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M77 - Quad RS232/RS422/RS485 UART

M-Module

The mezzanine card M77 is a quad serial interface M-Module which supports four high-performance UARTs with RS232 or RS422/485.

  • M77 Product ImageM77 Quad RS232/RS422/RS485 UART
  • M77 Product Image

Main Features

  • 4 high-performance UARTs
  • 128 bytes FIFO buffer
  • Serial data rates up to 1.152 Mbit/s
  • Software programmable 
  • Full and half duplex on 4 channels
  • 500 V DC optical isolation
  • 180 V DC isolation between channels
  • -40 to +85°C screened versions
M77 Product Image

Technical Data

Quad RS232/485/422 Interface
  • All 4 channels with 4 lines (no handshake lines)
  • All 4 channels electrically isolated from the system and from each other
UART Controller
  • 4 independent full-duplex asynchronous 16C950 high performance UART channels each
  • 128-byte FIFO for each transmitter and receiver
  • UARTs fully software compatible with industry standard 16C55x type UARTs
  • Data rates up to 1.152 Mbit/s
  • Readable FIFO levels
  • Automated in-band flow control using programmable Xon/Xoff characters, in both directions
  • Arbitrary trigger levels for receiver and transmitter FIFO interrupts
  • Programmable special character detection
  • 5-, 6-, 7-, 8- and 9-bits data framing
  • Detection of bad data in receiver FIFO
  • Independent channel reset by software
  • Transmitter and receiver can be disabled
  • Transmitter idle interrupt
  • Sleep mode (low operating current)
Peripheral Connections
  • Via front panel on a shielded 25-pin D-Sub receptacle connector
  • Via carrier board (rear I/O)
M-Module Characteristics
  • Compliant with M-Module standard
  • A08, D08, INTA, IDENT
Electrical Specifications
  • Isolation voltage:
    • 500V DC between isolated side and digital side
    • 180V DC between the channels
    • Voltage between the connector shield and isolated ground is limited to 180V using a varistor; AC coupling between connector shield and isolated ground through 47nF capacitor
  • Supply voltage/power consumption: +5V (4.85V..5.25V), 200mA typ.
  • MTBF: 272,598h @ 40°C according to IEC/TR 62380 (RDF 2000)
Mechanical Specifications
  • Dimensions: conforming to M-Module Standard
  • Weight: 67g
Environmental Specifications
  • Temperature range (operation):
    • 0..+60°C or -40..+85°C
    • Airflow: min. 10m³/h
  • Temperature range (storage): -40..+85°C
  • Relative humidity range (operation): max. 95% non-condensing
  • Relative humidity range (storage): max. 95% non-condensing
  • Altitude: -300m to + 3,000m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10..150Hz
  • Conformal coating on request
Safety
PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers
EMC
Tested according to EN 55022 (radio disturbance), IEC1000-4-2 (ESD) and IEC1000-4-4 (burst)
Software Support
  • Linux
  • VxWorks
  • QNX
  • OS-9
  • For more information on supported operating system versions and drivers see Software.

Ordering Information

Standard M77 Models
04M077-00

4-channels RS232/RS485/RS422, optically isolated UART, 0..+60°C

04M077-01

4-channel RS232/RS485/RS422, optically isolated UART, -40..+85°C screened

Software

Linux
13M077-90

Linux TTY driver (MEN) for M77, M45N and M69N, source code

VxWorks
13M077-60

VxWorks driver (MEN) for M77, M45N and M69N, source code

QNX
13M077-40

QNX native driver (MEN) for M77, M45N and M69N

OS-9
13M077-01

OS-9/68k SCF driver for M77

13M077-02

OS-9/PPC SCF driver for (MEN) M77, M45N and M69N, source code

Application Examples

Power Automation

3U CompactPCI systems are used as the computing heart of a station master system on the plant control level.