Cellular Extenders. Get information and tools to setup your new IX-series router. Add to compare. Digi WR44 R All-in-one cellular router with advanced routing and VPN features, designed specifically for use in rugged environments Rugged, enterprise-class cellular routers with advanced dynamic routing, security and firewall features Heavy-duty cast aluminum enclosure for reliable performance in rugged environments Integrated The RS protocol is a popular serial interface that is used to connect computers to peripheral devices such as modems.
We will take a look at the serial port pinouts used to implement RS as well as some additional reference information concerning the protocol. The RS protocol transmits data of wires employing signal levels that differ from the standard 5V in order to minimize signal interference. Distances of up to 20 meters are the limit for reliable data transfer using the RS interface.
The basic example of these two types of equipment defines a computer as a DTE device with a modem filling the role of DCE. The RS protocol specifies the operation mode, electrical standards, number of bits, and voltage levels to be used when transferring data between a DTE and DCE. Serial communication devices make use of 9 or 25 pin D-type connectors for their cabled connections. They are commonly designated as DB-9 or DB with the number used to differentiate between the pin counts.
The plugs contain sockets and pins, with each pin numbered and labeled. A serial pinout diagram is presented below. But still, RS has proven to be prominent. Moreover, it has better noise immunity. It is proven to be compatible across different manufacturers for interfacing computer and modems.
This standard is used for transmission of information exchange over the telephone lines. The electrical specifications for RS are updated in the year It specifies the electrical voltages, slew rate, line impedance, operation mode, and baud rate. They are categorized as signal voltage and control voltage.
Whereas the control voltage signals use negative logic, i. The change of input voltage determines the rate at which the RS driver responds. This is often termed as slew rate. The RS standard maintains a minimum slew rate with slow rise and fall time to reduce the cross-talk between neighbouring signals. The impedance bridging between RS driver and the receiver is defined to maximize the voltage transfer between the transmitter and receiver.
The RS devices work on single-ended signaling two wire. This means one wire transmits an altering voltage and another wire is connected to ground. Single-ended signals are affected by the noise induced by differences in ground voltages of the driver and receiver circuits.
The advantage of the single-ended technique is, it requires fewer wires to transmit information. It is the number of binary bits transferred per second. RS supports baud rates from to Commonly, the baud rate with , , , are used. It determines the speed at which data is to be sent from the transmitter to the receiver. In this type of cabling, one wire is grounded while the other is used to transmit a variable voltage.
They can be impacted by the noise produced from differences in ground voltage of the driver and receiver circuits. An advantage of the single-ended method is that fewer wires are needed to enable communication. The rate at which the RS driver responds is known as the slew rate. It is determined by the input voltage changes registered by the driver. The RS protocol defines a minimum slew rate with slow rise and fall times.
This is designed to minimize cross-talk between adjacent signals. Both types of D-sub connectors have male and female terminals. DB25 connectors employ 25 pins and DB9 uses 9 with each pin on an RS pinout having a specific function.
Diagrams of the DB9 pinout and the DB25 pinout can be seen below. It retains all of the features of the original standard but employs 25 pins. Of the 25 or 9 pins on a connector, only three are used to connect terminal devices. In addition to specifying the electrical characteristics, the RS protocol defines the functions of each signal used in the interface.
These include control and timing signals, common ground, and data signals. Here is a chart of the signals and functions that comprise the RS pinout. RS also provides secondary signals that complement the primary signals described above. The parity bits determine the validity of the message. Either one or two stop bits are usually sent.
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