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Sensors (Probes)
© Tibbo Technology Inc.
Setting Up and Testing Bus Probes
Perhaps the most convenient way of managing and testing the Bus Probes is by
using a TPS2(G2) system running one of our Bus Probe testing apps:
·
BP-Tester-UI
— allows you to test and manage the Probes. Offers an LCD- and
keypad-based user interface. You can find this app and its description here:
http://tibbo.com/programmable/applications/sensors/bp-tester-ui.html
·
BP-Tester-Web
— offers the same functionality, but relies on a web interface for
interacting with a user. You can find this app and its description here:
http://tibbo.com/programmable/applications/sensors/bp-tester-web.html
Both apps allow you to:
·
Scan for Probes connected to a RS485 port of the TPS2 system;
·
of Bus Probes;
·
Poll the Probes for data and display it on the LCD screen (or web page);
·
Setting Modbus IDs
Like all Modbus devices, Bus Probes connected to the same RS485 bus must be
assigned unique Modbus IDs.
Modbus ID of each probe is stored in its
. IDs must be in the range
between 1 and 247. Attempts to set a value outside of this range will be ignored.
Perhaps the most convenient way of setting the IDs of Bus Probes is by using a
TPS2(G2) system running one of the two
provided by Tibbo.
Alternatively, you can use any suitable Modbus software to write a new value into
the ID register. Since personal computers do not come equipped with RS485 ports,
you will need to procure a USB-to-RS485 cable. We successfully tested DigiFusion
"FTDI-based" USB-to-RS485 cable. You will also need a DC power source to power
the Probes (5~12V voltage range recommended).
It is only possible to alter the ID register when the
Therefore, you must press and hold the MD button when sending the write command
to your Bus Probe.
* Note: each Bus Probe comes with a metal pin that makes pushing and holding
down the MD button easier.
Default Modbus IDs
Default Modbus ID of a Probe depends on the Probe's type:
·
0x40
for BP#01 (ambient temperature sensor);
·
0x41
for BP#02 (relative humidity and temperature sensor);
·
0x42
for BP#03 (ambient light sensor);
·
0x43
for BP#04 (3-axis accelerometer).