Although many applications use RS-485 signal levels, the speed, format, and protocol of the data transmission are not specified by RS-485. Especially when the transmission is carried over a long wire outdoor, the wires is potential to carry the dangerous signal like lightning or other high voltage induction. After connecting as for point B, in the Settings it is possible to define a name for the device, and if the reading periodicity is less than 250 minutes, you can set an interval of hours in which the reading is not carried out / transmitted (for example you can disable the night). 2) right under WiFi settings, instead of WiFi TX to Hub / DisplayRX / RXeasy, choose the other settings and write your server / script URL. TXSoil can transmit the humidity to a Web server or to a VisualVision's display / concentrator such as DisplayRX or ControlHUB or RXTXeasy GSM - with adjustable interval, remaining for the rest of the time in standby with very low consumption. If there are several sensors near and/or other data to be transmitted via GSM, it is more convenient to use Standard / RF versions supported on a concentrator or controller such as RXTXeasy GSM so you will be able to use one single SIM.

It has a special capacitive sensor designed by us, efficient and of good precision, waterproof, resistant to oxidation and not subject to variations due to salinity and soil composition: better than this there are only the "extraction pressure" sensors (which we do not propose because they are not durable and also the sensor alone costs hundreds of euros). The probe is available with 0.8m or 3m cable; and possibly can be replaced by anyone with good dexterity. To get the solar PV power from the roof down to the basement shed, we purchased 20 meters of 6mm armoured cable; this was routed down the back of the house and into the shed through the stone wall. Works with 4 AA batteries (1.5V, alkaline or Lithium - for outdoor winter use you need to use AA lithium batteries because the alkaline ones suffer from the cold); on request it is also available for working with external 5V power supply. Bus Probes can be configured and tested using our web-based test app (you will need to connect the probes to your PC or Android smartphone via our Web485 board). 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.

According to the EIA there is a maximum of 32 Unit Loads on one cable segment. We found that there are 10K ohm resistors fitted on the A & B data lines with the A channel having a 10K pull-up resistor to 3.3 volts and the B channel having a 10K pull-down resistor to ground. How fast can I collect data via RS485? Pin 1 and 6 however are reassigned to the A and B lines when the port is used in RS485 mode. Normally pin 7 (RTS) and pin 4 (DTR) are used on the DB9 connector. The Jazz PLC series from Unitronics are not standard equipped with a RJ11 connector for serial communications. We installed a new Micro SD card with the latest Raspberry Pi OS, and after updating the software, the serial port and i2c bus were enabled. To set up communications for your meter or counter, see the Serial Communications section of its user manual. It has an EM112 Series Energy Meter fitted in the same box to monitor energy production and consumption of the inverter. The A signals of all devices should be connected with each other and the same goes for the B signals.

In order to avoid errors when many devices are connected, cables of the same colour should be used for all the connections to the terminals A and cables of the same colour should be used for all the connections to the terminals B of the various devices (e.g. white for A and blue for B). Interoperability of even similar devices from different manufacturers is not assured by compliance with the signal levels alone. Two wire telephone cables will not function because in that case the ground signal levels on both sides will be floating. Without termination resistors, signal reflections off the unterminated end of the cable can cause data corruption. For RS232 a crossover cable is used where pin 1 is connected with pin 6 at the other connector, pin 2 with pin 5, etc. This interconnects the transmit and receive signals of both PLCs, and also the handshaking signals DTR and DSR. Therefore the pin assignment is a little bit different from the default pin assignment on the RJ11 socket. The main difference is, that pin 1 and 6 on the RJ11 socket of the MJ20-PRG module are used as power supply. 00-3) or standard 12V power supplies. If A is negative with respect to B, the state is binary 1. The reversed polarity (A positive with respect to B) is binary 0. The standard does not assign any logic function to the two states.

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