A freelancer has to build a program based on PIC, that automatically manages the data flow direction of the RS-485 serial port from RS-232, taking into account the baud rate and the number of bits, without any special configuration or software command, i.e, totally transparent to the MCU.
It must be 100% compatible with Modbus!
Freelancer has to deliver:
Program in C/C++ before complilation (firmware).
Validation as Proof of Concept
I offer a pre-search that I did already and it also should work and it's exactly what I want:
You are invited to test it!
and another one:
You ONLY, through the PIC, have to control the Driver Enable, for example, of the MAX487, when the driver DE is active or deactivated in the line. Refer to the design!
Usually there are ways like 555 or a transistor, but I would like to implement with PIC.
3 freelancers estão ofertando em média $27 para esse trabalho
Hi , it looks like a simple task , you need to develop the same functionality module like on the market "rs232 - rs485 converter" . I can write firmware and test it in the Proteus software
Do you want to implement RS-485 over RS-232 ? Basically you want to implement RS485 direction control on RS-232 port using firmware control. This can be achieved. You have to explain me your requirements ?