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XNAIS: NAIS Matsushita MEWTOCOL-COM Protocol Driver v10.0


XNAIS: NAIS Matsushita MEWTOCOL-COM Protocol Driver

General Information:


XNAIS driver allows you to connect to PANASONIC NAIS MATSUSHITA PLCs which support the OPEN MEWTOCOL-COM protocol to communicate with a PC.



  • Master/Slave communication(Half duplex communication)*4

  • ASCII strings (One frame is up to 118 characters.)*5

  • 19200 bps (or 9600 bps *1 *3)

  • 8 bit data length (or 7 bit *2 *3)

  • 1 stop bit fixed *3

  • Odd parity fixed *3

  • Cr (Carriage Return) fixed *3

  • (*1) Dip switch configurable, located next to programming port for FP1, FPM, FP3, FP10SH. For FP0 it is software configurable. The default for FP0 is 9600bps.

  • (*2) Configurable in PLC system register through the programming software (NPST-GR/FPsoft) using the programming port.

  • (*3) Configurable in PLC system register through the programming software (NPST-GR/FPsoft) using the secondary port.

  • (*4) If you want the PLC to send some alarm signals or any other signals while the PLC is a slave use the FP3 CCU module when it's one to one communications or FP3 MEWNET-W. When it's one to N communication, it is duplex communications and has MEWTOCOL-DAT which will allow the PLC to send some command to a master station (computer typically).

  • (*5) If you need to send or receive more than 118 characters in one frame, use the delimiter so that you can ask the PLC to keep sending the continuous data. The other way is that you can keep sending 118 character frame repeatedly as one frame.

  • Here is a list of what this protocol can do.

  • Read one bit ON/OFF info. (Input, Output, Timer, Counter, Internal relay)

  • Read 16 block bits ON/OFF info. (Input, Output, Internal relay)

  • Read multiple word unit data value (DT, FL, LD)

  • Read multiple Timer/Counter preset value

  • Read multiple Timer/Counter elapsed value

  • Set one bit ON/OFF (Output, Internal relay)

  • Set multiple word unit data value (DT, FL, LD)

  • Set multiple Timer/Counter preset value

  • Set multiple Timer/Counter elapsed value



  • FP1 -------- Programming port (RS422) Secondary port (RS232C), configurable by PLC through software

  • FPM ------- Programming port (RS232C) Secondary port (RS232C), configurable by PLC through software

  • FP3 -------- Programming port (RS422)

  • FP10SH -- Programming port (RS232C) Secondary port (RS232C), configurable by PLC through software

  • FP3/FP10SH modules --Computer Communication Unit(AFP3462) (RS232C) Computer Communication Net Unit ( AFP3463) (RS485) Remote Slave Unit (AFP3741, AFP3743) (RS422 port) MEWNET-H (AFP3700) (RS232C, and through the network) MEWNET-W (AFP3720) (Through the network) MEWNET-P (AFP3710) (Through the network) Modbus Unit (AFP3492, AFP3413) (RS232C, RS485)



  • RS232C

  • 19200 bps (or 9600 bps *1*3 )

  • 8 bit data length (or 7 bit *2*3 )

  • 1 stop bit fixed *3

  • Odd parity fixed *3

  • Cr (Carriage Return) fixed *3

  • (*1) Dip switch selectable, located next to programming port.

  • (*2) Configurable in PLC system register through the programming software(NPST-GR) using the programming port.

  • (*3) Configurable in PLC system register through the programming software(NPST-GR) using the secondary port.

  • Computer sends a COMMAND to PLC as an ASCII string. Then the PLC automatically returns the RESPONSE based on the COMMAND. PLC mode (RUN/PROG )does not effect the response. Input information shall be returned as all "0" in PROG mode.


    Available Commands:



    Supported Devices:

    (This list is only indicative and may exist other unlisted equipment that are also communicable with this driver).


    This driver includes:



    Available Downloads:



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