See our integration guide for how to set the baud rate on the IP2SL using its web interface. Having different baud rates set for controlling a device is the number one problem you will encounter with serial control and is easy to avoid by reading the equipment manuals, our integration guides, or configuring the devices.
Many devices with serial ports use a DB9 9-pin connector and often only use three pins: receive, transmit, and ground. Typical DB9 connectors with male left and female right on a straight-through serial cable. A male DB9 connector on equipment will typically transmit data on pin 3 and receive data on pin 2.
This device is commonly referred to as a DTE device. DTE stands for D ata T erminal E quipment and historically was a computer terminal that was sending information to a communications device, such as a modem.
A device with a female connector will typically transmit data on pin 2 and receive data on pin 3 and is often called a DCE device. If you are connecting devices that have different connector genders, then you typically will need a straight-through cable as shown in the following figure.
If you are connecting devices that have the same gender of DB9 connectors, such as connecting two DTE devices together, the cable will typically need to connect pin 3 on one end to pin 2 on the other end, and pin 2 on one end to pin 3 on the other end to ensure the transmitted data is received on the remote device and vice-versa. This is a cross-over cable as shown in the following figure. Having the wrong pin-out on the cable is the next most likely problem you will face with serial control.
Knowing the right pin-out requires reading the documentation of the product to be controlled or our integration guides. Basically, it allows for simple communication that enables you to control one device with another. You can use a hub to split the port and extend the length of the cable. It includes the protocols as well as the physical standards, and this communication is controlled by a device driver. It is a more complex form of communication than an RS connection. When you have an RS connection, such as between your laptop and your projector, the command is sent from the laptop, and the reaction happens in a very predictable timeframe.
With a USB connection, there might be more than one device sharing this connection. The protocol requirements are more complex, and you need to have the driver installed to ensure effective communication between the two devices. USB allows data to travel at a faster rate, which is why it is so common for more complicated communications.
It can work a lot faster than the older RS However, the RS is still used because it is simple and effective, and you only need to perform simple commands such as turning your projector on and adjusting some of the settings. Your computer will control the rest of the process. Although new technology often replaces older technology, some older technology works well, such as in this case. When you connect your projector to your home theater, you only need to be able to control it.
You are using it as a way to project content that is on your computer onto a large screen. 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. Note: The baud rate has to be same at both the transmitter side and receiver side.
DB9 connector has 9 pins and DB25 connector has 25 pins with each pin having its own function. Apart from the electrical characteristics, RS defined the functions of signals that are used in the serial interface. So how do you control an RS supported device? Want help with your next AV project? Featured Products. Site pages. Newsletter signup. First Name.
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