DEFINE SERIAL COMMUNICATION PROTOCOL DRIVERS
DEFINE SERIAL COMMUNICATION PROTOCOL SOFTWARE

Protocol: which messages are exchanged under which circumstancesД«efore doing any kind of digital decode, we need to be able to tell the ones and zeros apart.

Framing: how bits are organized into groups and the role of each bit or group of bits.

Timing: how often bits are sent (bit time).

Levels: how voltages are used to represent zeros or ones.

In addition to the wire for the data bits, many protocols also add a clock signal, some type of control or addressing function for multiple nodes.ДЄlthough implementation details differ between protocols, all serial protocols have four basic characteristics, which are also important for the analysis and decode of serial data: While it is true that data bits are being sent over a single conductor or вЂњwire,вЂќ most serial protocols use multiple conductors. All of this comes at a cost, with serial transmission being more complex and harder to analyze. Serial transmission works well for longer-distance applications, applications needing higher throughput, and applications where there are multiple nodes. But as popular as parallel transmission once was, itвЂ™s now largely being replaced by serial transmission.ДЄs the name implies, serial transmission sends one bit at a time, with all the bits being sent over the same conductor. They have simple timing and are relatively easy to analyze. Parallel connections work well for short-distance and/or point-to-point connections. Parallel transmission moves multiple bits simultaneously between transmitter and receiver, usually with a separate conductor per bit.

There are many ways of moving bits, but the different methods of transferring bits can be separated into two main categories: parallel and serial transmission. serial transmissionДigital systems are based on the concept of bits, that need to be transferred between two components or devices. You can find ICs that support the RS485 protocol featuring converters to provide dual supply voltages.Transferring digital data: Parallel vs.

DEFINE SERIAL COMMUNICATION PROTOCOL DRIVERS

The receivers and drivers in circuits enable more than 32 drops with data rates that can be as high as 40 Mbits/s. As with the RS232 interfaces, components are readily available for designing the interface. RS485 is better suited for high speed and long-range communication where the capability to implement duplex networking is desired. Integrated circuits employing RS232 interfaces can make use of a single 3.3- or 5-V power supply with the inclusion of a charge pump and converter that supply positive and negative voltages. Data rates of 2 to 3 Mbits/s can be achieved for lines of limited length. It is simple and inexpensive to implement with readily available stock components such as UARTS, drivers, and connectors available for constructing the interface. ConclusionsД¬ommunication scenarios traveling over short distances that can tolerate low transmission speeds are best served by the RS232 protocol. If you work with serial devices and ports, you owe it to yourself to take a look at how you can benefit from these products.

DEFINE SERIAL COMMUNICATION PROTOCOL SOFTWARE

These converters usually work in both directions, allowing for both RS232 to RS485 and RS485 to RS232 connections.Д®lectronic Team has extensive experience in the field of serial communication and these are mature software applications. The existence of RS232 to RS485 converters allow the two protocols to be used together. The differences in these two protocols can make one solution more favorable than the other in certain applications. Cables for RS485 can extend up to 4,000 feet (1,200 m). RS232 cables are generally restricted to being 50 feet (15 m ) in length. Range - There are significant differences in the cable lengths that can be used with the RS232 and RS485 protocols. The recommended voltage for RS232 is +12V to -12V, and signals degraded to as low as 3V can still be understood. Voltage - RS485 uses voltages between +5V and -5V. Native RS485 is half-duplex, meaning it can only transmit in one direction at a time. To achieve duplex communication with RS485 you need another set of wires. Two-way transmission - RS232 is full-duplex, meaning that it can transmit data in both directions, both sending and receiving. RS485 cables only have three wires, 2 for data transmission and 1 for the ground. Each wire serves a distinct purpose in the data transmission. The number of wires - An RS232 cable is typically comprised of 9 different wires, though in some connectors, 25 wires are used.

So letвЂ™s take a look closer at these differences. The main difference between RS232 and RS485 serial ports are in:

Define serial communication protocol