Watlow CLS200, MLS300 and CAS200 User Manual Page 34
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28 Communications Specification
Chapter 2: Modbus-RTU Protocol
response is returned. This function is the only one that
brings the port out of Listen Only Mode. If the port is not
currently in Listen Only Mode, a normal response is
returned. This occurs before the restart is executed.
Subfunction Data Field (Query) Data Field (Response)
x00 01 x00 00 Echo Query Data
x00 01 xFF 00 Echo Query Data
x02 Return Diagnostic Register
• The contents of the slave’s 16-bit diagnostic register are
returned in the response.
Subfunction Data Field (Query) Data Field (Response)
x00 02 x00 00 Diagnostic Register
Contents
x04 Force Listen Only Mode
• Forces the addressed slave to its Listen Only Mode for
Modbus-RTU communications. This isolates it from the
other devices on the network, allowing them to continue
communicating without interruption from the addressed
slave. No response is returned.
• When the slave enters its Listen Only Mode, all active com-
munication controls are turned off. The ready watchdog
timer is allowed to expire, locking the controls off. While in
this mode, any Modbus-RTU messages addressed to the
salve or broadcast are monitored, but no actions will be
taken and no responses will be sent.
• The only function that will be processed after the mode is
entered will be the Restart Communications Option func-
tion (function code 8, subfunction 1).
Subfunction Data Field (Query) Data Field (Response)
x00 04 x00 00 No Response
Returned
x0A Clear Counters
• Clears all Communication Event counters. Counters are
also cleared upon power-up.
Subfunction Data Field (Query) Data Field (Response)
x00 0A x00 00 Echo Query Data
x0B Return Bus Message Count
• The response data field returns the quantity of messages that
the slave has detected on the communications system since
its last restart, clear counters operations, or power-up.
Subfunction Data Field (Query) Data Field (Response)
x00 0B x00 00 Total Message Count
x0C Return Bus Communication Error Count
• The response data field returns the quantity of CRC errors
encountered by the slave since its last restart, clear counters
- CLS200, MLS300 1
- Communications 1
- Specification 1
- Warranty 2
- Contents 3
- Protocol Syntax 9
- Transaction Sequence 10
- Packet Format 12
- Codes in a Packet 12
- Error Checking 14
- Cyclic Redundancy Check (CRC) 15
- Examples 16
- Block Write 19
- Message Data 20
- Data for a Write Command 21
- Two-Byte Data Types 21
- Figuring Block Size 21
- Anafaze/AB Data Table Summary 22
- Number Description 24
- Address 24
- Type Number of Bytes 24
- Overview 27
- The Query-Response Cycle 28
- Serial Transmission 28
- Message Framing 29
- Contents of the Data Field 30
- CRC Error Checking 31
- Function Codes 32
- Diagnostic Subfunctions 33
- Writing Data 36
- Reading Data 36
- Write Examples 38
- Modbus-RTU Data Table Summary 39
- Chapter 3: 45
- All Units 17, 18 47
- Enhanced Features options 49
- Parameters (by number) 51
- Input Type (3) 52
- Output Type (4) 53
- Setpoint (5) 54
- Process Variable (6) 54
- Output Filter (7) 54
- Output Value (8) 55
- Alarm Deadband (12) 55
- Alarm_Status (13) 56
- Ambient Sensor Readings (15) 58
- Pulse Sample Time (16) 58
- High Process Variable (17) 58
- Low Process Variable (18) 58
- Precision (19) 59
- Cycle Time (20) 60
- Zero Calibration (21) 60
- Full Scale Calibration (22) 60
- Digital Inputs (25) 60
- Digital Outputs (26) 61
- Override Digital Input (28) 61
- Override Polarity (29) 61
- System Status (30) 62
- System Command Register (31) 62
- Data Changed Register (32) 63
- Input Units (33) 63
- EPROM Version Code (34) 64
- Options Register (35) 64
- High Reading (37) 65
- Low Reading (38) 65
- Heat/Cool Spread (39) 65
- Startup Alarm Delay (40) 66
- • Range: See tables below 67
- • Default: 0 67
- Current Segment (47) 68
- Segment Time Remaining (48) 68
- Current Cycle Number (49) 68
- Tolerance Alarm Time (50) 68
- Last Segment (51) 68
- Number of Cycles (52) 69
- Ready Setpoint (53) 69
- Ready Event States (54) 69
- Segment Setpoint (55) 70
- Segment Time (58) 72
- Tolerance (59) 72
- Ramp/Soak Flags (60) 72
- Output Limit (61) 73
- Output Limit Time (62) 73
- Alarm_Control (63) 74
- Alarm_Acknowledge (64) 74
- Alarm_Mask (65) 74
- Alarm_Enable (66) 74
- AIM Fail Output (68) 75
- Output Linearity Curve (69) 76
- SDAC Mode (70) 76
- SDAC Low Value (71) 76
- SDAC High Value (72) 76
- Save Setup to Job (73) 77
- Input Filter (74) 77
- Loop Alarm Delay (75) 77
- Loop Names (77) 77
- Channel Name (78) 78
- Manufacturing Test (80) 78
- Cascade Maximum Setpoint (89) 80
- Cascade Base Setpoint (87) 80
- Cascade Minimum Setpoint (88) 80
- Loop Status (96) 82
- Output Type/Disable (97) 82
- Output Reverse/Direct (98) 82
- Controller Type (99) 83
- Ramp/Soak Profile Number (100) 83
- Controller Address (101) 83
- Baud Rate (102) 83
- Ready Events (103) 84
- Appendix A: 85
- Communications Driver 85
- Close_Comm_Port() 86
- DownLoad() 86
- UpLoad() 87
- Glossary 89
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