SPIDER Automation™ 【USB to RS232 Converter】 High-Speed Serial DB9 male Cable 1-port Adapter, CE FCC RoHS Certified, Based on (industrial FTDI Chipset), 1 meter cable length | by SPIDER Automation : Amazon.in:
Comparison of RS-232 and RS-485 - plc247.com
The RS232 Standard
RS-232 Bus Description and EIA232 Pinout
RS-232 Bus Description and EIA232 Pinout
RS232 Tutorial on Data Interface and cables
Do you Know the Difference Between RS-232, RS-485 and RS-422?