• Two independent optically-isolated asynchronous serial COM ports.
• Field-selectable RS-422 and RS-485 for each port.
• Auto-RTS feature for effortless half-duplex RS-485 communications.
• Fixed bias and jumper selectable termination on each transmit and receive channel simplifies cabling.
• Supports speeds up to 115.2K.
• Operates as a standard COM port in all operating systems.

• 16850 UARTS with 128-byte FIFO.
• Speeds up to 460.8K.
• Temperature versions available: 0 to 60°C and -40 to +85°C.
• Non-isolated version available.

The Model 104-ICOM-2S is a rugged, low-cost dual-port PC/104 serial communication board with 60V optical isolation. The 104-COM-2S is the non-isolated version. Optical isolation ensures smooth, error-free data transmission in noisy environments. The board features two serial ports based on the 16C550 UART with a 16-byte FIFO, suitable for high-speed communications across various operating systems. Ports are accessible via two DB9 Male connectors with jack screws for secure connections in harsh environments.

Each port's protocol (RS-422 or RS-485) is selectable via jumpers. Supports two- and four-wire communications, including four-wire RS-485. Bias is standard on transmit and receive lines, with jumper-selected termination to simplify system architecture.

The 104-ICOM-2S is compatible with all operating systems and includes a free software package for DOS, Linux, and Windows 95/98/Me/NT/2000/XP/2003. It contains sample programs and source code in "C" and Pascal for DOS, and Visual Basic, Delphi, C++ Builder, and Visual C++ for Windows. A graphical setup program is available for Windows, and embedded OS support includes Windows XPe and CE. A Windows terminal program simplifies operation verification.

• Number of serial ports: 2
• Protocol: RS-422 and RS-485, independent for each port
• Maximum baud rate: 115.2K, with factory option for 460.8K
• UART: 16C550 with 16-byte FIFO, optional 16850 with 128-byte FIFO
• Character length: 5, 6, 7, or 8 data bits
• Parity: Even, odd, or none
• Receiver input sensitivity: Bias and jumper selectable termination
• Common mode voltage range: +12V to -7V
• Transmitter output: 60mA with thermal shutdown, includes factory drive capability bias and jumper selectable termination
• Isolation: 60V between all data lines and ground
• I/O connections: Via two male DB9s with screws for cable connector retention
• Short circuit protection: All outputs protected against continuous short circuit
• Power required: +5VDC at 200mA typical, all outputs open
• Operating temperature: 0 to +60°C, optional -40 to +85°C
• Storage temperature: -50 to +120°C
• Operating humidity: 5% to 95% RH, non-condensing
• PC/104 bus: 8-bit and 16-bit bus headers are used