7
TEROS 21
Output
RS232 (TTL) with 3.9-VDC levels or SDI-12 communication protocol
Connector Types
3.5-mm stereo plug connector or stripped and tinned wires
Cable Length
5 m (standard)
75 m (maximum custom cable length)
Data Logger Compatibility
Any data acquisition system capable of 3.9- to 15.0-VDC power and serial or
SDI-12 communication
Supply Voltage (VCC) to GND
Minimum 3.6 VDC
Typical
Maximum 15.0 VDC
Digital Input Voltage (logic high)
Minimum 2.8 V
Typical 3.6 V
Maximum 3.9 V
Digital Input Voltage (logic low)
Minimum –0.3 V
Typical 0.0 V
Maximum 0.8 V
Power Line Slew Rate
Minimum 1.0 V/ms
Typical
Maximum
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