Watlow CLS200, MLS300 and CAS200 User Manual Page 39
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Chapter 2: Modbus-RTU Protocol
Communications Specification 33
Sample Packet for Host Transmission, a Multipoint Write
The data must be written to sequential locations.
Helpful hint: The string is longer for multiple write; checking the
BYTE COUNT can help in determining if a command timeout is valid.
Example 6: Writing TI loops 3 (100) and 4 (150), controller
10.
Sample Packet for Slave Transmission, a multipoint write.
Modbus-RTU Data Table Summary
Each addressable register holds two bytes of data. Each parameter value
requires only one register to store any of these types of data. The data
type for each parameter is indicated in the tables on the following pages.
Because each loop is individually configurable, the number of instances
of many parameters depends on the number of loops in the controller.
Therefore, the number of registers for these parameters is listed in the
tables on the following pages in terms of the number of loops in the
controller.
Slave
Address
in Hex
Function
in Hex
Address
High
in Hex
Address
Low
in Hex
Number
of
Registers
High
in Hex
Number
of
Registers
Low
in Hex
Byte
Count
in Hex
Data
in Hex
CRC
High
in
Hex
CRC
Low
in Hex
0A 10 00 86 00 02 04 00 64 00 96 9F 70
Slave
Address
in Hex
Function
in Hex
Address
High
in Hex
Address
Low
in Hex
Number
of
Registers
High
in Hex
Number of
Registers
Low
in Hex
CRC
High
in Hex
CRC
Low
in
Hex
0A 10 00 86 00 02 A1 5A
Data Type and Symbol Data Size
Unsigned char (UC) 1 byte
Signed char (SC) 1 byte
Unsigned int (UI) 2 bytes
Signed int (SI) 2 bytes
- 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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