Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual User Manual
Page 126
Message Packet Formats
Chapter 5
5-47
The link ID (presently not used, set it to zero) and the station address are
one byte while the file number is two bytes. The format for this message
is as follows:
Command Format:
Reply Format:
TNS
STS
CMD
0F
SRC
DST
TNS
STS
CMD
4F
SRC
DST
FNC
5E
EXT
STS
LINK
ID
STATION
ADDRESS
FILE
NUMBER
The STS and EXT STS bytes contain status and error code information.
For more information on these bytes, see the “Error Codes” section in this
document.
Read Bytes Physical
Use this command to perform an Upload Only after anUpload (or
Download) All Request has been successfully performed.
Command Format:
Reply Format:
TNS
STS
CMD
0F
SRC
DST
TNS
STS
CMD
4F
SRC
DST
FNC
17
DATA (Up to 240 Bytes)
SIZE
1
1
The Physical Address is a 4-byte field:
Byte
Physical Address Bit(s)
1
2
3
4
A00 - A07
A08 - A15
A16 - A23
A24 - A31
SIZE: The SIZE byte is a one-byte field that contains the number of bytes to read
up to 240 (must be an even number).
2
This byte will be the Extended Status byte if there is an error; otherwise it will be
data at Physical Address, first word, low byte.
2