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I was wondering if someone could confirm if it is feasible to interface a GSM module for example SIM900, SIM900, Quectel's M95 or Neoway's N10 , maybe if we use the RS232 interface with HW the flow control pins RTS/DTR to the MAX485 or equivalent to talk to a master RS485 node ? or do i need to use a microcontroller to handle that job ?

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  • \$\begingroup\$ I can't be bothered to go search for the datasheets. If it has UART interface then yes you can use RS-485. If it actually has RS-232, the design is outdated and the product should be avoided. No MCU needed in either case, it's just hardware signal levels. \$\endgroup\$ – Lundin Feb 11 '20 at 7:15
  • \$\begingroup\$ What got me suspicious is i never saw an RS485 GSM modem without having its own microcontroller, that got me intrigued. \$\endgroup\$ – Sultanpepper Feb 11 '20 at 12:47
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Yes definitely. You do not need another micro controller for that. Any product with UART can be brought out on RS485, with a level converter like this:
enter image description here

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