Initialize Port Function (4300) - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
6.2.5.1 COMMREQS that Must Complete Execution
■
■
■
■
■
■
■
■
6.2.5.2 COMMREQs that can be Pending While Others Execute
The table below shows whether Write Bytes, Read Bytes and Read String COMMREQs can
be pending when other COMMREQs are executed.
Currently-Pending
COMMREQs
Write Bytes
No
(4401)
Read Bytes
No
(4402)
Read String
No
(4403)
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.
Serial I/O, SNP & RTU Protocols
Autodial (4400)
Initialize Port (4300)
Set Up Input Buffer (4301)
Flush Input buffer (4302)
Read port status (4303)
Write port control (4304)
Cancel Operation (4399)
Serial Port Setup (FFF0)
No Yes Yes
Yes Yes No
Yes Yes No
NEW COMMREQ
Yes Yes Yes Yes
No Yes Yes
No Yes Yes
October 2019
Yes Yes
No No Yes
No No Yes
Section 6
No
No
No
145