GE VersaMax PLC User Manual

12.4.3 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.
NEW COMMREQ
Currently--
pending
COMMREQs
Autodial
(4400)
Write
bytes
(4401)
Initialize
Port
(4300)
Set Up
Input
Buffer
(4301)
Flush
Input
buffer
(4302)
Read
port
status
(4303)
Write
port
control
(4304
Read
bytes
(4402)
Read
String
(4403)
Cancel
Operation
(4399)
Serial
Port
Setup
(FFF0)
Write bytes
(4401)
No No Yes Yes Yes Yes Yes Yes Yes Yes No
Read bytes
(4402)
No Yes Yes No No Yes Yes No No Yes No
Read String
(4403)
No Yes Yes No No Yes Yes No No Yes No
12.4.4 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 is set to
inactive.
12.4.4.1 Example Command Block for the Initialize Port
Function
VALUE
(decimal)
VALUE
(hexadecimal)
MEANING
address 0001 0001
Data block length
address +1 0000 0000 NOWAIT mode
address +2 0008 0008
Status word memory type (%R)
address +3 0000 0000
Status word address minus 1
(%R0001)
address +4 0000 0000 Not used
address +5 0000 0000 Not used
address +6 4300 10CC
Initialize port command
12.4.4.2 Operating Notes
Note COMMREQs that are cancelled due to this command executing do not have their
respective COMMREQ status words updated.
Serial I/O / SNP / RTU Protocols GFK-1503E User Manual 237
For public disclosure

GE VersaMax PLC Specifications

General

Brand	GE
Model	VersaMax PLC
Category	Controller
Language	English