Connect the DB9 to RJ49 adapter cable first, and connect it in the order below. DB9 is the 9-pin serial communication interface RS232. DB9 to RJ45 cable connection diagram. 3, identify the COM port: five pins on the top, four pins on the bottom, the top leftmost is 1, the bottom rightmost is 9.
Usually the RS-232 interface has 9 pins (DB-9) or 25 pins (DB-9).32 to rs422 circuit schematic diagram '>rs232 to rs422 circuit schematic diagram
As shown in the figure, this is the connection diagram of RS232 to RS422, Mitsubishi FX series PLC download port. Hope to adopt...
RS232 TO RS485 connection circuit diagram description: The fifth and sixth pins of the 15-pin male connector are, I/O E, I/O F; The 12th and 13th feet are 5V Out and Ground.
RS-23RS-422 and RS-485 standards onlyUSB, just connect to the computer.
The nine-pin interface can be connected to the COM port, the nine-pin serial port is the RS-232 interface, the nine-pin interface is one of the communication interfaces on the personal computer, and the asynchronous transmission standard interface developed by the Electronic Industry Association.
geyes El-511 Connection RS232 generally can work only by connecting these three wires: receiving RXD, sending TXD, and grounding GND. However, due to the difference in the shape of the interface, the pin number and the signal line category are different, and the common 9 pins and 25 pins are two kinds.
Connects to the COM port. ninePin serial port is RS-232 interface, one of the communication interfaces on personal computers, by the Electronic Industries Association (EIA) developed asynchronous transmission standard interface.
Using a USB-to-RS232 adapter: Purchase a USB-to-RS232 adapter and connect it to the USB port on your computer host. The adapter converts the USB interface to an RS232 interface, allowing you to connect to RS232 devices.
The 232 level conversion circuit of this circuit is adoptedNIH232 or can also directly use MAX232 integrated circuit, 485 circuit adopts MAX485 integrated circuit. For ease of use, the power supply part is designed to be passive, and the power supply of the entire circuit is directly stolen from the DTR (4-pin) and RTS (7-pin) in the RS232 interface of the PC.
1, (51) MCU uses RXD and TXD pins to perform serial data input/output. 5 RS-2The RXD of 32 is connected to the single-chip TXD, and the TXD is connected to the single-chip RXD (the MAX232 chip is used in the middle to convert the level). Through the above steps, the computer can be connected and communicated with the single chip microcomputer (serial port) through the RS232 interface (without considering the software setting part).
2. Install a DB9 socket on the board. Similar to: desktop computer. That's a PC. In this case, you should choose the white graph (3 out and 2 in). If you want to make something really simple. No outlet. Instead: with a bundle of connecting wires. At the front of the wire, there is a DB9 plug.
3, MCU and computer connection generally have the following: RS232 serial port connection, which is the most common connection. RS232-usb, which is becoming more and more popular. JTAG--JLINK--USB (RS232), mainly used for simulation, JTAG connects to the MCU, and then connects to the computer through the simulator.
4, and PC connection: RS232/485 to CAN module has the characteristics of plug and play, so users can use PC RS232 connection directly with CANCOM module connection.
5, there are two methods: [1] Get a serial chip microcomputer, such as C8051F300, and a MAX232. One end is connected to a PC, one end is connected to a single chip computer. The GPIO of the microcontroller connects x1 and x2, such as P0 & P1, and sets them as interrupt pins.
6. After the TTL logic level of the MCU is converted to negative logic level by 232 chip, 232 GND- Computer GND (5), 232 TX- computer RX (2), 232 RX- computer TX (3).
The positive and negative differential voltages are used to represent 1 and 0. Therefore, data exchange between RS232 and RS485 communication standards requires level switching and control between full duplex and half duplex. U1 in the figure is a level switching integrated circuit; U2 is an integrated circuit that converts TTL levels to differential signals (MAX487, SN65HVD3082, etc.).
All three circuits are non-isolatedBlock diagram of power off. The first picture is a booster circuit, the second picture is a negative voltage circuit, and the third picture is a step-down circuit. In the figure above, U0 is higher than Ui, and the diode shuts off at static.
Start: press the start button SB2, the contact is closed, the contactor KM coil is charged, the main contact in the main loop (with arc extinguisher) is closed, and the motor stator winding is charged; At the same time, the KM auxiliary contact closes the self-locking start button, so that the KM coil is still charged after the button is disconnected.
Photoelectric switch, LR induction control KA1, KA2 relays work and stop. Door opening control, KA1,Any work of KA2 makes KM1 work and protect itself, making the drag motor drag the door open. The door opens to position SQ1 travel switch to stop the drive motor.
As shown below, this is the multimeter voltage and current test sampling circuit and conditioning circuit.
1, RS232 TO RS485 connection circuit diagram introduction: PIN 5, pin 6 of the 15-PIN male connector, I/O E, I/OF; The 12th and 13th feet are 5V Out and Ground.
2, RS232 and RS485 bus end is isolated, so the isolation design can effectively inhibit the interference on the RS485 bus to the 232 end. Three isolation design circuit powerbus widely uses RS-485 serial bus standard when the communication distance is tens of meters to thousands of meters.
3, Connect to the computer: RS232/485 to the can module has the characteristics of plug and play, users can use pcrs232 straightConnect to the cancom module.
4, RS232 serial cable direct connection method is a normal connection: 2,3, 3 (that is, RX at one end is connected to RX at the other end, TX is connected to TX at the other end); RS232 serial cable cross-connection method is cross-connection: 2 to 3 to 2 (that is, RX at one end is connected to TX at the other end, and TX is connected to RX at the other end).
5, the network structure is different RS232 is 1:1 communication, that is, one-to-one. RS485 is a 1: n communication mode, that is, one to many. The RS485 port is on the busIt is allowed to connect up to 128 transceivers, of which one serves as the host and the other serves as the slave, and multiple slaves are distinguished by the address code.