Rockwell-automation 2755-DM9, -DM9E High Speed Decoder Manual de usuario Pagina 127
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Chapter 8
Host Commands Using the RS-485 Interface
8–15
FUNCTION CODE (Byte 4)- The function code specifies the diagnostic
command:
00 = Diagnostic Loop
01 = Read Diagnostic Counters
03 = Read Diagnostic Status
07 = Reset Diagnostic Counters.
Diagnostic Link Reply Format
The decoder’s reply to a diagnostic command has the following structure:
LINK DIAGNOSTIC REPLY
STATUS
01000110
TRANSACTION WORD
HI Byte LOW Byte
DATA
The following are explanations of each byte in the reply message:
REPLY (Byte 0) - The reply byte has the following structure:
01000110
LSB
0110 = Link
Diagnostics
Command
Bit #6 Set
For Reply
Always Set to 0
MSB
STATUS (Byte 1) - Refer to Table 8.D for an explanation of the status codes.
TRANSACTION WORD (Bytes 2 &3) - The transaction word is returned
exactly as it was sent in the 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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