Manual

IN-E-HL-NT-V2_12

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroLog HL-NT data logger:

instruction manual

Instruction Manual

Document Type

Page

26 of 48

Document title

3.4 Relay contacts

Docking station model HL-DS-R1 features two independent relays, each with 3 contacts: normally

closed, normally open and common. When configuring the HygroLog HL-NT and docking station

with the HW4 software, a number of conditions can be defined that will cause the relay to be

either energized or de-energized.

The relays of the HL-DS-R1 docking station can be used to provide a local indication of the

following:

o Out of limit values for probe inputs 1 to 3 of the HygroLog HL-NT

o Status of the two logical inputs of the DS-R-1 docking station

o Memory card error

o External power failure

o Low battery charge

4. Pin-out diagrams

Note: all pin-out diagrams are shown from the solder side of the matching connector

HygroLog HL-NT2 and HL-NT3: the probe inputs are always configured for a HygroClip 2

probe

Docking stations HL-DS-U1, HLDS--U2, HL-DS-U4, HL-DS-U4-420 and HL-DS-U4-WL:

the probe inputs can be configured for either a HygroClip 2 probe or for a 1-channel analog

probe

HygroClip 2 probe

1: RXD (UART)

2: GND (digital and power)

3: V+ (nominal 3.3 VDC)

4: not used

5: not used

6: not used

7: TXD (UART)

Analog 1-channel probe

1: not used

2: GND (analog and power)

3: V+ (nominal 5 VDC, maximum 10 mA)

4: not used

5: not used

6: analog signal (0.0…3.3 VDC or 4…20 mA

7: not used