490Sensors (Probes)
© Tibbo Technology Inc.
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Each Bus Probe has a detachable terminal block with four terminals: ground (GND),
power (+V), as well as RS485+ and RS485- lines of the RS485 signal pair.
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Communications parameters of the RS485 port are 38400-8-N-1.
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When using an RS485 bus of substantial length, do not forget to add 120 Ohm
termination resistors on both ends of the bus.
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The MD button* has two uses:
o For enabling writes into protected Modbus registers of Bus Probes;
o For entering the firmware update mode of the Monitor/Loader.
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Status LEDs display a number of device states and errors.
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Mounting holes can be used to attach Probes to flat surfaces.
* Each Bus Probe comes with a metal pin that makes pushing and holding down the
MD button easier.
Modbus Registers of Bus Probes
This topic lists Modbus registers found on Tibbo Bus Probes.
Common registers
These registers are present on all Bus Probes.
Device ID (Modbus address). This ID must be
between 1 to 247. Attempts to set an ID outside
of this range will be ignored.
Default 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).
Probe type:
1 – BP#01 (ambient temperature sensor);
2 – BP#02 (ambient temperature and humidity
sensor);
3 – BP#03 (ambient light sensor);
4 – BP#04 (3-axis acceleration sensor).
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