GE PACSystems RX7i Reference Manual page 227
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- User manual (276 pages) ,
- Cpu programmer's reference manual (469 pages)
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Chapter 6. Serial I/O, SNP & RTU Protocols
Port Status Word Meanings
Bit
Name
Definition Status
Read In
15
RP
progress
Read
14
RS
Success
Read Time-
13
RT
out
Write In
12
WP
progress
Write
11
WS
Success
Write
10
WT
Time-out
Character
9
CA
Available
Overflow
8
OF
error
Framing
7
FE
Error
Parity
6
PE
Error
Clear to
5
CTS
Send
Data Set
4
DSR
Ready
Ring
3
RI
Indicator
Data
2
DCD
Carrier
Detect
1-0
n/a
Not used
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.
216
Meaning
Set
Read Bytes or Read String invoked
Cleared
Previous Read bytes or String has timed out, been canceled, or finished
Set
Read Bytes or Read String has successfully completed
Cleared
New Read Bytes or Read String invoked
Set
Receive timeout occurred during Read Bytes or Read String
Cleared
New Read Bytes or Read String invoked
Set
New Write Bytes invoked
Previously-invoked Write Bytes has timed out, been canceled, or
Cleared
finished
Set
Previously-invoked Write Bytes has successfully completed
Cleared
New Write Bytes invoked
Set
Transmit timeout occurred during Write Bytes
Cleared
New Write Bytes invoked
Set
Unread characters are in the buffer
Cleared
No unread characters in the buffer
Set
Overflow error occurred on the serial port or internal buffer
Cleared
Read Port Status invoked
Set
Framing error occurred on the serial port
Cleared
Read Port Status invoked
Set
Parity error occurred on the serial port
Cleared
Read Port Status invoked
Set
Clear to Send signal is active
Cleared
Clear to Send signal is not active
Set
Data Set Ready signal is active
Cleared
Data Set Ready signal is not active
Set
Ring Indicator signal is active
Cleared
Ring Indicator signal is not active
Set
Data Carrier Detect signal is active
Data Carrier Detect signal is not active
Cleared
These bits are always set to 0
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
GFK-2222AD
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