XMC Mezzanine Module • Dual Isolated EIA/TIA-485 Asynchronous Interfaces

The DU1-MUSTANG is a XMC standard single-width mezzanine card, equipped with a PCI Express® to dual-UART bridge. Two 16Mbps RS-485 balanced line transceivers with internal 5kV isolation barrier provide for optimum noise and EMC immunity. The front bezel D-Sub connectors withstand up to 250VAC measured against shield.
The 950-style UARTs (COM ports) are compatible with any asynchronous serial application. Certified device drivers are available for Windows®. The 16Mbps EIA/TIA-485 transceivers can be configured for full-duplex operation (4+1 wire cable) or half-duplex (2+1 wire cable), either point-to-point or multipoint applications. The DU1-MUSTANG is equipped with the PLX OXPCIe952 single chip PCI Express® to UART bridge, which is suitable for asynchronous baud rates up to 15Mbps. According to the RS-485 transmission line standard, only the UART receive and transmit data signals are in use, and in addition DTR as RS-485 driver enable control for half-duplex and multipoint configurations.
Two ADM2682E transceivers are provided to meet the RS-485 physical layer specifications. The RS-485 signals of both serial ports are isolated from the board circuitry, and also isolated from each other. Due to the D-Sub connector specification, a maximum of 250VAC between the RS-485 signals measured against shield (front bezel) must not be exceeded.

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  • Form factor XMC single-width mezzanine card 139mm x 74mm
  • Stack height 10mm XMC to host
  • Host I/F Connector P15 XMC – PCI Express, single lane, single link
  • Option P15 connector according to XMC 2.0 (white housing)
  • +3.3V operated (VPWR not in use)
  • PCI Express® bridge to dual-port UART
  • PLX Oxford 950 UART w. 128-byte transmit/receive FIFO
  • Asynchronous baud rates up to 15Mbps
  • Windows® & Linux device driver support
  • 5kV rms isolation barrier RS-485/RS-422 transceivers (Analog Devices)
  • Configurable as half or full duplex
  • ±15 kV ESD protection on RS-485 input/output pins
  • Data rate 16 Mbps
  • Connect up to 256 nodes on one bus (driver enable control via DTR)
  • Open- and short-circuit, fail-safe receiver inputs
  • High common-mode transient immunity >25 kV/µs
  • Thermal shutdown protection
  • Two front bezel male 9-pin D-Sub connectors
  • RS-485 ports isolated against each other and board circuitry (limited to 250VAC by D-Sub connector characteristics)
  • On-board DIP-switches for full/half-duplex setting, and line termination on/off

Simplified Block Diagram

du1 blk
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