TXD: Send side, generally expressed as their own sender, normal communication must be connected to another device RXD.
RXD: the receiver, generally designated himself on the receiving end, normal communication TXD must be connected to another device.
When normal communication itself TXD RXD always connected device!
Since the resumption of spontaneous: RXD when normal communication TXD connected to other devices, so if you want to receive data sent by itself as the name suggests, is to receive the data they transmit their own, that is directly connected to its own TXD RXD, used and receive test itself It is normal, is the quickest and easiest way to test when there is a problem to do the first test to determine whether a product failure. Also known as the loopback test.
TTL level: usually binary data representation, provisions equivalent to + 5V logic 1,0V equivalent to a logic 0, called TTL signal system, is positive logic
RS232 level: the use of -12V to -3V, equivalent to a logic 0, + 3V to + 12V logic level equivalent to logic 1, negative logic
1, the main chip CP2102, generate a virtual serial port after installing the driver
2, USB to take power, leads to the interface includes 3.3V 40mA , 5V, GND, TX, RX, pin signal level is 3.3V, positive logic
3, on-board status indicators, the transceiver lights, right after installing the driver status indicator lit, send and receive indicator flashes when the communication baud rate, the higher the lower the brightness
4, support the baud rate between 300bps ~ 1Mbps
5, the communication format support: 1 5,6,7,8 data bits; 2 Support 1.5, 2 stop bits; 3 odd, even, mark, space, none parity
6, supported operating systems: windows vista / xp / server 2003/200, Mac OS-X / OS-9, Linux
7, USB head is male, can be connected directly to the computer USB port
8, SMD components for the SMT production process, and stability
9, does not have USB head volume: mm)
Buy this product includes the following accessories:
1, a welding test good module
NOTE: The USB to serial port can be used STC-ISPV3.94 above STC microcontroller download an older version that is STC89C (LE) and STC12C (LE) series The version of the chip may not be able to download, users will have the highest and lowest baud rate settings the same as when you can download the software, which we do not do that at your own discretion (STC-ISP Download copy into your browser address bar: ##2## face="??">After downloading unzip Please see, this is not the driver!
STC SCM download steps: TXD received MCU RXD, RXD connected microcontroller's TXD, GND connection GND, 5V connected to VCC, the software download point, then put the above said four feet into the microcontroller. Note: The microcontroller must have basic working conditions, including power, reset and clock! Meanwhile MCU TXD, RXD is not going to other peripheral devices, including the MAX232 do not take, otherwise it will cause the download failed! ! In the meantime, please do not disconnect the module from the computer!
note: The product just to make your computer more out of a serial port, GPS, satellite receiver, hard disk, Bluetooth module to communicate with a variety of serial devices such as. But the owner the ability and time is limited, it is impossible to know the use of each device, so Use a variety of devices The brush drive firmware, the receiver firmware upgrades and other value-added services This product does not belong to the scope of service, Please view the use of the product manual, and therefore do not accept the difference in assessment, please make another promising, thank you!
Module and Single please follow the following connections:
The following are the wrong connection methods:
Q: Why does not the PC USB to serial port using a DB9 as nest it?
A: PC serial port is DB9 head level 12V, and a negative logic, if you want to do a serial SCM MCU needs plus MAX232 serial converter circuit or the like to obtain a level compatible with the MCU signals. The USB to serial output is already 3.3V level signals can be directly connected to 5V or 3.3V microcontroller. When general communication only TXD, RXD, GND can. Therefore, USB to serial port can be connected directly to the serial port on the MCU without using MAX232 conversion circuit and the like, easier to use.
Q: Does this product need to install drivers?
A: need to drive, the description has been provided for each drive system, please download their own
Q: Did you provide a schematic or PCB diagram?
A: Sorry, but we do not provide schematics and PCB.
Q: You can brush the hard disk / satellite receiver do?
A: The product allows your computer to be more of a serial port, and is TTL level serial port, serial port as you do with this what purpose, as many serial devices, the restaurant can not provide the corresponding service, can not be for this purpose. The first thing to receive the product test the spontaneous self-closing, self-closing spontaneously by then the product can receive and send normally.
Q: How to connect microcontroller?
A: We have been given a picture connected to the microcontroller, please read them carefully.
Single-chip USB to UART Data Converters
- Integrated USB transceiver without external resistors
- Integrated clock without external oscillator
- Integrated 512 bytes of EEPROM for vendor code is the product code serial number plate power version number and product description and other data to provide storage space
- Power-on reset circuit - chip voltage regulator 3.3V output USB function controller
- Full compliance with USB Specification 2.0 (12 Mbps)
- Via SUSPEND pins and RI support USB suspend state
Asynchronous serial data bus (UART)
- All handshaking and modem interface signals
- Data formats supported:
8 data bits
Stop bits 1, 2
Parity: Odd parity, even parity, no parity
- Baud Rate 300bps to 921.6kbps
-512 Byte receive buffer 512 byte transmit buffer
- Support for hardware or X-On / X-Off handshaking
- Support for event status and conditions of the suspension line
Practical COM port device driver devices
- Existing COM ports can be used in conjunction with PC applications
- License issued of copyright
-Windows 98 / Me / 2000 / XP
-Linux 2.40 or later
RS-232 to USB upgrade traditional devices
- Mobile USB interface cable
-PDA USB interface cable
-USB To transfer the RS-232 serial adapter
- Self-powered: 3.0V to 3.6V
-USB Bus-powered: 4.0V to 5.25V
-28 Pin MLP (5mm * 5mm)
|Cash on Delivery||No|