5.1 Overview of the OTT netDL IP datalogger
Sensor inputs
RS-485 interface (e.g. OTT RLS radar sensor, OTT Sonicflow, third-party sen-
sors providing Modbus communication protocol)
RS-232 interface (OTT protocol, e.g. Nimbus bubble sensor) *
SDI-12 interface (e.g. Hydrolab DataSonde DS5, Hydrolab MiniSonde MS5)
Pulse input
Status input (2 x 1 bit)
0-50 mV, 0-1.25 V, 0-5 V, 0-10 V voltage input *
(0) 4-20 mA input (current loop) *
Pt 100 (temperature sensor) *
5 kOhm potentiometer *
Supply voltage (internal)
Monitoring switching output
Monitoring status output
Monitoring 4 … 20 mA output
* only with analog/RS-232 expansion
Communication interfaces
RS-232 interface
USB host interface
USB device interface
Ethernet interface (OTT netDL 1000)
Communication protocols
OTT protocol
Modbus
SDI-12 (native and "SDI-12 via RS-485")
OTT HDR / OTT HDR 1200 (satellite communication)
CREX code (satellite communication)
Terminal mode
OTT-SDI Transparent mode
FTP (File Transfer Protocol)
SMTP (Simple Mail Transfer Protocol)
HTTP GET / HTTP POST (Hypertext Transfer Protocol)
HTTPS (Hypertext Transfer Protocol Secure)
Socket (Stream or datagram socket)
Outputs
Potential-free switching output (with output card)
Voltage output for supply of sensors (switched U
bat
)
The outputs switch e.g. modem, sensor supply, or alarm devices
(potential-free switching output via relay).
4 … 20 mA output
Measured value processing
Sample interval; internal/external
Mean calculation
Totals formation
Scaling "ax + b"
Two-point scaling
Delta storage
Definition of a sensor delay time
Extreme value collection (minimum/maximum)
Filter functions
12
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