Rockwell Automation D17846.2.4 CONTROLNET KT EMULA - Manual (Page 25)

Publication 1784-6.2.4 - September 1997
How Your Driver Operates the KTCX Card 3-5
6. The KTCX card takes the packet and sets the Send Data Valid and
Send Access Request bytes to 01h.
7. The KTCX card transmits the packet.
8. The KTCX card receives the response packet.
9. The KTCX card checks the receive mailbox.
10. The KTCX card places the response into the receive mailbox and
then resets the Receive Access Request and Receive Data Valid
bytes to 01h. The host has access to the receive mailbox.
11. The host checks the Receive Access Request and Receive Data
Valid bytes. If both are 01h, then it copies the Diagnostic Status
Reply packet from the KTCX’s dual-port into its own buffer.
12. The host resets the Receive Data Valid and Receive Access
Request bytes to 00h to allow the KTCX to use the mailbox for
the next packet.
13. The host application acts upon the contents of the Diagnostic Sta-
tus Reply in the buffer as needed.
Send Packet Example #2: Memory Map of Diagnostic Status
Command.
Table 3.B shows what addresses 0082h through 047Fh would contain
during a typical on-link (local) Diagnostic Status Command. The
transaction number (TNS) to node 5 is 0605h, and the Diagnostic
Status command is 06, function 03.
Table 3.D Memory Map of a Diagnostic Command
Byte Description Contents = Meaning
:0082h Length N/A
:0083h Length N/A
:0084h Reserved N/A
:0085h Reserved N/A
:0086h Destination N/A
:0087h Control N/A
:0088h Packet Type N/A
:0089h Link Service
Access Point N/A
:008Ah CMD (PCCC) N/A
:008Bh Message Status N/A
:008Ch TNS (low byte) N/A
:008Dh TNS (high byte) N/A
:008Eh FUNCTION N/A
:008Fh
:047Fh DATA N/A