Rs-485 pccc command protocol – Rockwell Automation 2755-DM9, -DM9E High Speed Decoder User Manual
Page 114

Chapter 8
Host Commands Using the RS-485 Interface
8–2
You can use RS-485 PCCC to communicate with a host programmable
controller using a PCCC format. The following diagram illustrates a PCCC
command.
00000010
01000001
DATA MAXIMUM OF 122 BYTES
HI Byte
LOW Byte
1
0
3
4
5
2
7
6
10010010
00110000
10001000
00000000
01110000
00000010
128
B
Y
T
E
S
M
A
X
The diagram illustrates both the high byte and low byte of each data word
(word = 2 bytes). Data is always transmitted with the low byte of each data
word first and then the high byte. The numbers on the diagram indicate the
order in which data bytes are transmitted.
PCCC Command Format
The Programmable Controller Communications Commands (PCCC) are sent
in packets of data having the following structure.
STATUS
COMMAND
TRANSACTION WORD
HI-ADDRESS
LOW-ADDRESS or
FUNCTION CODE
DATA
HI Byte
LOW Byte
128
B
Y
T
E
S
M
A
X
The LOW-byte is always sent out first and then the HI-byte. The following
are descriptions of each field of the command:
RS-485 PCCC Command
Protocol
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