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Application Notes



The CNOS-001 is a serial port expansion module for Schneider Automation's TSX Compact PLC. It takes advantage of the new Compact communication channel. The module gives the Compact two additional serial ports that are switch-selectable RS-232 or RS-485. It is configurable as either an option module or an I/O module.

Gateway, Router & Protocol Converter

The CNOE-800 is simultaneously a router, and a protocol converter. Internally, the CNOE-800 has 3 ports: the two serial ports, and the PLC "port" (via backplane comms). The serial ports speak Modbus RTU or ASCII (master or slave), SY/MAX, PLOGIC, RNIM, mixed Modbus/SY/MAX, and others. Messages from any of the three ports can be routed out any other port. As messages move between the ports they are translated from one protocol to another. Using an MSTR instruction, the PLC can issue:

  • 0x, 1x, 3x, and 4x MSTR reads via a serial port.
  • 0x and 4x MSTR writes via a serial port.
  • SY/MAX, PNIM, RNIM reads and writes via serial port.
  • Configuration commands to the CNOE.

The two serial ports have RJ45 connectors and are independently swich-selectable RS-232 or RS-422/485. Ports are independently configurable as to mode, baud rate, and etc. External serial devices can:

  • Read or write PLC registers.
  • Program the PLC.
  • Read or write Modbus, SY/MAX, or PowerLogic devices the other serial port.
    • Even program serial Modbus or SY/MAX PLCs.
  • Configure the CNOE.


  • TSX Compact PLC (-258, -265, -275, -285 only).
  • Free slot in the main rack (slots 3, 4, or 5).
  • Compact PLC Executive version 2.07 or greater. The Compact Executive required for the CNOS-001 is now available at Schneider Automation's website.


Multiple CNOEs can work in a single rack. No web pages are served by this module. Modules come with a user manual and configuration software on CD, 1-year warranty and 1-year free firmware upgrades.


The CNOS-001 is available as: CNOS-001 with two serial ports.

Effective 14 May 2004 - Specifications subject to change without notice.