Motorola MVME705B 6U VME 6-Channel Isolated Serial Transition Slave Module (IndustryPack Carrier I O Board)

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    • Product Code: MVME705B
    • Availability: In Stock
    Motorola MVME705B 6U VME 6-Channel Isolated Serial Transition Slave Module (IndustryPack Carrier I/O Board)
    Manufacturer: Motorola Computer Group, later Emerson Artesyn / Abaco Systems
    Model: MVME705B (B = 2nd revised hardware revision, enhanced ESD & surge protection)
    Series Position: Standard serial communication expansion transition board for full MVME VME SBC family (MVME162, MVME5100, MVME5500), dedicated serial field I/O for Honeywell TDC3000 DCS racks
    Type: Single-height 6U VMEbus slave-only module, A16/D16 addressing, IndustryPack IP serial carrier with galvanically isolated serial channels
    Core Function: 6-channel multi-standard serial signal acquisition & transmission for DCS field transmitters, analyzers, third-party PLCs; hardware isolation, high baud rate support, interrupt-driven/DMA serial data transfer, full front-panel diagnostic LEDs; compatible with VxWorks OS for Motorola VME embedded platforms
    1. Product Overview
    MVME705B is a dedicated VME serial transition slave board designed to expand serial communication ports on Motorola VME single board computers, widely deployed in legacy Honeywell TDC3000 distributed control systems as field serial signal interface. It carries six independent galvanically isolated serial channels, each software configurable to RS232, RS422 or RS485 multi-drop bus mode, eliminating ground loop interference between cabinet host and on-site field instruments. The B hardware revision upgrades transient surge suppression, adds multi-stage power filtering and reinforced channel isolation compared to original MVME705. Front panel integrates three DB25 connectors to route all six serial channels to field wiring terminals; rear P2 VME connector links directly to the IndustryPack expansion slot of the host SBC (MVME162 series carry four native IP slots, MVME5100/MVME5500 use PMC-to-IP adapters for compatibility). All serial circuits support hardware/software flow control, high-speed baud rates up to 921.6kbps, and edge-triggered receive interrupts to reduce host CPU polling overhead. Built-in per-channel fault detection, power-on self-test (POST) and status LED indicators simplify on-site DCS cabinet maintenance, suitable for petrochemical, thermal power and offshore control rack serial communication expansion.
    2. Complete Technical Specifications
    • VME Bus Mode: Slave only, VMEbus Rev C.1, A16 short address space, D16 16-bit data width, configurable IRQ 1~7 interrupt levels
    • Serial Channel Quantity: 6 fully independent isolated serial UART channels
    • Serial Standard Per Channel: Software selectable RS232 / RS422 / RS485 2-wire/4-wire multi-drop
    • Baud Rate Range: 50 bps ~ 921.6 kbps programmable, standard industrial baud rates fully supported
    • Serial Frame Parameters: Data bits 5/6/7/8; Stop bits 1/1.5/2; Parity None/Odd/Even; Flow Control XON/XOFF software / RTS/CTS hardware
    • Channel Isolation Rating: 2500VAC rms galvanic isolation between each serial channel and VME logic ground
    • Surge & ESD Protection: ±15kV contact ESD, ±25kV air ESD, 2kV line surge on all field serial ports, reverse polarity protection
    • Front Panel I/O: Triple DB25 female connectors for six serial field wiring; Power, VME ACTIVE, RX/TX channel status multi-color LED indicators
    • Diagnostic Functions: Power-on self-test (POST), per-channel open/short circuit fault detection, interrupt error logging
    • Power Supply: +5VDC VME backplane main power; typical power consumption 6.5W, max 12W full channel load
    • Operating Temperature: Standard industrial grade 0℃ ~ +55℃ forced air cooling; storage temperature -40℃ ~ +85℃
    • Humidity: 5% ~ 95% RH non-condensing, UL/CE/CSA certified
    • Mechanical Form Factor: Single-height 6U VME Eurocard, 233.4mm(H) × 160mm(W) × 20mm(D), single chassis slot occupancy
    • Compatible Host SBC: MVME162 full series, MVME5100, MVME5500; Supported RTOS: VxWorks 5.x / 6.x
    3. MVME705 vs MVME705B Hardware Upgrade Differences
    1. MVME705B adds multi-stage LC power filter circuits to suppress VME switching noise and cabinet EMI interference
    2. Reinforced isolation transformers increase channel isolation margin for harsh high-noise DCS cabinet environments
    3. Upgraded transient suppression diodes improve surge withstand capability for offshore and power plant field wiring
    4. Optimized PCB trace layout reduces serial crosstalk at maximum 921.6kbps baud rate
    5. Core UART logic, serial channel quantity and VME bus interface circuit remain identical between two revisions
    4. Core Industrial & DCS Application Scenarios
    • Honeywell TDC3000 DCS LCN rack serial communication expansion: connect field flow/temperature transmitters, gas analyzers, third-party PLC slave stations via RS485
    • Thermal power plant boiler & turbine VME control cabinet serial instrument data acquisition
    • Petrochemical refining distributed control multi-drop RS485 bus field communication interface
    • Aerospace ATE automated test bench serial instrument control & data logging
    • Railway signal cabinet serial interlock device communication expansion module
    Motorola / Emerson © MVME705B VME Isolated 6-Channel Serial Transition Module


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