensitivity: ±3V
- Receiver Input Voltage Range: ±15V
- Driver Slew Rate: 30V/µS minimum
- Driver Load Impedance: 3KΩ to 7KΩ
- Driver Output Signal Levels: Loaded ±5.4V typical
- Meets or exceeds the IEEE RS-232 standard
RS-422/RS-485 Transceiver I/O Characteristics
- Receiver Input Sensitivity: ±200mV differential input
- Common Mode Voltage Range: +12V to -7V
- Transmitter Output Drive: 60 mA with thermal shutdown
- Input Impedance: 12 K ohm Min
- Input Hysteresis: 50mV typical
Transceiver ESD Characteristics
- ±15kV Human Body Model
- ±15kV Air Discharge
- ±8kV Contact Discharge
Communications Interface
- Eight channels split between two 40 pin male headers
- Meets or exceeds the IEEE RS-232 standard
Environmental
- Operating Temperature Range:
- Commercial: 0° to 70°C
- Industrial: -40°C to +85°C
- Humidity: 5% to 95%, non-condensing
- Storage Temperature Range: -65°C to +125°C
- Power Required: +5VDC, 50mA quiescent, 150mA maximum (nothing connected on I/O connectors)
- Size: PCI-104 format, 3.5" x 3.75"
Regulatory Compliance
- This product is designed to be in full compliance with CE requirements. CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.
Model Price (USD) 104I-COM-8SM 299.00 104I-COM-4SM 249.00 104I-COM-2SM 219.00 104I-COM-8S 269.00 104I-COM-4S 199.00 104I-COM-2S 169.00
Ordering Guide 104I-COM-8SM PCI-104 (no ISA connector) 8-port RS-232/422/485 serial communication board 104I-COM-4SM PCI-104 (no ISA connector) 4-port RS-232/422/485 serial communication board 104I-COM-2SM PCI-104 (no ISA connector) 2-port RS-232/422/485 serial communication board 104I-COM-8S PCI-104 (no ISA connector) 8-port RS-422/485 (no RS-232) serial communication board 104I-COM-4S PCI-104 (no ISA connector) 4-port RS-422/485 (no RS-232) serial communication board 104I-COM-2S PCI-104 (no ISA connector) 2-port RS-422/485 (no RS-232) serial communication board Accessories C104-40F-D9M 40 pin ribbon cable with female header to 4 DB9M connectors, 12" long $25 C104-40F-12 40-pin ribbon cable with female headers, 12" long $12 C104-40F/D37F 40 pin ribbon to DB37 female cable $17.50 C104-D37M/D9M 3' round-wire breakout cable, male DB37 to four male DB9 connectors $31 UTBK-40R Direct connect 40-pin removable screw terminal board $49 STB-40 Screw terminal board for 40 pin header type connector $44 ADAP9 Screw terminal adapter (single DB9 female to 9 screw terminals) $19 ADAP9-2 Screw terminal adapter (dual DB9 female to 18 screw terminals) $25 104-HDW-KIT(X) Specify metric (M) or standard (S) hardware kit. Includes 4 screws, nuts and standoffs $10 MP104-DIN DIN-rail mounting provision $19 PCI-P104-ADAP PCI to PC/104-Plus adapter card permits a PC/104-Plus board to be installed in a PCI slot $129 104-BP2 Backplane with two side-by-side 16-bit PC/104 connectors $99 Options (call for pricing) -T Extended operating temperature (-40°C to +85°C) -F Fast version (RS-232 up to 921.6kbps) -RoHS RoHS compliant version -Call Contact ACCES with your special requirement
