Two-port Field Selectable RS-232/422/485 Serial Communication PC/104 Boad
Two-port Field Selectable RS-232/422/485 Serial Communication PC/104 Boad
 Part Number: 104-COM-2SM   SKU Number: 3064
Price:
$160.55
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Two-port Field Selectable RS-232/422/485 Serial Communication PC/104 Boad
Features
  • 2 independent asynchronous serial COM ports
  • Field selectable RS-232, RS-422 and RS-485, independent for each port
  • Auto-RTS feature makes half-duplex RS-485 communications effortless
  • Speeds up to 921.6K with 64-byte FIFO
  • Fixed bias and jumper selectable termination provided on each transmit and receive channel simplifies cabling
  • Programmable individual non-volatile base addresses and IRQs simplifies installation
  • Low power required: +5VDC at 80 mA typical
  • Operates as a standard COM port in all operating systems
  • Factory Options: (call for pricing and availability)
    • 0 to 70 C and -40 to +85 C versions available
    • 4 port version available
  • RoHS Available. Please contact us for ordering information
Functional Description
This is an two asynchronous, serial communication board designed for use on the PC/104 bus. It supports RS-232, RS-422 or RS-485 communications. The board may be installed in any standard PC/104 stack. Connections are made via two 40 pin IDC type right angle connectors. Common applications include POS, gaming systems, machine monitoring, military and high-density networking.

Type 16780 UARTS are used as the asynchronous communication elements. These include 64-byte transmit/receive FIFO buffers to protect against lost data in multitasking systems while maintaining 100% compatibility with the original IBM serial port (software compatible with Windows COM port drivers).

A crystal oscillator located on the board permits precise baud rate capability up to 115,200. Higher speeds, up to 921.6K, are achieved by installing a jumper on the board.

The addresses of the individual channels and IRQ are stored in non volatile memory on the board and loaded into programmed logic when the board is initially powered.

AUTO TRANSCEIVER CONTROL

In RS-485 multidrop communications individual drivers must be enabled when needed and then disabled after use to permit all ports on the network to share a two-wire or four-wire cable. The 104-COM-2SM use an automatic (AUTO) control software selectable channel by channel. The driver is enabled (and the receiver disabled) when data is ready to be transmitted. When transmission is complete, the driver remains enabled for the transmission time of one additional character and then is disabled. This is ideal for use in Windows based applications as the standard Windows COM port driver is used to ensure compatibiliy.

UTILITY SOFTWARE

Tools provided include samples to demonstrate COM port initialization in multiple languages. Driver software is provided by Windows and all other major operating systems, including Linux (16550 compatible.) A graphical Setup program is provided to assist with jumper selections for protocol and address configuration.

 

Ordering Information
104-COM-8SM Eight RS-232/422/485 asynchronous field selectable serial COM ports PC/104 Board
104-COM-4SM Four RS-232/422/485 asynchronous field selectable serial COM ports PC/104 Board
104-COM-2SM TwoRS-232/422/485 asynchronous field selectable serial COM ports PC/104 Board
 
Communications Interface
I/O Connections Via two 40 pin IDC type right angle connectors. There are eight pins per port plus common grounds.
Character Length 5,6,7, or 8 bits
Parity Even, odd, or none
Stop Interval 1, 1.5, or 2 bits
Serial Data Rates Up to 115.2K baud, asynchronous. A faster range of rates, up to 921.6K, is achieved by jumper selection
Multidrop Compatible with RS-485 specifications. Up to 32 drivers and receivers allowed on line. Driver/Receivers used are type 75ALS180. Compatible with RS-422 specifications. Up to ten receivers allowed on line.
Address ISA BUS address is set by jumpers on the board. A “Default” jumper determines whether the channel addresses are sequential or loaded from nonvolatile memory on the board
Interrupts Individual IRQs for each channel are stored onboard in non-volatile memory
Receiver Input Sensitivity ±200 mV differential input
Common Mode Voltage Range +12V to -7V
Transmitter Output Drive Capability 60 mA with thermal shutdown. Jumper selectable terminations for input and output, by channel, are provided
General
Power Required +5 VDC at 80 mA typical, all outputs open
Operating Temperature 0 to 70°C, (-40 to +85°C Optional)
Storage Temperature Range -50 to +120°C
Humidity 5% to 95% RH, non-condensing
Main Product  
Part Number:104-COM-2SM
Two-port Field Selectable RS-232/422/485 Serial Communication PC/104 Boad
$160.55
Quantity: