Product Information

The Technobox, Inc. P/N 5751 3-Port Isolated Async Communications Adapter is a cost-effective solution for providing additional RS232/RS422/RS485-based serial ports for a host processor. Each port is independently set-up by Technobox, Inc. to operate at either RS232 or RS422 levels. In the RS422 case, an additional option is provided to transmit data on the receive data line in an RS485 fashion. Please specify your port configuration when ordering. When configured for RS232 mode, a port provides the full set of data and modem control lines - RTS, CTS, TXD, RXD, DCD, DTR, DSR and RI. When configured for RS422 mode, a port provides TXD, RXD, CTS and RTS, each operating at RS422 differential levels with uni-directional drive.

The RS485 mode supports both 2-wire and 4-wire RS485 connections. In 2-wire mode, a single differential RS422 driven pair carries transmit or receive data in a half-duplex fashion. For 4-wire mode, the TXD is also driven on an additional RS422 unidirectional output. Control of transmit/receive direction is accomplished via the RTS control signal from the 16650 UART, as is customarily done for RS485 applications. Options to terminate the differential RS422/RS485 signals with 150-ohm parallel termination are provided by the design. Please specify your termination requirements on order.

All three ports are accessed via 9-pin Micro D-Subminiature connectors on the PMC front-panel. Independent isolation is provided for each port using a separate isolated DC-to-DC converter and opto-isolators for conveying I/O signals. This implementation provides 500V RMS of electrical isolation. Switches on the board direct the interrupts from each port to the desired INTA/INTB/INTC/INTD request on the PCI bus. Any combination of connection to the INTx lines is possible, thereby supporting shared and non-shared interrupt requests.

Related Products

• Cable Assembly (10.0 ft) 68-Pin SCSI Terminations w/ Jackscrews (5912)

• Cable Assembly (6.0 ft) 68-Pin SCSI Terminations w/ Jackscrews (5911)

• Cable Assembly (3.0 ft) 68-Pin SCSI Terminations w/ Jackscrews (5910)

• Cable Assembly (1.5 ft) 68-Pin SCSI Terminations w/ Jackscrews (5909)

• PMC-to-PCI Express Adapter - 1X (5243)

• 8-Position DB-9 Male Transition Panel w/ 68-Pin SCSI Connector on Each Side of Panel (5100)

• 8-Position DB-9 Male Transition Panel w/ SCSI Connector on Opposite Side of Panel (4988)

• PMC-to-PCI Adapter 64-Bit (4954)

• PMC-to-PCI Adapter 64-Bit 33 MHz (4930)

• PMC-to-PCI Express Adapter - 1X (4749)

• PMC-to-PCI Express Adapter - 4X (4733)

• PMC Socket Saver (4690)

• Transition Panel w/ 16 RJ45 Connectors (3301)

• 68-Pin Generic Rear I/O PCI Interface Module (PIM) (3190)

• 64-Contact Discrete Wiring Transition Panel (1868)

• 16-Position RJ11 Modular Jack Transition Panel (1866)