@Tim_hms, I found this reply on another thread and want to be clear in my understanding of the half- vs. full-duplex requirement of the RS232 mode of the serial ports. We are connecting a serial port of the eWON extension card to a Modbus slave which does not specify whether the mode, half- or full-duplex, may be set. We are only reading values from the slave which, I believe, effectively forces a half duplex mode, correct?
Out of curiosity, on the setup of the MODBUS IOServer, Half Duplex is an option. Why is that provided as an option when the RS232 of the eWON requires that the connected device be full duplex?