APG MNU Slave Sensor user manual User 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
Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • [email protected]
• 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