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Revision as of 11:27, 8 September 2015 by Maxim (Talk | contribs) (Hardware Specifications)

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FM-SER Module

FM-SER FACE Module provide various serial connectivity solution and compatible with several Compulab systems. Refer to Compatibility Matrix for products fit.


  • High performance UARTS
  • Asynchronous baud rates up to 15Mbps
  • 128-byte deep TX/RX FIFOs
  • Advanced FIFO fill management
  • RS232, RS485, RS422 operation
  • Programmable RS485 turn-around delay
  • 450 through 950 software compatibility
  • Two independent CAN bus controllers implement CAN V2.0B at rate of up to 1Mbps each
  • Isolated PHY with rated isolation voltage of 2.5 kV RMS
Connectivity Specifications
RS232 / RS485 / RS4221 6x RJ-11 jacks functioning as RS2322, as half3/full-duplex RS485 or RS422 serial ports;
CAN bus 2x RJ-45 jacks functioning as an isolated Controller Area Network (CAN) bus


  1. The default standard can be configured by jumper E1. See section Serial Ports Configuration.
  2. FM-SER is classified as DTE (Data Terminal Equipment) in terms of RS232 standard definition.
  3. RS485 half-duplex mode requires special HW/SW adaptation

Block Diagram


Hardware Specifications

The following section provides information about the main components and respective features, as well as available configuration options.

PCIe to UART Bridge PLX OXPCIe958

  • UART bridge – from PCIe to 8 serial ports 1
  • Eight 128-byte transmit and receive FIFO unit
  • Integrated DMA controller
  • Asynchronous data rate of up to 15.625 Mbp
Notes:   FM-SER utilizes 6 serial ports

LTC2872 Dual Multiprotocol Transceiver

  • Three dual transceivers are onboard the FM-SER provide 6 multiprotocol serial ports.
  • Implementation of physical layer (PHY) of RS232 or RS485 serial protocol ports.
  • Up to 500kbps data rate from UART to RS232 and up to 15 Mbps data rate to full duplex RS485
  • Supports RS422 and half duplex RS485 protocols
  • Integrated termination resistors are being switched according to mode of operation.
  • Loopback mode for self-testing

CAN Bus Controller MCP2515

  • Connected to SPI bus originated from a USB to SPI bridge
  • Two CAN bus controllers implement CAN V2.0B at rate of up to 1Mbps each.
  • Six 29-bit filters, two 29-bit masks and two receive buffers with prioritized message storage
  • Interrupt outputs from CAN bus controllers and a shared reset input are connected to the host motherboard.

CAN PHY ADM3053 (Isolation Driver)

  • Isolated physical layer (PHY) transceiver with rated isolation voltage of 2.5 kV RMS for 1 minute
  • Data rate of up to 1Mbps
  • Consumers power from the CAN bus by default, and can be configured to supply power of up to 170 mA to the bus.

RJ-11 Serial Ports
The serial ports are arranged as COM ports differently on different motherboard configurations, as detailed in Table 2. The physical locations of the ports are depicted in Figure 1.

Serial Ports Arrangement

Motherboard P1 P2 P3 P4 P5 P6
fit-PC3/ SBC-fitPC3 9 8 5 4 7 6
Intense-PC/ SBC-iSB 10 9 6 5 8 7

RJ-11 Pinout

RS232 1 RS485 2
Pin # 3 Type Functionality Type Functionality
2 - GND - GND
3 O TX O TX+
4 I RX I RX+
5 - GND - GND





SW Drivers