GX3904 - 4 Port RS-232 & 4 Port RS-422 Interface

4 Port RS-232 & 4 Port RS-422 Interface

4 Port RS232 / 4 port RS422, Comm I/F
  • 8) 16550-based asynchronous communication ports
  • (4) ports configured for RS232
  • (4) ports configured for RS422
  • All 8 ports accessible via a front panel 68 pin SCSI connector
  • Supports data rates up to 115K baud
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The GX3904 is an 8-port, cPCI asynchronous communications interface board supporting (4) RS232 and (4) RS422 signal levels. The four RS232 ports offer a full set of data and modem control lines configured for DTE operation. The four RS422 ports offer differential signaling and support DTE operation. Each RS422 differential pair is terminated by a 150 ohm parallel resistor. An optional transition cable is available to convert the front panel SCSI connector to (8) DB-9, D-sub connectors.


Support for each port is provided by a 16550 UART which operates at data rates up to 115K baud. Mapping of PCI interrupts to each of the (8) interrupts associated with each UART is done via on-board programmable routing logic, allowing any UART interrupt to be routed to any of the PCI INTx request lines. The default routing after reset is for all interrupts to be routed to the INTA line.


Standard Windows COM drivers can be used with the GX3904.


  • Automatic Test Equipment (ATE)
  • Control of computer peripherals
  • Computer to computer interfacing
  • Control of industrial equipment



Async Communication Channels
Supported Protocols RS232 & RS422
Number of Ports (4) RS232
(4) RS422
Connector 68 pin SCSI
Supported RS232 Signals RTS, CTS, TXD, RXD, DCD, DTR, DSR, RI
Supported RS422 Signals RTS+, RTS-, CTS+, CTS-, TXD+, TXD-, RXD+, RXD-; all signals are differential pairs
Supported RS485 Signals 2-wire mode: TXD/RXD (half duplex), CTS, RTS
4-wire mode: TXD, TXD/RXD (half duplex), CTS, RTS
Differential levels
UART 16550, one per port. Interrupts from each UART can be mapped to any of the four INTA – INTD PCI interrupt lines.
Maximum Baud Rate 115K
RS433 / RS485 TERMINATION 150 ohm for each differential pair
Operating Temperature +5° C to 50° C
Storage Temperature -20° C to 60° C
Humidity (Non Condensing) 5% to 90% @ 40° C
Size 3U cPCI
Weight 200 g


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