Whispered RS485 Standard Secrets > 자유게시판

Batteries not included (the battery versions work with AA 1.5V, alkaline or lithium batteries; for outdoor environments that go towards zero and below it is advisable to use lithium batteries). Works with 4 AA batteries (1.5V, alkaline or Lithium - for outdoor winter use you need to use AA lithium batteries because the alkaline ones suffer from the cold); on request it is also available for working with external 5V power supply. You will need to connect to a WiFi (home, work, laboratory, etc.) to connect to the Internet. In the WiFi settings (as in the figure above illustrating B), choose "WiFi MQTT". We repeat, all versions can be configured to transmit to a script on a Web server - it can be your "real" web server or a virtual web server of a home automation system (eg ControlHUB), automation home assistant; and they can use MQTT. You can enter the data relating to the MQTT Broker you want to use; the name of the Topic to be used to control it and to read the temperature is shown. After connecting as for point B, in the Settings it is possible to define a name for the device, and if the reading periodicity is less than 250 minutes, you can set an interval of hours in which the reading is not carried out/transmitted (for example you can deactivate it on the night, which is useful to save batteries for example when using a TXtemp paired with a SuperClock - while you sleep you don't need to measure the temperature and waste batteries).

I chose the BUK9Y40-55B, but there are lots of MOSFETs that'll work here - they need to be have more than 24 V of drain-source voltage (VDS), and more than 1 A of drain current (ID) with gate voltage (VGS) of 5 V. The BUK9Y40-55B has a VDS of 55 V and an ID of 26 A at 5 V VGS - more than enough! You can accomplish that current control scheme by driving a MOSFET using the PWM output of a microcontroller, but I wanted to try out the DRV120 - a single-channel relay, solenoid, and valve driver with current regulation. Can also control other loads subject to electrical suitability, e.g. small bulbs, DC fans (250Hz PWM frequency, others via custom firmware). In theatre and performance venues, RS-485 networks are used to control lighting and other systems using the DMX512 protocol. RS422 and RS485 operate in differential mode using balanced cables. In 1975 the EIA introduced two new specifications in order to upgrade system capabilities; these are the RS423 interface, which closely resembles RS232C, and the RS422 and RS485 interfaces, both of which allow higher transmission rates.

Buy by filling out the order form below. Exploit the fabulous launch prices, get it by filling out the order form below. The RP2040 is pretty flexible in terms of pin assignment for serial I/O, so most of the assignments here were made in order to make the layout easier. These motor controllers use a single-wire serial bus for communication and that resistor is required to tie the separate TX and RX lines together. RS232C interface A widely used standard interface that covers the electrical connection between data communication equipment, such as a modem, and data terminal equipment, such as a microcomputer or computer terminal. Prior to the domination now exhibited by USB, the RS232 standard was historically the most common serial interface. The EIA has officially disbanded and the standard is now maintained by the TIA as TIA-485, but engineers and applications guides continue to use the RS-485 designation. However, RS485 standard often a more attractive option is to use the new Super USIC. However, just because the 4-wire arrangement has the capacity for supporting simultaneous communication in both directions, it does not mean that the capability is always utilized, as is the situation with the C/MRI. It does not specify or recommend any communications protocol; Other standards define the protocols for communication over an RS-485 link.

The USB to RS485 Converter is a cost-effective module for transfer serial data over USB. Additionally, with separate send and receive wire pairs, it is easy to incorporate sending and receiving data LEDs as implemented on the JLC provided SMINI, SUSIC and RS485 cards. The fifth, or bottom pin in each RS485 header, is provided to maintain continuity for the shield normally used with RS485 cabling. Obviously it is not necessary to measure only the temperature, we have thought and are thinking about other things too; to date we have TXsoil for soil moisture (to be measured remotely e.g. for irrigation purposes), and for practically any type of measurement we have created TXdata RS485 ModBus - which can be connected to thousands of third party professional ModBus meters existing (and there is something for all needs: temperature and humidity meters, anemometers, voltage meters, energy, light meters, water meters, presence sensors, light sensors, soil moisture sensors, etc.; many meters professional work in standard ModBus; and not just meters; and it also supports RS232). In fact, other remote temperature measurement devices already exist, but they are usually expensive to maintain: we wanted something that was not only excellent and working with the most used standards, but even undemanding!