APG MNU Slave Sensor user manual - Manual (Page 10)

MNU Series Ultrasonic Sensors Rev. B1, 5/13
10
Automa! on Products Group, Inc.
APG...Providing tailored solu• ons for measurement applica• ons
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• Sensor Communica! ons
The MNU sensor u! lizes standard Modbus RTU protocol (RS-485). The MNU
sensor can only operate as a slave device. For more informa! on about Modbus
RTU, please visit www.modbus.org.
The MNU sensor will transmit at (allow a minimum delay of 300 ms between
transac! ons):
9600 bps
8 data bits
No parity
1 stop bit
Input Registers (0x04):
Register Returned Data
30300 Raw Distance/Level Reading (in mm, unsigned)
30302 Temperature Reading (in 0 C, signed)
30303-30304 Calculated Reading (in selected units, without decimal place)
NOTE: the Calculated Reading will be returned as a whole number. In order
to a" ain the true result, the Decimal Place se# ng must be taken into ac-
count. Refer to Decimal Place se# ng on page 21 for more informa! on.
Holding Registers (0x03):
Register Func! on Value Range
40400 Device Address 1 to 255
40401 Units 1 to 3
40402 Applica! on Type 0-10
40403 Volume Units 0 to 6
40404 Decimal Place 0 to 3
40405 Max Distance 0 to 10364 mm
40406 Full Distance 0 to 10364 mm
40407 Empty Distance 0 to 10364 mm