RS232 using EVKs

The Adesto Technology /Semitech SM240o is a multi-standard powerline communications modem that can be easily configured for industrial and metering applications.

RS-485 is a common protocol used in electricity meters and in industrial control and instrumentation applications.

The serial-to-PLC adapter is a simple way to extend/replace existing serial connections with  PLC without having to change any other software or hardware components. The adapter utilises passthrough firmware that conveys bytes from a serial port to PLC and vice versa.

RS232 using EVKs

There are two passthrough variants:

ASCII passthrough: copies all ASCII characters, which are received on the UART, verbatim to the PLC line, and conversely, forwards all ASCII characters received from the PLC line verbatim to the UART. The transmission to the power line in “ASCII passthrough” is triggered by reception of a special ASCII character, normally “End of Line” or “Carriage Return”, and can be changed on request. The configuration in “ASCII passthrough” can be changed using AT commands.

TP passthrough: is a variant of passthrough firmware, which forwards all bytes from the UART (not necessarily ASCII) to the PLC line, and, conversely, forwards all bytes received from the PLC line verbatim to the UART. The transmission to the power line in “TP passthrough” is triggered by timeout. Hence the name – Timeout-based Packetization. The acronym can also can be expanded as TransParent, as this variant requires practically no effort from the user. The limitation of this mode is that there is no way to change the configuration.

Note: The “ASCII passthrough” and the “TP passthrough” firmware does not support the protocol we use for our GUI which is   available on most other firmware packages. Consequently, cannot be used to communicate with the Serial-to-PLC Adapter. Use serial terminal applications instead.

The SM2400 PLC device with “ASCII passthrough” or “TP passthrough” is ideal for industrial control applications to replace or extend RS232 or RS485 connection without having to modify other parts of the systems or any of the software protocols.

1.           Features

  • Replacement of RS232 cable with DC or AC power line
  • Replacement of RS485 multidrop network with DC or AC power line
  • Using the powerline saves the cost of installing dedicated communications cables
  • Supports Modbus protocol
  • Operational band: FCC (Cenelec-B/C version available)
  • PLC PHY: OFDM (G3 FCC) or XXR (when additional robustness is required)
  • Effective PHY data rate up to 300 kbit/s (depending on band used)
  • Serial port interface speed: up to 625kbit/s
  • Packet size: up to 350 characters
  • Seamless PLC transmission with retries to improve robustness
  • Fully transparent mode (TP passthrough), plug and play coming out of the box without the need to do any programming.
  • Serial and PLC configuration parameters are accessible via AT commands (ASCII passthrough)
  • Please email us and we can provide more information

Theobroma  has developed a small form factor Powerline Communications packaged unit which is ready for immediate use.  It is ideal for industrial applications and can be packaged to suite the customer specific requirements. Powerline communications is a good robust solution for connecting sensors  securely using existing mains wiring which saves the major cost of the disruption and cost of installing […]

It all seems so easy to build a narrowband powerline communications networking system. It is just a matter f using one of the standards an it will all fall into place. Right? Wrong ! For smaller networks of up to 200 nodes a simple network needs address monitoring and applications to configure it. Semitech Semiconductor has written a simple application […]

This article gives an introduction to Solar Inverters and presents a neat way to make the solar micro-inverter a much ore cost effective solution. A brief overview of the technology and a comparison of single inverters, string inverters and micro-inverters is made You can download the article by clicking here : Introduction to Solar Inverters

Semitech Semiconductor has taken the next step in narrow-band communications and introduced the SM2480  power-line chip. You can check out the press release here It is much more than only a power-line chip, it is digital and analogue I/O  plus 4 high accuracy PWM outputs. There is more. On board the chip there  is a 90Mhz 32 bit micro-controller. The […]

The Really Smart Home Automation Solution If you are in the Smart Building Control / Home Automation / LED Lighting markets then  this article is for you. The Smart Home today needs to save energy more than ever. In Europe the price of electricity has sky rocketed over the last few years. Folks need to save their hard earned cash. […]

What payload can narrowband power-line communications carry ? is a question commonly asked. The confusion arises because almost every narrowband power-line communications manufacturer quotes the maximim line data rate. Numbers like 175kbps, 250kbps are quoted and this can lead to folks thinking that is is the payload that can be carried on the power-line. However in practice the real world […]

Communicating on USB , RS-232, RS-485 can be challenging in  industrial and building locations. Gridcomm manufacture a range of  power line modules. They enable users you to quickly install networking communications for USB, RS-232 and RS-485 in industrial and building environments . A key benefit of using narrowband power line  communications in industrial applications is that the 230 volts AC […]

I  work in the the industry with both Power line and Zigbee communications products. My hobby is also amateur ( ham ) radio and this got me thinking about Zigbee versus Power line and hackers.  Now this discussion is not super scientific and is my first thoughts on how hackers could attack either Zigbee or power line based systems Zigbee […]

The SM2400 is the first in a family of a new generation of Narrowband Power Line Communication (N-PLC) modem chips.  It combines cost effective design optimized for PLC applications, with a  high level of programmability to address a multitude of communications schemes and evolving standards. Extremely flexible, the SM2400 features a dual core architecture to guarantee superior communication performance while […]

We now are working with Adesto Technology