EKF - Short Profile
EKF - Short Profile


CompactPCI® • Quad Isolated RS-232 Interface

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RJ45 Pin Assignment

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CompactPCI® Classic  •  Quad Isolated RS-232 Interface

Proven and reliable, RS-232 stays a popular point-to-point low power communication interface.

The CUE-BALLAD is a peripheral slot card for CompactPCI® systems, equipped with four front panel RS-232 ports, available through RJ45 jacks. Isolation barrier transceivers are provided for optimum noise and EMC immunity up to 460kbps data rate, as required for industrial use and operation in harsh environments.

The CUE-BALLAD is based on an octal PCI Express® to UART bridge. The 950-style UARTs are compatible with many asynchronous serial applications and protocols. While four ports are available via RJ45 front panel jacks across isolated transceivers conforming to TIA/EIA-232-E and ITU-T V.28 specifications, another four UART channels are wired to the CompactPCI® backplane connector J2, as TTL level signals for rear I/O usage up to 15Mbps data rate per port.


CUE-BALLAD - Isolated RS-232
Summary of Features

  • PICMG® CompactPCI® Classic (CPCI 2.0) peripheral slot card
  • Single size Eurocard 3U 4HP 100x160mm2
  • Suitable for CompactPCI® peripheral slot
  • CompactPCI® backplane connector J1 for PCI® 32-bit 33/66MHz support
  • Option CompactPCI® backplane connector J2 for rear I/O (4 x UART RX/TX CTS/RTS TTL level signals)
  • On-board PCI® to PCI Express® bridge
  • Option +5V only power supply

  • Pericom® PCI Express® quad UART PI7C9X7958
  • High performance 950-class UARTs
  • 16C550 software compatible
  • 128-Byte FIFO for each transmitter/receiver
  • Baud rate up to 15Mbps
  • XON/XOFF in-band flow control
  • CTS/RTS or DSR/DTR out-of-band control
  • Data frame 5, 6, 7, 8 and 9 bits
  • Clock prescaling 4 to 46
  • Windows® & Linux device driver support

RS-232 Transceivers
  • 2.5kV Isolation barrier RS-232 transceivers (Analog Devices isoPower)
  • Transceivers meet EIA/TIA-232-E specifications/li>
  • High data rate up to 460kbps
  • ±15 kV ESD protection on RS-232 input/output pins
  • High common-mode transient immunity >25 kV/µs
  • Suitable for high noise data communications and diagnostic ports
  • RS-232 front ports isolated against each other and board circuitry
  • 4 x front panel RJ45 connectors 8-lead, two different pin assignments available by order:
    • RJ45 CUE-BALLAD native pin order allows use of low cost Ethernet T/P crossover patch cables
    • RJ45 CU4-SOPRANO legacy pin arrangement for seamless changeover of applications
  • Option 2 x D-SUB9 front panel connectors on request (4HP, 2 x micro ribbon flat cable assembly)
  • Option 4 x D-SUB9 front panel connectors on request (8HP, 4 x micro ribbon flat cable assembly)

Environment, Regulatory
  • Designed & manufactured in Germany
  • Certified quality management according to ISO 9001
  • Long term availability
  • Rugged solution (coating/sealing available on request)
  • Custom specific modifications on request
  • RoHS compliant
  • Operation temperature -40°C to +85°C (industrial temperature range)
  • Storage temperature -40°C to +85°C, max. gradient 5°C/min
  • Humidity 5% ... 95% RH non condensing
  • Altitude -300m ... +3000m
  • Shock 15g 0.33ms, 6g 6ms
  • Vibration 1g 5-2000Hz
  • MTBF 34.7 years
  • EC Regulations EN55022, EN55024, EN60950-1 (UL60950-1/IEC60950-1)

CUE-BALLAD Simplified Block Diagram

CUE-BALLAD Simplified Block Diagram

CUE-BALLAD (D-Sub Front I/O)

CUE-BALLAD • Option D-Sub Front I/O

The CUE-BALLAD is equipped with the Pericom PI7C9X7958 PCI Express® octal UART, which is suitable for asynchronous baud rates up to 15Mbps. Four UART channels are wired to RJ45 front panel jacks across RS-232 transceivers. Each port is comprised of the receive and transmit data signals (RXD, TXD), and in addition two hardware handshake signals (CTS, RTS) which may be used to control the data stream in order to avoid buffer overflow or underrun, as an alternate method to software control by X-ON/X-OFF characters.

Four ADM3252E transceivers are provided to meet the RS-232 physical layer specifications. The RS-232 signals of any particular RJ45 front panel jack are isolated from the board circuitry, and also isolated from each other port. Two pin assignments are available for the RJ45 jacks, a CUE-BALLAD native alignment which is optimized for low-cost Ethernet crossover patch cable usage as RS-232 connection between two CUE-BALLAD equipped systems, and a legacy CU4-SOPRANO layout.

As an alternate to the RJ45 jacks, four 2.54mm pitch pin headers PU1-4 can be optionally populated on-board, for attachment of classic D-Sub 9-pin connectors by means of micro ribbon flat cables, to be combined with a non-standard 8HP width front panel.

The CUE-BALLAD can be configured also for rear I/O usage. Four UART ports are wired as TTL level signals to the optional backplane connector J2, for use with a suitable RIO PHY module, typically configured as either RS-232 or RS-485. Hence, with both front and rear I/O capabilities utilised, the CUE-BALLAD is a true 8-port asynchronous serial interface solution.

As an alternate to J2 RIO, optional 2.0mm pitch shrouded headers PU5-8 can be provided for attachment of CU-series PHY modules.
Ordering Information
Please refer to List 20 for popular SKU
EKF is an ISO-9001 certified company
EKF Elektronik GmbH • Philipp-Reis-Str. 4 • 59065 Hamm • Germany
Phone +49 (0)2381/6890-0 • Fax +49 (0)2381/6890-90 • E-Mail