Move the serial cable from the "Serial Port 1" connector to the "Serial Port 2" connector on the QScreen. There are surface-mount resistor pads on the Docking Panel to bring out the RS485 signals to the DB9 Serial 1 Connector. 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. RS232 uses inverse logic; that is, a positive bit at the HCS12 UART is inverted by the onboard RS232 driver chip and appears as a negative signal on the serial cable. TER ports of the TSX Series PLC have a DPT signal pin, which is used to determine the work methods of the terminal TER. The primary and secondary serial communications ports are accessible through the PDQ Board's 10 pin, dual row Communications Header (H2) and through the Docking Panel's 10 pin, right-angle, dual row Communications Header (H1) and individual DB-9 Serial 1 and Serial 2 connectors. The mating 10-pin connectors that join the H6 header of the PDQ Board to the H4 header of the Docking Panel are typically not accessed directly, and are not discussed in detail here. The pinout of the PDQ Board’s Communications Header (H2), Docking Panel’s Communications Header (H1), and the Docking Panel’s Communications DB-9 Connectors are shown in the following tables.

The following table summarizes the available serial channels. In a finished instrument, either or both channels can be used to communicate with other serial devices, rs485 cable or with other computers and/or terminals using RS232 or RS485. After configuring the SPI system to communicate on a properly connected network of devices, sending and receiving data is as simple as writing and reading a register. Because a single pair of conductors is used for both transmission and reception, RS485 is useful for multi-drop applications in which a master communicates with multiple slave serial devices, or nodes. A single master can broadcast commands to all the slaves, and can direct commands to an individual slave using its unique address. After the slave transmission is complete, the slave puts itself back into receive mode so that the master can transmit additional commands. The master and slave could even exchange ascii QED-Forth commands. In this manner, data can be exchanged between the master and each slave on the bus. Two asynchronous communications ports named Serial1 and Serial2 can each be configured for RS232 or RS485 protocols. Owing to hardware constraints, if modem handshaking is needed on UART channel 1, then channel 1 must be configured for RS232, and channel 2 cannot be configured for RS232 communications.

By connecting pairs of these handshaking signals together, the terminal or PC can be made to think that the QScreen Controller is always ready to send and receive data. Once the project is open, click Build→ Build, and after the compilation is done, enter the Mosaic Terminal by clicking Tools→ Mosaic Terminal and use the Send File menu item to send GETSTART.DLF to the PDQ Board. Please contact Mosaic Industries if you need this custom configuration. TSX08PRG connect with computer and communicate with Schneider PLC need to install Uni-Telway or MODBUS driver to at first, for using the corresponding various PLC programming software, to realize the operations as upload, download, control and communications. The UART Wildcard implements these optional RS232 modem handshaking signals on channel 1. The handshaking signals can be disabled and/or ignored by applications that do not need them. This page describes the serial ports and how to use them for instrument control and automation applications. The RS232 driver and receiver use separate conductors on the serial cables, enabling full duplex communications. Although the RS232 protocol specifies functions for as many as 25 pins, each communications channel requires only three for simple serial interfaces: /TxD1 (transmit data), /RxD1 (receive data), and DGND (digital ground).

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. These protocols are summarized on this page, but for more information regarding their data formats and their use for simplex or multi-drop serial lines, consult Understanding Serial Communications (but keep in mind that that page is directed to the use of the UART Wildcard, so it uses different driver functions). The RS422 driver and receiver use separate differential conductor pairs on the serial cables, enabling full duplex communications. Note that the local and the remote must share a common ground, so a minimum of 3 wires are required for half duplex RS485 communications: a pair of transceive wires and a common ground. Note that the local and the remote must share a common ground, so a minimum of 3 wires are required for full duplex RS232 communications: a transmit wire, a receive wire, and a common ground. Each RS232 driver uses inverting logic and implements a single-ended bipolar output voltage (that is, one signal that swings above and below ground).