Below circuit ( recommended by an expert from TI, link: ADS1115: Voltage Divider for differential voltage - Data converters forum - Data converters - TI E2E support forums ) worked very well with ADS1115 + Arduino for bi-directional voltage measurement !! (Vcc can be 3 to 5V) It is successfully measuring as low as +/- 2V range voltages (with the same 1:200 voltage divider) with ads.setGain(GAIN_SIXTEEN) and also I able to measure higher voltages above +/- 500 V by keeping the programmable gain of ADS1115 at ads.setGain(GAIN_TWOTHIRDS)) or ads.setGain(GAIN_ONE))
Hi, @venkat_yalamati
Welcome to the forum.
To help use this forum.
https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum
Please post your schematic in a post as some forum members are using different platforms that have problems with uploading from external sources.
Thanks.. Tom.. 
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Hi @TomGeorge ... sorry for using link for image... now i removed the link & uploaded image
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