UART TRANSMIT SECTION

The UART transmitters are programmed for the appropriate baud, number of data bits, and whether or not parity is to be enabled for the output data to be transmitted. This circuit reacts to a “Data Ready” flag, and latches the data into its 16-byte FIFO. The data is then loaded into the transmitter shift register, and is then shifted out. The parity is transmitted as received from the T1 receiver, and is not checked or regenerated. The end equipment is responsible for parity checking.

The NCM module utilizes two additional transmitter circuits that interface with the Common Module exclusively in NMS mode of operation. These circuits include “Address Passing” and “Character Pacing”. Typically, the NCM will allow messages meant for the particular node in which it is physically installed, to pass, and block all others. However, the NCM can be configured to pass “any address”, or a wide-range of addresses greater than or less than a specified address.

The Common Module is also given permission to talk to the bus in response to a message qualified as an address match. All other Common Modules in the network will be forced off the bus as a result of any valid address header but no address match. The most recent addressed Common Module will have control of the bus until any other Common Module is addressed.

“Character Pacing” is required so that the NCM does not saturate the Common Module port with a continuous data stream of characters following an address match. This prevents the Common Module processor from “missing” characters if they are received without idle time between consecutive characters.

5. T1 TRANSMIT MODULE

The T1 transmit module acknowledges the “Data Ready” flag set by either local UART receivers, and latches the (character) data. The data is then transmitted in consecutive T1 frames at the proper time slot on the positive edge of the T1 clock. Indication of T1 transmit can be observed at the TXA and/or TXB LEDs, and via the NMS software.

If the NCM has both busses enabled, the data received from a T1 bus is re-transmitted back onto the same bus on the next frame. This pass-thru data has higher priority over the data from the local UART receivers.

The NCM, for all modes except NMS mode, transmits an idle pattern when data is not active at either UART receiver, or the T1 bus (if applicable). The idle pattern may be interrupted at any time when data is ready to be transmitted.

In NMS mode only, the NCM transmits an address pattern when data is not active at either UART receiver, or the T1 bus (if applicable). The address pattern may be interrupted at any time when data is ready to be transmitted. The address frames are received and terminated at the adjacent NCM in the network.

RFL NCM

 

RFL Electronics Inc.

November 6, 2007

25

(973) 334-3100

Page 24 Page 26
Page 25
Image 25
RF-Link Technology Network Communications Module, RFL NCM manual Uart Transmit Section, T1 Transmit Module
Page 24 Page 26

Network Communications Module, RFL NCM specifications

RF-Link Technology has emerged as a significant player in the realm of wireless communication, and one of its standout offerings is the RFL NCM (Network Communications Module). This module is designed to facilitate efficient and reliable data transmission in a variety of applications, making it a versatile solution for both industrial and commercial needs.

The RFL NCM is built on advanced RF technologies that support multiple communication protocols, ensuring compatibility with different systems and devices. One of its main features is its exceptional range. The module is capable of transmitting data over long distances, making it ideal for applications where devices are spread out. This long-range capability is essential for remote monitoring and control tasks, such as in smart agriculture, environmental monitoring, and industrial automation.

Another defining characteristic of the RFL NCM is its low power consumption. The module employs energy-efficient communication methods, enabling devices to operate for extended periods without frequent battery replacements. This makes it particularly useful in applications where power availability is limited or where continuous operation is required without maintenance interruptions.

The RFL NCM supports a variety of communication protocols, including LoRa, Zigbee, and MQTT, providing flexibility for developers and integrators to choose the most suitable technology for their specific applications. Its robust design ensures resilience in various operating conditions, including extreme temperatures and potential environmental hazards like moisture and dust.

Ease of integration is another strong point of the RFL NCM. With extensive documentation and support, developers can quickly incorporate the module into their existing systems. It also features built-in security protocols to safeguard data during transmission, which is particularly important in today’s increasingly connected world where data breaches are a growing concern.

The RFL NCM is not just about performance; it inherently supports scalability, allowing users to expand their network as their needs grow, whether that's adding more sensors to a monitoring system or integrating additional devices in a smart home. This commitment to both performance and adaptability makes the RFL NCM an attractive option for developers looking to harness the power of RF communications.

In summary, the RF-Link Technology RFL NCM stands out due to its long-range capabilities, low power consumption, support for multiple communication protocols, and robust integration features. With applications across various sectors, including industrial, commercial, and residential, this module promises to enhance connectivity and streamline operations in an increasingly wireless world.
Top Page Image Contents