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The Acculevel transmitter with PE jacket is approved to NSF 61 and NSF 372 standards for water quality. The Keller Acculevel submersible level transmitter incorporates microprocessor-controlled signal conditioning to provide outstanding accuracy over temperature. You can change the set temperature and ventilation level without RS485 connection also. The RS485 connection allows users to retrieve both level and temperature data, interface with a PC, and rescale the analog output from 10% to 110% of the basic range (converter cable and Keller software required). Models equipped with 4-20mA or SDI-12 output include guaranteed lightning protection at no additional cost. The truth tables of most popular devices, starting with the SN75176, show the output signals inverted. The A signals of all devices should be connected with each other and the same goes for the B signals. The /SS (active-low slave select) is typically used to enable data transfers by slave devices when it is active low. I have to read datas from some devices connected through a RS485-USB serial communication cable. Serial1 port the default startup serial link.

The SPI can transfer data much more rapidly than an asynchronous serial link - its maximum rate is 2 Megabits/second. PCs are normally not equipped with an RJ11 socket for serial RS232 communications. 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. USB0 serial terminal to the rest of the system. The normal way to implement this is with a two wire system with differential signal levels. Two wire telephone cables will not function because in that case the ground signal levels on both sides will be floating. If your computer does not have an RS232 serial port, low cost USB-to-RS232 serial cables are available; contact Mosaic Industries for details. These cables evaluate and react to changes in automated environments much more quickly than standard cables, and are far more flexible for use in tight spaces and cable tracks. The existence of an RS485 port on the socket makes it even a little bit more difficult. Standard offerings include PROFIBUS, DeviceNet, AS-i Bus, RS485, RS422, FOUNDATION Fieldbus, INTERBUS and more.

Each of the two channels on the UART Wildcard can be configured for RS232, RS422, or RS485. It combines two industry standard digital communication protocols (SDI-12 & RS485) and is suited for environmental monitoring applications using existing SDI-12 monitoring equipment. The QScreen Controller combines an embedded computer based on the 68HC11 microcontroller with a touch panel and LCD (liquid crystal display) graphic user interface (GUI) that is ideal for instrument control and automation. The two lowest order bits in the SPCR control register, named SPR1 and SPR0, determine the data exchange frequency expressed in bits per second; this frequency is also known as the baud rate. 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.

If we want to connect a PC with an Unitronics PLC, for example for programming or debugging reasons, we need a connection cable which is on one side fitted with a female DB9 connector, and on the other side with an RJ11 jack. This MJ20-PRG module clicks in the PLC and provides one RJ11 socket for serial communications with a PC. The QScreen allows the details of the synchronous communications protocol to be customized for compatibility with a variety of peripherals. RS485 is another protocol supported by the primary serial port on the PDQ Board. When the keyword name is received by the Silence() routine running in the slave, the slave QScreen Controller executes RS485Transmit() to send an acknowledgment to the master (which should now be listening to the serial bus to accept the acknowledgment). We will use in this example the PC as MODBUS master. A 120-Ω resistor is included with the RS485 Pi which will need to be fitted if the board is connected to the end of the RS-485 bus. The ArduiTouch itself doesn't contain a RS485 interface.

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