Emerson PNC001-A Series User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 6
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 149
6.2.9.2.1 Port Status Word Meanings
Bit
Name
Definition
Status
Meaning
15
RP
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
WP
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
CTS
Clear to
Send
Set
Clear to Send signal is active
Cleared
Clear to Send signal is not active
4
DSR
Data Set
Ready
Set
Data Set Ready signal is active
Cleared
Data Set Ready signal is not active
3
RI
Ring
Indicator
Set
Ring Indicator signal is active
Cleared
Ring Indicator signal is not active
2
DCD
Data
Carrier
Detect
Set
Data Carrier Detect signal is active
Cleared
Data Carrier Detect signal is not active
1-0
n/a
Not used
These bits are always set to 0

Emerson PNC001-A Series Specifications

General

Brand	Emerson
Model	PNC001-A Series
Category	Controller
Language	English