GE VersaMax PLC User Manual page 241

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