Allen-Bradley 1779-KFMR User Manual page 157

Chapter 10
STS Code Description
(Hex)
00
C0
C1
C2
C3
C4
C5
C6
C7
C8
RC Control Header Fields
Figure 10.1 shows the format of the RC control message packet including
the RC header fields. The RC control header fields are those header fields
common to all RC control message set transmissions. Here we describe
these RC control header fields:
STS (RC Control Message Status) — In a command packet, this
one-byte field has a hexadecimal value of 00. In a reply packet, this
one-byte field indicates the status of RC control message transaction.
This status field does not indicate the status of the remote command
transaction initiated at the remote node. This field indicates either a
successful transaction completion or an error as follows:
STS Code
TNS (Transaction) — This two-byte field indicates which RC control
message transaction is taking place. A complete transaction consists of
the command packet and the corresponding reply packet. When the host
computer initiates a transaction, it must increment the TNS value to
distinguish the packets of the current transaction from the packets of the
previous transaction. When another station receives an RC control
command packet from your host computer, it must copy the TNS value
into the TNS field of the corresponding reply packet. This helps the
Description
(Hex)
C9
CA
CB
CC
CD
CE
CF
D0
D1
initiate