RS serial adapter cable for speedy communication and data transfer; 9-pin DB-9 male RS serial on one end and 4-pin Type A male USB RS Tutorial on Data Interface and cables selection. The types of driver ICs used in serial ports can be divided into three general categories: Drivers which. How to get RS communications working between your computer and measuring device: RS pin connections, testing, serial port notes.


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The resulting common problems were non-standard pin assignment of circuits on connectors, and incorrect or missing control signals.

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The lack of adherence to the standards produced a thriving industry of breakout boxespatch boxes, test equipment, books, and other aids for the connection of disparate equipment.

A common deviation from the standard was to drive the signals at a reduced voltage. For many years, an RScompatible port was a standard feature for rs 232 serial cable communicationssuch as modem connections, on many computers with the computer acting as the DTE. It remained in widespread use into the late s.

In personal computer peripherals, it has largely been supplanted by other interface rs 232 serial cable, such as USB.


RS is still used to connect older designs of peripherals, industrial equipment such as PLCsconsole ports, and special purpose equipment. Revision D was issued in Rs 232 serial cable with the RS standard include: Rather than having the standard pin connector, this computer and many new expansion boards for pc's feature a 9-pin serial rs 232 serial cable.

To connect this port to a standard pin port, a 9- to pin adaptor cable may be utilized, or the user may create his own cable specifically for that purpose.

RS Tutorial on Data Interface and cables

Selecting a Rs Cable The major considerations in choosing an RS cable are based upon the devices to be connected. It can be used to query the modem status while the modem is on-line and busy communicating. On personal computers, the smaller DB9 version is more commonly used today.

The diagrams show the signals common to both connector types in black. Obtain all the information rs 232 serial cable about your instrument or device. You will rs 232 serial cable to know the number of the com port into which you have plugged your device, the device baud rate, number of bits in the data byte and parity.

Enter this information in ComDebug. If you have information about the Stop Bits then use it, otherwise set them to 2. This will at worse slow the message down slightly.

RS Serial Port Communications: Connecting Instruments - Windmill Software

Rs 232 serial cable you are using a virtual com port, for example with a USB-RS adaptor, open the Device Manager from Windows Control Panel to find the number of the com port that Windows has assigned to your device. Send a message If you rs 232 serial cable persuade your device to send a message, perhaps a power on message or a message that can be initiated by a button press, then do so.

This will verify your signal connections. At this stage you should select the no handshake option when setting up the COM Port.


If you still can't receive any data, you rs 232 serial cable have a wiring error. Use the ComDebug program's COM Port Status window to check the state of the lines to and from the computer, and see points 3, 4 and 5 below. This loopback test works if your instrument is a DTE computer type with a 9-pin connector.

See above for more on DTE type instruments.

The RS-232 protocol

Disconnect the RS cable from your instrument and check it has a socket on the free end. One of the stickiest areas of confusion in datacom is rs 232 serial cable the terms "transmit" and "receive" as they pertain to Rs 232 serial cable data terminal equipment and DCE data communication equipment.

In synchronous communication, this confusion is particularly acute, because more signals are involved. So why is it that you sometimes send data on TD, and other times you send data on RD?

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