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Chapter 5 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 51
Modbus Communication
Addressing with Modbus Protocol
The Modbus variant used in DPT146 communication is Modbus RTU.
An example of Modbus addressing is shown below.
Request:
0x01
0x03
0x00
0x04
0x00
0x02
0x85
0xCA
addr.
func.
reg. 5
2 registers
CRC check
Response:
0x01
0x03
0x04
0xBC
0xC0
0x41
0xC2
0x6E
0x5E
addr.
func.
len.
reg. 5
reg. 6
CRC check
For a list of available Modbus registers, see Appendix A Modbus
Reference on page 66.
Accessing Serial Port Command Interface from
Modbus Mode
You cannot change configuration settings (other than Modbus address)
while the device is in the Modbus mode. To use the configuration
commands on a Modbus-enabled device:
1. Connect the USB service cable to the PC and install the driver, if
necessary.
2. Open the terminal program and open a connection to the
corresponding COM port using settings 19200, 8, N, 1, no flow
control.
3. Plug the service cable to the connector II of the instrument.
4. In less than five seconds, send a hash character (#) and carriage
return (Enter) to the device using the terminal program. The device
is now ready for configuration commands. The Modbus mode is
restored on next power-up unless Modbus is disabled with
command SMODE.
For example, if you want to deactivate the Modbus mode on a DPT146
device, follow the procedure above and deactivate the Modbus mode
with command SMODE STOP. On subsequent power-ups, the serial
command interface will be activated.
- USER'S GUIDE 1
- CHAPTER 5 4
- CHAPTER 6 5
- CHAPTER 7 5
- CHAPTER 8 5
- APPENDIX A 5
- List of Figures 6
- List of Tables 7
- GENERAL INFORMATION 9
- Version Information 10
- Related Manuals 10
- Documentation Conventions 10
- ESD Protection 11
- Recycling 12
- Regulatory Compliances 12
- Patent Notice 12
- Trademarks 12
- Software License 13
- Warranty 13
- PRODUCT OVERVIEW 14
- 1109-029 15
- Connection Cables 17
- 1102-053 18
- DRYCAP® Technology 20
- BAROCAP® Technology 21
- DPT146 Startup Sequence 22
- INSTALLATION 23
- Installing the Transmitter 24
- CAUTION 25
- Sampling from a Process 27
- Sampling Accessories 27
- Connector and Leak Screw 28
- 0507-105 29
- 0510-032 30
- 0510-033 30
- 0403-113 32
- OPERATION 34
- Serial Communication 35
- 0807-004 37
- Device Information 39
- Show Currently Active Errors 40
- Show Command List 40
- Configuring Analog Output 41
- Scaling 42
- Extend Analog Output Range 43
- Serial Line Output Commands 44
- Stop Measurement Output 45
- Set Output Interval 45
- Output a Reading Once 46
- Select Unit 49
- Set Serial Line Settings 50
- Set Transmitter Address 50
- Other Commands 51
- Show Transmitter Uptime 52
- Reset Transmitter 52
- Restore Factory Settings 52
- Modbus Communication 53
- MAINTENANCE 55
- 1109-001 56
- 1109-002 56
- 1108-039 58
- TROUBLESHOOTING 60
- Error Messages 61
- Unknown Serial Settings 61
- Technical Support 62
- Product Returns 62
- TECHNICAL DATA 63
- Dewpoint t 64
- Table 18 General 65
- Spare Parts and Accessories 66
- Dimensions in mm 67
- MODBUS REFERENCE 68
- Modbus Register Map 69
- *M211372EN* 71
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