Rockwell-automation 2755-DM9, -DM9E High Speed Decoder Manual de usuario descargar pdf (Pagina 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.

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 166 167

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Rockwell-automation 2755-DM9, -DM9E High Speed Decoder Manual de usuario Pagina 122