Technobox, Inc. | PMC/XMC Boards & Embedded Solutions
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PMC

Technobox, Inc. offers a variety of mezzanine board solutions for supplemental I/O used in embedded systems. Designs address a spectrum of possible applications - from a discrete single-width convection-cooled PMC with 4 ports - each selectively configured as RS-232, RS-422 or RS-485 - to a unique family of XMCs featuring mix-and-match modularity, from which a collection of 4, 8 or 16-port I/O modules can be built and delivered with limited lead times.

 
 
 

Triple-Isolated RS232/RS485/RS422 PMC w/ 3.3V or 5V Signaling, 32b, 33 MHz (5751)

Triple-Isolated RS232/RS485/RS422 PMC w/ 3.3V or 5V Signaling, 32b, 33 MHz (5751)

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Our Triple-Isolated RS232/RS485/RS422 PMC with 3.3V or 5V Signaling, 32b, 33 MHz (5751) is a cost-effective solution for providing additional serial ports for a host processor. All three ports are accessed via 9-pin Micro D-Subminiature connectors on the PMC front-panel.

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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.

 

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