Software Serial Modbus Master over RS485 transceiver

Colin writes: We like cheap, well-made temperature controllers. Sure, we can make our own, but for a modest sum we can get a nice NEMA-rated package capable of reasonably complex logic with a communications interface. The Love 4C and 16C controllers can both be had for <$100 fit this description and make dependable control and higher-level […]

PIC Micro Modbus

Chas over at PNW/Electronics has been working on a PIC Micro MODbus project: MODbus is a older-than-dirt communications protocol for industrial process/power controls. It’s generally seen in the wild as MODbus/RTU which is a RS-485 protocol ran at 9600 or 19200 baud. Of course there are a ton of variations and it wouldn’t be a comm […]

App note: Modbus TCP for the Microchip TCP/IP Stack

Here’s another application note from Microchip – Modbus TCP for the Microchip TCP/IP Stack  (PDF!) Modbus® is an industrial Transmission Control Protocol (TCP) used for remote monitoring and control applications. This application note describes a basic Modbus TCP server implementation and how it can be extended in a Modbus application. The application software that accompanies this document […]