Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 122)

Chapter 8
Host Commands Using the RS-485 Interface
8–10
the decoder’s memory where the host can write data (addresses are provided
in hexadecimal):
1) Configuration Block- Address 400 to 5FF. Refer to Appendix D for
addresses of specific configuration data.
2) Command Area- 600 to 6FF. Writing to the command area will initiate a
command. Table 8.C lists the commands that can be initiated.
Address
(Hex)
Function
Address
(Hex)
Function
600 Clear Package Counter. 630 Clear All Match Counters.
604 Clear Output Counter 1. 631 Clear All Counters.
608 Clear Output Counter 2. 632 Save Configuration to EEPROM.
60C Clear Output Counter 3. 633 Set Configuration to Default Values.
610 Clear Output Counter 4. 634 Start Scan Trigger.
614 Clear Output Counter 5. 635 Stop Scan Trigger.
618 Clear Output Counter 6. 636 Flush Host Buffer.
61C Clear Output Counter 7. 637 Restart.
620 Clear Output Counter 8. 640 Repeat Read (See page 8-13).
624 Clear No-Read Counter . 641 Cancel Repeat Read (See page 8-13).
DATA (Bytes 6 through 127)- These bytes contain the data that is to be
written into memory (up to 122 bytes).
Unprotected Write Reply Format
The decoder’s reply to a write command has the following structure:
UNPROTECTED WRITE REPLY
STATUS 01001000
TRANSACTION WORD
HI Byte LOW Byte
The following are descriptions of each byte in the write reply message:
REPLY (Byte O)- The command reply byte has the following structure.