Initialize Port Function (4300) - GE PACSystems RX7i Reference Manual

Chapter 6. Serial I/O, SNP & RTU Protocols

6.2.6 Initialize Port Function (4300)

This function causes a reset command to be sent to the specified port. It also cancels any COMMREQ
currently in progress and flushes the internal input buffer. RTS and DTR are set to inactive.
Example Command Block for the Initialize Port Function
Value
(decimal)
Address 0001
Address +1 0000
Address +2 0008
Address +3 0000
Address +4 0000
Address +5 0000
Address +6 4300
Operating Notes
Remote COMMREQs that are cancelled due to this command executing will return a COMMREQ status
word indicating request cancellation (minor code 12H).
212
Value Meaning
(hexadecimal)
0001 Data block length
0000 NOWAIT mode
0008 Status word memory type (%R)
0000 Status word address minus 1 (%R0001)
0000 Not used
0000 Not used
10CC Initialize port command
If this COMMREQ is sent when a Write Bytes (4401) COMMREQ
is transmitting a string from a serial port, transmission is halted.
The position within the string where the transmission is halted
is indeterminate. In addition, the final character received by the
device to which the CPU is sending is also indeterminate.
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
Caution
GFK-2222AD