The CB485 provides an RS-485 interface for microcontroller projects. A PCB soldermask helps prevent solder bridges on tracks and a silkscreen legend provides part locations. 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. Common standards: RS232 RS422 RS449 RS485 20 mA current loop Serial data transmission standards including RS232, RS422, RS423, and RS485 were widely used for many data links, proving effective connectivity for the day. The CB485 can be used with a wide number of RS-485 converter ICs using the common MAX483 and MAX485 half-duplex 8-pin DIP pinout. Serial data communications standards - RS-232, RS-422, & RS-485 were widely used for data transfer providing easy connectivity for the time and they can still be found today. Although not nearly as widely used today, they can still be found in some areas. The RS485 interface can use RJ45 jacks for CAT-5 cable or a terminal block. RS485 RS-485 is a standard that allows high speed data transmission along with multiple transmitters and receivers and this makes it able to be incorporated as a network solution.

Multiple receivers may be connected to such a network in a linear, multidrop bus. This allows RS-485 to implement linear bus topologies using only two wires. RS-485 is used as the physical layer underlying many standard and proprietary automation protocols used to implement industrial control systems, including the most common versions of Modbus and Profibus. In a computer system, SCSI-2 and SCSI-3 may use this specification to implement the physical layer for data transmission between a controller and a disk drive. RS-485 signals are used in a wide range of computer and automation systems. There are 6 uncommitted lines on the headers if you want to add additional signals to the ribbon cable. There are modules for RS323-DCE (DB9F), RS232-DTE (DB9M), and RS485 interfaces. 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). It seems if there is a lot of RFI in the installation, shielded twisted cable can be justified. A DIL16-to-DIP16 ribbon cable can be used to carry the signals, power, and ground to a breadboard. 5V power, ground, and the 8 port bits. It can be plugged into microcontroller dev boards with ComBoard serial port headers allow the serial port type to be easily changed.

All headers are on a 0.1" grid to allow accessory proto-boards to span multiple connectors if needed. The power input connector can be a coaxial barrel connector, a 2-pin terminal block, or a MTA-100 connector or 0.1" spacing header. With Modbus, BACnet and Profibus, A/B labeling refers A as the negative green wire and B as the positive red wire, in the definition of the D-sub connector and M12 circular connector, as can be seen in Profibus guides. The RS485 chip converts CMOS level transmit (Tx) and receive (Rx) lines to differential RS485 voltages than can be sent over long distances. Read more about RS485. However the other standards that have been introduced more recently provide higher levels of performance that are very useful in may applications. Also on this day in 1923, Charles Jenkins, an inventor from Dayton, Ohio, who invented a mechanical television system called radiovision and claimed to have transmitted the earliest moving silhouette images. The equipment located along a set of RS-485 wires are interchangeably called nodes, stations or devices. The AVR1284-3U board uses removable UART interfaces called ComBoards. All the interfaces are brought out to various connectors to easily hook up to accessory boards and peripheral ICs.

The 0.1" spacing of parts and mounting holes allow it to be soldered onto prototyping boards. This is an unpopulated board and no parts are included. A DIP IC socket can be used to allow easy IC replacement to use different speed/feature parts or to replace damaged parts. With the 1x10 male header option, the CB485 can be used with solderless breadboards. Build with 1x10 male header for use with solderless breadboards. Various build options are possible including 4-wire serial, 1x10-pin female ComBoard header, or a 2x5-pin shrouded header for use with ribbon cables. The PCB-CB485 is a bare PCB to build the CB485 logic-level to RS-485 adapter. Grounds between buildings may vary by a small voltage, but with very low impedance and hence the possibility of catastrophic currents - enough to melt signal cables, PCB traces, and transceiver devices. It may be used to control video surveillance systems or to interconnect security control panels and devices such as access control card readers. This would enable the same standards to be used worldwide and also give manufacturers access to a global market using just one product. RS-485 supports inexpensive local networks and multidrop communications links, using the same differential signaling over twisted pair as RS-422.

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