Rockwell-automation 2755-DM9, -DM9E High Speed Decoder Manual de usuario Pagina 117
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Chapter 8
Host Commands Using the RS-485 Interface
8–5
Use the unprotected read command to obtain data from the decoder’s
memory. Using this command you can “map” the memory of the decoder.
The read command is structured as follows:
00000000
00000001
TRANSACTION WORD
HI and LOW ADDRESS BYTES
SIZE OF DATA
MAXIMUM OF
124 BYTES
HI Byte LOW Byte
UNPROTECTED READ COMMAND
Unprotected Read Command Structure
COMMAND (Byte 0) - The command byte for the unprotected read
command has the following structure.
00000001
MSB LSB
0001 =
Unprotected
Read Command
Bit #6 Cleared
For Command
Always Set to 0
STATUS (Byte 1)- Status byte is cleared.
TRANSACTION WORD (Bytes 2 & 3)- As stated earlier, the transaction
word is provided by the host device and returned by the decoder (exactly as it
was sent) in the reply.
Unprotected Read Command
- Bulletin 2755 1
- High Speed Decoder 1
- • identify a hazard 2
- • avoid the hazard 2
- • recognize the consequences 2
- Using This Chapter 3
- Installing the Decoder 4
- Communicating With a Host 4
- Host Commands Using a 5
- RS-232 or RS-422 Interface 5
- Host Commands Using the 5
- RS-485 Interface 5
- Table of Contents 6
- Using This Manual 8
- Intended Audience 9
- Conventions Used 9
- Warnings And Cautions 10
- Nomenclature 10
- Related Publications 10
- Description of Hardware 11
- Laser Scan Heads 12
- Physical Description 12
- Indicators 13
- Chapter 2 14
- Description of Hardware 14
- Figure 2.2 14
- LED Indicators 14
- Communications Ports 15
- -- 120 VAC 240 VAC 17
- -- 200 V/ usec 200 V/ usec 17
- -- 4.0 A Peak 4.0 A Peak 17
- Power and Scan Head 18
- Connectors 18
- Accessories 19
- How the Decoder Operates 20
- DC Output Module Application 21
- Communications 22
- RAM and EEPROM Memory 25
- Operating Modes 26
- Trigger Ending Coditions 27
- Response Modes 27
- Configuring Your Decoder 28
- Programming Terminal Cable 29
- Menus and Setup Screens 29
- Start-up Procedure 29
- Chapter 4 30
- Select Operation Menu 31
- (Continued) 32
- Using and Editing the 36
- Configuration (Setup) Screens 36
- Command Bar 39
- Setup Screen #1 41
- Setup Screen #1 Fields 44
- Data Check Characters 46
- Host Communications 47
- Package Detect Input 50
- Setup Screen #2 51
- Setup Screen #2 Fields 53
- Code Lengths 54
- • No-read timer times out 55
- Match Code Table 61
- Programming Example 65
- Chapter 5 76
- Determining the Space 77
- Requirements 77
- Figure 5.3 78
- How to Connect Your Equipment 79
- Installing and Wiring Modules 80
- DC OUTPUT MODULES 81
- • RS-232: no flow control 85
- RS-422 Interface 86
- RS-485 + Transmit/Receive 88
- RS-485 - Transmit/Receive 88
- have the 88
- Message Format 89
- Example Data Messages 91
- Host Commands 92
- Two Character Commands 94
- C D H I M N O P R S 94
- Responses to Commands 95
- 1. Set Code 39, I 2 of 5 and 97
- Codabar Check Characters 97
- 2. Clear Output Counter 97
- 5. Set Host Communications 99
- 6. Write Header Message 100
- 7. Set Package Detect Input 101
- Filter and Sense 101
- 10. Set Message Format 102
- 9. Read Output Counter 102
- Interface 103
- Chapter 7 103
- 11. Read Match Code Table 104
- 12. Write Match Code Table 105
- 14 Write No-READ Message 106
- Read No-Read Count 107
- 16. Set Output Condition and 107
- Output Duration 107
- 17. Clear Package Count 108
- 18. Read Package Count 109
- 19. Reset Decoder 109
- Values, Save to EEPROM and 109
- 21. Save Configuration to 110
- EEPROM and Restart 110
- 22. Save Configuration to 110
- EEPROM (No Restart) 110
- 23. Set Scanner Control 111
- 24. Set Bar Code Specific 112
- Chapter Objectives 113
- RS-485 Command Protocols 113
- RS-485 ASII Command Protocol 113
- RS-485 PCCC Command 114
- Protocol 114
- 00001000 115
- PCCC Commands 116
- 00000001 117
- 01000001 119
- Unprotected Read Example 120
- HI Byte LOW Byte 120
- 01001000 123
- 00000110 126
- 01000110 127
- DIAGNOSTIC LOOP REPLY 130
- (SAME DATA AS COMMAND) 130
- RESET COUNTERS REPLY 130
- Power Input Fuse Replacement 132
- Module Fuse Replacement 133
- Troubleshooting 134
- Specifications 136
- Output Modules 137
- Input Modules 137
- Using a Lear Siegler ADM 3E 138
- Terminal for Programming 138
- Using a DEC-VT100 for 139
- Programming 139
- Using a Catalog Number 140
- 1784-T45 Terminal for 140
- Default Parameters of Decoder 143
- ASCII Conversion Table 145
- Configuration Areas of Memory 146
- Protocol Selection 153
- Transmission Check 154
- Glossary 156
- Cautions and warnings 160
- T45 terminal 165
- Warnings and cautions 166
- With major offices worldwide 167
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