Ten Secret Belongings you Didn't Know about Rs485 Cable > 자유게시판

The InitSPI() function provides a convenient way to initialize the SPI as the master at a 2MHz baud rate. 1 running at the prior established baud rate (typically 19200 baud). Moreover, if Serial2 is running full duplex at 4800 baud, any other interrupt service routine that takes longer than 100 µs is likely to cause a problem. 1 running at the prior established baud rate (typically 115200 baud). If it doesn’t, confirm that the terminal’s baud rate is correct by selecting the Comm item in the Settings menu of the Mosaic Terminal program, and click on 115200 baud. If your computer does not have an RS-232 serial port, low cost USB-to-RS-232 serial cables are available; contact Mosaic Industries for details. These detailed signal descriptions and cable diagrams are presented to provide complete information for those who have special communications requirements and for those who wish to make their own application-specific communications cables.

So, for eight data bits with a parity bit, M would be set (equal to one) in order to add an extra bit to each byte transmitted, and PE would be set in order to make that extra bit be used as a parity bit. Data translation between different machines can be performed with ease, and applications that communicate via the one serial port can be debugged using the other serial channel. If you are using the QScreen as a slave device and require the /SS signal for your external SPI hardware, configure one of the Port A pins on the Field Header as an input pin. The byte-sized messages are transmitted and received via the MOSI (master out/slave in) and MISO (master in/slave out) pins. It receives bytes sent by a slave device via the "master in/slave out" pin, MISO. The only difference between the master and slave devices is that the master initiates the transmission. Bias termination - Using resistive termination decreases noise immunity, particularly if the cable is loaded with many devices. In fact, the program works the same as it did before, but now it is using the secondary serial port instead of the primary port - and you didn’t even have to recompile the code!

We’ll use code from the GETSTART.c program which was introduced in the chapter titled Your First Program. Because all of the serial I/O routines on the PDQ Board are revectorable, it is very easy to change the serial port in use without modifying any high level code. C program’s source code file. If your application requires RS485, you can use the secondary serial port (serial2) to program and debug your application code using the RS232 protocol, and use the primary serial port (Serial1) for RS485 communications. A jumper labeled "1 485En" (J4) enables RS485 operation on the Serial1 port if the jumper cap is installed, and configures Serial1 for RS232 operation if the jumper cap is not installed. A jumper labeled "2 485En" (J7) enables RS485 operation on the Serial2 port if the jumper cap is installed, and configures Serial2 for RS232 operation if the jumper cap is not installed. The primary and secondary serial communications ports are accessible through the QScreen's 10 pin, dual row Serial Header (H5) which is typically not installed, the 24 pin, dual row Field Header (H3), and through the individual DB-9 Serial 1 and Serial 2 connectors.

The PDQ Board's two serial ports support limited use of generating a parity bit. It provides a convenient means of connecting the QScreen Controller to a variety of peripheral devices, including analog to digital and digital to analog converters, real time clocks, and other computers which use high speed communication. They should generally not be needed, except if you use long cables, multiple RS485 devices, and resistive termination. Most computers conform to IBM PC AT-compatible RS232 interfaces which use 9-pin D-Type connectors, consequently the PDQ Board brings out its serial ports to two female 9-pin D-Type connectors on the Docking Panel. TER ports of the TSX Series PLC have a DPT signal pin, which is used to determine the work methods of the terminal TER. Since the AUX port of the PLC have no power output pins, TSX08PRGCAB can not use this port. The power of the cable is from the TER port of the PLC. Using the primary Serial1 port is easy. The advantage of using Serial1 for RS485 is that the Serial1 RS485 signals are also available on the Docking Panel, while the Serial2 RS485 signals are available only on the PDQ Board’s Serial Communications Header.

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