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We also highly recommend using paired twisted cable for connecting most converters. Some of these converters can convert from RS232 to both RS485 and RS422 however many standard models only has one of the protocols. Even RS485 is not commonly as popular as RS232 it is extremely useful for converters in industrial and commercial environments. The RS422 converter is used for data transmission, using balanced or differential signaling, it is mainly used in industrial and commercial environments since lots of process equipment and machinery have this protocol built-in. The reason is that the serial RS232 protocol is, even its old, a very reliable, stable and solid communication protocol, which can easily be implemented with existing industrial equipment. The RS232 - RS422 converter is also often used in older serial devices such as older PLC's and terminal equipment. If the serial port terminal device receives data but does not respond properly, monitor the data from the serial port device. RS485, also known as TIA/EIA-485 is a standard serial communications protocol defining the electrical characteristics of a serial converter, drivers and receivers for use in balanced RS485 digital multipoint systems. It may be used to control video surveillance systems or to interconnect security control panels and devices such as access control card readers.

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. Below you will see a cabling example for one master and two slaves in a full-duplex and a half-duplex situation. A RS485 bus consists of one master and multiple slaves. In contrast to EIA-485 (which is multi-point instead of multi-drop), EIA-422/V.11 does not allow multiple drivers but only multiple receivers. The advantage of the RS485 protocol is that this it can transfer data over longer distances, up to 4000 feet, and have up to 32 nodes per single network, and it can be used for multi-point networks where multiple serial devices are setup in a bus network. Usually a RS232 - RS485 converter is the preferred way to establish multi-point networks when working with RS232 devices. Now there was certain instances I used STP wire for rs485 because I had a lot of devices connected in a long run chain (DMX512 lighting fixtures). 3106A is what I typically use to wire balanced audio. Wire up the RS485 stacks and set the termination switch on the first and last RS485 Extension in the bus to "on", as shown below.

You should see the Master Brick view with the identified RS485 Extension (see images below). RS485 master is the Master Brick which has a USB, Ethernet or WIFI connection to the PC running brickd. In the case where a TCP connection is established but no data is received, following the assessment in 1), if the TCP channel is established but no data is received, further investigation is necessary. All the other Master Bricks with RS485 Extension must not have a USB, Ethernet or WIFI connection (they can use a USB Power Supply). The RS485 Extension can be positioned in the stack as you wish. The Master Brick of each stack has to be the lowermost Brick (except if you are using a Power Supply). To create a RS485 bus, stack the RS485 Extension on top of a Master Brick. Configure the extension as slave or master (as described here). Each RS485 slave is identified with its own ID. The RS485 data transmission standard requires that each network node be linked via a single transmission line terminated at each end in its characteristic impedance. Board lengthened at the power connector end for additional screw down holes.

Extending a RS232 line is done by converting the RS232 signal into RS422 and then back to RS232 at the remote end. It is interesting to measure the humidity of the ground, but we have also thought about other things; and then we have TXtemp to measure the temperature (one of the uses of TXtemp is in association with SuperClock), and for practically any type of measurement we have TXdata (RS232, RS485 ModBus) - which can be connected to thousands of existing third-party professional RS232 or ModBus meters (and there is something for all needs: temperature and humidity meters, anemometers, voltage meters, energy, light meters, water meters, presence sensors, brightness sensors, soil humidity sensors, etc. ; practically all professional meters are available in ModBus or RS232 standard; and not just meters). If there is a lot of environmental electrical noise then an optical isolated converter is preferred. Termination resistors also reduce electrical noise sensitivity due to the lower impedance.

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