The Port Status Word can be:
Bit
Name
Definition
Meaning
15
RI
Read In progress
Set
Read Bytes or Read String invoked
Cleared
Previous Read bytes or String has
timed out, been canceled, or finished
14
RS
Read Success
Set
Read Bytes or Read String has
successfully completed
Cleared
New Read Bytes or Read String
invoked
13
RT
Read Time-out
Set
Receive timeout occurred during
Read Bytes or Read String
Cleared
New Read Bytes or Read String
invoked
12
WI
Write In progress
Set
New Write Bytes invoked
Cleared
Previously-invoked Write Bytes has
timed out, been canceled, or finished
11
WS
Write Success
Set
Previously-invoked Write Bytes has
successfully completed
Cleared
New Write Bytes invoked
10
WT
Write Time-out
Set
Transmit timeout occurred during
Write Bytes
Cleared
New Write Bytes invoked
9
CA
Character
Available
Set
Unread characters are in the buffer
Cleared
No unread characters in the buffer
8
OF
OverFlow error
Set
Overflow error occurred on the serial
port or internal buffer
Cleared
Read Port Status invoked
7
FE
Framing Error
Set
Framing error occurred on the serial
port
Cleared
Read Port Status invoked
6
PE
Parity Error
Set
Parity error occurred on the serial
port
Cleared
Read Port Status invoked
5
CT
CTS is active
Set
CTS line on the serial port is active
or the serial port does not have a
CTS line
Cleared
CTS line on the serial port is not
active
Apr-00
U
not used, should
be 0
Serial I/O / SNP / RTU Protocols
GFK-1503E User Manual 241
For public disclosure
Summary of Contents for VersaMax PLC
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