I am working on a panel pc(axiomtech panel 2003), it has one rs485 port, I want to know how can I communicate with it through windows? somthing like communication with rs232.
Hi,
If it is appearing as a COM port under Windows, you will be able to communicate through it as a COM port. But you will need a matching RS485 device connected to the port. Also RS485 ports come as 4-wire full duplex or two wire half duplex. What does the user manual of the system say about this port usage? Does it provide any application support for the port?
Do you mean that there is a convertor in mainboard that convert rs485 to rs232, and I can handle it as a serial(com) port using function like createfile and so on?
Hi,
RS485 is basically a single ended to differential line driver and is commonly used with RS232. So what I told is one of the possibilities. Strictly speaking I suppose any other serial protocol based hardware can also be terminated on 485 driver, so you need to check up with the user manual of the PC to confirm how it is used in this specific case.
Yes, and all the software that uses COM ports call API functions such as CreateFile, WriteFile etc. I have an unit to communicate with RS232 but it is written in Pascal for Delphi.