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The RS232 standard defines voltage levels for logical 1 and logical 0. Valid signals are in the range of +3V to +15V (logical zero) or −3V to −15V (logical one) as compared to the 0V ground (GND) pin. On most PCs, a signal level of ±13V is typical for RS232 and ±5V for RS485. Signals between -3V and +3V are invalid. Baud rate is the data transmission speed measured in bits per second. It defines the frequency of each bit period. For a baud rate of 2400 (2400 bps), the frequency is 2400Hz and the bit period is 1/2400. This is the information that a receiver uses to recover the bits from the data stream. RS-232 is a simple serial communication standard in which one bit of data is transmitted at a time over a serial cable at the relatively slow rate of up to 20K bits/second and distances up to 50-ft. By specifying the voltage, signaling, pin wiring and control data between a host device and a peripheral, the RS-232 standard ensured that devices from different manufacturers could communicate with each other.
If your Linux kernel is between v2.6.15 ~ v5.4 and your device has a new chipset version, please update the Linux driver Verify RS232 device is connected to COM PORT number between 1 to 4. This is a MUST, else it will not work. Data Carrier Detect (DCD): The Receiver (e.g. modem) tells the Sender (e.g. computer) it is connected to a working telephone line.Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 2012 R2, Windows 2016, Windows 2008 R2 Eaton's Keyspan RS232 to USB converter (Model Number USA-19HS) is widely recommended by serial device manufacturers for its compatibility and reliability. When you plug a USB to Serial Adapter like the USA-19HS into a Windows 10 machine, it should appear in the Device Manager under Ports (COM & LPT). If you do not see this heading, go to the View menu and make sure Show Hidden Devices is selected. If you still do not see your adapter, you will need to install the manufacturer's driver for your device. RS-232 (originally called Recommended Standard 232 but shortened to RS232) was developed by the Electronic Industry Association (EIA) in the 1960s for the exchange of data between DTE (Data Terminal Equipment) and DCE (Data Communication Equipment). It was later adopted by the personal computer industry so PCs could connect to modems, peripherals and data acquisition devices such as lab test equipment, GPS receivers and point of sale terminals.
RS232 cables can be simple parallel wires or twisted pair up to 15 m (50 ft.), and 1,200 m (4,000 ft.) for RS422 and RS485 applications.Proven performance in anti-electromagnetic interference (anti-EMI) capability for stable transmission performance Some devices will only connect to your computer using a port called "RS232 Serial Port". This port was used on old computers before 2003. Data rate depends on the length of the cable. Speeds shown are at maximum cable length. Longer distances can be achieved at lower speeds.
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