The use skill of 485A converter

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  • source:TRIANA CNC Machining
485A is home a kind of passive RS-232 of company of card of wave be an official goes to supplier of program of the famous communication that string together a mouth RS-485 converter. This product is not broken classical, the course is improved for years, had had more functions now. The article introduces 4 kinds to use skill basically. 1, additionally one kind offerring 485A1 of 5V power source external is 485A converter encloses a form, be type of an organic whole, make wiring terminal and converter made an organic whole. The wiring terminal of 485A1 takes 5V and GND, can provide faint electricity external, do not exceed 5V 20mA, can drive LED lamp, logistic circuit and small power comsumption are odd a machine.

485A also has this function, the 5 feet that are DB-9 needle end respectively (+ 5V) with 4 feet (GND) . The GND of the GND that notices this power source and RS-485 is same, interior weak point is received, the GND with RS-232 also is same. 2, the DB-9 Kong Tou that judges RS-232 to string together a mouth to whether have signal general 485A inserts standard RS-232 directly needle on, the LED light that sees wiring terminal go up is bright can judge RS-232 mouth to whether have signal. Because 485A steals report from the signal of RS-232 mouth, so RS-232 has lamp of signal criterion LED to shine. Also can judging 485A at the same time so basically is good, because at least the part of the circuit that steal report of 485A is the job is regular. 3, use terminal to converter of RS-485 of half duplex operation as RS-232 gules is to jump among terminal board line, because choose to whether receive resistor of 120 ohmic terminal, this resistor has soldered in wiring the opposite of terminal board. General not short receive jump line, need not add terminal resistance namely. Be in only the distance is further, rate compares Gao Shicai to need. 485A is the RS-232/RS-485 converter of a half duplex operation. 4, use as active RS-232/RS-485 converter general we know 485A is a kind of passive converter only, it is actually OK also active is used. Power source is received to 2 kinds receive a standard outside, be carried from RS-485 respectively namely and RS-232 termination power source. Power source is received outside be being carried from RS-485 simpler, introduce with the 2nd provide 5V power source external like receiving a standard. Nevertheless now is from exterior be added into 5V power source and not be output 5V power source, although 5V is mixed of GND terminal like bringing crural allocation. Power source is received to be bothered a bit outside be being carried from RS-232, must use DB-9/DB-9 to turn contact and solder power supply cord. Of special attention is, the 4 feet that power source is being received outside is DB-9 aperture are received, 5V (relative to 5 feet GND) , want to use segregation power source commonly so. Receive the anode that keeps apart 5V power source GND, negative pole accepts 4 bases, perhaps use 4 1.

5V batteries. CNC Milling