DNS/DHCP support IPv6 232/485 network TTL to TCP/IP serial server module. What is baud rate?
/TxD1, /RxD1, XCV1+, XCV1-
HCS12 Comm Header
Standard baud rates up to 115.2 Kbaud. Jumper selectable RS232 or RS485. Jumper selectable termination options. All signals are also available on the Docking Panel.
/TxD2, /RxD2, XCV2+, XCV2-
HCS12 Comm Header
Standard baud rates up to 115.2 Kbaud. Jumper selectable RS232 or RS485. Jumper selectable termination options. The RS485 signals are not available on the Docking Panel.
Analog Field Header
2-wire multi-drop bus, up to 100 Kbaud. Each device must have unique numeric address.
MOSI, MISO, SCK
Wildcard Bus Header
3-wire multi-drop bus, up to 10 MBaud if SPI bus master, up to 5 MBaud if SPI slave. Each device must have unique hardware chip select signal.
MOSI1, MISO1, SCK1, /SS1, MOSI2, MISO2, SCK1, /SS2
Used for inter-processor (IP) communications on multi-processor systems such as the PDQScreen. Can be used to communicate with other peripheral devices if multi-processing is not required.
RS232 and RS485 communications
The PDQ Single Board Computer (SBC) has two asynchronous serial communications ports named Serial1 and Serial2. Each serial port can be configured for the RS232 or RS485 protocol, and runs at standard baud rates up to 115,200 bits per second. The default baud rate after a factory cleanup is 115200 baud. The Serial ports are implemented by the dual on-chip hardware UARTs (Universal Asynchronous Receiver/Transmitters) on the Freescale 9S12(HCS12) microcontroller.
Each UART (sometimes referred to as a "USART") controls the serial-to-parallel and parallel-to-serial conversion and performs all of the timing functions necessary for one asynchronous serial communications link. They translate the bit-by-bit data on the serial cable into bytes of data that can be interpreted by the operating system or by your application program. The communications is asynchronous because no synchronizing clock signal is transmitted along with the data. Rather, the UART deduces the correct time to sample the incoming signal based on the start and stop bits in the signal itself.
The Serial1 and Serial2 ports have identical communications capabilities, although more of the Serial1 signals (both RS232 and RS485) are made available on the Docking Panels headers and connectors. After a factory cleanup, Serial1 is the default serial port for program development and downloading. In a finished instrument, either or both channels can be used to communicate with other serial devices, or with other computers and/or terminals using RS232 or RS485. Having a second serial port is also handy for system debugging. Since both channels can operate simultaneously and independently, serial debugging can be performed while the application program is
3 days ago