VMIC VMIVME-5740-12 000 Serial Communication Board

Module Feature

VMIVME-5740-12 000 is a single-slot 6U VMEbus multi-port isolated serial module developed by VMIC (GE Fanuc / Abaco Systems). It integrates 12 independent serial channels; each port can be software configured to RS232, RS422 or RS485, supporting 2-wire or 4-wire RS485 half-duplex / full-duplex mode. Baud rate ranges from 300 bps up to 921.6 kbps, every channel equipped with 512-byte TX FIFO and 512-byte RX FIFO to reduce VME CPU interrupt load. 2500 Vrms galvanic isolation exists between serial field side and VME digital bus, effectively suppressing common-mode noise and ground loop interference in long-distance wiring. VME bus interface supports A16/A24/A32 addressing and D08/D16/D32 data transfer, supports VME interrupt and DMA function, can work as VME slave. Onboard surge and ESD protection on each serial port safeguards against field transient voltage. Rugged Eurocard PCB with conformal coating,shock and vibration screened for power plant cabinet environment,widely used in gas/steam turbine field sensor serial communication,aerospace ground test bench,industrial distributed serial data collection and legacy VME chassis retrofit.

Working principle

VME host configures serial protocol,baud rate and parity parameters via VME register. UART controller receives and transmits serial data, FIFO buffer stores incoming/outgoing data to avoid data loss under high-speed transmission. Isolation barrier separates field serial signals and VME digital domain. When data arrives,module asserts VME interrupt to notify host for data reading. VME FPGA completes address decoding,bidirectional data handshake and interrupt control between VME backplane and UART array. Port protection circuit clamps surge voltage to prevent UART chip damage.

Onboard components

VME interface FPGA,12 channel UART array,512B TX/RX FIFO per channel,2500 V isolation transformer network,serial surge & ESD protection circuit,protocol configuration register bank,VME J1/J2 edge connector,front-panel multi-pin field serial I/O connector,multi-status LED array.

LED indicators

Front panel LED indicators for board +5 V power and serial channel activity.

Hardware self-diagnosis

Visual inspection of PCB,components and solder joints;board ID register readback verification;loopback test for every serial port;baud rate & parity verification;VME A32 bus communication test.

Programming software

VMIC serial I/O driver library and configuration utility,supports VxWorks,Linux and QNX real-time operating systems;software tool for port protocol setup and serial data read/write.

Electrical & Process Parameters

Model: VMIVME-5740-12 000 Brand: VMIC Device type: 6U VMEbus 12-channel galvanic isolated serial communication module Bus standard: VMEbus, A16/A24/A32 addressing, D08/D16/D32 transfer,interrupt & DMA support Channel:12 independent serial ports Protocol:Software selectable RS232 / RS422 / RS485(2/4 wire) Baud rate:300 bps ~ 921.6 kbps FIFO:512 B TX / 512 B RX per port Isolation:2500 Vrms between serial port and VME bus Control mode: VME slave access,per-port FIFO buffer,software protocol configuration,2500 V galvanic isolation,ESD & surge protection Power supply: +5 V from VME backplane Cooling: Convection cooling Protection: Per-port surge protection,ESD protection,galvanic isolation Mounting: Standard single-height 6U VME front panel ejector locking Protection class: PCB with optional conformal coating

Mechanical & Structure

Mounting: Single-slot 6U VME Eurocard Protection class: PCB with optional conformal coating

Environmental

Operating temperature:0℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification: CE compliant Status: VMIC 6U VME 12-port isolated multi-protocol serial board

Installation

Follow ESD safety procedure before handling.Fully power off VME chassis.Insert VMIVME-5740-12 000 into vacant 6U VME slot and lock front panel ejector latches.Connect field serial devices to front multi-pin I/O connector.Power on chassis,load VMIC serial driver,run per-channel loopback test before commissioning.

Interface

VME J1/J2 backplane connector,front-panel multi-pin serial field I/O connector,interrupt and fault status register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or incorrect VME interrupt assignment. Serial communication garbled: baud rate/parity mismatch or ground loop noise. Port no receive/transmit: damaged UART or isolation circuit fault. Random data error: missing shielding or surge damage on field wiring.

Product Brief

VMIC VMIVME-5740-12 000 single height 6U VME multi-protocol serial board,12 isolated RS232/422/485 ports up to 921.6 kbps with 2500 V galvanic isolation,for turbine field serial sensor communication and aerospace ground test VME systems.