Rotronic HF5 User Manual download pdf (Page 20)

E-M-HF5-V1_25

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF5 Humidity Temperature

Transmitters: User Guide

Instruction Manual

Document Type

Page

20 of 30

Document title

6.4.3 HF55: digital output

Connectors and terminal block diagram

Notes:

Terminal K1-3: this terminal (protective or earth ground) is not tied with GND. If so desired, K1-3 can be tied

with GND by closing a solder pad on the PCB

Terminal block K3 (RS-485): with the exception of models with the galvanically isolated power supply option,

terminals K3-1 and K3-2 can be used to power the HF55 from a 15 to 24 VDC power supply connected to the

RS-485 main data line. In this case, do not use terminals K1-1 and pin K1-2 (normally used to power the

HF55).

WARNING: Connecting a device to an active Ethernet network can disrupt communications on the network.

Before connecting the HF5, make sure that it is properly configured for your network.

6.4.4 Grounding (all models)

We generally recommend grounding the (-) side of the power supply, especially if the electronics will be

subjected to a low humidity environment (35 %RH or less).

Terminals

Description

K1-1: GND

Power supply (-) or neutral

(tied with other GND)

K1-2: V+

Power supply: 5…40 VDC (+)

or 12…28 VAC (Phase)

K1-3: -►

Protective ground (see note below)

Terminals

Description

K3-4: D-

RS-485 Bi-directional

TX- / RX -

K3-3: D+

RS-485 Bi-directional

TX+ / RX +

K3-2: GND

Ground / Power supply (-)

K3-1: PWR

DC (+) 15…24 VDC (+)

(optional, see note below)

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Rotronic HF5 User Manual Page 20

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