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Appendix
C
C1
General Asynchronous Link Error Codes
(STS, EXT STS)
Asynchronous link (RS-232-C) error codes are passed in the link message
packets. You can find these codes in the:
Status (STS) Byte of the Message Packet
Extended Status (EXT STS) Byte of the Packet (for Some Commands)
The STS is divided into two nibbles (4 bits):
The Local Error Nibble
The Remote Error Nibble
36547210
Remote Error Nibble
Bit
Local Error Nibble
Local STS Error Codes
The local STS error code nibble contains errors found by local
asynchronous link layer. The following table contains error codes (in hex)
that you may find in the local error code nibble of the STS byte:
This
Code
Means
0
1
2
3
4
Success
No Error
Destination Station Out of Buf
fer Space
Remote Station Specified Does not Acknowledge (ACK) the Command Message
Duplicate T
oken Holder Detected
Local Port Is Disconnected
Local STS Codes 5 through F (hex) are not used.
Where to Find Asynchronous
Link Error Codes
The STS Byte
- Interface Module 1
- Important User Information 2
- Table of Contents 3
- Table of Contentsii 4
- Introduction 5
- Figure 1.1 7
- 1770-KF2 7
- Chapter 1 8
- Specifications 8
- Communication Concepts 13
- Figure 2.1 15
- Highway Network 15
- Figure 2.2 17
- Network Connected to V 17
- Installation 25
- Figure 3.2 28
- Figure 3.5 33
- Dimensions 33
- Chapter 3 39
- Figure 3.10 42
- Diagnostic 42
- (LED) Indicators 42
- Asynchronous Link Protocols 44
- Figure 4.1 47
- Figure 4.3 50
- Software 50
- Implementation of Data Paths 50
- Figure 4.6 52
- Protocol 52
- Environment 52
- Figure 4.7 54
- Logic for Implementing T 54
- Chapter 4 55
- Figure 4.13 62
- Message T 62
- Figure 4.14 67
- Figure 4.15 70
- Figure 4.24 78
- Message Sink Full, Case 2 78
- DLE ENQ STN BCC DLE EOT 79
- Message Packet Formats 80
- Figure 5.1 81
- Chapter 5 87
- Command Packet: 110
- Command Format: 116
- Data Encoding and Addressing 138
- Figure 6.1 139
- Numbers 139
- Figure 6.2 140
- Representation, Number 239 141
- Figure 6.3 141
- Figure 6.4 142
- Hexadecimal 142
- Figure 6.5 143
- 00100000 00000000 146
- First Byte Second Byte 146
- 00110100 00000000 151
- 00 0010100010 152
- 00 0000 0001000110 152
- Error Reporting 156
- Chapter 7 159
- Local Error Codes 164
- EXT STS byte 196
- Switch Settings 197
- Appendix A 198
- Message Formats 200
- (STS, EXT STS) 201
- Detailed Flowcharts 205
- Appendix D 206
- Data Link Layer 228
- Figure E.1 229
- Transition at Master Station 229
- Worldwide representation 235
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