Tricks and tips for everyone


Can RS-232 provide power?

Can RS-232 provide power?

RS-232 is not providing any power. Something to power your “device” is needed.

Do laptops have RS-232 ports?

Many new laptop computers and some desktop models are now being shipped without RS232 serial ports and, instead, are equipped with USB ports.

How many wires are needed for RS-232?

The RS-232 Standard Although RS-232 does not specify connector configurations, two have become de facto standards: DB25 (a 25-pin connector, in which usually no more than 10 wires are used), and DB-9 (a 9-pin connector, in which usually all 9 wires are used).

What is the function of pin 3 in the 9 pin serial port?

An explanation of serial RS-232 mouse pinout

Pin Signal Description
3 TD Serial data from host to mouse (only for power)
2 RD Serial data from mouse to host
7 RTS(Request to Send) Positive voltage to mouse
8 CTS(Clear to Send)

What voltage is RS-232?

The standard specifies a maximum open-circuit voltage of 25 volts: signal levels of ±5 V, ±10 V, ±12 V, and ±15 V are all commonly seen depending on the voltages available to the line driver circuit. Some RS-232 driver chips have inbuilt circuitry to produce the required voltages from a 3 or 5 volt supply.

Why is RS-232 still used?

While USB has become the standard, RS232 is still widely used for older printers in the workplace. The RS232 protocol and cable allow the computer to give commands to the printer via a voltage signal. The printer then deciphers those commands and completes the print. There are a couple of disadvantages of RS232.

What is an RS232 cable used for?

While USB has become the standard, RS232 is still widely used for older printers in the workplace. The RS232 protocol and cable allow the computer to give commands to the printer via a voltage signal. The printer then deciphers those commands and completes the print.

How do I use a serial port on my laptop?

To use one, follow these steps:

  1. Locate a free expansion slot on your computer.
  2. Open up the slot.
  3. Insert the card making sure it is properly connected to the computer.
  4. Install the card’s driver if necessary.
  5. Plug your serial devices into your newly obtained COM ports.

What is RS-232 pinout?

RS232 connector is a port used for data exchange between equipments. It was designed for data exchange between DTE (Data Terminal Equipment) or PC and DCE (Data Communication Equipment) or MODEM. The need for RS232 came from limitations raised by parallel data exchange.

What is a RS-232 pinout?

What Is an RS232 9 Pin Pinout? RS232 monitoring hardware establishes a connection between data terminal equipment (DTE) and data communication equipment (DCE). In order to link these devices, an RS232 D9 pinout is essential, as this pinout will allow you to connect two devices successfully.

Why RS-232 is called so?

The term RS232 stands for “Recommended Standard 232” and it is a type of serial communication used for transmission of data normally in medium distances. It was introduced back in the 1960s and has found its way into many applications like computer printers, factory automation devices etc.

What is RS-232 voltage levels?

Voltage Levels The line voltages of RS232 range from -25V to +25V. They are categorized as signal voltage and control voltage. The signal voltage between +3V to +25V represents logic ‘1’ and the signal voltages between -3V to -25V represents logic ‘0’.

Is RS-232 obsolete?

Two of the oldest interfaces are RS-232 and RS-485. These legacy interfaces aren’t obsolete or discontinued, though. Both are still alive and well in many applications. The whole purpose of a serial interface is to provide a single path for data transmission wirelessly or over a cable.

Are there different types of RS-232 cables?

The RS-232 specification defines two types of serial devices, DTE and DCE. DTE normally refers to the serial port on a PC or terminal, while DCE refers to a modem or other type of communications device.

Is RS-232 a serial port?

A serial port complying with the RS-232 standard was once a standard feature of many types of computers. Personal computers used them for connections not only to modems, but also to printers, computer mice, data storage, uninterruptible power supplies, and other peripheral devices.

What COM port is RS-232?

serial port
RS-232 was commonly used in computers to connect devices like a printer or a telephone modem. In computer terminology the RS-232 connector is often referred to as the “serial port”. The RS-232 port is not much used anymore. Connection of devices is nowadays done through the use of USB.

Which are the timing pins of RS-232?

RS232 Pin Description It is a 25-pin connector, each pin has its function is as follows. PIN 1: (Protective Ground); It is a ground Pin. PIN 2: Transmit Data. PIN 3: Receive Data.

Is RS-232 a 9 pin?

An RS232 pinout 9 pin cable features nine pins: Data Carrier Detect – After a data terminal is detected, a signal is sent to the data set that is going to be transmitted to the terminal. 2.

What are RS-232 voltage levels?

Valid RS-232 signals are either in the range of +3 V to +15 V or the range −3 V to −15 V with respect to the common ground (Figure 1-1). To be more specific, the driver output is Logic 0 when the voltage is between +5 V and +15 V and is Logic 1 when the voltage is between -5 V to -15 V.

What are the pinouts of laptop/notebook batteries?

Pinouts of Laptop/Notebook Batteries: Type Remark Pin1 Pin2 Pin9 40001926 GND 755-4S4000-S1S1 14.8V 4Ah V+ V+ X BTP-34A1 14.8V 4Ah GND empty X BTP-S31 10.8V 5.4Ah, Note2b?, stops charging >13 GND ? X

What are the protection electronics inside a laptop battery pack used for?

Now it’s worth noting that, usually the protection electronics inside the laptop battery pack is used for preventing the battery cells being exposed to malpractices, and also to monitor battery capacity for the battery fuel-gauge.

How do laptop batteries work?

Moreover, a laptop battery packed with lithium-ion battery cells typically holds three different thermal safety mechanisms. The primary temperature monitor, working together with a smart chip, communicates to the charger circuitry over the system management bus (SMB).

What is a smart battery pack?

It is in fact a smart battery pack. This is the typical laptop battery system diagram. The smart controller electronics that reside inside the battery pack makes it smart, and it is the heart of the smart battery system.

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