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Two-wire RS485 is half duplex and requires a means for switching between a receive or transmit state. The F485 converter uses the incoming data to control the direction and therefore requires no control signals from the master device (RS232 or fiber) to switch from transmit to receive mode after the last character has been transmitted.
DCE should be selected. Another application which requires DCE is when two F485 converters are connected back-to-back i.e. converting RS232 to RS485 or fiber and then converting the RS485 or fiber back to RS232. In this case, the second F485 must be set to DCE control.
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