Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 129)

Message Packet Formats
Chapter 5
5-50
For example, if you wanted to set the processor to Run mode, your flag
byte would look like this:
Bit 76543210
00000010
Typed Read and Typed Write
Use these commands to:
read data from the processor starting at the PLC-5 system address plus
the packet offset or
write data to the processor starting at the PLC-5 system address plus the
packet offset.
The type of data sent with the Typed Write command must match the file
type being written. It is the responsibility of the host to do data type
conversions.
The format for the Typed Read message is as follows:
TNS STS CMD
0F
SRC DST FNC
68
PACKET
OFFSET
TOTAL
TRANS
SIZE PLC-5 SYSTEM
ADDRESS
Command Format:
TNS STS CMD
4F
SRC DST 1
1 Type/Data Parameter
Data Bytes — This can be up to 240 bytes long
(including the size of the PLC-5 system address).
2
2
Reply Format: