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Rs485 is low impedance balanced , so twisting the pair helps with noise immunity as well as reducing the attenuation effect of higher baud rates due to the parallel capacitance of the wires in the cable jacket over the long lengths. This function properly configures the directions of the SPI I/O pins, and configures the data transfer such that data is valid on the falling trailing edge of the clock, with the clock idling in the low state. 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). This works well and prevents the existence of ground loops, a common source of communication problems. Its simplest implementation requires only three wires: one to transmit serial data, a second to receive serial data, and a third to provide a common ground reference. Chassis and signal grounds are connected together to the digital ground (GND) signal.

The SCK pin’s synchronous clock signal has configurable phase, polarity and baud rate so that it can interface to a variety of synchronous serial devices. This person has proved that it can be done (see link). The master can instruct a single slave to go into transmit mode, and then the master can put itself into receive mode, thereby allowing the master to retrieve data from the slave. A Modbus RS485 connects a Master device to one or more Slave devices. One was mostly blue with a white stripe and the other was white with a blue stripe. The master is in charge of designating which receiver is on at any one time. At any given time, only the master and a single "active" slave communicate. Henceforth, we shall consider Slave devices to be measuring instruments with serial communication, even if the cabling is similar for all Modbus devices. This makes it easier to identify cabling errors. The cabling of the industrial communication systems (Modbus RS485) is different in some ways from the cabling used for power cabling and the electrician may experience some difficulties if he is not an expert in Modbus communication networks. The flexibility and power of the 68HC11’s serial peripheral interface supports high speed communication between the 68HC11 and other synchronous serial devices.

After looking at all your links, I do not believe there is an actual Ethernet interface at all. I'm mostly used to ethernet with a pair consisting of completely solid and white with a stripe. The cable to be used is a shielded twisted pair (telephone type). Is it necessary to do the ethernet cable splicing as indicated in the above link, or should I simply be able to use the provided USB cable? But I notice that he describes using a (different) RS-485 to USB converter and splicing from the Ethernet cable to the converter, rather than using the converter cable that ships with the charge controller. Note that this Hackster project does something similar with splicing an ethernet cable to a UART breakout module. Each of the two channels on the UART Wildcard can be configured for RS232, RS422, or RS485. Using a repeater, the main cable is divided into different segments, each of which can be up to 700 m in length and connect 32 devices (this number includes the repeaters). No I have not been able to test this using the Windows software. 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.

The RS485 protocol uses differential data signals for improved noise immunity; thus RS485 can communicate over greater distances than RS232. It can only transmit/receive data serially, so it first converts the parallel data into serial data and then transmits the data. Each device has a communication port with two terminals, which are indicated for the sake of convenience as A and B. In these two terminals the communication cable is connected so that all the devices that take part in the communication are connected in parallel. Unlike what happens in many energy distribution systems, the manner in which the devices are connected in parallel is important. The RS485 system used for Modbus communication provides a main cable (Bus or backbone), to which all the devices have to be connected with branches (also known as stubs) that are as short as possible. Large phone cables have solid with white stripes, and solid.

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