GE PACSystems RX7i Reference Manual

Chapter 6. Serial I/O, SNP & RTU Protocols
216 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD
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
Operating Notes
For reference, see the tables under Serial Port Pin Assignments in Chapter 5.
Support for the DSR status bit is provided for COM1 only, on all RX7i and RX3i models (except
CPE302/CPE305), in Rel. 7.16 and later releases.
Support for the RP and DCD status bits is provided only for COM1 on the CPE310, in Rel. 7.16 and later
releases.

GE PACSystems RX7i Specifications

General

Brand	GE
Model	PACSystems RX7i
Category	Controller
Language	English