FASTCOM G422/4-PCIe

Fastcom G422/4-PCIe Asynchronous card RS422/485 
Four independent RS422 / RS485 channels

The Fastcom PCIe Bus, Asynchronous RS422/485 adapter utilizes the latest technology to live up to today’s requirements for high bandwidth in communication systems. The Fastcom: G422/4-PCIe is capable of operating at virtually any baud rate up to an astounding maximum serial data rate of 25 Mbit/s. There is no fine print or asterisks pointing to notes; this card is capable of running at the maximum data rate, without any jumpers or hardware changes, right out of the box.

The Fastcom: G422/4-PCIe adapter utilizes an advanced quad Universal Asynchronous Receiver and Transmitter (UART). Each channel of the 17V354 UART is independently controlled and has its own 16C550 compatible register set. Each UART contains its own receive and transmit FIFO’s of 256 bytes, each with programmable trigger levels.

Each of the four UART channels on the board can be independently configured as either RS-422 or RS-485 for full or half-duplex communication. This is implemented using an automatic RS-485 transmitter enable/disable function that permits the hardware itself to regulate data flow by only driving lines while actively transmitting. This provides increased speed and convenience over the older software controlled method, while still allowing the use of the software method of flow control. Optionally, in automatic RS-485 mode, the receiver can be disabled during transmits to avoid a receive echo, common in 2-wire 485 networks.

With the supplied software driver, the ports on the Fastcom: G422/4-PCIe will be seen as standard COM ports and can utilize all the same functions as a standard serial device. With the addition of a few simple I/O commands to control the unique features of the board, the standard software interface to a serial port can be used to simplify program design. Example C programs are provided to demonstrate how to effectively use serial interface as well as control the board specific features.

Overall, the Fastcom: G422/4-PCIe PCIe Bus RS-422/485 adapter is the ideal board for commercial and industrial applications demanding high data rates, reliability and ease of use.

RoHS 3 2015/863/EU Compliant
UART: EXAR 17V354(Data Sheet)
INTERFACE: RS422 / RS485
CONNECTOR CONFIGURATION: Cable assembly (2 ft.) – CHAMP 68 VHDCI to four DB9 receptacles
SIGNALS: TX+, TX–, RX+, RX–, RTS+, RTS–, CTS+, CTS–
BUS INTERFACE: PCIe x1 Gen 2.0
BAUD RANGE: All standard PC baud rates; easily select any non-standard baud rates
from 1 bps to 25 Mbit/s
Maximum data rates are estimates. They are greatly affected by a number of different factors. See the data rates section of the manual for more details. This is possible as long as the operating parameters are within reason. If you have any question about whether the card can meet your needs, please contact Technical Support.
POWER REQUIREMENTS:
+3.3V 125mA (typical)
+12V 150mA (typical)
ENVIRONMENT:
Operating Temperature Range: 0 to 70 C
Humidity: 0 to 90% (non-condensing)

Four independent RS422 / RS485 channels
Excellent line noise immunity
Cable lengths up to 4000 feet
RS485 Mode:
Up to 32 stations on same “twisted-pair” network
Line driver control:
Automatic control of line drivers under special UART mode using RTS SIGNAL
RX echo cancel in hardware for 2 wire 485
Termination resistors controlled by software (no board modification required)
High performance 17V354 UART
All standard and non-standard baud rates up to 25 Mbit/s
Features on-board clock generator to attain non-standard rates without modifying the hardware or changing the clock
256 byte FIFOs for improved through-put
256-byte RX FIFO with programmable level control
256-byte TX FIFO with programmable level control
Durable Cable and RFI shielding
Cable assembly: VHDCI 68 plug to four DB9 receptacles (2 ft.)
Other cable configurations available upon request
Cable, documentation, and software drivers included