MOTOROLA MVME335 Single Height 6U VME Multi-Channel Serial & Parallel Communication Interface Slave Board
- Product Code: MVME335
- Availability: In Stock
MOTOROLA MVME335 Single Height 6U VME Multi-Channel Serial & Parallel Communication Interface Slave Board
Manufacturer: Motorola Computer Group, later Emerson Embedded Computing
Model: MVME335 (4-CH Serial + 1-CH Parallel VME I/O Expansion Board)
Product Type: Single-height 6U VMEbus slave-only communication mezzanine board, MVME33x peripheral expansion series
Core Positioning: Multi-channel serial communication expansion card for MVME147/MVME162/MVME172 VME single board computers, dedicated for industrial DCS serial field device connection
Core Function: 4 independent multi-mode serial communication channels (RS232/422/485), 1 Centronics-compatible parallel printer port, hardware FIFO buffer, interrupt-driven data transmission, full channel ESD/surge protection, VME A16/D16 addressing, compatible with all Motorola 68K VME host controllers
1. Product Overview
MVME335 is a standard single-height 6U VMEbus slave communication expansion module developed by Motorola, specially designed to expand multi-channel serial and parallel interfaces for MVME series VME single board computers. It cannot operate independently and must be mounted on the same VME chassis and controlled by a master SBC via VME backplane bus.
This board carries four fully independent serial transceivers supporting RS-232C, EIA-422 and EIA-485 multi-mode switching, each channel equipped with independent hardware FIFO receive/transmit buffers to reduce host CPU interrupt frequency and improve continuous data transmission stability. A dedicated Centronics parallel port is reserved for local printer debugging, log output and peripheral auxiliary communication.
All serial signal circuits integrate ±15kV contact ESD and 2kV surge suppression protection, with isolation resistors on each signal line to restrain industrial ground loop interference. The board adopts A16 short address space and D16 16-bit data width VME bus protocol, supporting maskable per-channel interrupt signals, and can be cascaded with multiple MVME335 boards in one VME rack to expand dozens of serial communication links.
It is widely matched with Motorola VME SBCs to build serial communication networks for thermal power DCS, petrochemical distributed control, railway signal equipment and aerospace automatic test benches, realizing connection with field transmitters, PLC sub-stations, serial printers and serial monitoring instruments.
2. Complete Technical Specifications
• VME Bus Mode: Slave only, IEEE 1014 VME Rev C, A16 short address space, D16 16-bit data width
• Interrupt Control: Configurable VME IRQ level 1~7, independent interrupt mask register for each serial channel
• Serial Channel Quantity: 4 fully independent multi-mode serial ports on front panel DB9 connectors
• Serial Standard Support: RS-232C, EIA-422 full duplex, EIA-485 half duplex multi-drop bus
• Baud Rate Range: 50bps ~ 921600bps programmable per channel
• Serial Data Format: 5/6/7/8 data bits, 1/1.5/2 stop bits, none/odd/even parity check
• Flow Control: Hardware RTS/CTS flow control, XON/XOFF software flow control optional
• Hardware Buffer: Each channel 128-byte TX FIFO + 128-byte RX FIFO for high-speed continuous transmission
• Parallel Port: 1 × Centronics standard parallel printer port via front DB36 connector
• Signal Protection: ±15kV contact ESD, ±25kV air discharge ESD, 2kV field surge protection per channel
• Power Input: +5VDC from VME backplane, typical power consumption 3.2W, max 4.8W full load
• Operating Temperature: Industrial standard 0℃ ~ +60℃ forced air cooling; extended rugged version -40℃ ~ +85℃
• Storage Temperature: -40℃ ~ +85℃; Relative Humidity: 5% ~ 95% RH non-condensing
• Mechanical Dimension: Single-height 6U VME Eurocard, 233.4mm(H) × 160mm(W) × 20mm(D), weight approx 235g
• Compatible Host SBC: MVME147, MVME162, MVME172, MVME5100, MVME5500 series VME master controllers
• Supported RTOS: VxWorks, pSOS, LynxOS, Embedded Linux with dedicated serial driver packages
3. Core Hardware Advantages
1. Four independent serial channels with separate transceiver chips, no cross-channel signal crosstalk interference
2. Large-capacity hardware FIFO buffer reduces CPU interrupt burden, supporting long-term high-speed serial data acquisition
3. Three standard serial electrical interfaces integrated on one board, freely switched via software without hardware modification
4. Complete surge and electrostatic protection circuit, adapting to harsh electromagnetic interference industrial cabinet environments
5. Standard front-panel DB9/DB36 connectors, convenient field wiring and equipment maintenance without opening VME chassis
4. Typical Application Scenarios
• Thermal power plant DCS serial field instrument communication expansion board
• Petrochemical refining system multi-drop RS485 bus field device connection module
• Aerospace ATE test bench multi-channel serial instrument data acquisition card
• Railway signal cabinet serial interlock auxiliary communication expansion unit
• Industrial automation distributed control system serial printer and HMI peripheral interface expansion
MOTOROLA / Emerson © MVME335 6U VME Multi-Channel Serial Parallel Communication Slave Expansion Board