Baumer OM20 - Measured Value and Additional Information

Baumer Commissioning | 7
OM20/ OM30 RS485 with Modbus RTU | V1 Operating Manual 23
The following data (hexadecimal) is read out for the distance value:
n
202 = 7C37
n
203 = 428B
The distance value is divided between 2 Modbus registers (Little Endian). Thus, the less signifi-
cant bits are located at the smaller address, in this case 202. The more significant bits are lo-
cated at the larger address, in this case 203. The distance value must therefore be evaluated as
42 8B 7C 37. This results in a distance of 69.743mm.
7.3 Measured value and additional information
The measured value and additional information can be called up by calling up the input register
with the address 200.
Modbus RTU command – input register: measured value and additional information
Address 200 – All Measurement Values:
Address Access
Number of
registers Data type Description
200 Read 1 unit16_t Measured value signal quality:
n
0 = ok
n
1 = weak signal
n
2 = critical signal
201 Read 1 unit16_t Bit 0: switching output:
n
0 = inactive
n
1 = active
Bit 1: alarm output
n
0 = inactive
n
1 = active
202 - 203 Read 2 float32_t Distance [mm]
204 - 205 Read 2 float32_t Measurement rate [Hz]
206 Read 1 unit16_t Exposure reserve
207 - 208 Read 2 unit32_t Response delay [µs]
209 - 210 Read 2 unit32_t Time stamp [s]
211 - 212 Read 2 unit32_t Time stamp [µs]
INFO
The distance value in address 202 and 203 can also be read individually. For this, read out reg-
ister 202 with register number 2. A single readout of the distance can reduce the transmission
time.