On Teensy 3.2, 3.5, 3.6, Serial1 and Serial2 have 8 byte transmit and receive FIFOs, which allow for higher speed baud rates, even when other libraries create interrupt latency. All serial ports on Teensy 4.0 and 4.1 have 4 byte transmit and receive FIFOs. Download openblas-serial-0.3.3-2.el6.x8664.rpm for CentOS 6 from EPEL repository. I 2 C uses only two bidirectional open collector or open drain lines, Serial Data Line (SDA) and Serial Clock Line (SCL), pulled up with resistors. Typical voltages used are +5 V or +3.3 V, although systems with other voltages are permitted. The I 2 C reference design has a 7-bit address space, with a rarely used 10-bit extension. Common I 2 C bus speeds are the 100 kbit/s standard mode.
While its original purpose was to replace wired serial communication, the methods of transmission have evolved over each iteration of Bluetooth. This article will provide an overview on how Bluetooth has changed over the past 20 years. Version 1.0 – 3.0: Bluetooth Classic.
Most USB users have some knowledge about USB 2.0 and USB 3.0, and that's mostly their differences in transfer rate. The question is the ‘how' and the ‘why', and simply knowing how the two cables work will surely provide an answer to that question.
- 1 Definitions
Definitions
USB 2.0 Cable
USB 2 being released in early 2000, it was meant to add a higher transfer rate than the USB 1.x, and indeed it runs at 480 MB/S. Although USB 1.x does have a disadvantage with its performance, the cables however appear the same with four pins on a standard pinout and five on a mini or micro pinout.
- USB 1.x/2.0 standard pinout
| Pin # | Pin name | Wire color | Description |
| 1 | V-BUS | Red or Orange | Power of +5 volts |
| 2 | D- | White or Gold | Data – |
| 3 | D+ | Green | Data + |
| 4 | Ground | Black or Blue | Common return path for electric current |
- USB 1.x/2.0 mini/micro pinout
| Pin # | Pin Name | Wire Color | Description |
| 1 | V-BUS | Red | Power of +5 volts |
| 2 | D- | White | Data – |
| 3 | D+ | Green | Data + |
| 4 | ID | N/A | Distinguishing cable ends (A plug (host):B plug (device) |
| 5 | Ground | Black | Common return path for electrical current |
Cables will also have different combinations of plugs on each end, whether it may be an A-type or B-type plug. You can refer to this table matrix for different plug combinations.
Aside from different plug type combinations, you should also know that having this certain kind of cables can only do so much with their length and that's why a USB 2.0 cable has a preferred maximum cable length at 5 meters or 16.4 feet.
You can grab a USB 2.0 cable with A-Male and B-Male plugs at 4.8 meters or 16 feet for around $4.80.
USB 3.0 Cable
The 3rd version of the USB (Universal Serial Bus), it provides more enhancements like your superfast transfer rate of up to 5 GB/s. The newer version however, the USB 3.1. can go for up to 10 GB/s transfer rate. Take note, these enhancements will not take effect unless the cables are USB 3.0 capable, that's because the new cable contains not only 4 or 5 pinouts but 9.
- USB 3.0 standard pinout
| Pin # | Pin Name | Wire Color | Description |
| 1 | V-BUS | Red | + 5 volts power |
| 2 | USB 2.0 Data- | White | USB 2.0 Data – |
| 3 | USB 2.0 Data+ | Green | USB 2.0 Data+ |
| 4 | Ground | Black | Common return path for electrical current |
| 5 | USB 3.0 Transmit- | Purple | Super speed transmitter – |
| 6 | USB 3.0 Transmit+ | Orange | Super speed transmitter + |
| 7 | Ground Drain | N/A | Ground for signal return |
| 8 | USB 3.0 Receive- | Blue | Super speed receiver – |
| 9 | USB 3.0 Receive+ | Yellow | Super speed receiver + |
You can distinguish a USB 3.0 cable by simply identifying its blue color. The number of pins on each end can also be an identifier, by having more pins than your standard 2.0 cables. The preferred maximum length of a USB 3.0 cable is at 3 meters or 9.8 feet. This is to avoid data transmitted to cause data loss and corruption.
You can grab a USB 3.0 cable with A-Male and B-Male plugs at 3 feet for around $9.00.
USB 2.0 Cable vs USB 3.0 Cable
What's the difference between a USB 2.0 cable and USB 3.0 cable? There are quite a few technical and physical differences that are notable, one being how fast the data is transmitted. USB 2.0 can handle a transfer rate of 480 MB/s but with USB 3.0, you can go as high as 5 GB/s or even 10 GB/s with USB 3.1. These differences however will only take effect as long as you use the required cables for your ports. A USB 3.0 port can only use USB 3.0 cables to be effective, but USB 2.0 ports can use both USB 2.0 and USB 3.0 cables. However, the performance will fall back to 2.0 rather than 3.0. The same is true for your USB 3.0 port using a USB 2.0 cable. It is possible but the performance will still fall back to 2.0.
One key difference between the two cables is their pinouts. A USB 2.0 can only have as many as 4 or 5, but a USB 3.0 has 9. This is one of the main reasons a USB 3.0 cable can offer much more transfer rate than your USB 2.0. The cables of a USB 3.0 will also tend to be slightly thicker because of having more wires inside it, and can only reach 3 meters to be effective. That being said, it will also cost more.
So to sum up, a USB 3.0 cable contains more wires, thus offering more transfer rate. With more wires in it, it will also need more pinouts than your USB 2.0. And finally, USB 3.0 cable is backwards compatible, but as long as a USB 2.0 port or cable is in use, even though your system can handle a USB 3.0, the performance will always be with your USB 2.0's performance.
Comparison Chart
| USB 2.0 Cable | USB 3.0 Cable |
| 4-5 pinouts | 9 pinouts |
| Less expensive | More expensive |
| Offers a maximum speed of 480 MB/s | Offers a maximum speed of 5 GB/s |
| Preferably 5 meters in length or less | Preferably 3 meters in length or less |
| Compatible with USB 3.0 port (As long as connector is compatible) | Compatible with USB 2.0 port (as long as connector is compatible and will have USB 2.0's performance) |
Description
Driver 3.2.0.0
Sets the data rate in bits per second (baud) for serial data transmission. For communicating with Serial Monitor, make sure to use one of the baud rates listed in the menu at the bottom right corner of its screen. You can, however, specify other rates - for example, to communicate over pins 0 and 1 with a component that requires a particular baud rate.
An optional second argument configures the data, parity, and stop bits. The default is 8 data bits, no parity, one stop bit.
Syntax
Parameters
Serial: serial port object. See the list of available serial ports for each board on the Serial main page.speed: in bits per second (baud). Allowed data types: long.config: sets data, parity, and stop bits. Valid values are:SERIAL_5N1SERIAL_6N1SERIAL_7N1SERIAL_8N1 (the default)SERIAL_5N2SERIAL_6N2SERIAL_7N2SERIAL_8N2SERIAL_5E1: even paritySERIAL_6E1SERIAL_7E1SERIAL_8E1SERIAL_5E2SERIAL_6E2SERIAL_7E2SERIAL_8E2SERIAL_5O1: odd paritySERIAL_6O1SERIAL_7O1SERIAL_8O1SERIAL_5O2SERIAL_6O2SERIAL_7O2SERIAL_8O2
Prolific 3.2.0.0 Driver File
Returns
