rs232 to rs485 converter circuit

{"title":"Industrial RS232 RS22 RS485 Fiber Media Converter Double Ring type","imgUrl":"https:\/\/img.chinax.com\/nimg\/33\/c8\/b976ea3d41692a7d398e2c2eeec0-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"E-link","Model Number":"LNK-GYS200","Minimum Order Quantity":"1 unit","Delivery Time":"5-10 working days","Certification":"ISO","Place of Origin":"China","Payment Terms":"T\/T, Western Union, MoneyGram,PayPal","Supply Ability":"10000pcs\/Month","Packaging Details":"Fiber Media Converter Standard Package","MTBF":"> 100,000 hours","Storage Temperature":"-40\u00b0C to +85\u00b0C","Working Humidity":"5%~95 % (no condensation)","Weight":"685g","Dimensions":"133mm\u00d740mm\u00d7120mm (H\u00d7W\u00d7D)","Operating temperature":"-40\u00b0C ~ 75\u00b0C"}}

{"title":"Anti Collision RS485 To RS232 Transverter 300BPS - 115.2KBPS For Electronic Lock","imgUrl":"https:\/\/img.chinax.com\/nimg\/6e\/6a\/df7bf0a903791d761b1545a23f2f-200x200-1.jpg","attrs":{"Price":"Negotiable","Model Number":"RS485-232","Minimum Order Quantity":"1 piece","Delivery Time":"5-15 days working time","Certification":"CE\/RoHS\/FCC","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"50000 piece\/month","Packaging Details":"The material of Package: K=K Reinforcement Carton;Carton:30 PCS\/CTN or customize according to customers' requirements","Appearance size":"64mmX33mmX17mm","Transmission distance":"less than 1200 meters (RS-485 end) within 5 meters (RS-232 end)","Working mode":"asynchronous full\/half duplex differential transmission","Transmission rate":"300BPS-115.2KBPS","Operating environment":"-20\u00b0C to 70\u00b0C, relative humidity is 5% to 95%","Protection level":"600W lightning surge protection for each line of RS-485 interface","Transmission medium":"twisted pair wire (wire diameter greater than or equal to 0.5MM) or shielded wire"}}

{"title":"1ch analog video+analog audio\/data fiber converter for CCTV system","imgUrl":"https:\/\/img.chinax.com\/nimg\/9f\/65\/6432a9c699a08824e8285e57c6bc-200x200-1.jpg","attrs":{"Price":"USD27~55USD\/pair","Brand Name":"JiaMinAVTech","Model Number":"JM-1V1Dd\/JM-1V1Aa","Minimum Order Quantity":"2pairs","Delivery Time":"3~5 working days","Certification":"CE,FCC,ROHS","Place of Origin":"shenzhen","Payment Terms":"T\/T","Supply Ability":"10000 pairs\/month","Packaging Details":"Standard package for 1pair analog video fiber converter: 1pcs analog fiber transmitter&receiver; 2pcs DC5V2A power adaptors; 1pcs user manual; all with pearl cotton protection","Function":"1ch analog video+1ch Bidi analog audio or 485\/232\/422 data","Dimension":"120mm\u00d7105mm\u00d728mm","Package size":"21.5\u00d716\u00d77cm","warranty":"1 year","Net weight":"0.32KG\/Pair","Fiber Interface":"FC\/SC\/ST","Material":"Iron","Distance":"0~120KM SM fiber(20KM default)","Working Temperature":"0~55\u00b0C","Color":"Black"}}