Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 125)

Chapter 8
Host Commands Using the RS-485 Interface
8–13
description of the configuration parameters. For example to enable the large
buffer you would instruct the host to send:
UNPROTECTED WRITE
00001000
Write Command
HI Byte LOW Byte
10101010 10101010
Transaction Word
00000100 00011000
Buffer Address
00000000 00000001
Data- Value of 1
00000000
Status
UNPROTECTED WRITE REPLY
HI Byte LOW Byte
10101010 10101010
Transaction Word
01001000
Write Reply
00000000
Status- Successful
Note: In the example provided, the HI and LOW address (bytes 4 & 5) is for
the host buffer area of memory (418 hexadecimal). The data (byte 6) is to
enable the host buffer (1 = YES).