Vaisala HMT330 - Manual (Page 207)

Appendix C _________________________________________________________ Modbus Reference
VAISALA _______________________________________________________________________ 205
Code Sub-Function Name Notes
13 (0x0D) Return Bus Exception Error
Count Number of Modbus exception
responses sent
14 (0x0E) Return Slave Message Count Number of Modbus messages
processed
15 (0x0F) Return Slave No Response
Count Number of Modbus messages
received without sending a
response. This happens for
received broadcast messages
(Modbus RTU only) or when
HMT330 is in the “Listen Only”
mode.
Although Modbus Diagnostics are standardized only for serial line
devices, HMT330 supports the same diagnostic functions also on
Modbus TCP.
NOTE Resetting, powering up the transmitter, or reselecting the Modbus mode
(by serial command or with the user interface) resets all Modbus
diagnostic counters and cancels any “Listen Only” mode.
Device Identification Objects
HMT330 Modbus conforms to the extended identification level defined
in the Modbus Application Protocol Specification V1.1b. Both stream
access and individual access to the objects is supported.
Table 47 HMT330 Modbus Device Identification
Object Id Object Name Description
0x00 VendorName “Vaisala”
0x01 ProductCode Product code (e.g. “HMT330”)
0x02 MajorMinorVersion Software version (e.g. “5.10”)
0x03 VendorUrl “http://www.vaisala.com/”
0x04 ProductName Product name of the instrument
0x80 SerialNumber Serial number (e.g. “D0710040”)
0x81 CalibrationDate Date of the last calibration
(e.g. “2011-02-07”, empty if not
available)
0x82 CalibrationText Information text of the last calibration
(empty if not available)