New rs485 2 wire connection diagram - If your control gadget desires to receiving and sending records within the equal time you ought to use complete duplex transmission mode. It's far possible (and in actual international that is the most famous case) that manage system first sends request message and than waits for the reaction. For this form of structures 1/2 duplex verbal exchange is sufficient. This interface operates in half duplex mode at it handiest require 2 wires (complete duplex 4 wires) and is less difficult to construct. Connect your laptop computer with converter using rs232 cable. Run hyperterminal in windows or every other terminal application, set 9600bps, 8n1 and handshaking none. When you click on hook on and hook off icons you ought to be aware trade in green led .
Rs485 is an alternatve for rs232 for long distances. Most period of the cable for rs232 is only 15m. For rs485 it's far approximately 1200m. In addition you could connect many devices to rs485 bus (in contrast to rs232 — handiest 2). Ship/acquire mode is chosen by using rts signal. The converter become designed to be as easy as feasible, so it has no some functions that may be observed in industrial grade merchandise (e.G. Galvanic separation). Famous chip max232 is used to transform rs232 alerts from/to ttl level. Max485 converts ttl level signals to rs485 general. Rts line is used to change transmission mode of max485. Rts sign is first converted to ttl degree by using max232 then connected to de and re/ pins. 2 led s are used to signify present day nation of the interface.
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