Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 272)

16–7 PCCC Host Commands
Publication 2755-833
The following command reads the value of output counter 1:
7
5
1
3 2
4
6
0
0
2
4 5
1
3
STS= 00
TNS
High Byte Low Byte
LSB
Size = 4
Read Output Counter 1
00H
STS= 00H
TNS
High Byte Low Byte
MSB LSB
Read Reply
Counter Data
604H
7 6
CMD Reply = 41H
CMD= 01H
MSB
You can read more than one counter, however the read operation
must specify an address within the valid address range and start on
an address boundary. If you try to read outside a valid address range,
the reply returns with a status of 10H (invalid address).
Read Last Host Message
The last message sent to the host is stored at address 800H. The
command and reply format for reading the last host message is:
0
2
4
6
5
1
3
0
2
4
5
1
3
7
STS= 00H
Address = 800H
TNS
High Byte Low Byte
MSB LSB
CMD= 01H
Size (Unused)
Read Last Host Message
00H
STS= 00H
TNS
High Byte Low Byte
MSB LSB
Reply
Data from Last Host Message
CMD Reply = 41H