Rockwell Automation D17846.2.4 CONTROLNET KT EMULA - Manual (Page 26)

Publication 1784-6.2.4 - September 1997
3-6 How Your Driver Operates the KTCX Card
Send Data Memory Map
Refer to Table 3.C to determine the use of each dual-port address as
you send packets.
Table 3.E Send Data Memory Map
Byte Description Function
1 Contents = Meaning
Typical Access
2
KTCX . . . . . Host
Comments
:0080h Send Access
Request STAT 00h = KTCX control
01h = host control R/W . . . .R/W This is one of the send mailbox control bytes. The proper
order for setting them is 0081h (Send Data Valid) first, then
0080h.
:0081h Send Data Valid STAT 00h = KTCX control
01h = host control R/W . . . R/W This is one of the send mailbox control bytes. The proper
order for setting them is 0081h first, then 0080h (Send
Access Request).
:0082h Length (lo byte) PKTCX --- R . . . . . . . .W Indicates length of the mailbox data in two bytes.
:0083h Length (hi byte) PKTCX --- R . . . . . . . W
:0084h Reserved --- --- --- All reserved bytes must be set to 00h.
:0085h Reserved --- --- ---
:0086h Destination PKTCX --- R . . . . . .. . W Destination address of packet.
:0087h Control PKTCX 05h R . . . . . . . W Always 05h.
:0088h Packet Type PKTCX 00h R . . . . . . . W Packet type is always 00h.
:0089h Link Service
Access Point PKTCX 00h = on-link packet R . . . . . . . W Off-link packets need 11 extra bytes which we insert starting
at byte 008Ah. The remaining bytes (008Ah-047Fh) are
shifted 11 places higher. Link Service Access Point (LSAP)
specifies the type of packet and offset.
:008Ah CMD (PCCC) PKTCX --- R . . . . . . . .W Sent to the destination to effect a command or command
sequence. Used in combination with :008Eh. Refer to
DF1
Protocol and Command Set (Pub. 1770-6.5.16) .
:008Bh Message Status PKTCX --- R . . . . . . . .W Indicates status of message transmission. Command and
reply messages may contain one of the status codes listed in
the
DF1 Protocol and Command Set (Pub. 1770-6.5.16) .
:008Ch TNS (low byte) PKTCX --- R . . . . . . . .W The transaction numbers are a 16-bit, 2-byte sequential
tracking numbers. They make sure that commands and their
replies remain associated. If the host issues a command,
then it must generate and track the TNS. Otherwise, the
issuing PLC or another KTCX card generates the TNS.
:008Dh TNS (high byte) PKTCX --- R . . . . . . .. W
:008Fh
:047Fh DATA PKTCX --- R . . . . . . . .W Bytes 008Fh-047Fh contain the data to be transmitted (and
the response packet, if any).
1
CMD = Command From Host to KTCX; DIAG = Diagnostic Counter; STAT=Status; INI = Initialization; N/A = Not Applicable
2
R = Read; W = Write