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The Momentum Universal Communications Module (MUCM) is a programmable serial communications module compatible with Schneider Electric’s Momentum PLC. The MUCM is a Momentum specialty base that interfaces with Momentum communication adapters and processors and supports Momentum option adapters. The MUCM is a powerful module that can be used in a variety of stand-alone applications such as serial protocol converter, data logger, or ASCII serial device interface.
The MUCM is available in two formats. The MUCM+302 has one RS-232 serial port and one RS-422/485 serial port. The MUCM+303 has two serial ports, independently switchable between RS-232 and RS-422/485. This feature provides the flexibility to use the MUCM+303 with either port set to RS-232 or RS-422/485, allowing concurrent use of two RS-232 ports, or two RS-422/485 ports, or one of each data level.
The serial ports are electrically isolated, providing protection against ground loops and minimizing potential damage from over-voltage events on the serial networks. The serial protocol of each port is independently configured.
Serial Protocol Converter
Option 1: MRPC Application
• SY/MAX • Gateway • Net-to-Net • Transparent • Peripheral • Share
Option 2: Custom Program For Your Device
For users without programming experience or resources, custom programming by Niobrara engineers is available.
Required elements include the communication protocols for the devices to be attached and access to samples of those devices for test purposes.
For further details on this service, contact Niobrara at
No matter which method you choose, the communication tasks are handled without the addition of a Momentum communication adapter. An empty base cover is available; order part number METH-001.
The MUCM has a real-time clock and Flash memory that allows it to act as a data logger, storing time-stamped data. The logged data can arrive via the serial ports or the communication adapter. Flash memory and EEPROM are available for data storage. Up to 5Mb are available for data storage.
The logged data can be read either from a serial port or from the communication adapter by multiplexing registers through the I/O interface.
Custom programming is required for this feature; contact the factory for an example program.
MUCM Modem Interface
The MUCM operating system includes an Internet Protocol stack with support for a PPP client connection. This allows custom MUCM programs to use a standard external serial modem to dial up a local Internet Service Provider (ISP) and connect to the Internet. The MUCM may then send logged data by email, FTP, or any other TCP/IP protocol. The MUCM can also send emails for alarm conditions to notify you immediately of any problems with your process or application. While the MUCM is connected to the ISP it may also serve Web pages or Telnet sessions for testing purposes.
Remote direct dial-in modem applications are also supported by the MUCM. Niobrara engineers can provide sample programs to allow the MUCM to be a YMODEM server to allow the transfer of logged data files back to a central location.
ASCII Serial Device Networking
Data from ANY device using ASCII protocol can be acquired and manipulated by an MUCM before passing the pertinent data to a Momentum processor or to a communications adapter via data registers. Once the data is passed to the communication adapter, it is available to every other device on the network including PLCs, HMIs, or SCADA systems.
The MRPC application has been refined by NR&D engineers to be fast and reliable. The MRPC application comes preloaded on the standard MUCM and is provided on CD-ROM with purchase of MUCM. Any updates to the application are posted for download at
The MUCM can perform auto-scan and auto-transfer between the ports, permitting use as a data concentrator, SCADA interface, or allowing data to be shared between slave devices. Auto-scan can also collect and distribute data for or from an attached processor or communications adapter.