GE VersaMax PLC

12.4.6.1 Example Command Block for the Flush Input Buffer
Function
VALUE
(decimal)
VALUE
(hexadeci-
mal)
MEANING
address 0001 0001
Data block length
address +1 0000 0000 NOWAIT mode
address +2 0008 0008
Status word memory type (%R)
address +3 0000 0000
Status word address minus 1 (%
R0001)
address +4 0000 0000 Not used
address +5 0000 0000 Not used
address +6 4302 10CE
Flush input buffer command
12.4.7 Read Port Status Function (4303)
This function returns the current status of the port. The following events can be detected:
• A read request was initiated previously and the required number of characters has
now been received or the specified time-out has elapsed.
• A write request was initiated previously and transmission of the specified number of
characters is complete or a time-out has elapsed.
The status returned by the function indicates the event or events that have completed.
More than one condition can occur simultaneously, if both a read and a write were
initiated previously.
12.4.7.1 Example Command Block for the Read Port Status
Function
VALUE
(decimal)
VALUE
(hexadecimal)
MEANING
address 0003 0003
Data block length
address +1 0000 0000 NOWAIT mode
address +2 0008 0008
Status word memory type (%R)
address +3 0000 0000
Status word address minus 1 (%
R0001)
address +4 0000 0000 Not used
address +5 0000 0000 Not used
address +6 4303 10CF
Read port status command
address +7 0076 004C
Port status memory type (%M)
address +8 0101 065
Port status memory offset (%M101)
Serial I/O / SNP / RTU Protocols GFK-1503E User Manual 239
For public disclosure