Description
The GX3903 is a 3-port, cPCI asynchronous communications interface board supporting RS-232, RS-422, and RS-485 interfaces. Each port is configured at the time of order for RS-232, RS-422 or RS-485 signaling. The default configuration is RS-232. For RS-232 mode, each port supports RTS, CTS, TXD, RXD, DCD, DRC, DSR, and RI signaling. The RS-422 mode supports TXD, RXD, CTS, and RTS with each line operating differentially with a uni-directional drive.
In RS-485 mode, the card supports both 2-wire and 4-wire configurations. In 2-wire mode, a single differential RS-422 pair operates in half-duplex mode. For 4-wire mode, the TXD is driven on an additional RS422 uni-directional output. Control of the Tx/Rx direction is performed via the RTS control signal from the 16550 UART.
Features
The differential RS-422 / RS-485 ports are terminated with 150 ohm parallel terminations. Alternate terminations can be specified at time of order. Interfacing to the 3 ports is provided via (3) front panel mounted Micro D9 connectors.
Support for each port is provided by a 16550 UART which operates at data rates up to 115 K baud. Mapping of interrupts, INTA/INTB/INTC/INTD from the PCI bus to each UART is done via switches located on the board, supporting both shared and dedicated interrupt requests.
Software
Standard Windows COM drivers can be used with the GX3903.
Applications
- Automatic Test Equipment (ATE)
- Control of computer peripherals
- Computer to computer interfacing
- Control of industrial equipment
GX3903 Series Specifications
| Async Communication Channels |
|---|
| Supported Protocols | RS232, RS422, RS485
Factory configurable. Default configuration is RS232. |
| Number of Ports | 3 |
| Connector | 9-pin, Micro D-subminiature, male |
| Supported RS232 Signals | RTS, CTS, TXD, RXD, DCD, DTR, DSR, RI |
| Supported RS422 Signals | TXD, RXD, CTS, RTS; differential levels, unidirectional drive |
| 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. Configurable interrupts, shared or dedicated. Configurable via on-board DIP switches |
| Maximum Baud Rate | 115 K |
| RS433 / RS485 Termination | 150 Ω, optional |
| Power |
|---|
| 3.3 VDC | TBD |
| 5 VDC | TBD |
| Environmental |
|---|
| 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 |
Note: Specifications are subject to change without notice.
Downloads for GX3903 Series
GX3903DS.pdf
Mar 25, 2024
version: B
131.83 KB
GX3903.zip
Nov 21, 2012
162.42 KB
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Products similar to GX3903 Series
- GX3904 - 4 Port RS-232 & 4 Port RS-422 Interface cPCI Card
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