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RS485 drivers : Up to 1200 m using 26AWG twisted pair wire at 115.2 k Baud into 120 Ohm loads. If you would rather skip the detail, please do not hesitate to jump ahead to the section, BAUD RATE SETTINGS. 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). You can find out more about the differences between RS485 and RS232 here. There are different serial communication standards such as RS232, RS422 and RS485. Whereas RS232 can support communication between only two devices, an RS422 port can be connected with up to 16 devices, or nodes. Additionally, data can be transmitted at up to 10MBit/s which is faster than most standards. In computer systems, RS485 is used for data transmission between the controller and a disk drive.

Most Modbus implementations use RS485 due to the allowance of longer distances, higher speeds and multiple devices on a single network. Due to this and it being able to transmit data over long distances, the RS485 is used commonly as a protocol for POS, industrial and telecom. This is due to the minimal wiring required due to the wiring configuration requirements of RS485. With RS485 on the contrary there is no such thing as a common zero as a signal reference. RS485 is however most popularly used in programmable logic controllers and factory floors where there are lots of electrical noise. As mentioned, an example of serial communication is RS485. Manufacturing facilities use serial communication to link their devices together. Serial communication also has a deterministic behaviour to avoid collisions of data packets, making it more reliable for a linkage system with many devices. However, in a full-duplex setup, they are limited to a master and slave communication where slaves cannot communicate with each other. Here are the detailed specifications of RS485. RS485 at its core with 2 wires allows half-duplex data transmission. By adding another 2 wires, making it a 4 wires system, it allows data transmission in both directions to and fro devices at the same time, also known as full-duplex.

In this setup both the TX and RX share a single pair of wires, therefore it is limited to half-duplex data transmission as the data cannot be transmitted simultaneously to and fro each device. In RS485 standard, data is transmitted via two wires twisted together also referred to as "Twisted Pair Cable". RS485 is used more industrially where many devices need to be interconnected together for a system. This leads to a circuit that is more defensive that you might usually see. Ultimately, it can be thought of in a way that serial communication is more made for this usage as compared to the common USB and ethernet. It is like the Universal Serial Bus (USB) or ethernet that we can find in many of our modern computers. You can view the hardware design files for Starfish on GitHub if you'd like to take a closer look at anything. This means that data can be simultaneously transmitted and received between devices. This means data can be transmitted in both directions to and fro devices one direction at a time. With Modbus, BACnet and Profibus, A/B labeling refers A as the negative green wire and B as the positive red wire, in the definition of the D-sub connector and M12 circular connector, as can be seen in Profibus guides.

A (green, negative) is higher than B (red, positive). This is necessary because simply attenuating a negative signal will not bring the voltage between the local ground of the receiver and VCC. Devices will be linked together via a bus configuration as shown in the picture above. RS485 is also used in performance venues to control lights and systems such as the one shown below. RS485 is used as the physical layer for many standards and proprietary automation protocols to implement control systems, most commonly Modbus. All about RS485 - How RS485 Works and How to Implement RS485 into Industrial Control Systems? The RS485 is also common in computers, PLCs, microcontrollers and intelligent sensors in scientific and technical applications. To address this indeterminate state, two common methods are employed. The RO, RE, DE, and DI signals are controlled by the RP2040, with RO and DI connected to the UART's RX and TX. The truth tables of most popular devices, starting with the SN75176, show the output signals inverted. 5Vdc. Each SMINI output port is separately configurable by selecting the appropriate output transistor and installing the appropriate jumper. At this point, let’s just focus in on the SMINI.