Chapter 6. Serial I/O, SNP & RTU Protocols212 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD6.2.6 Initialize Port Function (4300)This function causes a reset command to be sent to the specified port. It also cancels any COMMREQcurrently in progress and flushes the internal input buffer. RTS and DTR are set to inactive.Example Command Block for the Initialize Port FunctionValue(decimal)Value(hexadecimal)MeaningAddress 0001 0001 Data block lengthAddress +1 0000 0000 NOWAIT modeAddress +2 0008 0008 Status word memory type (%R)Address +3 0000 0000 Status word address minus 1 (%R0001)Address +4 0000 0000 Not usedAddress +5 0000 0000 Not usedAddress +6 4300 10CC Initialize port commandOperating NotesRemote COMMREQs that are cancelled due to this command executing will return a COMMREQ statusword indicating request cancellation (minor code 12H).CautionIf this COMMREQ is sent when a Write Bytes (4401) COMMREQis transmitting a string from a serial port, transmission is halted.The position within the string where the transmission is haltedis indeterminate. In addition, the final character received by thedevice to which the CPU is sending is also indeterminate.
