Campbell Scientific HMP155A Temperature and Relative Humidity Probe User Manual

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Appendix C. Interfacing with HMP155A RS-485 Output

The public variables for temperature and relative humidity can be viewed in the

‘Numeric Display’ mode as shown below.

For troubleshooting purposes, the serial data buffer in the datalogger can be

viewed using the ‘W’ terminal command. This is done by connecting to the

datalogger from the ‘Connect’ button of LoggerNet or PC400W. From the

Connect screen, select Tools|Terminal Emulator. Click the ‘Open Terminal’

button, and hit the enter key to get the ‘CR1000’ prompt. Type ‘W’ for the

‘Serial Comms Sniffer’. Enter 32 for the SDM-SIO1, and ‘Y’ for ASCII. Raw

serial data received by the buffer is displayed on the screen as shown below.

C-3